UTL / Unitil Corporation - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Security Type

Calculation of Filing Fee Tables S-3 UNITIL CORP Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, without par value 457(o) 1,602,358 $ 46.

Unitil Announces Common Stock Offering

EX-99.1 Exhibit 99.1 FOR RELEASE Unitil Announces Common Stock Offering HAMPTON, NH, August 14, 2025: Unitil Corporation (NYSE: UTL) (unitil.com) (the “Company”) today announced a registered offering of $60,000,000 of shares of its common stock. The Company’s common stock is listed on the New York Stock Exchange under the symbol “UTL.” The Company has granted the underwriters of the offering an op

UNITIL CORPORATION 1,393,355 Shares of Common Stock UNDERWRITING AGREEMENT

EX-1.1 Exhibit 1.1 EXECUTION VERSION UNITIL CORPORATION 1,393,355 Shares of Common Stock UNDERWRITING AGREEMENT Dated: August 14, 2025 TABLE OF CONTENTS Page SECTION 1. Representations and Warranties 2 SECTION 2. Sale and Delivery to Underwriters; Closing 15 SECTION 3. Covenants of the Company 17 SECTION 4. Payment of Expenses 22 SECTION 5. Conditions of Underwriters’ Obligations 23 SECTION 6. Ind

1,393,355 Shares of Common Stock

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No.

Unitil Announces Pricing of Common Stock Offering

EX-99.2 Exhibit 99.2 FOR RELEASE Unitil Announces Pricing of Common Stock Offering HAMPTON, NH, August 14, 2025: Unitil Corporation (NYSE: UTL) (unitil.com) (the “Company”) today announced that it has priced its previously announced public offering of 1,393,355 shares of its common stock at a price of $46.65 per share. The offering is expected to close on August 18, 2025, subject to customary clos

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, 2025 UNITIL CORPORATIO

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, 2025 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fi

Subject to Completion, dated August 14, 2025

424B5 Table of Contents The information in this preliminary prospectus supplement and the accompanying prospectus is not complete and may be changed.

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPOR

Unitil Corporation Press Release Dated August 4, 2025 Announcing Earnings for the Quarter Ended June 30, 2025.

Page 1 of 7 Exhibit 99.1 FOR RELEASE Unitil Reports Second Quarter Earnings Hampton, N.H., AUGUST 4, 2025 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $4.0 million, or $0.25 in Earnings Per Share (EPS) for the second quarter of 2025, a decrease of $0.3 million in Net Income, or $0.02 in EPS, compared to the second quarter of 2024. For the six months ended June 30, 20

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 8, 2025 UNITIL CORPORATION (

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 8, 2025 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

Note Purchase Agreement dated July 8, 2025 by and among Bangor Natural Gas Company and the several purchasers named therein.

EX-4.1 Exhibit 4.1 NOTE 1: In accordance with Item 601(a)(5) of Regulation S-K, this exhibit omits certain of its schedules and exhibits. This exhibit’s table of contents includes a brief description of the subject matter of all of its schedules and exhibits, including the omitted schedules and exhibits. The registrant acknowledges that it must provide a copy of any omitted schedules or exhibits t

6.31% Senior Note, Series 2025B, due July 8, 2035, issued by Bangor Natural Gas Company to United of Omaha Life Insurance Company.

EX-4.3 Exhibit 4.3 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES

5.70% Senior Note, Series 2025A, due July 8, 2030, issued by Bangor Natural Gas Company to CoBank, ACB.

EX-4.2 Exhibit 4.2 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-8858 A. Full title of the plan and the address of the plan, if different from t

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 3, 2025 UNITIL CORPORATION (

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 3, 2025 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of incorp

Distribution Agreement, dated June 3, 2025, by and among Unitil Corporation, Janney Montgomery Scott LLC and Scotia Capital (USA) Inc. (each as agent and/or forward seller) and Janney Montgomery Scott LLC and The Bank of Nova Scotia (each as forward purchaser)

EX-10.1 Exhibit 10.1 DISTRIBUTION AGREEMENT June 3, 2025 Janney Montgomery Scott LLC 1717 Arch Street Philadelphia, PA 19103 Scotia Capital (USA) Inc. 260 Vesey Street, 23rd Floor New York, NY 10281 As Agents and/or Forward Sellers Janney Montgomery Scott LLC 1717 Arch Street Philadelphia, PA 19103 The Bank of Nova Scotia 44 King Street West Toronto, Ontario M5H 1H1 Canada As Forward Purchasers La

CALCULATION OF FILING FEE TABLES (Form Type) UNITIL CORPORATION (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 CALCULATION OF FILING FEE TABLES 424(b)(5) (Form Type) UNITIL CORPORATION (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered (1) Proposed Maximum  Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee (2) Carry Forward  Form Type Carry Forward  File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be paid Equity Common Stock, no par value 457(o) and 457(r) —  —  $50,000,000 0.

