ATHL / - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

US
HINDI NA ACTIVE ANG SIMBONG ITO

Mga Batayang Estadistika
CIK 1574648
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
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 17, 2015 SC 13G/A

ATHL / / CITADEL ADVISORS LLC - SC 13G/A Passive Investment

SC 13G/A 1 v399234sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 and 13d-2 Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Athlon Energy Inc. (Name of Issuer) Common stock, par value $0.01 per share (Title of Class of Securities) 047477104 (CUSIP Number) December 31,

February 10, 2015 SC 13G/A

ATHL / / Apollo Management Holdings GP, LLC - SC 13G/A Passive Investment

SC 13G/A 1 a15-40674sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Amendment No. 1)* Under the Securities Exchange Act of 1934 ATHLON ENERGY INC. (Name of Issuer) Common Stock, par value $0.01 (Title of Class of Securities) 047477104 (CUSIP Number) December 31, 2014 (Date of Event Which Requires Filing of this Statement) Check the appropri

November 14, 2014 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on November 25, 2014, pursuant to the provisions of Rule 12d2-2 (a).

November 13, 2014 SC TO-T/A

ECN / ENCANA CORP SC TO-T/A - - SC TO-T/A

SC TO-T/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 5) ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Persons) COMMON STOCK, $0.0

November 13, 2014 SC 14D9/A

ATHL / SC 14D9/A - - AMENDMENT TO TENDER OFFER SOLICITATION / RECOMMENDATION STATEMENTS FILED UNDER RULE 14D-9

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 (Amendment No. 5) ATHLON ENERGY INC. (Name of Subject Company) ATHLON ENERGY INC. (Name of Person Filing Statement) Common Stock, par value $0.01 per share (Title of Class of Securities) 047477 104

November 13, 2014 EX-99.(A)(5)(XV)

Encana to complete transformative acquisition of Athlon Energy to establish premier position in oil-rich Permian Basin

EX-99.(A)(5)(XV) 2 d820081dex99a5xv.htm EX-99.(A)(5)(XV) Exhibit (a)(5)(xv) news release Encana to complete transformative acquisition of Athlon Energy to establish premier position in oil-rich Permian Basin Calgary, Alberta (November 13, 2014) TSX, NYSE: ECA Encana Corporation (Encana) (TSX, NYSE: ECA) announced today that the cash tender offer (the “Offer”) made by Alenco Acquisition Company Inc

November 13, 2014 EX-3.2

AMENDED AND RESTATED BY-LAWS ATHLON ENERGY INC. (A Delaware Corporation) ARTICLE 1

EX-3.2 Exhibit 3.2 AMENDED AND RESTATED BY-LAWS OF ATHLON ENERGY INC. (A Delaware Corporation) ARTICLE 1 STOCKHOLDERS 1.1 Place of Meetings. All meetings of stockholders shall be held at such place within or outside the State of Delaware as may be designated from time to time by the Board of Directors or the President or, if not so designated, at the registered office of the Corporation. 1.2 Annua

November 13, 2014 S-8 POS

ATHL / S-8 POS - - POST-EFFECTIVE AMENDMENT TO A S-8 REGISTRATION STATEMENT

As filed with the Securities and Exchange Commission on November 13, 2014 Registration No.

November 13, 2014 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, 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, 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 13, 2014 ATHLON ENERGY INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-36026 46-2549833 (State or Other Jurisdiction of Incorporation) (Commissio

November 13, 2014 EX-3.1

AMENDED AND RESTATED CERTIFICATE OF INCORPORATION ATHLON ENERGY INC.

EX-3.1 Exhibit 3.1 AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ATHLON ENERGY INC. FIRST: The name of the Corporation is ATHLON ENERGY INC. SECOND: The address of the Corporation’s registered office in the State of Delaware is 1209 Orange Street, in the City of Wilmington, County of New Castle, 19801. The name of its registered agent at such address is The Corporation Trust Company. THIRD:

November 12, 2014 8-K/A

Financial Statements and Exhibits

8-K/A 1 a14-2362818ka.htm AMENDMENT TO FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 28, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-254

November 12, 2014 EX-99.1

C O N T E N T S

Exhibit 99.1 SUMMIT WEST GROUP PROPERTIES FINANCIAL STATEMENTS JUNE 30, 2014 AND 2013 C O N T E N T S Page FINANCIAL STATEMENTS Statements of Direct Operating Revenues and Direct Operating Expenses (Unaudited) 2 Notes to Statements of Direct Operating Revenues and Direct Operating Expenses (Unaudited) 3 1 SUMMIT WEST GROUP PROPERTIES STATEMENTS OF DIRECT OPERATING REVENUES AND DIRECT OPERATING EXP

November 12, 2014 10-Q

ATHL / 10-Q - Quarterly Report - QUARTERLY REPORT PURSUANT TO SECTIONS 13 OR 15(D)

Table of Contents 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 Numbe

November 12, 2014 EX-99.2

C O N T E N T S

Exhibit 99.2 SUMMIT WEST GROUP PROPERTIES FINANCIAL STATEMENTS DECEMBER 31, 2013, 2012 AND 2011 C O N T E N T S Page INDEPENDENT AUDITOR’S REPORT 1 FINANCIAL STATEMENTS Statements of Direct Operating Revenues and Direct Operating Expenses 3 Notes to Statements of Direct Operating Revenues and Direct Operating Expenses 4 INDEPENDENT AUDITOR’S REPORT To Summit West Resources LP We have audited the a

November 12, 2014 EX-99.3

ATHLON ENERGY INC. UNAUDITED PRO FORMA FINANCIAL STATEMENTS

Exhibit 99.3 ATHLON ENERGY INC. UNAUDITED PRO FORMA FINANCIAL STATEMENTS INTRODUCTION Athlon Energy Inc. (“Athlon”), a Delaware corporation incorporated on April 1, 2013, is an independent exploration and production company focused on the acquisition, development, and exploitation of unconventional oil and liquids-rich natural gas reserves in the Permian Basin. On June 2, 2014, Athlon acquired cer

November 7, 2014 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): November 3, 2014 ATHLON ENERGY INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-36026 46-2549833 (State or Other Jurisdiction of Incorporation) (Commission Fil

November 4, 2014 SC 14D9/A

ATHL / SC 14D9/A - - AMENDMENT TO TENDER OFFER SOLICITATION / RECOMMENDATION STATEMENTS FILED UNDER RULE 14D-9

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 (Amendment No. 4) ATHLON ENERGY INC. (Name of Subject Company) ATHLON ENERGY INC. (Name of Person Filing Statement) Common Stock, par value $0.01 per share (Title of Class of Securities) 047477 104

November 3, 2014 SC TO-T/A

ECN / ENCANA CORP SC TO-T/A - - SC TO-T/A

SC TO-T/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 4) ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Persons) COMMON STOCK, $0.0

November 3, 2014 EX-99.(D)(8)

AMENDMENT TO THE AGREEMENT AND PLAN OF MERGER

EX-99.(D)(8) 4 d814843dex99d8.htm EX-99.(D)(8) Exhibit (d)(8) AMENDMENT TO THE AGREEMENT AND PLAN OF MERGER This Amendment (this “Amendment”) is made as of November 3, 2014 by and among Athlon Energy Inc., a Delaware corporation (the “Company”), Encana Corporation, a Canadian corporation (“Parent”), and Alenco Acquisition Company Inc., a Delaware corporation and indirect, wholly owned subsidiary o

November 3, 2014 EX-99.(A)(5)(XIV)

MEMORANDUM OF UNDERSTANDING

Exhibit (a)(5)(xiv) MEMORANDUM OF UNDERSTANDING WHEREAS, this Memorandum of Understanding (“MOU”) is entered into as of November 3, 2014, by and among the parties to the Actions (defined below) pending before the Court of Chancery of the State of Delaware (the “Court”) and the District Court of Tarrant County, Texas, to document their agreement-in-principle for the settlement of the Actions on the terms and subject to the conditions set forth herein; WHEREAS, on September 29, 2014, Athlon Energy Inc.

November 3, 2014 EX-99.(A)(5)(XIII)

Encana Announces Extension of the Tender Offer to Acquire Athlon Energy

EX-99.(a)(5)(xiii) Exhibit (a)(5)(xiii) Encana Announces Extension of the Tender Offer to Acquire Athlon Energy For Immediate Release Calgary, Alberta (November 3, 2014) Encana Corporation (Encana) (TSX, NYSE: ECA) today announced that the tender offer (the “Offer”) made by Encana’s indirect, wholly owned subsidiary to acquire all of the issued and outstanding shares of common stock of Athlon Ener

November 3, 2014 EX-99.(D)(9)

ENCANA CORPORATION ALENCO ACQUISITION COMPANY INC. Suite 4400, 500 Centre Street SE Calgary, Alberta Canada T2P 2S5 November 3, 2014

EX-99.(d)(9) Exhibit (d)(9) ENCANA CORPORATION ALENCO ACQUISITION COMPANY INC. Suite 4400, 500 Centre Street SE Calgary, Alberta Canada T2P 2S5 November 3, 2014 [Supporting Stockholder] [Supporting Stockholder Address] Dear [Supporting Stockholder]: Reference is made to that certain Tender Support Agreement, dated as of September 27, 2014 (the “Tender Support Agreement”), by and among you, Encana

October 29, 2014 SC 14D9/A

ATHL / SC 14D9/A - - AMENDMENT TO TENDER OFFER SOLICITATION / RECOMMENDATION STATEMENTS FILED UNDER RULE 14D-9

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 (Amendment No. 3) ATHLON ENERGY INC. (Name of Subject Company) ATHLON ENERGY INC. (Name of Person Filing Statement) Common Stock, par value $0.01 per share (Title of Class of Securities) 047477 104

October 28, 2014 SC TO-T/A

ECN / ENCANA CORP SC TO-T/A - - AMENDMENT NO. 3 TO SCHEDULE TO

Amendment No. 3 to Schedule TO UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 3) ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Person

October 28, 2014 EX-99.(A)(5)(XII)

IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE THE CITY OF CAMBRIDGE RETIREMENT SYSTEM on behalf of itself and on behalf of all others similarly situated, Plaintiff, C.A. No. v. ROBERT C. REEVES, GREGORY A. BEARD, RAKESH WILSON, WILSON B. HANDLER,

EX-99.(a)(5)(xii) Exhibit (a)(5)(xii) IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE THE CITY OF CAMBRIDGE RETIREMENT SYSTEM on behalf of itself and on behalf of all others similarly situated, Plaintiff, C.A. No. v. ROBERT C. REEVES, GREGORY A. BEARD, RAKESH WILSON, WILSON B. HANDLER, TED A. GARDNER, MARK A. STEVENS, BART KALSU, APOLLO GLOBAL MANAGEMENT, LLC, ENCANA CORPORATION, and ALENCO ACQU

October 20, 2014 EX-99.(A)(5)(X)

IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE ) ) MAXINE PHILLIPS, Individually and ) C.A. No. On Behalf of All Others Similarly ) Situated, ) ) CLASS ACTION Plaintiff, ) v. ) ) ATHLON ENERGY INC., ROBERT ) C. REEVES, GREGORY A. BEARD, ) WILSON B

EX-99.(A)(5)(X) 2 d806878dex99a5x.htm EXHIBIT (A)(5)(X) Exhibit (a)(5)(x) EFiled: Oct 17 2014 09:50AM EDT Transaction ID 56208240 Case No. 10246- IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE ) ) MAXINE PHILLIPS, Individually and ) C.A. No. On Behalf of All Others Similarly ) Situated, ) ) CLASS ACTION Plaintiff, ) v. ) ) ATHLON ENERGY INC., ROBERT ) C. REEVES, GREGORY A. BEARD, ) WILSON B. HA

October 20, 2014 SC TO-T/A

ECN / ENCANA CORP SC TO-T/A - - AMENDMENT NO. 2 TO SCHEDULE TO

Amendment No. 2 to Schedule TO UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 2) ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Person

October 20, 2014 EX-99.(A)(5)(XI)

IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE MANDLE ROUSSEAU, Individually C.A. No.: - and On Behalf of All Others Similarly Situated, Plaintiff, v. ATHLON ENERGY INC., ROBERT C. REEVES, GREGORY A. BEARD, RAKESH WILSON, TED A. GARDNER, WILSON B.

