MANT / Mantech International Corp - Class A - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Mantech International Corp - Class A
US ˙ NASDAQ ˙ US5645631046
HINDI NA ACTIVE ANG SIMBONG ITO

Mga Batayang Estadistika
LEI 5299007N03CAU4SWNR02
CIK 892537
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Mantech International Corp - Class A
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
February 10, 2023 SC 13G/A

MANT / Mantech International Corp / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 8 )* ManTech International Corp/VA (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropri

September 28, 2022 15-12G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 000-49604 ManTech International Corporation (Exact name of registrant as spe

September 15, 2022 S-8 POS

As filed with the Securities and Exchange Commission on September 15, 2022

As filed with the Securities and Exchange Commission on September 15, 2022 Registration No.

September 15, 2022 S-8 POS

As filed with the Securities and Exchange Commission on September 15, 2022

As filed with the Securities and Exchange Commission on September 15, 2022 Registration No.

September 14, 2022 8-K

Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Termination of a Material Definitive Agreement, Material Modification to Rights of Security Holders, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 14, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation

September 14, 2022 EX-3.1

Fourth Amended and Restated Certificate of Incorporation of ManTech International Corporation.

Exhibit 3.1 FOURTH AMENDED & RESTATED CERTIFICATE OF INCORPORATION OF MANTECH INTERNATIONAL CORPORATION FIRST: The name of the Corporation is: ManTech International Corporation SECOND: The address of the registered office of the Corporation in the State of Delaware is Corporation Trust Center, 1209 Orange Street, Wilmington, New Castle County, Delaware 19801. The name of the Corporation?s register

September 14, 2022 EX-3.2

Fourth Amended and Restated Bylaws of ManTech International Corporation.

Exhibit 3.2 FOURTH AMENDED AND RESTATED BYLAWS OF MANTECH INTERNATIONAL CORPORATION ARTICLE I. OFFICES Section 1. Registered Office. The registered office of ManTech International Corporation, a Delaware corporation (the ?Corporation?), shall be in the City of Wilmington, County of New Castle, State of Delaware. Section 2. Other Offices. The Corporation may also have offices at such other places b

September 14, 2022 EX-99.1

ManTech Announces Completion of Acquisition by Carlyle

Exhibit 99.1 ManTech Announces Completion of Acquisition by Carlyle HERNDON, Va., Sept. 14, 2022 ? ManTech International Corporation (Nasdaq: MANT) (?ManTech? or the ?Company?), a leading provider of innovative technologies and solutions for mission-critical national security programs, today announced the completion of its sale to funds managed by global investment firm Carlyle (NASDAQ: CG) in an

September 8, 2022 8-K

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 7, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

September 8, 2022 EX-99.1

ManTech Stockholders Approve Acquisition by Carlyle

Exhibit 99.1 ManTech Stockholders Approve Acquisition by Carlyle HERNDON, Va., Sept. 07, 2022 ? ManTech International Corporation (Nasdaq: MANT) (?ManTech? or the ?Company?), a leading provider of innovative technologies and solutions for mission-critical national security programs, today announced that its stockholders approved a proposal to adopt the merger agreement entered into between the Com

August 29, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

August 29, 2022 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 29, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (

August 5, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

August 4, 2022 DEFM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

August 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Intern

July 7, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

July 1, 2022 EX-FILING FEES

CALCULATION OF FILING FEE TABLES Schedule 14A (Form Type) ManTech International Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Proposed Maximum Aggregate Value of Transaction Fee rate Amount of Filin

Exhibit 107 CALCULATION OF FILING FEE TABLES Schedule 14A (Form Type) ManTech International Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Proposed Maximum Aggregate Value of Transaction Fee rate Amount of Filing Fee Fees to be Paid $ 3,994,114,947(1)(2) 0.

July 1, 2022 PREM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

June 21, 2022 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 20, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

June 21, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 20, 2022 ManTech Internation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 20, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

June 15, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 10, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

May 17, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 12, 2022 ManTech Internationa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 12, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Com

May 17, 2022 EX-10.1

Form of Amendment to Executive Continuity and Stay Incentive Agreement

Exhibit 10.1 [DATE] [NAME] Re: [FORM OF] Amendment to Executive Continuity and Stay Incentive Agreement Dear [NAME]: Reference is made to your Executive Continuity and Stay Incentive Agreement with ManTech International Corporation (the ?Company?), dated [DATE] (your ?ECSI?). As you know, George Pedersen has fully retired from the Company and has also recently resigned from the Company?s Board of

May 17, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 12, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Com

May 16, 2022 EX-99.2

Carlyle to Acquire ManTech in All-Cash Transaction Valued at Approximately $4.2 Billion ManTech shareholders to receive $96.00 in cash per share

Exhibit 99.2 Carlyle to Acquire ManTech in All-Cash Transaction Valued at Approximately $4.2 Billion ManTech shareholders to receive $96.00 in cash per share HERNDON, Va., May 16, 2022 ? ManTech International Corporation (Nasdaq: MANT) (?ManTech? or the ?Company?), a leading provider of innovative technologies and solutions for mission-critical national security programs, today announced that it h

May 16, 2022 EX-99.1

VOTING AGREEMENT

Exhibit 99.1 VOTING AGREEMENT VOTING AGREEMENT, dated as of May 13, 2022 (this ?Voting Agreement?), among Moose Bidco, Inc. (?Parent?), and the stockholders of ManTech International Corporation, a Delaware corporation (the ?Company?), listed on the signature pages hereto (each, a ?Stockholder? and, collectively, the ?Stockholders?). W I T N E S S E T H : WHEREAS, concurrently with the execution an

May 16, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

May 16, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 13, 2022 ManTech Internationa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 13, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Com

May 16, 2022 EX-2.1

Agreement and Plan of Merger, dated as of May 13, 2022, by and among Moose Bidco, Inc., Moose Merger Sub, Inc. and ManTech International Corporation.*

Exhibit 2.1 Execution Version AGREEMENT AND PLAN OF MERGER by and among MOOSE BIDCO, INC., MOOSE MERGER SUB, INC., and MANTECH INTERNATIONAL CORPORATION Dated as of May 13, 2022 TABLE OF CONTENTS Page ARTICLE I THE MERGER Section 1.1 The Merger 2 Section 1.2 Effective Time 2 Section 1.3 Closing 2 Section 1.4 Effect of the Merger 3 Section 1.5 Certificate of Incorporation and Bylaws 3 Section 1.6 S

May 16, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 13, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Com

May 5, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Inter

May 4, 2022 EX-99.1

ManTech Announces Financial Results for First Quarter of 2022

Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2022 ?Revenue: $676 million, up 6.7% from the first quarter of 2022 ?EBITDA Margin: 9.7% ?Diluted EPS: $0.76 ?Adjusted Diluted EPS: $0.89 ?Cash Flow from Operations: $34 million ?Bookings of $464 million resulting in a book-to-bill ratio of 0.7 ?Reiterates 2022 guidance on all measures HERNDON, Va., May 4, 2022 (GLOBE NEWSWIRE)

May 4, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 4, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Comm

April 29, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14

April 8, 2022 SC 13G

MANT / Mantech International Corp / Warren Jennifer A. - SC 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c) and (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No.

March 31, 2022 SC 13G/A

MANT / Mantech International Corp / PEDERSEN GEORGE J - SC 13G/A Passive Investment

SC 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c) and (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No.

February 25, 2022 EX-21.1

Subsidiaries of the Registrant.