As filed with the Securities and Exchange Commission on June 3, 2025

As filed with the Securities and Exchange Commission on June 3, 2025 File No. 333-     UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 UNITIL CORPORATION (Exact Name of Registrant as Specified in its Charter) New Hampshire 02-0381573 (State or Other Jurisdiction of Incorporation or Organization) (I.R.S. Employ

Up to $50,000,000 Common Stock

424B5 Filed Pursuant to Rule 424(b)(5) Registration No. 333-287753 PROSPECTUS SUPPLEMENT (To Prospectus dated June 3, 2025) Up to $50,000,000 Common Stock This prospectus supplement and the accompanying prospectus relate to the offer and sale from time to time of shares of our common stock, having an aggregate offering price of up to $50,000,000 through Janney Montgomery Scott LLC and Scotia Capit

Filing Fee Exhibit

Exhibit 107 CALCULATION OF FILING FEE TABLES Form S-3ASR (Form Type) UNITIL CORPORATION (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered  Proposed Maximum Offering Price Per Unit Maximum Aggregate  Offering Price Fee Rate  Amount of Registration  F

Purchase and Sale Agreement between Unitil Corporation and Aquarion Water Authority, and, solely with respect to Section 9.25 and Section 9.26 thereof, South Central Connecticut Regional Water Authority.

Exhibit 2.1 NOTE: Certain information has been excluded from this exhibit because it is both not material and is of the type that the registrant treats as private or confidential. Whenever information is excluded from this exhibit, such exclusions are denoted by “[information omitted]”. PURCHASE AND SALE AGREEMENT by and among UNITIL CORPORATION (as Buyer), AQUARION WATER AUTHORITY (as Seller), an

Entry into a Material Definitive Agreement, 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 6, 2025 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of incorpo

Unitil to Purchase Three Water Companies in Massachusetts and New Hampshire from the Aquarion Water Authority

Exhibit 99.1 FOR RELEASE Unitil to Purchase Three Water Companies in Massachusetts and New Hampshire from the Aquarion Water Authority HAMPTON, NH, May 6, 2025: Unitil Corporation (NYSE: UTL) (unitil.com) today announced that it has entered into a definitive agreement to acquire Aquarion Water Company of Massachusetts Inc., Aquarion Water Company of New Hampshire, Inc., and Abenaki Water Co., Inc.

Debt Commitment Letter between Unitil Corporation and The Bank of Nova Scotia, dated March 31, 2025

Exhibit 10.4 THE BANK OF NOVA SCOTIA 250 Vesey Street, 23rd Floor New York, NY 10281 CONFIDENTIAL March 31, 2025 Unitil Corporation 6 Liberty Lane West Hampton, NH 03842-1720 Attn: Daniel Hurstak Project Lumberjack Unsecured Term Loan Facility Commitment Letter Ladies and Gentlemen: You have advised The Bank of Nova Scotia (together with its affiliates acting through such affiliates or branches as

Unitil Corporation Press Release Dated May 6, 2025 Announcing Earnings For the Quarter Ended March 31, 2025. EX-99.1

Page 1 of 6 Exhibit 99.1 FOR RELEASE Unitil Reports First Quarter Earnings Hampton, N.H., May 6, 2025 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $27.5 million, or $1.69 in Earnings Per Share (EPS), for the quarter ended March 31, 2025, an increase of $0.3 million in Net Income, or $0.00 in EPS, compared to the same period in 2024. The Company's Adjusted Net Income

Guaranty between Unitil Corporation and Avangrid Networks, Inc., dated March 31. 2025

Exhibit 10.3 AUTHORIZED FORM - STRUCTURED SUPPORT ARRANGEMENTS GUARANTY THIS GUARANTY, dated as of March 31, 2025, is issued by Avangrid Networks, Inc., a Maine corporation, (“Guarantor”), in favor of Unitil Corporation, a New Hampshire corporation (“Guaranteed Party”). Avangrid Enterprises, Inc., a Maine corporation, (“Obligor”) is a wholly owned indirect subsidiary of Guarantor. RECITALS A. Obli

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPORATION (Exact name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 30, 2025 UNITIL CORPORATION