Exhibit (a)(5)(xi) Exhibit (a)(5)(xi) EFiled: Oct 17 2014 01:31PM EDT Transaction ID 56211471 Case No.

October 20, 2014 SC 14D9/A

ATHL / SC 14D9/A - - AMENDMENT TO TENDER OFFER SOLICITATION / RECOMMENDATION STATEMENTS FILED UNDER RULE 14D-9

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 (Amendment No. 2) ATHLON ENERGY INC. (Name of Subject Company) ATHLON ENERGY INC. (Name of Person Filing Statement) Common Stock, par value $0.01 per share (Title of Class of Securities) 047477 104

October 17, 2014 SC 14D9/A

ATHL / SC 14D9/A - - AMENDMENT TO TENDER OFFER SOLICITATION / RECOMMENDATION STATEMENTS FILED UNDER RULE 14D-9

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 (Amendment No. 1) ATHLON ENERGY INC. (Name of Subject Company) ATHLON ENERGY INC. (Name of Person Filing Statement) Common Stock, par value $0.01 per share (Title of Class of Securities) 047477 104

October 16, 2014 EX-99.(A)(5)(IX)

IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE GARY SHAYNE, individually and on ) behalf of all others similarly situated, ) ) Plaintiff, ) ) v. ) Civil Action No. ) ATHLON ENERGY, INC., ROBERT ) C. REEVES, GREGORY A. BEARD, ) RAKESH WILSON, TED A

EX-99.(a)(5)(ix) Exhibit (a)(5)(ix) EFiled: Oct 09 2014 06:25PM EDT Transaction ID 56173347 Case No. 10218- IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE GARY SHAYNE, individually and on ) behalf of all others similarly situated, ) ) Plaintiff, ) ) v. ) Civil Action No. ) ATHLON ENERGY, INC., ROBERT ) C. REEVES, GREGORY A. BEARD, ) RAKESH WILSON, TED A. ) GARDNER, WILSON B. HANDLER, ) MARK A.

October 16, 2014 SC TO-T/A

ECN / ENCANA CORP SC TO-T/A - - AMENDMENT NO. 1 TO SCHEDULE TO

Amendment No. 1 to Schedule TO UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No.1) ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Persons

October 10, 2014 EX-99.(E)(9)

Employment Agreement

EX-99.(e)(9) Exhibit (e)(9) Employment Agreement This Employment Agreement (the “Agreement”), dated as of August 7, 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and John C. Souders (the “Employee”) (collectively referred to herein as the “Parties”). RECITALS A. It is the desire of the Co

October 10, 2014 EX-99.(A)(1)(III)

NOTICE OF GUARANTEED DELIVERY For Tender of Shares of Common Stock ATHLON ENERGY INC. $58.50 Net per Share Pursuant to the Offer to Purchase dated October 10, 2014 ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORA

EX-99.(a)(1)(iii) Exhibit (a)(1)(iii) NOTICE OF GUARANTEED DELIVERY For Tender of Shares of Common Stock of ATHLON ENERGY INC. at $58.50 Net per Share Pursuant to the Offer to Purchase dated October 10, 2014 by ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORATION THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON NOVEMBER 7,

October 10, 2014 EX-99.(A)(1)(V)

Offer to Purchase for Cash All Outstanding Shares of Common Stock ATHLON ENERGY INC. $58.50 Net per Share Pursuant to the Offer to Purchase dated October 10, 2014 ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORAT

EX-99.(a)(1)(v) Exhibit (a)(1)(v) Offer to Purchase for Cash All Outstanding Shares of Common Stock of ATHLON ENERGY INC. at $58.50 Net per Share Pursuant to the Offer to Purchase dated October 10, 2014 by ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORATION THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON NOVEMBER 7, 2014

October 10, 2014 EX-99.(D)(2)

ATHLON ENERGY INC. 420 Throckmorton Street, Suite 1200 Fort Worth, Texas 76102 CONFIDENTIALITY AGREEMENT

EX-99.(d)(2) Exhibit (d)(2) ATHLON ENERGY INC. 420 Throckmorton Street, Suite 1200 Fort Worth, Texas 76102 CONFIDENTIALITY AGREEMENT September 5, 2014 Encana Corporation Suite 4400, 500 Centre Street S.E. Calgary, Alberta T2P 4S5 Attention: Douglas J. Suttles, President & Chief Executive Officer Dear Mr. Suttles: You have requested certain non-public information regarding Athlon Energy Inc. (the “

October 10, 2014 EX-99.(A)(1)(IV)

Offer To Purchase For Cash All Outstanding Shares of Common Stock ATHLON ENERGY INC. $58.50 Net per Share Pursuant to the Offer to Purchase dated October 10, 2014 ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORAT

EX-99.(a)(1)(iv) Exhibit (a)(1)(iv) Offer To Purchase For Cash All Outstanding Shares of Common Stock of ATHLON ENERGY INC. at $58.50 Net per Share Pursuant to the Offer to Purchase dated October 10, 2014 by ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORATION THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON NOVEMBER 7, 201

October 10, 2014 EX-99.(E)(12)

ATHLON ENERGY INC. 2013 INCENTIVE AWARD PLAN RESTRICTED STOCK GRANT NOTICE

EX-99.(E)(12) 4 d802016dex99e12.htm EX-99.(E)(12) Exhibit (e)(12) ATHLON ENERGY INC. 2013 INCENTIVE AWARD PLAN RESTRICTED STOCK GRANT NOTICE Athlon Energy Inc., a Delaware corporation (the “Company”), pursuant to its 2013 Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”) the number of shares of Restricted Stock (the “Shares”)

October 10, 2014 EX-99.(A)(5)(VII)

SHAREHOLDER DERIVATIVE AND CLASS ACTION PETITION

Exhibit (a)(5)(vii) FILED TARRANT COUNTY 10/6/2014 3:06:39 PM Cause No. 342-274894-14 THOMAS A. WILDER DISTRICT CLERK MATT YOUDALL, Individually and on § IN THE DISTRICT COURT OF TARRANT COUNTY, TEXAS JUDICIAL DISTRICT Behalf of All Others Similarly Situated and § Derivatively on Behalf of ATHLON ENERGY INC., § § § Plaintiff, § § vs. § § ENCANA CORPORATION, ALENCO § ACQUISITION COMPANY INC., ROBER

October 10, 2014 EX-99.(A)(1)(II)

LETTER OF TRANSMITTAL To Tender Shares of Common Stock ATHLON ENERGY INC. $58.50 Net per Share Pursuant to the Offer to Purchase dated October 10, 2014 ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORATION

EX-99.(a)(1)(ii) Exhibit (a)(1)(ii) LETTER OF TRANSMITTAL To Tender Shares of Common Stock of ATHLON ENERGY INC. at $58.50 Net per Share Pursuant to the Offer to Purchase dated October 10, 2014 by ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORATION THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON NOVEMBER 7, 2014 (ONE MINU

October 10, 2014 EX-99.(A)(1)(I)

Offer to Purchase for Cash All Outstanding Shares of Common Stock ATHLON ENERGY INC. $58.50 Net per Share ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORATION

EX-99.(a)(1)(i) Table of Contents Exhibit (a)(1)(i) Offer to Purchase for Cash All Outstanding Shares of Common Stock of ATHLON ENERGY INC. at $58.50 Net per Share by ALENCO ACQUISITION COMPANY INC., an indirect wholly owned subsidiary of ENCANA CORPORATION THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON NOVEMBER 7, 2014 (ONE MINUTE AFTER 11:59 P.M., NEW YORK

October 10, 2014 EX-99.(A)(1)(VI)

This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below). The Offer (as defined below) is made solely by the Offer to Purchase (as defined below) and the related Letter of Transmittal (as defi

EX-99.(a)(1)(vi) Exhibit (a)(1)(vi) This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below). The Offer (as defined below) is made solely by the Offer to Purchase (as defined below) and the related Letter of Transmittal (as defined below) and any amendments or supplements thereto. The Offer is not being made to (and no tenders will be accep

October 10, 2014 EX-99.(E)(5)

Employment Agreement

EX-99.(E)(5) 2 d802016dex99e5.htm EX-99.(E)(5) Exhibit (e)(5) Employment Agreement This Employment Agreement (the “Agreement”), dated as of August 7, 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and Jennifer L. Palko (the “Employee”) (collectively referred to herein as the “Parties”). RE

October 10, 2014 EX-99.(D)(4)

TENDER SUPPORT AGREEMENT

EX-99.(d)(4) Exhibit (d)(4) TENDER SUPPORT AGREEMENT This TENDER SUPPORT AGREEMENT (this “Agreement”), dated as of September 27, 2014, is entered into by and among Encana Corporation, a Canadian corporation (“Parent”), Alenco Acquisition Company Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Acquisition Sub”), and the individual set forth on Schedule A (“Stockholder”). WHER

October 10, 2014 EX-99.(D)(5)

NON-EXCHANGE AGREEMENT

EX-99.(d)(5) Exhibit (d)(5) NON-EXCHANGE AGREEMENT This NON-EXCHANGE AGREEMENT (this “Agreement”), dated as of September 27, 2014, is entered into by and among Encana Corporation, a Canadian corporation (“Parent”), Alenco Acquisition Company Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Acquisition Sub”), the individual set forth on Schedule A (“Partner”), and Athlon Energ

October 10, 2014 EX-99.(D)(3)

TENDER SUPPORT AGREEMENT

EX-99.(d)(3) Exhibit (d)(3) TENDER SUPPORT AGREEMENT This TENDER SUPPORT AGREEMENT (this “Agreement”), dated as of September 27, 2014, is entered into by and among Encana Corporation, a Canadian corporation (“Parent”), Alenco Acquisition Company Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Acquisition Sub”), and the entity set forth on Schedule A (“Stockholder”). WHEREAS,

October 10, 2014 EX-99.(A)(5)(VIII)

Encana commences cash tender offer for shares of Athlon Energy

EX-99.(a)(5)(viii) Exhibit (a)(5)(viii) news release Encana commences cash tender offer for shares of Athlon Energy For Immediate Release Calgary, Alberta (October 10, 2014) Encana Corporation (Encana) (TSX, NYSE: ECA) today commenced its tender offer (the “Offer”) for all of the issued and outstanding shares of Athlon Energy Inc. (Athlon) at a price of US$58.50 per share, net to the seller in cas