EXHIBIT 21.1 Subsidiaries of the Registrant The significant subsidiaries of the Registrant, as defined in Section 1-02(w) of regulation S-X, are: ManTech Advanced Systems International, Inc. ManTech SRS Technologies, Inc. Edaptive Systems LLC Knowledge Consulting Group, Inc. Gryphon Finance, LLC

February 25, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech International Corpora

February 24, 2022 EX-10.1

ManTech International Corporation 2022 Executive Incentive Compensation Plan

Exhibit 10.1 MANTECH INTERNATIONAL CORPORATION 2022 EXECUTIVE INCENTIVE COMPENSATION PLAN 1.0 OVERVIEW ManTech International Corporation (Company) has established this 2022 Executive Incentive Compensation Plan (Plan) to help attract, retain, and motivate our executives to achieve certain goals and objectives. Incentive compensation is an integral part of the Company?s compensation program. This P

February 24, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 22, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

February 23, 2022 EX-99.1

ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2021

Exhibit 99.1 ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2021 ?Revenue: $634 million for the fourth quarter and $2.55 billion for the year ?EBITDA Margin: 9.8% for the fourth quarter and 10.3% for the year ?Diluted EPS: $0.73 for the fourth quarter and $3.35 for the year ?Adjusted Diluted EPS: $0.83 for the fourth quarter and $3.71 for the year ?Book-to-Bill Ratio: 0.9 f

February 23, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 21, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

February 23, 2022 EX-99.1

George Pedersen Retires from ManTech Board of Directors

Exhibit 99.1 George Pedersen Retires from ManTech Board of Directors HERNDON, Va., February 23, 2022 (GLOBE NEWSWIRE) ? ManTech (Nasdaq: MANT) today announced that its Co-Founder, George J. Pedersen, has decided to retire from his positions on the ManTech Board of Directors and as Chairman Emeritus. ?Over the past several years, ManTech has undertaken a multi-year plan to transition leadership of

February 23, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2022 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

February 10, 2022 SC 13G/A

MANT / Mantech International Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: ManTech International Corp./VA Class A Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this

February 8, 2022 SC 13G/A

MANT / Mantech International Corp / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 7 )* ManTech International Corp/VA (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

February 8, 2022 SC 13G/A

MANT / Mantech International Corp / PEDERSEN GEORGE J - SC 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c) and (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No.

December 7, 2021 SC 13G/A

MANT / Mantech International Corp / JPMORGAN CHASE & CO - FILING MANTECH INTERNATIONAL CORPORATION Passive Investment

Schedule 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 01)* ManTech International Corporation (Name of Issuer) Class A Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) November 30, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate

November 3, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech I

November 2, 2021 EX-99.1

ManTech Announces Financial Results for Third Quarter of 2021

Exhibit 99.1 ManTech Announces Financial Results for Third Quarter of 2021 ?Revenue: $638 million ?EBITDA Margin: 11.4% ?Diluted EPS: $0.93, up 27% from the third quarter of 2020 ?Adjusted Diluted EPS: $1.01, up 22% from the third quarter of 2020 ?Cash Flow from Operations: $139 million (3.6 times Net Income) ?Bookings of $716 million resulting in a book-to-bill ratio of 1.1 ?Gryphon Technologies

November 2, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2021 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

November 1, 2021 EX-99.1

ManTech to Acquire Gryphon Technologies Acquisition Expands Advanced Digital Engineering Capabilities Across the Department of Defense

Exhibit 99.1 ManTech to Acquire Gryphon Technologies Acquisition Expands Advanced Digital Engineering Capabilities Across the Department of Defense HERNDON, VA, NOVEMBER 1, 2021 ? ManTech International Corporation (Nasdaq: MANT) announced today that it has signed a definitive agreement to acquire Gryphon Technologies, a leading systems engineering firm, from AE Industrial Partners, for $350 millio

November 1, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 29, 2021 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

August 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Intern

August 3, 2021 EX-99.1

ManTech Announces Financial Results for Second Quarter of 2021

Exhibit 99.1 ManTech Announces Financial Results for Second Quarter of 2021 ?Revenue: $649 million, up 3% from the second quarter of 2020 ?EBITDA Margin: 10.4% ?Diluted EPS: $0.89, up 20% from the second quarter of 2020 ?Adjusted Diluted EPS: $0.99, up 18% from the second quarter of 2020 ?Bookings of $813 million resulting in a book-to-bill ratio of 1.3 HERNDON, Va., August 3, 2021 (GLOBE NEWSWIRE

August 3, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2021 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (C

July 20, 2021 EX-10.1

Third Amended and Restated Credit Agreement, by and among the Company and a syndicate of lenders, including Bank of America, N.A., acting as administrative agent for the lenders, dated as of July 20, 2021 (incorporated herein by reference from registrant's Current Report on Form 8-K, as filed with the SEC on July 20, 2021).

Exhibit 10.1 EXECUTION VERSION Published CUSIP Number: 56456CAJ3 Published Revolving Credit Facility CUSIP Number: 56456CAL8 Published Term Facility CUSIP Number: 56456CAK0 THIRD AMENDED AND RESTATED CREDIT AGREEMENT Dated as of July 20, 2021 among MANTECH INTERNATIONAL CORPORATION, as the Borrower, BANK OF AMERICA, N.A., as Administrative Agent and L/C Issuer, PNC BANK, NATIONAL ASSOCIATION, as S

July 20, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 20, 2021 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

May 26, 2021 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2021 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Com

May 5, 2021 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Inter

May 4, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 4, 2021 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Comm

May 4, 2021 EX-99.1

ManTech Announces Financial Results for First Quarter of 2021

Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2021 ?Revenue: $633 million, up 4% from the first quarter of 2020 ?EBITDA Margin: 9.7% ?Diluted EPS: $0.79, up 11% from the first quarter of 2020 ?Adjusted Diluted EPS: $0.88, up 9% from the first quarter of 2020 ?Bookings of $561 million resulting in a book-to-bill ratio of 0.9 ?Reiterates 2021 guidance on all measures HERNDON,

April 16, 2021 DEF 14A

- DEF 14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Schedule 14(a) of the Securities Exchange Act of 1934 (Amendment No.) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitte

March 12, 2021 EX-10.2

ManTech International Corporation 2021 Executive Incentive Compensation Plan

Exhibit 10.2 MANTECH INTERNATIONAL CORPORATION 2021 EXECUTIVE INCENTIVE COMPENSATION PLAN 1.0 OVERVIEW ManTech International Corporation (Company) has established this 2021 Executive Incentive Compensation Plan (Plan) to help attract, retain, and motivate our executives to achieve certain goals and objectives. Incentive compensation is an integral part of the Company?s compensation program. This P

March 12, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 9, 2021 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other Jurisdiction of Incorporation) (Co

February 19, 2021 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech International Corpora

February 19, 2021 EX-21.1

Subsidiaries of the Registrant.

EXHIBIT 21.1 Subsidiaries of the Registrant The significant subsidiaries of the Registrant, as defined in Section 1-02(w) of regulation S-X, are: ManTech Advanced Systems International, Inc. ManTech SRS Technologies, Inc. Edaptive Systems LLC Knowledge Consulting Group, Inc.

February 17, 2021 EX-99.1

ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2020

Exhibit 99.1 ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2020 ?Revenue: $639 million for the fourth quarter and $2.52 billion for the year (11% organic growth) ?EBITDA Margin: 9.3% for the fourth quarter and 9.1% for the year ?Diluted EPS: $0.79 for the fourth quarter and $2.97 for the year ?Adjusted Diluted EPS: $0.89 for the fourth quarter and $3.36 for the year ?Book-

February 17, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 17, 2021 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

February 12, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c) and (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 7)* Man

SC 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c) and (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No.