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 30, 2025 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

Forward-Looking Statements and Use of Non-GAAP Measures Unitil Corporation 6 Liberty Lane West Hampton, NH 03842-1720 1-888-301-7700 www.unitil.com NYSE Ticker: UTL Transfer Agent Computershare P.O. Box 43078 Providence RI 02940-3078 800-736-3001 Inv

Annual Meeting of Shareholders April 30, 2025 Exhibit 99.1 Forward-Looking Statements and Use of Non-GAAP Measures Unitil Corporation 6 Liberty Lane West Hampton, NH 03842-1720 1-888-301-7700 www.unitil.com NYSE Ticker: UTL Transfer Agent Computershare P.O. Box 43078 Providence RI 02940-3078 800-736-3001 Investor Relations 800-999-6501 [email protected] SLIDE This presentation contains

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 30, 2025 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

Stock Purchase Agreement between Unitil Corporation and Avangrid Enterprises, Inc. dated March 31, 2025

Exhibit 2.1 STOCK PURCHASE AGREEMENT between AVANGRID ENTERPRISES, INC. and UNITIL CORPORATION dated as of March 31, 2025 TABLE OF CONTENTS ARTICLE I DEFINITIONS 1 ARTICLE II PURCHASE AND SALE 13 Section 2.01 Purchase and Sale 13 Section 2.02 Purchase Price 13 Section 2.03 Transactions to be Effected at the Closing 13 Section 2.04 Purchase Price Adjustment 14 Section 2.05 Closing 17 Section 2.06 W

Unitil to Purchase Maine Natural Gas Company from Avangrid

Exhibit 99.1 FOR RELEASE Unitil to Purchase Maine Natural Gas Company from Avangrid HAMPTON, NH, April 1, 2025: Unitil Corporation (NYSE: UTL) (unitil.com) today announced that it has entered into a definitive agreement to acquire Maine Natural Gas Company (“Maine Natural”) from Avangrid Enterprises, Inc., for $86.0 million on a debt-free basis, subject to adjustment for closing working capital an

Entry into a Material Definitive Agreement, 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): March 31, 2025 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒       Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for

Chart 1 – Annual EPS and Net Income Chart 2 – Year-to-Date EPS and Net Income T 603.772.0775 www.unitil.com 6 Liberty Lane West Hampton, NH 03842

VIA EDGAR  March 20, 2025 Via EDGAR United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

VIA EDGAR 

VIA EDGAR  March 11, 2025 United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

Unitil Corporation - Compensation of Directors effective as of January 1, 2025

Exhibit 10.23 UNITIL CORPORATION Compensation of Directors On October 30, 2024, the Board of Directors of Unitil Corporation (“Unitil”) approved and adopted a revised compensation arrangement for members of the Board of Directors. The revised compensation arrangement became effective as of January 1, 2025. The revised compensation arrangement applies to members of the Board of Directors who are no

Statement Re: Subsidiaries of Registrant.

Exhibit 21.1 Subsidiaries of Registrant The Company or the registrant has nine wholly-owned subsidiaries, seven of which are corporations organized under the laws of the State of New Hampshire: Unitil Energy Systems, Inc., Northern Utilities, Inc., Granite State Gas Transmission, Inc., Unitil Power Corp., Unitil Realty Corp., Unitil Resources, Inc. and Unitil Service Corp. The eighth subsidiary, F

Unitil Corporation Press Release Dated February 10, 2025 Announcing Earnings For the Year Ended December 31, 2024.

Page 1 of 7 Exhibit 99.1 FOR RELEASE Unitil Reports Year-End Earnings - Hampton, N.H., february 10, 2025 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced GAAP Net Income of $47.1 million, or $2.93 in Earnings Per Share (EPS), for the year ended December 31, 2024, an increase of $1.9 million in Net Income, or $0.11 in EPS, compared to 2023. The Company’s Adjusted Net Income (a non-GAAP

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-8858 UNITIL CORPORATION (Exact na

Unitil Corporation Insider Trading Policy

System Policy Exhibit 19.2 Subject: Insider Trading Policy To: All Directors, Officers and Employees Policy Number: HR 1.71 From: Daniel J. Hurstak, SVP, Chief Financial Officer and Treasurer Effective Date: November 1, 2024 PURPOSE One of the principal purposes of the federal securities laws is to prohibit so-called “insider trading.” Insider trading generally occurs when a person uses material n