October 10, 2014 SC 14D9

ATHL / SC 14D9 - - SCHEDULE 14D-9

SC 14D9 1 d802016dsc14d9.htm SCHEDULE 14D-9 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 ATHLON ENERGY INC. (Name of Subject Company) ATHLON ENERGY INC. (Name of Person Filing Statement) Common Stock, par value $0.01 per shar

October 10, 2014 SC TO-T

ECN / ENCANA CORP SC TO-T - - SCHEDULE TO

Schedule TO UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Persons) COMMON STOCK, $0.01 PAR VALUE (Tit

October 2, 2014 EX-99.1

Encana announces transformative acquisition of Athlon Energy to establish a premier oil position in the Permian

Exhibit 99.1 news release Encana announces transformative acquisition of Athlon Energy to establish a premier oil position in the Permian Calgary, Alberta (September 29, 2014) Encana Corporation (Encana) (TSX, NYSE: ECA) and Athlon Energy Inc. (Athlon) (NYSE:ATHL) today jointly announced that the two companies have entered into a definitive merger agreement for Encana to acquire all of the issued

October 2, 2014 SC14D9C

ATHL / SC14D9C - - WRITTEN COMMUNICATION BY THE SUBJECT COMPANY RELATING TO A THIRD PARTY TENDER OFFER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 ATHLON ENERGY INC. (Name of Subject Company) ATHLON ENERGY INC. (Name of Person Filing Statement) Common Stock, par value $0.01 per share (Title of Class of Securities) 047477104 (CUSIP Number of Class of Securiti

October 2, 2014 EX-10.2

AMENDMENT TO EMPLOYMENT AGREEMENT

Exhibit 10.2 AMENDMENT TO EMPLOYMENT AGREEMENT This AMENDMENT (this “Amendment”) to the Employment Agreement, dated as of August 7, 2013 (the “Employment Agreement”), between Athlon Holdings LP (the “Company”), and (“Employee”), is dated as of September 27, 2014, and is effective as of the Closing (as defined in the Merger Agreement). WHEREAS, in connection with that certain Merger Agreement by an

October 2, 2014 EX-10.1

AMENDMENT TO EMPLOYMENT AGREEMENT

Exhibit 10.1 AMENDMENT TO EMPLOYMENT AGREEMENT This AMENDMENT (this “Amendment”) to the Employment Agreement, dated as of August 7, 2013 (the “Employment Agreement”), between Athlon Holdings LP (the “Company”), and (“Executive”), is dated as of September 27, 2014, and is effective as of the Closing (as defined in the Merger Agreement). WHEREAS, in connection with that certain Merger Agreement by a

October 2, 2014 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, 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 27, 2014 ATHLON ENERGY INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-36026 46-2549833 (State or Other Jurisdiction of Incorporation) (Commission F

October 2, 2014 EX-2.1

AGREEMENT AND PLAN OF MERGER BY AND AMONG ENCANA CORPORATION, ALENCO ACQUISITION COMPANY INC. ATHLON ENERGY INC. September 27, 2014

Exhibit 2.1 EXECUTION COPY AGREEMENT AND PLAN OF MERGER BY AND AMONG ENCANA CORPORATION, ALENCO ACQUISITION COMPANY INC. AND ATHLON ENERGY INC. September 27, 2014 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS 2 Section 1.01 Definitions 2 Section 1.02 Definitional and Interpretative Provisions 14 ARTICLE II THE OFFER 16 Section 2.01 The Offer 16 Section 2.02 Company Actions 18 Section 2.03 Director

October 1, 2014 EX-99.1

CORPORATE PRESENTATION

EX-99.1 Exhibit 99.1 CORPORATE PRESENTATION Encana Corporation October 2014 Business Strategy Getting Back to Winning VISION: LEADING NORTH AMERICAN RESOURCE PLAY COMPANY STRATEGY: DISCIPLINED FOCUS ON GENERATING PROFITABLE GROWTH GOAL: GROWING SHAREHOLDER VALUE 2017 Balanced liquids and natural gas Growth from a limited number of high quality assets Industry leading efficiency 2013 2017 Strategy

October 1, 2014 SC TO-C

ECN / ENCANA CORP SC TO-C - - SCHEDULE TO-C

Schedule TO-C UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Persons) COMMON STOCK, $0.01 PAR VALUE (T

September 30, 2014 EX-99.2

MARKETWIRED Moderator: Simon Scott September 29, 2014 9:45 a.m. ET Operator: Good day, ladies and gentlemen, and thank you for standing by. Welcome to the Encana Corporation’s corporate announcement conference call for media. As a reminder, today’s c

Exhibit 99.2 MARKETWIRED Moderator: Simon Scott 09-29-14/9:45 a.m. ET Confirmation # 12810602 Page 1 Disclaimer The tender offer (the “Offer”) described in this communication has not yet commenced, and this communication is neither an offer to purchase nor a solicitation of an offer to sell any shares of the common stock of Athlon Energy Inc. (“Athlon”) or any other securities. On the commencement

September 30, 2014 EX-99.1

MARKETWIRED Moderator: Brian Dutton September 29, 2014 8:00 a.m. ET

EX-99.1 2 d795962dex991.htm EX-99.1 Exhibit 99.1 MARKETWIRED Moderator: Brian Dutton 09-29-14/8:00 a.m. ET Confirmation # 12810601 Page 1 Disclaimer The tender offer (the “Offer”) described in this communication has not yet commenced, and this communication is neither an offer to purchase nor a solicitation of an offer to sell any shares of the common stock of Athlon Energy Inc. (“Athlon”) or any

September 30, 2014 EX-99.3

VIDEO – ANNOUNCEMENT OF ATHLON ACQUISITION

EX-99.3 Exhibit 99.3 Disclaimer The tender offer (the “Offer”) described in this communication has not yet commenced, and this communication is neither an offer to purchase nor a solicitation of an offer to sell any shares of the common stock of Athlon Energy Inc. (“Athlon”) or any other securities. On the commencement date of the Offer, a tender offer statement on Schedule TO, including an offer

September 30, 2014 SC TO-C

ECN / ENCANA CORP SC TO-C - - SCHEDULE TO-C

Schedule TO-C UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Persons) COMMON STOCK, $0.01 PAR VALUE (T

September 29, 2014 EX-99.1

Encana announces transformative acquisition of Athlon Energy to establish a premier oil position in the Permian

EXHIBIT 99.1 Encana announces transformative acquisition of Athlon Energy to establish a premier oil position in the Permian Calgary, Alberta (September 29, 2014) Encana Corporation (Encana) (TSX, NYSE: ECA) and Athlon Energy Inc. (Athlon) (NYSE: ATHL) today jointly announced that the two companies have entered into a definitive merger agreement for Encana to acquire all of the issued and outstand

September 29, 2014 SC TO-C

ECN / ENCANA CORP SC TO-C - - SCHEDULE TO-C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ATHLON ENERGY INC. (Name of Subject Company) ALENCO ACQUISITION COMPANY INC. (Offeror) ENCANA CORPORATION (Parent of Offeror) (Names of Filing Persons) COMMON STOCK, $0.01 PAR VALUE (Title of Class

September 29, 2014 EX-99.2

Investor Presentation, dated September 29, 2014.

EXHIBIT 99.2 TRANSFORMATIONAL ENTRY INTO THE PERMIAN BASIN Encana Corporation Doug Suttles President & CEO September 29, 2014 Athlon Energy – The Best of the Permian Transformative Acquisition in World Class Basin • $7.1B acquisition of Athlon Energy Inc. – $5.93B cash plus assumption of $1.15B of long - term debt – Midland Basin pure play, headquartered in Fort Worth, TX – Expected to close by ye

September 4, 2014 EX-99.1

ATHLON ENERGY PROVIDES OPERATIONAL UPDATE

Exhibit 99.1 ATHLON ENERGY PROVIDES OPERATIONAL UPDATE FORT WORTH, Texas—(BUSINESS WIRE)—September 2, 2014 Athlon Energy (NYSE: ATHL) (“Athlon” or the “Company”) today provided an operational update. Athlon’s Howard County horizontal well, Tubb 39 #5H (100% WI) was successfully drilled and completed using a 30-stage hybrid fracture stimulation over a perforated lateral length of 6,705 ft. in the W

September 4, 2014 8-K

Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

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 28, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incor

September 4, 2014 EX-2.1

PURCHASE AND SALE AGREEMENT

Exhibit 2.1 EXECUTION VERSION PURCHASE AND SALE AGREEMENT TABLE OF CONTENTS Page ARTICLE 1 RECITALS 1 ARTICLE 2 PURCHASE AND SALE 1 2.1. Purchase and Sale 1 2.2. Properties Defined 1 2.3. Effective Time 3 2.4. Oil in Storage 3 ARTICLE 3 PURCHASE PRICE 3 3.1. Purchase Price and Other Consideration; Allocations 3 ARTICLE 4 TITLE & ENVIRONMENTAL 6 4.1. General Access 6 4.2. Sellers’ Title 6 4.3. Titl

September 4, 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): September 2, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inc

August 13, 2014 8-K

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

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 12, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incor

August 13, 2014 EX-99.1

ATHLON ENERGY ANNOUNCES SECOND QUARTER 2014 FINANCIAL RESULTS, NORTHERN MIDLAND BASIN ACQUISITIONS, INCREASED OUTLOOK, & EXECUTIVE PROMOTIONS

Exhibit 99.1 ATHLON ENERGY ANNOUNCES SECOND QUARTER 2014 FINANCIAL RESULTS, NORTHERN MIDLAND BASIN ACQUISITIONS, INCREASED OUTLOOK, & EXECUTIVE PROMOTIONS FORT WORTH, Texas—(BUSINESS WIRE)—August 12, 2014 Athlon Energy (NYSE: ATHL) (“Athlon” or the “Company”) today reported record second quarter 2014 financial results, announced additional acquisitions in the core of the northern Midland Basin, in

August 12, 2014 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): August 6, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorp

August 4, 2014 EX-1.1

Athlon Energy Inc. 12,500,000 Shares Common Stock ($0.01 par value) Underwriting Agreement

Exhibit 1.1 Athlon Energy Inc. 12,500,000 Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York July 31, 2014 Citigroup Global Markets Inc. Goldman, Sachs & Co. As Representatives of the several Underwriters, c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Certain stockholders named on Schedule I hereto (the “Selling S

August 4, 2014 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 31, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorpo

August 1, 2014 424B4

12,500,000 Shares Athlon Energy Inc. Common Stock $46.25 per share

Use these links to rapidly review the document TABLE OF CONTENTS Filed Pursuant to Rule 424(b)(4) Registration No.

July 30, 2014 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorpo

July 30, 2014 EX-1.1

Athlon Energy Inc. 12,500,000 Shares Common Stock ($0.01 par value) Underwriting Agreement

Exhibit 1.1 Athlon Energy Inc. 12,500,000 Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York , 2014 Citigroup Global Markets Inc. Goldman, Sachs & Co. As Representatives of the several Underwriters, c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Certain stockholders named on Schedule I hereto (the “Selling Stockhol

July 30, 2014 CORRESP

ATHL / CORRESP - -

July 30, 2014 U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attention: Anne Nguyen Parker Division of Corporate Finance Re: Athlon Energy Inc. Registration Statement on Form S-1 (File No. 333-196823) Ladies and Gentlemen: As the representatives of the several underwriters of the Athlon Energy Inc. (the “Company”) proposed pub

July 30, 2014 CORRESP

ATHL / CORRESP - -

Athlon Energy Inc. 420 Throckmorton Street, Suite 1200 Fort Worth, Texas 76102 (817) 984-8200 July 30, 2014 Via Edgar Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attn: Anne Nguyen Parker, Branch Chief Re: Athlon Energy Inc. Registration Statement on Form S-1 File No. 333-196823 Ladies and Gentlemen: Athlon Energy Inc. (the “Comp

July 30, 2014 S-1/A

ATHL / S-1/A - - S-1/A

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on July 30, 2014 Registration No.