February 12, 2021 SC 13G/A

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6 )* ManTech International Corp/VA (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: ManTech International Corp./VA Class A Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this S

January 13, 2021 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* ManTech International Corporation (Name of Issuer) Class A Common Stock (Title of Class of Securities) (C

Schedule 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* ManTech International Corporation (Name of Issuer) Class A Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate t

December 11, 2020 CORRESP

Via EDGAR Submission December 11, 2020 Angela Lumley Office of Trade & Services Division of Corporation Finance United States Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549 Re: ManTech International Corporation Form 10-K

Via EDGAR Submission December 11, 2020 Angela Lumley Office of Trade & Services Division of Corporation Finance United States Securities and Exchange Commission 100 F Street, N.

December 3, 2020 CORRESP

December 3, 2020 Ms. Angela Lumley Division of Corporate Finance Securities and Exchange Commission Washington, D.C. 20549 Re: REQUEST FOR EXTENSION OF TIME TO RESPOND TO COMMENT LETTER DATED 11/6/2020 File No. 000-49604 Dear Ms. Lumley: We are writi

December 3, 2020 Ms. Angela Lumley Division of Corporate Finance Securities and Exchange Commission Washington, D.C. 20549 Re: REQUEST FOR EXTENSION OF TIME TO RESPOND TO COMMENT LETTER DATED 11/6/2020 File No. 000-49604 Dear Ms. Lumley: We are writing in response to the letter from the Securities and Exchange Commission (the ?Commission?) dated November 6, 2020 (the ?Comment Letter?) in which the

November 6, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech I

November 5, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 5, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

November 5, 2020 EX-99.1

ManTech Announces Financial Results for Third Quarter of 2020

Exhibit 99.1 ManTech Announces Financial Results for Third Quarter of 2020 • Revenue: $636 million, up 10% from the third quarter of 2019 • EBITDA Margin: 9.0% • Diluted EPS: $0.73, up 6% from the third quarter of 2019 • Adjusted Diluted EPS: $0.83, up 6% from the third quarter of 2019 • Bookings of $1.3 billion resulting in a book-to-bill ratio of 2.1 • Cash Flow from Operations: $112 million • R

September 3, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 31, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (

September 3, 2020 EX-99.1

George Pedersen Transitions to Chairman Emeritus; ManTech Board of Directors Elects Kevin Phillips as Chairman of the Board

EX-99.1 Exhibit 99.1 George Pedersen Transitions to Chairman Emeritus; ManTech Board of Directors Elects Kevin Phillips as Chairman of the Board HERNDON, Va., September 3, 2020 (GLOBE NEWSWIRE) – ManTech (Nasdaq: MANT) announced today that its co-founder, George J. Pedersen, has decided to transition from his role as Executive Chairman and Chairman of the Board. Pedersen will remain a member of th

August 3, 2020 EX-10.1

Form of Indemnification Agreement

EX-10.1 Exhibit 10.1 FORM OF INDEMNIFICATION AGREEMENT This INDEMNIFICATION AGREEMENT (the “Agreement”) is made and entered into as of , 2020, by and between ManTech International Corporation, a Delaware corporation (the “Company”), and (“Indemnitee”). RECITALS: A. The Company recognizes the continued difficulty in obtaining liability insurance for its directors, officers, employees, controlling p

August 3, 2020 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 28, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

July 31, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Intern

July 29, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

July 29, 2020 EX-99.1

ManTech Announces Financial Results for Second Quarter of 2020

Exhibit 99.1 ManTech Announces Financial Results for Second Quarter of 2020 • Revenue: $632 million, up 18% from the second quarter of 2019 • EBITDA Margin: 8.9% • Diluted EPS: $0.74, up 23% from the second quarter of 2019 • Adjusted Diluted EPS: $0.84, up 20% from the second quarter of 2019 • Bookings of $663 million resulting in a book-to-bill ratio of 1.0 • Cash Flow from Operations: $62 millio

June 15, 2020 EX-99.1

ManTech Announces Leadership and Organizational Changes

EX-99.1 Exhibit 99.1 ManTech Announces Leadership and Organizational Changes HERNDON, Va., (June 15, 2020) (GLOBE NEWSWIRE) – ManTech (NASDAQ: MANT) today announced the appointment of Matt Tait as Chief Operating Officer (COO) effective July 1, 2020, a new role in which he will report directly to Kevin M. Phillips, ManTech’s President and CEO. In addition, the company is implementing an important

June 15, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 11, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

May 28, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Com

May 1, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Inter

April 29, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 29, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (C

April 29, 2020 EX-99.1

ManTech Announces Financial Results for First Quarter of 2020

Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2020 • Revenue: $611 million, up 22% from the first quarter of 2019 • EBITDA Margin: 9.0% • Diluted EPS: $0.71, up 34% from the first quarter of 2019 • Adjusted Diluted EPS: $0.81, up 31% from the first quarter of 2019 • Bookings of $1.1 billion resulting in a book-to-bill ratio of 1.8 • Cash Flow from Operations: $43 million HE

April 17, 2020 DEF 14A

MANT / ManTech International Corp. DEF 14A - - DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy State

March 10, 2020 EX-10.1

ManTech International Corporation 2020 Executive Incentive Compensation Plan

EX-10.1 Exhibit 10.1 MANTECH INTERNATIONAL CORPORATION 2020 EXECUTIVE INCENTIVE COMPENSATION PLAN 1.0 OVERVIEW ManTech International Corporation (Company) has established this 2020 Executive Incentive Compensation Plan (Plan) to help attract, retain and motivate our executives to achieve certain goals and objectives. Incentive compensation is an integral part of the Company’s compensation program.

March 10, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 4, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

February 21, 2020 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech International Corpora

February 21, 2020 EX-21.1

Subsidiaries of the Registrant.

EXHIBIT 21.1 Subsidiaries of the Registrant The significant subsidiaries of the Registrant, as defined in Section 1-02(w) of regulation S-X, are: ManTech Advanced Systems International, Inc. ManTech SRS Technologies, Inc. InfoZen LLC Edaptive Systems LLC Knowledge Consulting Group, Inc.

February 21, 2020 EX-4.2

Description of Securities of the Registrant (incorporated herein by reference from registrant’s Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the SEC on February 21, 2020).

DESCRIPTION OF THE COMPANY’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a brief description of the Class A common stock, $0.

February 19, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 19, 2020 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

February 19, 2020 EX-99.1

ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2019

Exhibit 99.1 ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2019 • Revenue: $604 million for the fourth quarter and $2.22 billion for the year (9% organic growth) • EBITDA Margin: 9.0% for the fourth quarter and 8.7% for the year • Diluted EPS: $1.00 for the fourth quarter and $2.83 for the year • Adjusted Diluted EPS: $0.81 for the fourth quarter and $2.91 for the year • B

February 14, 2020 SC 13G/A

MANT / ManTech International Corp. / Pedersen George J - SC 13G/A Passive Investment

SC 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c) and (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No.

February 12, 2020 SC 13G/A

MANT / ManTech International Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5)* MANTECH INTERNATIONAL CORP-A (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

February 11, 2020 SC 13G/A

MANT / ManTech International Corp. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: ManTech International Corp/VA Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule i

November 1, 2019 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech I

October 30, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 30, 2019 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

October 30, 2019 EX-99.1

ManTech Announces Financial Results for Third Quarter of 2019

Exhibit 99.1 ManTech Announces Financial Results for Third Quarter of 2019 • Bookings of $1.3 billion, resulting in a book-to-bill ratio of 2.2 • Revenue: $579 million, up 16% from third quarter of 2018 • Operating Income: $38.4 million for an operating margin of 6.6% • Diluted EPS: $0.69, up 25% from third quarter of 2018 • Cash Flow from Operations: $110 million or 3.9 times net income • H2M Gro

August 2, 2019 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Intern

July 31, 2019 EX-99.1

ManTech Announces Financial Results for Second Quarter of 2019

Exhibit 99.1 ManTech Announces Financial Results for Second Quarter of 2019 • Bookings of $657 million, resulting in a book-to-bill ratio of 1.2 • Revenues: $537 million, up 9% from second quarter of 2018 • Operating Income: $33.3 million for an operating margin of 6.2% • Diluted EPS: $0.60, up 20% from second quarter of 2018 • Cash Flow from Operations: $76 million or 3.1 times net income HERNDON

July 31, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 31, 2019 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

May 23, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2019 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction (Commission (IRS Emplo

May 22, 2019 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2019 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction (Commission (IRS Emplo

May 3, 2019 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Inter

May 3, 2019 EX-10.2

Performance-Based Restricted Stock Unit Award Agreement with Matthew A. Tait granted under the Management Incentive Plan

Exhibit 10.2 PERFORMANCE-BASED RESTRICTED STOCK UNIT AWARD AGREEMENT This RESTRICTED STOCK UNIT AWARD AGREEMENT (Agreement), effective as of March 15, 2019, is between ManTech International Corporation (Company), and Matthew A. Tait, pursuant to the terms of the Management Incentive Plan of ManTech International Corporation - 2016 Restatement, as may be amended from time to time (Plan). Capitalize

May 1, 2019 EX-99.1

ManTech Announces Financial Results for First Quarter of 2019

Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2019 • Bookings of $556 million, resulting in a book-to-bill ratio of 1.1 and a LTM book-to-bill of 1.8 • Revenues: $502 million, up 6% from first quarter of 2018 • Operating Income: $28.5 million for an operating margin of 5.7% • Diluted EPS: $0.53, up 4% from first quarter of 2018 • Cash Flow from Operations: $47 million or 2.

May 1, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 1, 2019 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Comm

April 12, 2019 DEF 14A

MANT / ManTech International Corp. DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for use of the Commission only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy State

March 11, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 5, 2019 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

March 11, 2019 EX-10.1

ManTech International Corporation 2019 Executive Incentive Compensation Plan

MANTECH INTERNATIONAL CORPORATION 2019 EXECUTIVE INCENTIVE COMPENSATION PLAN 1.0 OVERVIEW ManTech International Corporation (the “Company”) has established this 2019 Executive Incentive Compensation Plan (this “Plan”) to help attract, retain and motivate our executives to achieve certain goals and objectives. Incentive compensation is an integral part of the Company’s compensation program. This Pl

February 22, 2019 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech International Corpora

February 22, 2019 EX-21.1

Subsidiaries of the Registrant.

EXHIBIT 21.1 Subsidiaries of the Registrant The significant subsidiaries of the Registrant, as defined in Section 1-02(w) of regulation S-X, are: ManTech Advanced Systems International, Inc. ManTech SRS Technologies, Inc. InfoZen LLC Edaptive Systems LLC Knowledge Consulting Group, Inc.

February 20, 2019 EX-99.1

ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2018

Exhibit 99.1 ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2018 • Revenues: $497 million for the fourth quarter and $1.96 billion for the year (9% organic growth) • Operating Margin: 5.8% for the fourth quarter and for the year • Diluted EPS: $0.50 for the fourth quarter and $2.06 for the year • Book-to-Bill Ratio: 1.2 for the fourth quarter and 1.8 for the year • Cash Flo

February 20, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 20, 2019 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

February 14, 2019 SC 13G/A

MANT / ManTech International Corp. / Pedersen George J - SC 13G/A Passive Investment

SC 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c) and (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No.

February 11, 2019 SC 13G/A

MANT / ManTech International Corp. / VANGUARD GROUP INC Passive Investment

mantechinternationalcorpva.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7 )* Name of issuer: ManTech International Corp/VA Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2018 Check

February 8, 2019 SC 13G/A

MANT / ManTech International Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* MANTECH INTERNATIONAL CORP-A (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

November 2, 2018 10-Q

MANT / ManTech International Corp. 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2018 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech I

November 1, 2018 EX-99.1

ManTech Announces Financial Results for Third Quarter of 2018

EX-99.1 2 fy18q3earningsreleaseexhib.htm EXHIBIT 99.1 Exhibit 99.1 ManTech Announces Financial Results for Third Quarter of 2018 • Bookings of $1.1 billion, resulting in a book-to-bill ratio of 2.2 • Revenues: $497 million, up 18% from third quarter of 2017 • Operating Income: $29.4 million for an operating margin of 5.9% • Diluted EPS: $0.55, up 41% from third quarter of 2017 • Cash Flow from Ope

November 1, 2018 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 1, 2018 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

August 3, 2018 10-Q

MANT / ManTech International Corp. 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2018 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Intern

August 1, 2018 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 1, 2018 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (C

August 1, 2018 EX-99.1

ManTech Announces Financial Results for Second Quarter of 2018

Exhibit 99.1 ManTech Announces Financial Results for Second Quarter of 2018 • Bookings of $1.3 billion, resulting in a book-to-bill ratio of 2.7 • Revenues: $491 million, up 19% from second quarter of 2017 • Operating Income: $28.3 million for an operating margin of 5.8% • Diluted EPS: $0.50, up 25% from second quarter of 2017 • Cash Flow from Operations: $53 million or 2.7 times net income FAIRFA

May 18, 2018 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 17, 2018 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction (Commission (IRS Emplo

May 4, 2018 10-Q

MANT / ManTech International Corp. 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2018 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Inter

May 2, 2018 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 2, 2018 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Comm

May 2, 2018 EX-99.1

ManTech Announces Financial Results for First Quarter of 2018

Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2018 • Revenues: $473 million, up 13% from first quarter of 2017 • Operating Income: $26.4 million for an operating margin of 5.6% • Diluted EPS: $0.51, up 31% from first quarter of 2017 • Bookings of $430 million, resulting in a book-to-bill ratio of 0.9 and a LTM book-to-bill of 2.2 FAIRFAX, Va., May 2, 2018 (GLOBE NEWSWIRE) –

April 13, 2018 DEF 14A

MANT / ManTech International Corp. DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for use of the Commission only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy State

March 9, 2018 EX-10.1

ManTech International Corporation 2018 Executive Incentive Compensation Plan

Exhibit 10.1 MANTECH INTERNATIONAL CORPORATION 2018 EXECUTIVE INCENTIVE COMPENSATION PLAN 1.0 OVERVIEW ManTech International Corporation (the “Company”) has established this 2018 Executive Incentive Compensation Plan (this “Plan”) to help attract, retain and motivate our executives to achieve certain goals and objectives. Incentive compensation is an integral part of the Company’s compensation pro

March 9, 2018 EX-10.2

Form of Time-Based Restricted Stock Unit Award Agreement granted under the Management Incentive Plan (incorporated herein by reference from registrant's Current Report on Form 8-K, as filed with the SEC on March 9, 2018).

Exhibit 10.2 FORM OF RESTRICTED STOCK UNIT AWARD AGREEMENT This RESTRICTED STOCK UNIT AWARD AGREEMENT (the “Agreement”), effective as of , 2018, is between ManTech International Corporation (the “Company”), and (the “Grantee”), pursuant to the terms of the Management Incentive Plan of ManTech International Corporation - 2016 Restatement, as may be amended from time to time (the “Plan”). Capitalize

March 9, 2018 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 6, 2018 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

March 8, 2018 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 5, 2018 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

February 23, 2018 10-K

MANT / ManTech International Corp. 10-K (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2017 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech International Corpora

February 23, 2018 EX-21.1

Subsidiaries of the Registrant.