July 30, 2014 EX-99.1

ATHLON ENERGY ANNOUNCES SECOND QUARTER 2014 PRODUCTION, HORIZONTAL WELL RESULT & BOARD APPOINTMENT

Exhibit 99.1 ATHLON ENERGY ANNOUNCES SECOND QUARTER 2014 PRODUCTION, HORIZONTAL WELL RESULT & BOARD APPOINTMENT FORT WORTH, Texas—(BUSINESS WIRE)—July 30, 2014 Athlon Energy (NYSE: ATHL) (“Athlon” or the “Company”) today announced second quarter 2014 production, the initial production results on its second horizontal well in Howard County, and the appointment of Bart Kalsu as an independent direct

July 25, 2014 CORRESP

ATHL / CORRESP - -

811 Main Street, Suite 3700 Houston, TX 77002 Tel: +1.713.546.5400 Fax: +1.713.546.5401 www.lw.com FIRM / AFFILIATE OFFICES Abu Dhabi Milan Barcelona Moscow Beijing Munich Boston New Jersey Brussels New York Chicago Orange County July 25, 2014 Doha Paris Dubai Riyadh Düsseldorf Rome Frankfurt San Diego Hamburg San Francisco Via EDGAR Hong Kong Shanghai Houston Silicon Valley Securities and Exchang

July 22, 2014 EX-99.5

ATHLON ENERGY INC. UNAUDITED PRO FORMA FINANCIAL STATEMENTS

Exhibit 99.5 ATHLON ENERGY INC. UNAUDITED PRO FORMA FINANCIAL STATEMENTS INTRODUCTION Athlon Energy Inc. (“Athlon”), a Delaware corporation incorporated on April 1, 2013, is an independent exploration and production company focused on the acquisition, development, and exploitation of unconventional oil and liquids-rich natural gas reserves in the Permian Basin. On June 2, 2014 and June 3, 2014, At

July 22, 2014 8-K/A

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 2) 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 2, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS

July 22, 2014 CORRESP

ATHL / CORRESP - -

811 Main Street, Suite 3700 Houston, TX 77002 Tel: +1.713.546.5400 Fax: +1.713.546.5401 www.lw.com FIRM / AFFILIATE OFFICES Abu Dhabi Milan Barcelona Moscow Beijing Munich Boston New Jersey Brussels New York Chicago Orange County July 22, 2014 Doha Paris Dubai Riyadh Düsseldorf Rome Frankfurt San Diego Hamburg San Francisco Via EDGAR Hong Kong Shanghai Houston Silicon Valley Securities and Exchang

July 11, 2014 CORRESP

ATHL / CORRESP - -

begin 644 filename2.pdf M)5!$1BTQ+C8-)>+CS],-"C$R."`P(&]B:@T\/"]&:6QT97(O1FQA=&5$96-O M9&4O1FER<&4O3V)J4W1M/CYS=')E M86T-"FC>S);=BMLP$(5?99Y@K=^1!$LNFC:]*(7@^"Z$$K*F+)1UL+V0OGV/ M+=F;S:;)0MID;^R#/!K-?-*,'$B0M*2\)R7).@E)GB5I2U*:0$:2-$J3<20Y M.+**9&`!4U+*8K)@4M9T`BZLQS012#$;NK/IM536SZU#0:Q4)Y-ZVK[J=HM MQ1TFL,*39?<,UMR)5?:]?'A<]]^IX)IPJ^R^;J&D]YQYR0OF^JYWI0-%OBR M:[\NVG5;0N>RBS6:("?/20:"IUXJ00BPETA'=

July 11, 2014 CORRESP

ATHL / CORRESP - -

811 Main Street, Suite 3700 Houston, TX 77002 Tel: +1.713.546.5400 Fax: +1.713.546.5401 www.lw.com FIRM / AFFILIATE OFFICES Abu Dhabi Milan Barcelona Moscow Beijing Munich Boston New Jersey Brussels New York Chicago Orange County Doha Paris Dubai Riyadh Düsseldorf Rome Frankfurt San Diego Hamburg San Francisco Hong Kong Shanghai Houston Silicon Valley London Singapore Los Angeles Tokyo Madrid Wash

June 27, 2014 S-4/A

- S-4/A

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on June 27, 2014 Registration No.

June 27, 2014 EX-12.1

ATHLON HOLDINGS LP RATIOS OF EARNINGS TO FIXED CHARGES (in thousands, except ratios)

QuickLinks - Click here to rapidly navigate through this document Exhibit 12.1 ATHLON HOLDINGS LP RATIOS OF EARNINGS TO FIXED CHARGES (in thousands, except ratios) Historical Three months ended March 31, Year ended December 31, 2014 2013 2013 2012 2011 Fixed charges: Interest expense $ 9,178 4,474 $ 36,669 $ 9,951 $ 2,945 Capitalized interest 1,214 42 343 219 — Rental expense attributable to inter

June 17, 2014 S-1

Registration Statement - S-1

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on June 17, 2014 Registration No.

June 17, 2014 EX-10.7

Employment Agreement

Exhibit 10.7 Employment Agreement This Employment Agreement (the “Agreement”), dated as of August 7, 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and Bud W. Holmes (the “Employee”) (collectively referred to herein as the “Parties”). RECITALS A. It is the desire of the Company to assure i

June 17, 2014 EX-10.17

ATHLON ENERGY INC. 2013 INCENTIVE AWARD PLAN RESTRICTED STOCK GRANT NOTICE

Exhibit 10.17 ATHLON ENERGY INC. 2013 INCENTIVE AWARD PLAN RESTRICTED STOCK GRANT NOTICE Athlon Energy Inc., a Delaware corporation (the “Company”), pursuant to its 2013 Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”) the number of shares of Restricted Stock (the “Shares”) set forth below. The Shares are subject to the terms

June 17, 2014 EX-21.1

Subsidiaries of Athlon Energy Inc.

QuickLinks - Click here to rapidly navigate through this document Exhibit 21.1 Subsidiaries of Athlon Energy Inc. Name of Subsidiary State or other Jurisdiction of Incorporation or Organization Athlon Holdings GP LLC Delaware Athlon Holdings LP Delaware Athlon Finance Corp. Delaware QuickLinks Exhibit 21.1 Subsidiaries of Athlon Energy Inc.

June 16, 2014 EX-99.5

ATHLON ENERGY INC. UNAUDITED PRO FORMA FINANCIAL STATEMENTS

Exhibit 99.5 ATHLON ENERGY INC. UNAUDITED PRO FORMA FINANCIAL STATEMENTS INTRODUCTION Athlon Energy Inc. (“Athlon”), a Delaware corporation incorporated on April 1, 2013, is an independent exploration and production company focused on the acquisition, development, and exploitation of unconventional oil and liquids-rich natural gas reserves in the Permian Basin. On June 2, 2014 and June 3, 2014, At

June 16, 2014 8-K/A

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 2, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS

June 16, 2014 EX-99.2

PIEDRA ENERGY II, LLC SCHEDULE OF DIRECT OPERATING REVENUES AND DIRECT OPERATING EXPENSES

Exhibit 99.2 PIEDRA ENERGY II, LLC SCHEDULE OF DIRECT OPERATING REVENUES AND DIRECT OPERATING EXPENSES THREE MONTHS ENDED MARCH 31, 2014 2013 DIRECT OPERATING REVENUES $ 8,450,627 $ 6,028,916 DIRECT OPERATING EXPENSES 1,009,579 653,672 DIRECT OPERATING REVENUES IN EXCESS OF DIRECT OPERATING EXPENSES $ 7,441,048 $ 5,375,244 See accompanying Notes to Schedule of Direct Operating Revenues and Direct

June 16, 2014 EX-99.3

C O N T E N T S

Exhibit 99.3 HIBERNIA ENERGY, LLC AND SUBSIDIARIES CONSOLIDATED FINANCIAL REPORT DECEMBER 31, 2013 C O N T E N T S Page INDEPENDENT AUDITOR’S REPORT 2 FINANCIAL STATEMENTS Consolidated Balance Sheet 3 Consolidated Statement of Operations 5 Consolidated Statement of Members’ Equity 6 Consolidated Statement of Cash Flows 7 Notes to Consolidated Financial Statements 9 INDEPENDENT AUDITOR’S REPORT To

June 16, 2014 EX-99.1

HIBERNIA ENERGY, LLC AND SUBSIDIARIES CONSOLIDATED FINANCIAL REPORT FOR THE QUARTER ENDING MARCH 31, 2014

Exhibit 99.1 HIBERNIA ENERGY, LLC AND SUBSIDIARIES CONSOLIDATED FINANCIAL REPORT FOR THE QUARTER ENDING MARCH 31, 2014 CONTENTS Page FINANCIAL STATEMENTS Consolidated Balance Sheets 3 Consolidated Statements of Operations 5 Consolidated Statements of Members’ Equity 6 Consolidated Statements of Cash Flows 7 Notes to Consolidated Financial Statements 9 2 HIBERNIA ENERGY, LLC AND SUBSIDIARIES CONSOL

June 5, 2014 8-K

Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 2, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorpor

June 5, 2014 EX-2.1

PURCHASE AND SALE AGREEMENT BY AND AMONG HIBERNIA HOLDINGS, LLC HIBERNIA RESOURCES, LLC AS SELLERS ATHLON HOLDINGS LP AS BUYER

Exhibit 2.1 EXECUTION COPY PURCHASE AND SALE AGREEMENT BY AND AMONG HIBERNIA HOLDINGS, LLC AND HIBERNIA RESOURCES, LLC AS SELLERS AND ATHLON HOLDINGS LP AS BUYER TABLE OF CONTENTS Page ARTICLE I DEFINITIONS 1 Section 1.01 Defined Terms 1 Section 1.02 Interpretation 13 ARTICLE II ASSETS 13 Section 2.01 Agreement to Sell and Purchase 13 Section 2.02 Assets 14 Section 2.03 Excluded and Reserved Asset

June 5, 2014 EX-2.2

PURCHASE AND SALE AGREEMENT BY AND AMONG PIEDRA ENERGY II, LLC, PIEDRA OPERATING, LLC THE OTHER SELLERS LISTED ON THE SIGNATURE PAGES HERETO AS SELLERS ATHLON HOLDINGS LP AS BUYER

Exhibit 2.2 EXECUTION COPY PURCHASE AND SALE AGREEMENT BY AND AMONG PIEDRA ENERGY II, LLC, PIEDRA OPERATING, LLC AND THE OTHER SELLERS LISTED ON THE SIGNATURE PAGES HERETO AS SELLERS AND ATHLON HOLDINGS LP AS BUYER TABLE OF CONTENTS Page ARTICLE I DEFINITIONS 1 Section 1.01 Defined Terms 1 Section 1.02 Interpretation 13 ARTICLE II ASSETS 13 Section 2.01 Agreement to Sell and Purchase 13 Section 2.