EXHIBIT 21.1 Subsidiaries of the Registrant The significant subsidiaries of the Registrant, as defined in Section 1-02(w) of regulation S-X, are: ManTech Advanced Systems International, Inc. ManTech SRS Technologies, Inc. InfoZen LLC Edaptive Systems LLC Knowledge Consulting Group, Inc.

February 21, 2018 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 21, 2018 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incor

February 21, 2018 EX-99.1

ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2017

Exhibit Exhibit 99.1 ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2017 ? Revenues: $462 million for the fourth quarter, $1.72 billion for the fiscal year ? Operating Margin: 5.6% for the fourth quarter, 5.7% for the fiscal year ? Diluted EPS: $1.73 for the fourth quarter, $2.91 for the fiscal year inclusive of one-time benefit related to the Tax Cuts and Jobs Act of 2017

February 13, 2018 EX-99.1

JOINT FILING AGREEMENT

JOINT FILING AGREEMENT The undersigned hereby agree that they are filing this statement jointly pursuant to Rule 13d-1(k)(1).

February 13, 2018 SC 13G/A

MANT / ManTech International Corp. / RE ADVISERS CORP - MANTECH 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G* (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2 (AMENDMENT NO. )* MANTECH INTERNATIONAL CORPORATION (Name of Issuer) Class A Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2017 (Date of

February 9, 2018 SC 13G/A

MANT / ManTech International Corp. / VANGUARD GROUP INC Passive Investment

mantechinternationalcorp.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6 )* Name of issuer: ManTech International Corp Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2017 Check the

February 9, 2018 SC 13G/A

MANT / ManTech International Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* MANTECH INTERNATIONAL CORP-A (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2017 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

December 13, 2017 EX-3.2(II)

Third Amended and Restated Bylaws of ManTech International Corporation, marked to show amendments effective December 11, 2017.

EX-3.2(ii) Exhibit 3.2(ii) THIRD AMENDED AND RESTATED BYLAWS OF MANTECH INTERNATIONAL CORPORATION (a Delaware corporation) Adopted and Effective October 29, 2003 as of December 11, 2017 ARTICLE I OFFICES 1.1 Registered Office. The registered office of the Corporation shall be fixed in the Certificate of Incorporation of the Corporation. 1.2 Other Offices. The principal office of the Corporation sh

December 13, 2017 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 11, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporat

December 13, 2017 EX-3.2(I)

Third Amended and Restated Bylaws of the Registrant (incorporated herein by reference from registrant's Current Report on Form 8-K, as filed with the SEC on December 13, 2017).

EX-3.2(i) Exhibit 3.2(i) THIRD AMENDED AND RESTATED BYLAWS OF MANTECH INTERNATIONAL CORPORATION (a Delaware corporation) Adopted and Effective as of December 11, 2017 ARTICLE I OFFICES 1.1 Registered Office. The registered office of the Corporation shall be fixed in the Certificate of Incorporation of the Corporation. 1.2 Other Offices. The principal office of the Corporation shall be located in t

December 13, 2017 EX-99.1

ManTech Announces CEO Transition Plan George J. Pedersen to Continue Service as Executive Chairman Kevin M. Phillips Appointed as President and Chief Executive Officer

EX-99.1 Exhibit 99.1 ManTech Announces CEO Transition Plan George J. Pedersen to Continue Service as Executive Chairman Kevin M. Phillips Appointed as President and Chief Executive Officer HERNDON, VA, December 13, 2017 (GLOBE NEWSWIRE) ? ManTech International Corporation (Nasdaq: MANT) today announced that George J. Pedersen, the company?s Chairman and Chief Executive Officer, will transition fro

November 2, 2017 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2017 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech I

November 1, 2017 EX-99.1

ManTech Announces Financial Results for Third Quarter of 2017

Exhibit Exhibit 99.1 ManTech Announces Financial Results for Third Quarter of 2017 ? Bookings of $1.9 billion , resulting in a book-to-bill ratio of 4.5 ; strongest quarterly bookings in five years ? Revenues: $423 million , up 2% from third quarter of 2016 ? Operating Income: $23.1 million for an operating margin of 5.5% ? Diluted EPS: $0.39 , up 3% from third quarter of 2016 ? Cash Flow from Ope

November 1, 2017 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 1, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorp

September 18, 2017 8-K

Other Events

mant-8k20170915.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 15, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdict

August 23, 2017 8-K

ManTech International 8-K BV (Current Report/Significant Event)

mant-8k20170822.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 21, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction

August 23, 2017 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

mant-8k20170817.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 17, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction

August 23, 2017 EX-10.1

Second Amended and Restated Credit Agreement dated August 17, 2017, by and among the registrant and a syndicate of lenders, including Bank of America, N.A., acting as administrative agent for the lenders (incorporated herein by reference from the registrant's Current Report on Form 8-K, as filed with the SEC on August 23, 2017.)

mant-ex101134.htm Exhibit 10.1 EXECUTION VERSION Published CUSIP Number: 56456CAG9 Revolving Credit CUSIP Number: 56456CAH7 $500,000,000 SECOND AMENDED AND RESTATED CREDIT AGREEMENT Dated as of August 17, 2017 among MANTECH INTERNATIONAL CORPORATION, as the Borrower, BANK OF AMERICA, N.A., as Administrative Agent and L/C Issuer, PNC Bank, National Association, as Swing Line Lender BRANCH BANKING &

August 4, 2017 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2017 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Intern

August 2, 2017 EX-99.1

ManTech Announces Financial Results for Second Quarter of 2017

Exhibit Exhibit 99.1 ManTech Announces Financial Results for Second Quarter of 2017 ? Revenues: $414 million , up 3.1% from second quarter of 2016 ? Operating Income: $24.9 million , up 3% from second quarter of 2016 ? Operating Margin: 6.0% for the second quarter ? Diluted EPS: $0.40 , up 3% from second quarter of 2016 ? Book-to-Bill Ratio: 1.2 for the second quarter ? Cash Flow from Operations:

August 2, 2017 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 2, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (C

May 22, 2017 8-K

Submission of Matters to a Vote of Security Holders

mant-8k20170517.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 17, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction (C

May 3, 2017 8-K

ManTech International 8-K (Current Report/Significant Event)

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporati

May 3, 2017 EX-99.1

ManTech Announces Financial Results for First Quarter of 2017

Exhibit Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2017 ? Revenues: $418 million , up 7.1% from first quarter of 2016 ? Operating Margin: 5.8% for the first quarter and operating income up 11% from first quarter of 2016 ? Diluted EPS: $0.39 , up 11% from first quarter of 2016 ? Book-to-Bill Ratio: 1.7 for the first quarter; strongest Q1 book-to-bill since 2008 ? Cash Flo

May 3, 2017 10-Q

ManTech International 10-Q (Quarterly Report)

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2017 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManT

April 7, 2017 DEF 14A

ManTech International DEF 14A

mant-def14a20170517.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for use of the Commission only (as permitted by Rule 14a-6(e)(2))

March 13, 2017 EX-10.2

Form of Performance-Based Restricted Stock Unit Agreement granted under the Management Incentive Plan (incorporated herein by reference from registrant's Current Report on Form 8-K, as filed with the SEC on March 13, 2017).

EX-10.2 Exhibit 10.2 FORM OF PERFORMANCE-BASED RESTRICTED STOCK UNIT AWARD AGREEMENT This RESTRICTED STOCK UNIT AWARD AGREEMENT (Agreement), effective as of [ ], 2017, is between ManTech International Corporation (Company), and [ ](Grantee), pursuant to the terms of the Management Incentive Plan of ManTech International Corporation ? 2016 Restatement, as may be amended from time to time (Plan). Ca

March 13, 2017 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 7, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

March 13, 2017 EX-10.1

ManTech International Corporation 2017 Executive Compensation Plan, adopted on March 7, 2017 in which our executive officers participate (incorporated herein by reference from registrant's Current Report on Form 8-K, as filed with the SEC on March 13, 2017).

EX-10.1 Exhibit 10.1 MANTECH INTERNATIONAL CORPORATION 2017 EXECUTIVE INCENTIVE COMPENSATION PLAN 1.0 OVERVIEW ManTech International Corporation (the ?Company?) has established this 2017 Executive Incentive Compensation Plan (this ?Plan?) to help attract, retain and motivate our executives to achieve certain goals and objectives. Incentive compensation is an integral part of the Company?s compensa

February 22, 2017 8-K

ManTech International 8-K (Current Report/Significant Event)

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 22, 2017 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incor

February 22, 2017 EX-99.1

ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2016

Exhibit Exhibit 99.1 ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2016 ? Revenues: $394 million for the fourth quarter, $1.60 billion for the fiscal year ? Operating Margin: 5.4% for the fourth quarter, 5.7% for the fiscal year ? Diluted EPS: $0.35 for the fourth quarter, $1.47 for the fiscal year ? Book-to-Bill Ratio: 1.2 for the fourth quarter, 1.4 for the fiscal year ?

February 22, 2017 10-K

ManTech International 10-K (Annual Report)

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2016 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Internationa

February 22, 2017 EX-21.1

Subsidiaries of the Registrant

EXHIBIT 21.1 Subsidiaries of the Registrant The significant subsidiaries of the Registrant, as defined in Section 1-02(w) of regulation S-X, are: ManTech Advanced Systems International, Inc. ManTech SRS Technologies, Inc.

February 22, 2017 EX-10.12

RESTRICTED STOCK UNIT AWARD AGREEMENT

RESTRICTED STOCK UNIT AWARD AGREEMENT This RESTRICTED STOCK UNIT AWARD AGREEMENT (this Agreement), effective as of November 7, 2016, is between ManTech International Corporation (the “Company”), and Kevin M.

February 14, 2017 SC 13G

MANT / ManTech International Corp. / RE ADVISERS CORP - MANTECH 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )* MANTECH INTERNATIONAL CORPORATION (Name of Issuer) Class A Common Stock (Title of Class of Securities) 564563104 (

February 14, 2017 EX-99

JOINT FILING AGREEMENT

JOINT FILING AGREEMENT The undersigned hereby agree that they are filing this statement jointly pursuant to Rule 13d-1(k)(1).

February 10, 2017 SC 13G/A

MANT / ManTech International Corp. / VANGUARD GROUP INC Passive Investment

mantechinternationalcorp.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 4 )* Name of issuer: ManTech International Corp Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2016 Check the

February 10, 2017 SC 13G/A

ManTech International 3G/A (Passive Acquisition of More Than 5% of Shares)

mantechinternationalcorp.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 4 )* Name of issuer: ManTech International Corp Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2016 Check the

February 10, 2017 SC 13G/A

ManTech International 3G/A (Passive Acquisition of More Than 5% of Shares)

mantechinternationalcorp.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5 )* Name of issuer: ManTech International Corp Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: January 31, 2017 Check the a

February 9, 2017 SC 13G/A

MANT / ManTech International Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* MANTECH INTERNATIONAL CORP-A (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2016 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

November 7, 2016 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 1, 2016 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorp

November 7, 2016 EX-99.1

ManTech Promotes Kevin Phillips to President and Chief Operating Officer and Judith Bjornaas to Chief Financial Officer

EX-99.1 Exhibit 99.1 ManTech Promotes Kevin Phillips to President and Chief Operating Officer and Judith Bjornaas to Chief Financial Officer HERNDON, Va., November 2, 2016 (GLOBE NEWSWIRE) ? ManTech International Corporation (Nasdaq:MANT) announced today that Kevin M. Phillips has been promoted to president and chief operating officer (COO). In this role, Phillips will assume overall responsibilit

November 4, 2016 10-Q

ManTech International 10-Q (Quarterly Report)

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2016 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604

November 2, 2016 EX-99.1

ManTech Announces Financial Results for Third Quarter of 2016

Exhibit Exhibit 99.1 ManTech Announces Financial Results for Third Quarter of 2016 ? Revenues: $415 million , up 5.7% ( 4.7% organic) from third quarter of 2015 ? Operating Margin: 5.7% for the third quarter, operating income up 11% from third quarter of 2015 ? Diluted EPS: $0.38 , up 9% from third quarter of 2015 ? Book-to-Bill Ratio: 2.1 for the third quarter ? Cash Flow from Operations: $32 mil

November 2, 2016 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2016 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorp

November 2, 2016 EX-99.2

ManTech Promotes Kevin Phillips to President and Chief Operating Officer and Judith Bjornaas to Chief Financial Officer

EX-99.2 3 fy16q3earningsreleaseex992.htm EXHIBIT 99.2 Exhibit 99.2 ManTech Promotes Kevin Phillips to President and Chief Operating Officer and Judith Bjornaas to Chief Financial Officer HERNDON, Va., November 2, 2016 (GLOBE NEWSWIRE) - ManTech International Corporation (Nasdaq:MANT) announced today that Kevin M. Phillips has been promoted to president and chief operating officer (COO). In this ro

July 29, 2016 EX-10.1

Amendment No. 1 to Amended and Restated Credit Agreement dated May 17, 2016, by and among the registrant and a syndicate of lenders, including Bank of America, N.A., acting as administrative agent for the lenders (incorporated herein by reference from the registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 2016, as filed with the SEC on July 29, 2016.)

Exhibit Execution Version AMENDMENT NO. 1 TO AMENDED AND RESTATED CREDIT AGREEMENT THIS AMENDMENT NO. 1 TO AMENDED AND RESTATED CREDIT AGREEMENT dated as of May 17, 2016 (this ? Amendment ?) is entered into among MANTECH INTERNATIONAL CORPORATION, a Delaware corporation (the ? Borrower ?), the Subsidiaries identified on the signature pages hereto (collectively, the ? Guarantors ?), the Lenders ide

July 29, 2016 10-Q

ManTech International 10-Q (Quarterly Report)

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2016 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTe

July 29, 2016 EX-10.2

Management Incentive Plan of ManTech International Corporation - 2016 Restatement (incorporated herein by reference from registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 2016, as filed with the SEC on July 29, 2016).

Exhibit MANAGEMENT INCENTIVE PLAN OF MANTECH INTERNATIONAL CORPORATION 2016 RESTATEMENT SECTION I?PURPOSE OF PLAN The purpose of this Management Incentive Plan (this ?Plan?) of ManTech International Corporation, a Delaware corporation (?ManTech?), is to enable ManTech and its subsidiaries and affiliates (the ?Company?) to attract, retain and motivate its directors, officers and other senior management and technical personnel and to further align the interests of such persons with those of the stockholders of ManTech by providing for or increasing the proprietary interest of such persons in ManTech.