May 30, 2014 8-K

Submission of Matters to a Vote of Security Holders - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 29, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction of incorporation) (Commission File Nu

May 7, 2014 EX-99.1

ATHLON ENERGY ANNOUNCES FIRST QUARTER 2014 FINANCIAL RESULTS

Exhibit 99.1 ATHLON ENERGY ANNOUNCES FIRST QUARTER 2014 FINANCIAL RESULTS FORT WORTH, Texas—(BUSINESS WIRE)—May 6, 2014 Athlon Energy (NYSE: ATHL) (“Athlon” or the “Company”) today reported record first quarter 2014 financial results. Company Highlights · Adjusted EBITDA increased 94% to $79.0 million for the first quarter 2014 as compared to $40.7 million for the first quarter 2013. · Discretiona

May 7, 2014 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 6, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorpora

May 2, 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

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, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorpora

May 2, 2014 EX-4.1

ATHLON HOLDINGS LP

Exhibit 4.1 EXECUTION VERSION ATHLON HOLDINGS LP and ATHLON FINANCE CORP. as Issuers and the Guarantors party hereto from time to time 6.000% Senior Notes due 2022 INDENTURE Dated as of May 1, 2014 and Wells Fargo Bank, National Association as Trustee 1 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE SECTION 1.01 Definitions 1 SECTION 1.02 Other Definitions 44 SECTION 1

April 29, 2014 DEF 14A

- DEF 14A

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

April 28, 2014 EX-99.1

JOINT FILING AGREEMENT

EXHIBIT 99.1 JOINT FILING AGREEMENT The undersigned hereby agree that the Statement on Schedule 13G filed herewith (and any amendments thereto), relating to the Common Stock of Athlon Energy Inc., a Delaware corporation, is being filed jointly with the Securities and Exchange Commission pursuant to Rule 13d-1(c) under the Securities Exchange Act of 1934, as amended, on behalf of each of the unders

April 28, 2014 SC 13G

ATHL / / CITADEL ADVISORS LLC - FORM SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 and 13d-2 Under the Securities Exchange Act of 1934 (Amendment No. )* Athlon Energy Inc. (Name of Issuer) Common stock, par value $0.01 per share (Title of Class of Securities) 047477104 (CUSIP Number) April 17, 2014 Date of Event Which Requires Filing o

April 25, 2014 EX-25.1

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE x CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT T

Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE x CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b) (2) WELLS FARGO BANK, NATIONAL ASSOCIATION (Exact name of trustee as specified in its charter) A National Banking Associ

April 25, 2014 EX-3.4

ATHLON FINANCE CORP. ARTICLE I Meetings of Stockholders

Exhibit 3.4 BYLAWS OF ATHLON FINANCE CORP. ARTICLE I Meetings of Stockholders Section 1.1. Annual Meetings. If required by applicable law, an annual meeting of stockholders shall be held for the election of directors at such date, time and place, if any, either within or without the State of Delaware, as may be designated by resolution of the Board of Directors from time to time. Any other proper

April 25, 2014 EX-3.3

CERTIFICATE OF INCORPORATION ATHLON FINANCE CORP. April 1, 2013

Exhibit 3.3 CERTIFICATE OF INCORPORATION OF ATHLON FINANCE CORP. April 1, 2013 I, the undersigned, for the purposes of incorporating and organizing a corporation under the General Corporation Law of the State of Delaware, do execute this Certificate of Incorporation and do hereby certify as follows: FIRST. The name of the corporation is Athlon Finance Corp. SECOND. The address of the corporation’s

April 25, 2014 EX-21.1

Subsidiaries of Athlon Holdings LP

QuickLinks - Click here to rapidly navigate through this document Exhibit 21.1 Subsidiaries of Athlon Holdings LP Name of Subsidiary State or other Jurisdiction of Incorporation or Organization Athlon Finance Corp. Delaware QuickLinks Exhibit 21.1 Subsidiaries of Athlon Holdings LP

April 25, 2014 EX-3.1

CERTIFICATE OF LIMITED PARTNERSHIP ATHLON HOLDINGS LP

Exhibit 3.1 CERTIFICATE OF LIMITED PARTNERSHIP OF ATHLON HOLDINGS LP This Certificate of Limited Partnership, dated July 22, 2011, has been duly executed and is filed pursuant to Section 17-201 of the Delaware Revised Uniform Limited Partnership Act (the “Act”) to form a limited partnership under the Act. 1. Name. The name of the limited partnership is Athlon Holdings LP. 2. Registered Office; Reg

April 25, 2014 EX-12.1

ATHLON HOLDINGS LP RATIOS OF EARNINGS TO FIXED CHARGES (in thousands, except ratios)

QuickLinks - Click here to rapidly navigate through this document Exhibit 12.1 ATHLON HOLDINGS LP RATIOS OF EARNINGS TO FIXED CHARGES (in thousands, except ratios) Year ended December 31, 2013 2012 2011 Fixed charges: Interest expense $ 36,669 $ 9,951 $ 2,945 Capitalized interest 343 219 — Rental expense attributable to interest 49 51 27 Total fixed charges $ 37,061 $ 10,221 $ 2,972 Earnings: Inco

April 25, 2014 S-4

- S-4

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on April 25, 2014 Registration No.

April 21, 2014 EX-1.1

Athlon Energy Inc. 12,875,000 Shares Common Stock ($0.01 par value) Underwriting Agreement

Exhibit 1.1 Execution Version Athlon Energy Inc. 12,875,000 Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York April 16, 2014 Citigroup Global Markets Inc. Goldman, Sachs & Co. As Representatives of the several Underwriters, c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Athlon Energy Inc., a corporation organized

April 21, 2014 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 16, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorp

April 21, 2014 EX-1.2

Athlon Holdings LP Athlon Finance Corp. $650,000,000 6.000% Senior Notes due 2022 Purchase Agreement

Exhibit 1.2 Execution Version Athlon Holdings LP Athlon Finance Corp. $650,000,000 6.000% Senior Notes due 2022 Purchase Agreement New York, New York April 16, 2014 Citigroup Global Markets Inc. As Representative of the several Underwriters, 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Athlon Holdings LP, a Delaware limited partnership (the “Partnership”), and Athlon Finance

April 18, 2014 424B4

12,875,000 Shares Athlon Energy Inc. Common Stock $40.00 per share

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents Filed Pursuant to Rule 424(b)(4) Registration No.

April 16, 2014 S-1MEF

- REGISTRATION STMT TO ADD SECURITIES TO A PRIOR RELATED EFFECTIVE REGISTRATION STMT.

As filed with the Securities and Exchange Commission on April 16, 2014 Registration No.

April 15, 2014 EX-99.1

ATHLON ENERGY ANNOUNCES FIRST QUARTER 2014 PRODUCTION, HORIZONTAL WELL RESULTS & INCREASED 2014 OUTLOOK

Exhibit 99.1 ATHLON ENERGY ANNOUNCES FIRST QUARTER 2014 PRODUCTION, HORIZONTAL WELL RESULTS & INCREASED 2014 OUTLOOK FORT WORTH, Texas—(BUSINESS WIRE)—April 15, 2014—Athlon Energy (NYSE: ATHL) (“Athlon”, or the “Company”) today announced first quarter 2014 production, horizontal well results, and increased 2014 outlook. First Quarter 2014 Production: Athlon’s average daily production volumes for t

April 15, 2014 SC 13G

ATHL / / CITADEL ADVISORS LLC - SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 and 13d-2 Under the Securities Exchange Act of 1934 (Amendment No. )* Athlon Energy Inc. (Name of Issuer) Common stock, par value $0.01 per share (Title of Class of Securities) 047477104 (CUSIP Number) February 7, 2014 Date of Event Which Requires Filing

April 15, 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): April 11, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorp

April 15, 2014 EX-1.1

Athlon Energy Inc. 11,000,000 Shares Common Stock ($0.01 par value) Underwriting Agreement

Exhibit 1.1 Athlon Energy Inc. 11,000,000 Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York April , 2014 Citigroup Global Markets Inc. Goldman, Sachs & Co. As Representatives of the several Underwriters, c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Athlon Energy Inc., a corporation organized under the laws of De

April 15, 2014 EX-99.1

JOINT FILING AGREEMENT

EXHIBIT 99.1 JOINT FILING AGREEMENT The undersigned hereby agree that the Statement on Schedule 13G filed herewith (and any amendments thereto), relating to the Common Stock of Athlon Energy Inc., a Delaware corporation, is being filed jointly with the Securities and Exchange Commission pursuant to Rule 13d-1(c) under the Securities Exchange Act of 1934, as amended, on behalf of each of the unders

April 15, 2014 S-1/A

- S-1/A

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on April 15, 2014 Registration No.

April 11, 2014 EX-99.4

ATHLON ENERGY INC. UNAUDITED PRO FORMA FINANCIAL STATEMENTS

Exhibit 99.4 ATHLON ENERGY INC. UNAUDITED PRO FORMA FINANCIAL STATEMENTS INTRODUCTION Athlon Energy Inc. (“Athlon”), a Delaware corporation, incorporated on April 1, 2013 and is an independent exploration and production company focused on the acquisition, development, and exploitation of unconventional oil and liquids-rich natural gas reserves in the Permian Basin. On April 7, 2014, Athlon entered

April 11, 2014 EX-99.1

C O N T E N T S

Exhibit 99.1 HIBERNIA ENERGY, LLC AND SUBSIDIARIES CONSOLIDATED FINANCIAL REPORT DECEMBER 31, 2013 C O N T E N T S Page INDEPENDENT AUDITOR’S REPORT 2 FINANCIAL STATEMENTS Consolidated Balance Sheet 3 Consolidated Statement of Operations 5 Consolidated Statement of Members’ Equity 6 Consolidated Statement of Cash Flows 7 Notes to Consolidated Financial Statements 9 INDEPENDENT AUDITOR’S REPORT To

April 11, 2014 8-K/A

Financial Statements and Exhibits - AMENDMENT TO FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No.1) 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 8, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS

April 9, 2014 EX-99.1

ATHLON ENERGY ANNOUNCES NORTHERN MIDLAND BASIN ACQUISITIONS

Exhibit 99.1 ATHLON ENERGY ANNOUNCES NORTHERN MIDLAND BASIN ACQUISITIONS FORT WORTH, Texas—(BUSINESS WIRE)—April 8, 2014—Athlon Energy (NYSE: ATHL) (“Athlon”, or the “Company”) today announced that it has entered into multiple definitive agreements with five unrelated third-party sellers to acquire certain producing properties and undeveloped acreage for an aggregate purchase price of $873 million

April 9, 2014 S-1

Registration Statement - S-1

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on April 8, 2014 Registration No.

April 9, 2014 EX-99.2

INDEPENDENT AUDITOR’S REPORT

Exhibit 99.2 HIBERNIA HOLDINGS, LLC — MARTIN COUNTY ASSETS FINANCIAL SCHEDULE DECEMBER 31, 2013 CONTENTS Page INDEPENDENT AUDITOR’S REPORT 1 FINANCIAL SCHEDULE Schedule of Direct Operating Revenues and Direct Operating Expenses 2 Notes to Schedule of Direct Operating Revenues and Direct Operating Expenses 3 INDEPENDENT AUDITOR’S REPORT To Hibernia Holdings, LLC We have audited the accompanying Sch

April 9, 2014 EX-21.1

Subsidiaries of Athlon Energy Inc.