July 27, 2016 EX-99.1

ManTech Announces Financial Results for Second Quarter of 2016

Exhibit Exhibit 99.1 ManTech Announces Financial Results for Second Quarter of 2016 • Revenues: $401 million , up 4.4% from second quarter of 2015 • Operating Margin: 6.0% for the second quarter, operating income up 15% from second quarter of 2015 • Diluted EPS: $0.39 , up 18% from second quarter of 2015 • Book-to-Bill Ratio: 1.2 for the second quarter and year to date • Cash Flow from Operations:

July 27, 2016 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 27, 2016 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorpora

May 11, 2016 8-K

ManTech International FORM 8-K (Current Report/Significant Event)

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2016 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporati

April 29, 2016 10-Q

ManTech International 10-Q (Quarterly Report)

10-Q UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2016 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech

April 27, 2016 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 27, 2016 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation

April 27, 2016 EX-99.1

ManTech Announces Financial Results for First Quarter of 2016

Exhibit Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2016 ? Revenues: $391 million , up 5.5% from first quarter of 2015 ? Operating Margin: 5.6% for the first quarter and operating income up 11% from first quarter of 2015 ? Diluted EPS: $0.35 , up 13% from first quarter of 2015 ? Book-to-Bill Ratio: 1.3 for the first quarter; fourth consecutive quarter at or above 1.0 ? Ca

April 1, 2016 DEF 14A

ManTech International DEF 14A

DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for use of the Commission only (as permitted by Rule 14a-6(e)(2)) x Definitive Pro

March 17, 2016 8-K

ManTech International FORM 8-K (Current Report/Significant Event)

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 11, 2016 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction (Commission

March 17, 2016 EX-99.1

ManTech Announces Stephen Porter’s Retirement and Appointment as Director Emeritus

EX-99.1 Exhibit 99.1 ManTech Announces Stephen Porter?s Retirement and Appointment as Director Emeritus FAIRFAX, Va., March 17, 2016 (GLOBE NEWSWIRE) ? ManTech International Corporation (Nasdaq:MANT) announced that Stephen Porter will retire from the Company?s Board of Directors following the completion of his current Board term. Mr. Porter will, however, continue his association with and contribu

March 11, 2016 EX-10.1

MANTECH INTERNATIONAL CORPORATION 2016 EXECUTIVE INCENTIVE COMPENSATION PLAN

EX-10 Exhibit 10.1 MANTECH INTERNATIONAL CORPORATION 2016 EXECUTIVE INCENTIVE COMPENSATION PLAN 1.0 OVERVIEW ManTech International Corporation (the ?Company?) has established this 2016 Executive Incentive Compensation Plan (this ?Plan?) to help attract, retain and motivate our executives to achieve certain goals and objectives. Incentive compensation is an integral part of the Company?s compensati

March 11, 2016 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 8, 2016 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorpora

March 7, 2016 SC 13G/A

MANT / ManTech International Corp. / HEARTLAND ADVISORS INC - AMENDMENT NO. 3 TO SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* ManTech International Corporation (Name of Issuer) Class A Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) February 29, 2016 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule purs

February 19, 2016 EX-21.1

Subsidiaries of the Registrant

EXHIBIT 21.1 Subsidiaries of the Registrant The significant subsidiaries of the Registrant, as defined in Section 1-02(w) of regulation S-X, are: ManTech Advanced Systems International, Inc. ManTech SRS Technologies, Inc.

February 19, 2016 EX-10.10

Form of Executive Continuity and Stay Incentive Agreement, by and between each of our executive officers and the registrant, (incorporated herein by reference from registrant's Annual Report on Form 10-K for the year ended December 31, 2015, as filed with the SEC on February 19, 2016.)

Exhibit 10.10 [FORM OF] Executive Continuity and Stay Incentive Agreement This Executive Continuity and Stay Incentive Agreement (the “Agreement”) dated as of [], 2015 (the “Effective Date”), by and between ManTech International Corporation, a Delaware corporation (the “Company”), and [] (the “Executive,” and together with the Company, the “Parties”). PURPOSE WHEREAS, the Executive is employed by

February 19, 2016 10-K

MANT / ManTech International Corp. 10-K - Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2015 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech International Corpora

February 17, 2016 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 17, 2016 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporat

February 17, 2016 EX-99.1

ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2015

Exhibit Exhibit 99.1 ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2015 ? Revenues: $402 million for the fourth quarter, $1.55 billion for the fiscal year ? Exiting 2015 with three quarters of consecutive revenue growth ? Operating Margin: 5.7% for the fourth quarter, 5.5% for the fiscal year ? Diluted EPS: $0.37 for the fourth quarter, $1.36 for the fiscal year ? Book-to-

February 10, 2016 SC 13G/A

MANT / ManTech International Corp. / VANGUARD GROUP INC Passive Investment

mantechinternationalcorpva.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 3 )* Name of issuer: ManTech International Corp/VA Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2015 Check

February 9, 2016 SC 13G/A

MANT / ManTech International Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* MANTECH INTERNATIONAL CORP-A (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2015 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

February 5, 2016 SC 13G/A

ManTech International AMENDMENT NO. 2 TO SCHEDULE 13G (Passive Acquisition of More Than 5% of Shares)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* ManTech International Corporation (Name of Issuer) Class A Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2015 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule purs

December 9, 2015 8-K

ManTech International FORM 8-K (Current Report/Significant Event)

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 3, 2015 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorp

October 30, 2015 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

10-Q 1 mant-9302015x10q.htm 10-Q UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2015 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commis

October 28, 2015 EX-99.1

ManTech Announces Financial Results for Third Quarter of 2015

Exhibit Exhibit 99.1 ManTech Announces Financial Results for Third Quarter of 2015 ? Revenues: $393.0 million , up 2% from second quarter of 2015 ? Diluted EPS: $0.35 , up 6% from second quarter of 2015 ? Bookings of $1.3 billion or 3.2 x book-to-bill with 30% of awards for new work ? Cash Flow from Operations: $103 million or 8 times net income FAIRFAX, Va., October 28, 2015 (GLOBE NEWSWIRE) ? Ma

October 28, 2015 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 28, 2015 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporati

July 31, 2015 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2015 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Intern

July 29, 2015 8-K

ManTech International FORM 8-K (Current Report/Significant Event)

FY15 Q2 Form 8K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2015 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of in

July 29, 2015 EX-99.1

ManTech Announces Financial Results for Second Quarter of 2015

FY15 Q2 Earnings Release Exhibit 99.1 Exhibit 99.1 ManTech Announces Financial Results for Second Quarter of 2015 ? Revenues: $384.4 million , up 4% from first quarter of 2015 ? Operating Income: $21.1 million , up 6% from first quarter of 2015 ? Diluted EPS: $0.33 , up 6% sequentially and up 57% year-over-year ? Book-to-Bill Ratio: 1.8 x, with 58% of awards for new work ? Cash Flow from Operation

May 12, 2015 8-K

ManTech International FORM 8-K (Current Report/Significant Event)

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 7, 2015 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporati

May 1, 2015 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2015 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Inter

April 29, 2015 EX-99.1

ManTech Announces Financial Results for First Quarter of 2015

FY15 Q1 Earnings Release Exhibit 99.1 Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2015 ? Revenues: $370 million ; Operating Income: $20 million ; Diluted EPS: $0.31 ? Operating Margin of 5.4% , up 100 basis points from first quarter of 2014 ? Cash Flow from Operations: $26 million or 2.2 times net income ? Acquisition of Welkin Associates, Ltd. expands high-end solutions

April 29, 2015 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 29, 2015 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (C

April 1, 2015 DEF 14A

ManTech International DEFINITIVE PROXY STATEMENT

Definitive Proxy Statement UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

March 17, 2015 EX-10.1

MANTECH INTERNATIONAL CORPORATION 2015 EXECUTIVE INCENTIVE COMPENSATION PLAN

EX-10.1 Exhibit 10.1 MANTECH INTERNATIONAL CORPORATION 2015 EXECUTIVE INCENTIVE COMPENSATION PLAN 1.0 OVERVIEW ManTech International Corporation (the ?Company?) has established this 2015 Executive Incentive Compensation Plan (this ?Plan?) to help attract, retain and motivate our executives to achieve certain goals and objectives. Incentive compensation is an integral part of the Company?s compensa

March 17, 2015 8-K

ManTech International 8-K (Current Report/Significant Event)