QuickLinks - Click here to rapidly navigate through this document Exhibit 21.1 Subsidiaries of Athlon Energy Inc. Name of Subsidiary State or other Jurisdiction of Incorporation or Organization Athlon Holdings GP LLC Delaware Athlon Holdings LP Delaware Athlon Finance Corp. Delaware QuickLinks Exhibit 21.1 Subsidiaries of Athlon Energy Inc.

April 9, 2014 8-K

Regulation FD Disclosure, 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): April 8, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorpo

April 9, 2014 EX-99.3

C O N T E N T S

Exhibit 99.3 PIEDRA ENERGY II, LLC FINANCIAL SCHEDULE DECEMBER 31, 2013 C O N T E N T S Page INDEPENDENT AUDITOR’S REPORT 1 FINANCIAL SCHEDULE Schedule of Direct Operating Revenues and Direct Operating Expenses 2 Notes to Schedule of Direct Operating Revenues and Direct Operating Expenses 3 INDEPENDENT AUDITOR’S REPORT To Piedra Energy II, LLC We have audited the accompanying Schedule of Direct Op

February 26, 2014 EX-99.1

ATHLON ENERGY ANNOUNCES 2013 FINANICAL RESULTS AND PROVIDES OPERATIONAL UPDATE

EX-99.1 2 a14-68441ex99d1.htm EX-99.1 Exhibit 99.1 ATHLON ENERGY ANNOUNCES 2013 FINANICAL RESULTS AND PROVIDES OPERATIONAL UPDATE FORT WORTH, Texas—(BUSINESS WIRE)—February 25, 2014 Athlon Energy (NYSE: ATHL) (“Athlon” or the “Company”) today reported fourth quarter and full-year 2013 financial results, announced year-end 2013 proved reserves, and provided an operational update on vertical and hor

February 26, 2014 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 25, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inc

February 11, 2014 EX-1.1

Athlon Energy Inc. 14,000,000 Shares Common Stock ($0.01 par value) Underwriting Agreement

Exhibit 1.1 Athlon Energy Inc. 14,000,000 Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York February 6, 2014 Citigroup Global Markets Inc. Goldman, Sachs & Co. As Representatives of the several Underwriters, c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Certain stockholders named on Schedule I hereto (the “Sellin

February 11, 2014 EX-1

AGREEMENT OF JOINT FILING (ATHLON ENERGY INC.)

Exhibit 1 AGREEMENT OF JOINT FILING (ATHLON ENERGY INC.) In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned hereby confirm the agreement by and among them to the joint filing on behalf of them of the Statement on Schedule 13G and any and all further amendments thereto, with respect to the securities of the above referenced issuer, and that this

February 11, 2014 SC 13G

ATHL / / Apollo Management Holdings GP, LLC - SC 13G Passive Investment

SC 13G 1 a14-54471sc13g.htm SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Amendment No. )* Under the Securities Exchange Act of 1934 ATHLON ENERGY INC. (Name of Issuer) Common Stock, par value $0.01 (Title of Class of Securities) 047477104 (CUSIP Number) December 31, 2013 (Date of Event Which Requires Filing of this Statement) Check the appropriate bo

February 11, 2014 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 6, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inco

February 10, 2014 424B4

14,000,000 Shares Athlon Energy Inc. Common Stock $32.00 per share

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents Filed Pursuant to Rule 424(b)(4) Registration No.

February 7, 2014 8-K

Completion of Acquisition or Disposition of Assets - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 6, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inco

February 6, 2014 S-1MEF

- REGISTRATION STMT TO ADD SECURITIES TO A PRIOR RELATED EFFECTIVE REGISTRATION STMT.

As filed with the Securities and Exchange Commission on February 6, 2014 Registration No.

February 4, 2014 EX-1.1

Athlon Energy Inc. [ ] Shares Common Stock ($0.01 par value) Underwriting Agreement

Exhibit 1.1 Athlon Energy Inc. [ ] Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York February [ ], 2014 Citigroup Global Markets Inc. Goldman, Sachs & Co. As Representatives of the several Underwriters, c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Certain stockholders named on Schedule I hereto (the “Selling Sto

February 4, 2014 S-1/A

- S-1/A

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on February 4, 2014 Registration No.

January 27, 2014 EX-99.1

ATHLON ENERGY ANNOUNCES OPERATIONAL UPDATE, ACQUISITION IN THE MIDLAND BASIN & PROVIDES 2014 OUTLOOK

Exhibit 99.1 ATHLON ENERGY ANNOUNCES OPERATIONAL UPDATE, ACQUISITION IN THE MIDLAND BASIN & PROVIDES 2014 OUTLOOK FORT WORTH, Texas—(BUSINESS WIRE)—January 24, 2014—Athlon Energy (NYSE: ATHL) (“Athlon”, or the “Company”) today announced select operational results for the fourth quarter and full-year 2013, an acquisition in the core of the Company’s existing operating areas in the northern Midland

January 27, 2014 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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): January 24, 2014 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inco

January 24, 2014 S-1

Registration Statement - S-1

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on January 24, 2014 Registration No.

January 24, 2014 EX-21.1

- EX-21.1

QuickLinks - Click here to rapidly navigate through this document Exhibit 21.1 Subsidiaries of Athlon Energy Inc. Name of Subsidiary State or other Jurisdiction of Incorporation or Organization Athlon Holdings GP LLC Delaware Athlon Holdings LP Delaware Athlon Finance Corp. Delaware QuickLinks Exhibit 21.1 Subsidiaries of Athlon Energy Inc.

November 19, 2013 EX-10.2

FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT BORROWING BASE REDETERMINATION

Exhibit 10.2 FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT AND BORROWING BASE REDETERMINATION THIS FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT AND BORROWING BASE REDETERMINATION (herein called this “Amendment”) is made as of November , 2013 by and among Athlon Holdings LP, a Delaware limited partnership (the “Borrower”), each Lender party hereto as set forth on the signatur

November 19, 2013 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 - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 13, 2013 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inc

November 13, 2013 8-K

Regulation FD Disclosure - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 13, 2013 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inc

November 12, 2013 EX-99.1

ATHLON ENERGY ANNOUNCES THIRD QUARTER 2013 RESULTS AND PROVIDES OPERATIONAL UPDATE

Exhibit 99.1 ATHLON ENERGY ANNOUNCES THIRD QUARTER 2013 RESULTS AND PROVIDES OPERATIONAL UPDATE FORT WORTH, Texas—(BUSINESS WIRE)—November 11, 2013 Athlon Energy (NYSE: ATHL) (“Athlon” or the “Company”) today reported unaudited third quarter 2013 results, provided an operational update and introduced fourth quarter 2013 guidance. Company Highlights · Adjusted EBITDA increased 109% to $63.3 million

November 12, 2013 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 11, 2013 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inc

October 10, 2013 EX-99.1

ATHLON ENERGY APPOINTS MARK STEVENS TO ITS BOARD OF DIRECTORS

Exhibit 99.1 ATHLON ENERGY APPOINTS MARK STEVENS TO ITS BOARD OF DIRECTORS FORT WORTH, Texas—(BUSINESS WIRE)—October 10, 2013—Athlon Energy (NYSE: ATHL) (“Athlon”) today announced that its Board of Directors has appointed Mark A. Stevens, 50, to serve as a Director, effective immediately. Mr. Stevens will serve as an independent director under the Board’s appointment for an initial term that will

October 10, 2013 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 10, 2013 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of inco

August 20, 2013 EX-4.2

- EX-4.2

Exhibit 4.2 SUPPLEMENTAL INDENTURE SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”) dated as of August 14, 2013, among ATHLON ENERGY INC., a Delaware corporation (the “Parent Guarantor”), the direct parent of ATHLON HOLDINGS LP (or its successor), a Delaware limited partnership (“Holdings”), and WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association, as trustee under the inde

August 20, 2013 EX-4.3

ATHLON ENERGY INC. 2013 INCENTIVE AWARD PLAN ARTICLE 1.

Exhibit 4.3 ATHLON ENERGY INC. 2013 INCENTIVE AWARD PLAN ARTICLE 1. PURPOSE The purpose of the Athlon Energy Inc. 2013 Incentive Award Plan (as it may be amended or restated from time to time, the “Plan”) is to promote the success and enhance the value of Athlon Energy Inc. (the “Company”) by linking the individual interests of the members of the Board, Employees, and Consultants to those of Compa

August 20, 2013 S-8

- SECURITIES TO BE OFFERED TO EMPLOYEES PURSUANT TO EMPLOYEE BENEFIT PLANS

As filed with the Securities and Exchange Commission on August 20, 2013 Registration No.

August 20, 2013 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 - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 14, 2013 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incor

August 15, 2013 EX-10.3

Employment Agreement

Exhibit 10.3 Employment Agreement This Employment Agreement (the “Agreement”), dated as of August 7, 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and Nelson K. Treadway (the “Employee”) (collectively referred to herein as the “Parties”). RECITALS A. It is the desire of the Company to ass

August 15, 2013 EX-99.1

ATHLON ENERGY INC. ANNOUNCES CLOSING OF INITIAL PUBLIC OFFERING, INCLUDING UNDERWRITERS’ OVERALLOTMENT OPTION

Exhibit 99.1 ATHLON ENERGY INC. ANNOUNCES CLOSING OF INITIAL PUBLIC OFFERING, INCLUDING UNDERWRITERS’ OVERALLOTMENT OPTION Fort Worth, TX (August 7, 2013) — Athlon Energy Inc. (NYSE: ATHL) (“Athlon”) announced today the closing of its previously announced public offering of 18,137,895 shares of common stock at $20.00 per share, which includes 2,348,421 shares purchased from the selling stockholder

August 15, 2013 EX-10.1

Employment Agreement

Exhibit 10.1 Employment Agreement This Employment Agreement (the “Agreement”), dated as of August 7, 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and Robert C. Reeves (the “Executive”) (collectively referred to herein as the “Parties”). RECITALS A. It is the desire of the Company to assu

August 15, 2013 EX-10.4

Employment Agreement

Exhibit 10.4 Employment Agreement This Employment Agreement (the “Agreement”), dated as of August 7, 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and David B. McClelland (the “Employee”) (collectively referred to herein as the “Parties”). RECITALS A. It is the desire of the Company to as

August 15, 2013 EX-10.2

Employment Agreement

Exhibit 10.2 Employment Agreement This Employment Agreement (the “Agreement”), dated as of August 7, 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and William B. D. Butler (the “Employee”) (collectively referred to herein as the “Parties”). RECITALS A. It is the desire of the Company to a

August 15, 2013 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 7, 2013 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incorp

August 14, 2013 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition - CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES

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 13, 2013 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 001-36026 46-2549833 (State or other jurisdiction (Commission (IRS Employer of incor

August 14, 2013 EX-99.1

ATHLON ENERGY ANNOUNCES SECOND QUARTER 2013 RESULTS AND PROVIDES OPERATIONS AND LIQUIDITY UPDATES

EX-99.1 2 a13-185931ex99d1.htm EX-99.1 Exhibit 99.1 ATHLON ENERGY ANNOUNCES SECOND QUARTER 2013 RESULTS AND PROVIDES OPERATIONS AND LIQUIDITY UPDATES FORT WORTH, Texas—(BUSINESS WIRE)—August 13, 2013 Athlon Energy (NYSE: ATHL) (“Athlon” or the “Company”) today reported unaudited second quarter 2013 results and provided an operations update. Company Highlights · Average daily production volumes for

August 5, 2013 424B4

15,789,474 Shares

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Filed Pursuant to Rule 424(b)(4) Registration No.

July 30, 2013 CORRESP

-

July 30, 2013 U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attention: Anne Nguyen Parker Division of Corporate Finance Re: Athlon Energy Inc. Registration Statement on Form S-1 (File No. 333-189109) Ladies and Gentlemen: As the representative of the several underwriters of the Athlon Energy Inc. (the “Company”) proposed init

July 30, 2013 CORRESP

-

Athlon Energy Inc. 420 Throckmorton Street, Suite 1200 Fort Worth, Texas 76102 (817) 984-8200 July 30, 2013 Via Edgar Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attn: Anne Nguyen Parker, Branch Chief Re: Athlon Energy Inc. Registration Statement on Form S-1 File No. 333-189109 Ladies and Gentlemen: Athlon Energy Inc. (the “Comp

July 25, 2013 8-A12B

- REGISTRATION/LISTING OF SECURITIES ON A NATIONAL SECURITIES EXCHANGE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 ATHLON ENERGY INC. (Exact name of registrant as specified in its charter) Delaware 46-2549833 (State of incorporation or organization) (I.R.S. Employer Identification No.) 420 Throckmorton Street

July 22, 2013 S-1/A

- S-1/A

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on July 22, 2013 Registration No.

July 22, 2013 EX-1.1

Athlon Energy Inc. [ ] Shares Common Stock ($0.01 par value) Underwriting Agreement

Exhibit 1.1 Athlon Energy Inc. [ ] Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York July [ ], 2013 Citigroup Global Markets Inc. As Representative of the several Underwriters, 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Athlon Energy Inc., a corporation organized under the laws of Delaware (the “Company”), proposes to sell to the several under

July 18, 2013 CORRESP

-

811 Main Street, Suite 3700 Houston, TX 77002 Tel: +1.713.546.5400 Fax: +1.713.546.5401 www.lw.com FIRM / AFFILIATE OFFICES Abu Dhabi Milan Barcelona Moscow Beijing Munich Boston New Jersey Brussels New York Chicago Orange County Doha Paris Dubai Riyadh July 18, 2013 Düsseldorf Rome Frankfurt San Diego Hamburg San Francisco Hong Kong Shanghai Via EDGAR Houston Silicon Valley London Singapore Secur

July 17, 2013 CORRESP

-

Athlon Energy Inc. 420 Throckmorton Street, Suite 1200 Fort Worth, Texas 76102 July 17, 2013 Via EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attn: Anne Nguyen Parker, Branch Chief Re: Athlon Energy Inc. Registration Statement on Form S-1 Filed June 5, 2013 File No. 333-189109 Dear Ms. Parker: On July 10, 2013, Athlon Energ

July 15, 2013 CORRESP

-

Athlon Energy Inc. 420 Throckmorton Street, Suite 1200 Fort Worth, Texas 76102 July 15, 2013 Via EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attn: Anne Nguyen Parker, Branch Chief Re: Athlon Energy Inc. Registration Statement on Form S-1 Filed June 5, 2013 File No. 333-189109 Dear Ms. Nguyen: On July 10, 2013, Athlon Energ

July 12, 2013 EX-10.10

ADVISORY SERVICES AND TRANSACTION FEE TERMINATION AGREEMENT

Exhibit 10.10 ADVISORY SERVICES AND TRANSACTION FEE TERMINATION AGREEMENT This Advisory Services and Transaction Fee Termination Agreement (this “Agreement”) is made as of this day of , 2013, by and among Athlon Holdings LP, a Delaware Limited Partnership (the “Partnership”) (as assignee of Athlon Energy LP, a Delaware limited partnership), Apollo Management VII, L.P., a Delaware limited partnersh

July 12, 2013 EX-21.1

- EX-21.1

Exhibit 21.1 Subsidiaries of Athlon Energy Inc. as of July 12, 2013 Name of Subsidiary State or other Jurisdiction of Incorporation or Organization Athlon Holdings LP Delaware Athlon Energy LLC Delaware Athlon Energy LP Delaware Athlon FE Energy LP Delaware Athlon Energy Operating LLC Delaware Athlon FE Operating LLC Delaware Athlon Finance Corp. Delaware

July 12, 2013 EX-10.11

- EX-10.11

Exhibit 10.11 AMENDED AND RESTATED LIMITED PARTNERSHIP AGREEMENT OF ATHLON HOLDINGS LP A Delaware Limited Partnership Dated as of , 2013 AMENDED AND RESTATED LIMITED PARTNERSHIP AGREEMENT OF ATHLON HOLDINGS LP TABLE OF CONTENTS ARTICLE I DEFINITIONS 1 Section 1.1. Definitions 1 Section 1.2. Other Definitions 7 Section 1.3. Directly or Indirectly 7 Section 1.4. Construction 7 ARTICLE II ORGANIZATIO

July 12, 2013 S-1/A

- S-1/A

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on July 12, 2013 Registration No.

July 12, 2013 CORRESP

-

811 Main Street, Suite 3700 Houston, TX 77002 Tel: +1.713.546.5400 Fax: +1.713.546.5401 www.lw.com FIRM / AFFILIATE OFFICES Abu Dhabi Milan Barcelona Moscow Beijing Munich Boston New Jersey Brussels New York Chicago Orange County Doha Paris Dubai Riyadh Düsseldorf Rome Frankfurt San Diego July 12, 2013 Hamburg San Francisco Hong Kong Shanghai Via EDGAR and Hand-Delivery Houston Silicon Valley Lond

July 12, 2013 EX-10.4

- EX-10.4

Exhibit 10.4 Employment Agreement This Employment Agreement (the “Agreement”), dated as of , 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and (the “Employee”) (collectively referred to herein as the “Parties”). RECITALS A. It is the desire of the Company to assure itself of the services

July 12, 2013 EX-10.3

- EX-10.3

Exhibit 10.3 Employment Agreement This Employment Agreement (the “Agreement”), dated as of , 2013 (the “Effective Date”), is made by and between Athlon Holdings LP, a Delaware limited partnership (together with any successor thereto, the “Company”), and Robert C. Reeves (the “Executive”) (collectively referred to herein as the “Parties”). RECITALS A. It is the desire of the Company to assure itsel

July 12, 2013 EX-10.5

- EX-10.5

Exhibit 10.5 ATHLON ENERGY INC. 2013 INCENTIVE AWARD PLAN ARTICLE 1. PURPOSE The purpose of the Athlon Energy Inc. 2013 Incentive Award Plan (as it may be amended or restated from time to time, the “Plan”) is to promote the success and enhance the value of Athlon Energy Inc. (the “Company”) by linking the individual interests of the members of the Board, Employees, and Consultants to those of Comp

July 12, 2013 EX-10.9

- EX-10.9

Exhibit 10.9 FORM OF STOCKHOLDERS AGREEMENT STOCKHOLDERS AGREEMENT (this “Agreement”), dated as of , 2013, by and among ATHLON ENERGY INC., a Delaware corporation (the “Corporation”), and those stockholders of the Corporation listed on Schedule A hereto. WHEREAS, the Corporation, the Apollo Entities (as defined below) and the Employee Stockholders (as defined below), as the holders of the majority

July 10, 2013 CORRESP

-

Athlon Energy Inc. 420 Throckmorton Street, Suite 1200 Fort Worth, Texas 76102 July 10, 2013 Via EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attn: Anne Nguyen Parker, Branch Chief Re: Athlon Energy Inc. Registration Statement on Form S-1 Filed June 5, 2013 File No. 333-189109 Dear Ms. Nguyen: Pursuant to discussions with t

June 27, 2013 CORRESP

-

811 Main Street, Suite 3700 Houston, TX 77002 Tel: +1.713.546.5400 Fax: +1.713.546.5401 www.lw.com FIRM / AFFILIATE OFFICES Abu Dhabi Milan Barcelona Moscow Beijing Munich Boston New Jersey Brussels New York Chicago Orange County June 26, 2013 Doha Paris Dubai Riyadh Düsseldorf Rome Frankfurt San Diego Hamburg San Francisco Via EDGAR and Hand-Delivery Hong Kong Shanghai Houston Silicon Valley Secu

June 27, 2013 EX-21.1

Subsidiaries of Athlon Energy Inc. as of June 26, 2013

Exhibit 21.1 Subsidiaries of Athlon Energy Inc. as of June 26, 2013 Name of Subsidiary State or other Jurisdiction of Incorporation or Organization Athlon Holdings LP Delaware Athlon Energy LLC Delaware Athlon Energy LP Delaware Athlon FE Energy LP Delaware Athlon Energy Operating LLC Delaware Athlon FE Operating LLC Delaware Athlon Finance Corp. Delaware

June 27, 2013 EX-3.1

FORM OF AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ATHLON ENERGY INC.

Exhibit 3.1 FORM OF AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ATHLON ENERGY INC. Athlon Energy Inc. (the “Corporation”), a corporation organized and existing under the laws and by virtue of the General Corporation Law of the State of Delaware, DOES HEREBY CERTIFY: 1. The name of the Corporation is Athlon Energy Inc. 2. The original Certificate of Incorporation of the Corporation (the “O

June 27, 2013 EX-3.2

FORM OF AMENDED AND RESTATED BYLAWS ATHLON ENERGY INC. ARTICLE I. OFFICES AND RECORDS

Exhibit 3.2 FORM OF AMENDED AND RESTATED BYLAWS OF ATHLON ENERGY INC. ARTICLE I. OFFICES AND RECORDS SECTION 1.1 Delaware Office. The registered office of Athlon Energy Inc. (the “Corporation”) in the State of Delaware shall be located in the City of Wilmington, County of New Castle, and the name and address of its registered agent is c/o Corporation Service Company, 2711 Centerville Road, Suite 4

June 27, 2013 EX-10.12

ATHLON ENERGY INC. FORM OF DIRECTOR AND OFFICER INDEMNIFICATION AGREEMENT

Exhibit 10.12 ATHLON ENERGY INC. FORM OF DIRECTOR AND OFFICER INDEMNIFICATION AGREEMENT This Director and Officer Indemnification Agreement (this “Agreement”) is made as of this day of 2013, by and between Athlon Energy Inc., a Delaware corporation (the “Company”), and (the “Indemnitee”). WHEREAS, the Company desires to attract and retain the services of highly qualified individuals to act as dire

June 27, 2013 EX-10.14

FORM OF EXCHANGE AGREEMENT

Exhibit 10.14 FORM OF EXCHANGE AGREEMENT This EXCHANGE AGREEMENT (this “Agreement”), dated as of , 2013, is entered into by and among Athlon Energy Inc., a Delaware corporation (the “Corporation”), and each of the Partners (as defined herein). RECITALS WHEREAS, the parties desire to provide for the exchange of limited partner interests (“Units”) in Athlon Holdings LP, a Delaware limited partnershi

June 27, 2013 S-1/A

- S-1/A

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on June 26, 2013 Registration No.