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 11, 2015 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation

March 17, 2015 EX-10.2

[FORM OF PERFORMANCE-BASED RESTRICTED STOCK UNIT AWARD AGREEMENT]

EX-10.2 Exhibit 10.2 [FORM OF PERFORMANCE-BASED RESTRICTED STOCK UNIT AWARD AGREEMENT] This RESTRICTED STOCK UNIT AWARD AGREEMENT (this “Agreement”), effective as of March 13, 2015, is between ManTech International Corporation (the “Company”), and (the “Grantee”), pursuant to the terms of the Management Incentive Plan of ManTech International Corporation 2011 Restatement, as may be amended from ti

February 20, 2015 EX-18

February 20, 2015

EX-18 2 mant12-31x2014ex18.htm EXHIBIT 18 EXHIBIT 18 February 20, 2015 ManTech International Corporation 12015 Lee Jackson Highway Fairfax, Virginia 22033 Dear Sirs/Madams: We have audited the consolidated financial statements of ManTech International Corporation as of December 31, 2014 and 2013, and for each of the three years in the period ended December 31, 2014, included in your Annual Report

February 20, 2015 EX-21.1

Subsidiaries of the Registrant

EX-21.1 3 mant12-31x2014ex211.htm EXHIBIT 21.1 EXHIBIT 21.1 Subsidiaries of the Registrant The significant subsidiaries of the Registrant, as defined in Section 1-02(w) of regulation S-X, are: ManTech Advanced Systems International, Inc. ManTech SRS Technologies, Inc.

February 20, 2015 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2014 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech International Corpora

February 18, 2015 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 18, 2015 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

February 18, 2015 EX-99.1

ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2014

EX-99.1 2 fy14q4earningsreleaseexhib.htm EXHIBIT 99.1 Exhibit 99.1 ManTech Announces Financial Results for Fourth Quarter and Fiscal Year 2014 • Revenues: $411.4 million for the fourth quarter, $1.77 billion for the fiscal year • Operating Margin: 5.8% for the fourth quarter, 5.3% for the fiscal year • Diluted EPS: $0.39 for the fourth quarter, $1.27 for the fiscal year • Book-to-Bill Ratio: 0.9 f

February 17, 2015 SC 13G/A

MANT / ManTech International Corp. / NATIONAL RURAL ELECTRIC COOPERATIVE ASSOCIATION - MANTECH INTERNATIONAL AMENDED 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1)* MANTECH INTERNATIONAL CORPORATION (Name of Issuer) Class A Common Stock (Title of Class of Securities) 564563104

February 13, 2015 SC 13G/A

MANT / ManTech International Corp. / HEARTLAND ADVISORS INC - AMENDMENT NO. 1 TO SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* ManTech International Corporation (Name of Issuer) Class A Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2014 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule purs

February 11, 2015 SC 13G/A

MANT / ManTech International Corp. / VANGUARD GROUP INC Passive Investment

mantechinternationalcorpva.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 2 )* Name of issuer: ManTech International Corp/VA Title of Class of Securities: Common Stock CUSIP Number: 564563104 Date of Event Which Requires Filing of this Statement: December 31, 2014 Check

February 5, 2015 SC 13G

MANT / ManTech International Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* MANTECH INTERNATIONAL CORP-A (Name of Issuer) Common Stock (Title of Class of Securities) 564563104 (CUSIP Number) December 31, 2014 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

December 17, 2014 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 11, 2014 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporat

November 18, 2014 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 18, 2014 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporat

October 31, 2014 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2014 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech I

October 29, 2014 EX-99.1

ManTech Announces Financial Results for Third Quarter of 2014

Exhibit 99.1 ManTech Announces Financial Results for Third Quarter of 2014 • Increase in Earnings, Profitability, and Bookings compared to Q2 FY14 • Revenues: $447.2 million • Operating Income: $26.7 million for an Operating Margin of 6.0% • Diluted EPS: $0.41, up 95.2% from Q2 FY14 • Cash Flow from Operations: $90 million for the quarter and $150 million year-to-date FAIRFAX, Va., October 29, 201

October 29, 2014 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 29, 2014 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation)

August 1, 2014 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2014 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Intern

July 30, 2014 EX-99.1

ManTech Announces Financial Results for Second Quarter of 2014

EX-99.1 2 fy14q2earningsreleaseexhib.htm EXHIBIT 99.1 Exhibit 99.1 ManTech Announces Financial Results for Second Quarter of 2014 • Increase in Revenues, Operating Income, and Bookings compared to Q1 FY14 • Revenues: $463.4 million • Operating Income: $24.1 million • Diluted EPS: $0.21 • Acquisition of 7DELTA to bolster Federal health IT business FAIRFAX, Va., July 30, 2014 (GLOBE NEWSWIRE) – ManT

July 30, 2014 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 30, 2014 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Co

June 19, 2014 EX-10.1

Credit Agreement, dated June 13, 2014, by and among the registrant and a syndicate of lenders, including Bank of America, N.A., acting as administrative agent for the lenders (incorporated herein by reference from the registrant's Current Report on Form 8-K filed with the SEC on June 19, 2014).

EX-10.1 Exhibit 10.1 Execution Version Published CUSIP Number: 56456CAE4 Revolving Credit CUSIP Number: 56456CAF1 $500,000,000 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of June 13, 2014 among MANTECH INTERNATIONAL CORPORATION, as the Borrower, The Other Lenders Party Hereto, PNC BANK, NATIONAL ASSOCIATION, as Swing Line Lender and BANK OF AMERICA, N.A., as Administrative Agent and L/C Issuer,

June 19, 2014 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant - FORM 8-K

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 13, 2014 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorpora

May 13, 2014 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 8, 2014 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation) (Comm

May 2, 2014 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2014 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech Inter

May 2, 2014 EX-12.1

Ratio of Earnings to Fixed Charges

Exhibit 12.1 Ratio of Earnings to Fixed Charges The following table provides our consolidated ratios of earnings to fixed charges (in thousands except ratios): Three months ended March 31, Year Ended December 31, 2014 2013 2012 2011 2010 Fixed Charges: Interest expense (1) $ 3,971 $ 15,696 $ 15,776 $ 15,304 $ 12,233 Amortized premiums, discounts and capitalized expenses related to indebtedness (2)

April 30, 2014 EX-99.1

ManTech Announces Financial Results for First Quarter of 2014

EX-99.1 2 d720251dex991.htm EX-99.1 Exhibit 99.1 ManTech Announces Financial Results for First Quarter of 2014 • Revenue: $452.0 million • Operating Income: $20.0 million • Diluted EPS: $0.26 • Cash Flow from Operations: $62 million • Cash Balance at Quarter End: $276 million • Redeemed $200 million of Senior Notes in April FAIRFAX, Va., April 30, 2014 – (GLOBE NEWSWIRE) – ManTech International Co

April 30, 2014 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 30, 2014 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation

April 30, 2014 EX-99.2

ManTech Announces Acquisition of 7Delta, Inc.

EX-99.2 Exhibit 99.2 ManTech Announces Acquisition of 7Delta, Inc. Acquisition Will Expand ManTech’s Healthcare IT Business to Department of Veterans Affairs FAIRFAX, Va., April 30, 2014 (GLOBE NEWSWIRE) — ManTech International Corporation (Nasdaq:MANT) has signed a definitive agreement to acquire 7Delta, Inc., a progressive company providing leading edge technology management solutions to the civ

April 18, 2014 8-K

Termination of a Material Definitive Agreement - 8-K

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 15, 2014 ManTech International Corporation (Exact name of registrant as specified in its charter) Delaware 000-49604 22-1852179 (State or other jurisdiction of incorporation

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