June 27, 2013 EX-10.13

FORM OF TAX RECEIVABLE AGREEMENT

Exhibit 10.13 FORM OF TAX RECEIVABLE AGREEMENT This TAX RECEIVABLE AGREEMENT (as amended from time to time, this “Agreement”), dated as of , 2013, is hereby entered into by and among Athlon Energy Inc., a Delaware corporation (the “Corporation”), Athlon Holdings LP, a Delaware limited partnership (the “Partnership”), and each of the Partners (as defined herein). RECITALS WHEREAS, the Partners own

June 5, 2013 EX-99.1

CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS

Exhibit 99.1 CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS 9601 AMBERGLEN BLVD., SUITE 117 306 WEST SEVENTH STREET, SUITE 302 1000 LOUISIANA STREET, SUITE 625 AUSTIN, TEXAS 78729-1106 FORT WORTH, TEXAS 76102-4987 HOUSTON, TEXAS 77002-5008 512-249-7000 817- 336-2461 713-651-9944 www.cgaus.com February 20, 2012 Mr. Robert C. Reeves CEO and President Athlon Energy Operating LLC 420 Throc

June 5, 2013 S-1

Registration Statement - S-1

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on June 5, 2013 Registration No.

June 5, 2013 EX-21.1

Subsidiaries of Athlon Energy Inc. as of June 5, 2013

Exhibit 21.1 Subsidiaries of Athlon Energy Inc. as of June 5, 2013 Name of Subsidiary State or other Jurisdiction of Incorporation or Organization Athlon Holdings LP Delaware Athlon Energy LLC Delaware Athlon Energy LP Delaware Athlon FE Energy LP Delaware Athlon Energy Operating LLC Delaware Athlon FE Operating LLC Delaware Athlon Finance Corp. Delaware

June 5, 2013 EX-10.1

AMENDED AND RESTATED CREDIT AGREEMENT Dated as of March 19, 2013 ATHLON HOLDINGS LP, as the Borrower, The Several Lenders from Time to Time Parties Hereto, BANK OF AMERICA, N.A., as Administrative Agent, Collateral Agent, Swingline Lender and an Issu

Exhibit 10.1 EXECUTION VERSION AMENDED AND RESTATED CREDIT AGREEMENT Dated as of March 19, 2013 among ATHLON HOLDINGS LP, as the Borrower, The Several Lenders from Time to Time Parties Hereto, BANK OF AMERICA, N.A., as Administrative Agent, Collateral Agent, Swingline Lender and an Issuing Bank, MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED and WELLS FARGO SECURITIES, LLC, as Co-Lead Arranger

June 5, 2013 EX-99.3

CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS

Exhibit 99.3 CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS 9601 AMBERGLEN BLVD., SUITE 117 306 WEST SEVENTH STREET, SUITE 302 1000 LOUISIANA STREET, SUITE 625 AUSTIN, TEXAS 78729-1106 FORT WORTH, TEXAS 76102-4987 HOUSTON, TEXAS 77002-5008 512-249-7000 817- 336-2461 713-651-9944 www.cgaus.com February 15, 2013 Mr. Robert C. Reeves CEO and President Athlon Holdings LP 420 Throckmorton S

June 5, 2013 EX-10.2

BORROWING BASE REDETERMINATION AND FIRST AMENDMENT TO AMENDED AND RESTATED GUARANTEE AGREEMENT

Exhibit 10.2 BORROWING BASE REDETERMINATION AND FIRST AMENDMENT TO AMENDED AND RESTATED GUARANTEE AGREEMENT THIS BORROWING BASE REDETERMINATION AND FIRST AMENDMENT TO AMENDED AND RESTATED GUARANTEE AGREEMENT (herein called this “Amendment”) is made as of May 31, 2013 by and among Athlon Holdings LP, a Delaware limited partnership (the “Borrower”), Bank of America, N.A., as administrative agent (in

June 5, 2013 CORRESP

-

811 Main Street, Suite 3700 Houston, TX 77002 Tel: +1.713.546.5400 Fax: +1.713.546.5401 www.lw.com FIRM / AFFILIATE OFFICES Abu Dhabi Moscow Barcelona Munich Beijing New Jersey Boston New York Brussels Orange County Chicago Paris Doha Riyadh Dubai Rome Frankfurt San Diego Hamburg San Francisco Hong Kong Shanghai Houston Silicon Valley London Singapore Los Angeles Tokyo Madrid Washington, D.C. Mila

June 5, 2013 EX-4.3

ATHLON HOLDINGS LP ATHLON FINANCE CORP. 73/8% Senior Notes due 2021 REGISTRATION RIGHTS AGREEMENT

Exhibit 4.3 Execution Version $500,000,000 ATHLON HOLDINGS LP ATHLON FINANCE CORP. 73/8% Senior Notes due 2021 REGISTRATION RIGHTS AGREEMENT April 17, 2013 Merrill Lynch, Pierce, Fenner & Smith Incorporated As Representative of the Initial Purchasers Merrill Lynch, Pierce, Fenner & Smith Incorporated One Bryant Park New York, New York 10036 Ladies and Gentlemen: Athlon Holdings LP, a Delaware limi

June 5, 2013 EX-99.2

CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS

Exhibit 99.2 CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS 9601 AMBERGLEN BLVD., SUITE 117 306 WEST SEVENTH STREET, SUITE 302 1000 LOUISIANA STREET, SUITE 625 AUSTIN, TEXAS 78729-1106 FORT WORTH, TEXAS 76102-4987 HOUSTON, TEXAS 77002-5008 512-249-7000 817- 336-2461 713-651-9944 www.cgaus.com February 20, 2012 Mr. Robert C. Reeves CEO and President Athlon FE Operating LLC 420 Throckmor

June 5, 2013 EX-4.2

ATHLON HOLDINGS LP ATHLON FINANCE CORP. as Issuers and the Subsidiary Guarantors party hereto from time to time 73/8% Senior Notes due 2021 Dated as of April 17, 2013 Wells Fargo Bank, National Association as Trustee

Exhibit 4.2 EXECUTION VERSION ATHLON HOLDINGS LP and ATHLON FINANCE CORP. as Issuers and the Subsidiary Guarantors party hereto from time to time 73/8% Senior Notes due 2021 INDENTURE Dated as of April 17, 2013 and Wells Fargo Bank, National Association as Trustee TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE SECTION 1.01 Definitions 1 SECTION 1.02 Other Definitions 4

April 29, 2013 EX-4.2

-

Exhibit 4.2 EXECUTION VERSION ATHLON HOLDINGS LP and ATHLON FINANCE CORP. as Issuers and the Subsidiary Guarantors party hereto from time to time 73/8% Senior Notes due 2021 INDENTURE Dated as of April 17, 2013 and Wells Fargo Bank, National Association as Trustee TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE SECTION 1.01 Definitions 1 SECTION 1.02 Other Definitions 4

April 29, 2013 DRS

-

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As confidentially submitted to the Securities and Exchange Commission on April 29, 2013 Registration No.

April 29, 2013 EX-99.2

CAWLEY, GILLESPIE & ASSOCIATES, INC.

Exhibit 99.2 CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS 9601 AMBERGLEN BLVD., SUITE 117 306 WEST SEVENTH STREET, SUITE 302 1000 LOUISIANA STREET, SUITE 625 AUSTIN, TEXAS 78729-1106 FORT WORTH, TEXAS 76102-4987 HOUSTON, TEXAS 77002-5008 512-249-7000 817- 336-2461 713-651-9944 www.cgaus.com February 20, 2012 Mr. Robert C. Reeves CEO and President Athlon FE Operating LLC 420 Throckmor

April 29, 2013 EX-4.3

ATHLON HOLDINGS LP ATHLON FINANCE CORP. 73/8% Senior Notes due 2021 REGISTRATION RIGHTS AGREEMENT

Exhibit 4.3 Execution Version $500,000,000 ATHLON HOLDINGS LP ATHLON FINANCE CORP. 73/8% Senior Notes due 2021 REGISTRATION RIGHTS AGREEMENT April 17, 2013 Merrill Lynch, Pierce, Fenner & Smith Incorporated As Representative of the Initial Purchasers Merrill Lynch, Pierce, Fenner & Smith Incorporated One Bryant Park New York, New York 10036 Ladies and Gentlemen: Athlon Holdings LP, a Delaware limi

April 29, 2013 EX-99.3

CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS

Exhibit 99.3 CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS 9601 AMBERGLEN BLVD., SUITE 117 306 WEST SEVENTH STREET, SUITE 302 1000 LOUISIANA STREET, SUITE 625 AUSTIN, TEXAS 78729-1106 FORT WORTH, TEXAS 76102-4987 HOUSTON, TEXAS 77002-5008 512-249-7000 817- 336-2461 713-651-9944 www.cgaus.com February 15, 2013 Mr. Robert C. Reeves CEO and President Athlon Holdings LP 420 Throckmorton S

April 29, 2013 EX-10.1

-

Exhibit 10.1 EXECUTION VERSION AMENDED AND RESTATED CREDIT AGREEMENT Dated as of March 19, 2013 among ATHLON HOLDINGS LP, as the Borrower, The Several Lenders from Time to Time Parties Hereto, BANK OF AMERICA, N.A., as Administrative Agent, Collateral Agent, Swingline Lender and an Issuing Bank, MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED and WELLS FARGO SECURITIES, LLC, as Co-Lead Arranger

April 29, 2013 DRSLTR

-

811 Main Street, Suite 3700 Houston, TX 77002 Tel: +1.713.546.5400 Fax: +1.713.546.5401 www.lw.com FIRM / AFFILIATE OFFICES Abu Dhabi Moscow Barcelona Munich Beijing New Jersey Boston New York Brussels Orange County Chicago Paris April 29, 2013 Doha Riyadh Dubai Rome Frankfurt San Diego Hamburg San Francisco Hong Kong Shanghai CONFIDENTIAL SUBMISSION Houston Silicon Valley London Singapore Pursuan

April 29, 2013 EX-21.1

Subsidiaries of Athlon Energy Inc. as of April 29, 2013

Exhibit 21.1 Subsidiaries of Athlon Energy Inc. as of April 29, 2013 Name of Subsidiary State or other Jurisdiction of Incorporation or Organization Athlon Holdings LP Delaware Athlon Energy LLC Delaware Athlon Energy LP Delaware Athlon FE Energy LP Delaware Athlon Energy Operating LLC Delaware Athlon FE Operating LLC Delaware Athlon Finance Corp. Delaware

April 29, 2013 EX-99.1

CAWLEY, GILLESPIE & ASSOCIATES, INC.

Exhibit 99.1 CAWLEY, GILLESPIE & ASSOCIATES, INC. PETROLEUM CONSULTANTS 9601 AMBERGLEN BLVD., SUITE 117 306 WEST SEVENTH STREET, SUITE 302 1000 LOUISIANA STREET, SUITE 625 AUSTIN, TEXAS 78729-1106 FORT WORTH, TEXAS 76102-4987 HOUSTON, TEXAS 77002-5008 512-249-7000 817- 336-2461 713-651-9944 www.cgaus.com February 20, 2012 Mr. Robert C. Reeves CEO and President Athlon Energy Operating LLC 420 Throc

Fintel data has been cited in the following publications:
Daily Mail Fox Business Business Insider Wall Street Journal The Washington Post Bloomberg Financial Times Globe and Mail
NASDAQ.com Reuters The Guardian Associated Press FactCheck.org Snopes Politifact
Federal Register The Intercept Forbes Fortune Magazine TheStreet Time Magazine Canadian Broadcasting Corporation International Business Times
Cambridge University Press Investopedia MarketWatch NY Daily News Entrepreneur Newsweek Barron's El Economista