Unitil Completes Purchase of Bangor Natural Gas Company

Exhibit 99.1 Page 1 of 2 FOR RELEASE Unitil Completes Purchase of Bangor Natural Gas Company ————————————————————————————————— HAMPTON, NH, January 31, 2025: Unitil Corporation (NYSE:UTL) (unitil.com) today announced that it completed the purchase of Bangor Natural Gas Company (“Bangor”), from PHC Utilities, Inc., a subsidiary of Hope Utilities, Inc. The Stock Purchase Agreement (the “Agreement”)

Transition Services Agreement dated January 31, 2025 between Bangor Natural Gas Company and Hearthstone Holdings, Inc. (d/b/a Hope Utilities, Inc.), acknowledged by Unitil Corporation

Exhibit 10.2 TRANSITION SERVICES AGREEMENT This Transition Services Agreement (this “Agreement”), dated as of January 31, 2025 (the “Effective Date”), is made by and between Hearthstone Holdings, Inc. D/B/A Hope Utilities, Inc., a Delaware corporation (“Service Provider”), and Bangor Natural Gas Company, a Maine corporation (the “Company”). Service Provider and Company are sometimes referred to co

Exhibit 4.2 to Form 8-K dated January 29, 2025 (SEC File No. 1-8858)

Exhibit 4.2 EXECUTION VERSION THIRD AMENDED AND RESTATED NOTE $83,875,000 January 29, 2025 FOR VALUE RECEIVED, the undersigned (the “Borrower”) hereby promises to pay to CITIZENS BANK, N.A. or registered assigns (the “Lender”), in accordance with the provisions of the Agreement (as hereinafter defined), the principal amount of EIGHTY-THREE MILLION EIGHT HUNDRED SEVENTY-FIVE THOUSAND DOLLARS ($83,8

Entry into a Material Definitive Agreement, 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): January 29, 2025 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of in

Exhibit 4.3 to Form 8-K dated January 29, 2025 (SEC File No. 1-8858)

Exhibit 4.3 EXECUTION VERSION THIRD AMENDED AND RESTATED NOTE $83,875,000 January 29, 2025 FOR VALUE RECEIVED, the undersigned (the “Borrower”) hereby promises to pay to TD BANK, N.A. or registered assigns (the “Lender”), in accordance with the provisions of the Agreement (as hereinafter defined), the principal amount of EIGHTY-THREE MILLION EIGHT HUNDRED SEVENTY-FIVE THOUSAND DOLLARS ($83,875,000

Second Amendment to Third Amended and Restated Credit Agreement dated January 29, 2025 among Unitil Corporation; Bank of America, N.A., as administrative agent; and Bank of America, N.A., Citizens Bank, N.A., and TD Bank, N.A.

Exhibit 4.1 EXECUTION VERSION SECOND AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT This SECOND AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT dated as of January 29, 2025 (this “Amendment”) is by and among UNITIL CORPORATION, a New Hampshire corporation (the “Borrower”), the lenders party hereto (collectively, the “Lenders”) and BANK OF AMERICA, N.A., in its capacity as admini

AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 21, 2025

S-8 AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 21, 2025 Registration No.

Filing Fee Exhibit

Exhibit 107 CALCULATION OF FILING FEE TABLE Form S-8 (Form Type) Unitil Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit (2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be paid Equity Common Stock 457(c) 350,000 $54.

Unitil Elects a New Member of the Board of Directors

Exhibit 99.1 Page 1 of 2 FOR RELEASE Unitil Elects a New Member of the Board of Directors ————————————————————————————————— HAMPTON, NH, October 30, 2024: Unitil Corporation (NYSE:UTL) (unitil.com) today announced that its Board of Directors has elected Jane Lewis-Raymond to the Board. The addition of a new director is part of the Board’s normal succession planning process in anticipation of the u

Regulation FD Disclosure, 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): October 30, 2024 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of in

Unitil Corporation Press Release Dated November 4, 2024 Announcing Earnings For the Quarter Ended September 30, 2024.

Exhibit 99.1 Page 1 of 7 FOR RELEASE Unitil Reports Third Quarter Earnings Hampton, N.H., NOVEMBER 4, 2024 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced GAAP Net Income (Net Income) of $11 thousand, or $0.00 in Earnings Per Share (EPS), for the third quarter of 2024, a decrease of $1.4 million in Net Income, or $0.09 in EPS, compared to the third quarter of 2023. The Company’s Net

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPORATION (Exact

Seventeenth Supplemental Indenture dated August 21, 2024 by and between Unitil Energy Systems, Inc. and U.S. Bank Trust Company, National Association (as trustee)

Exhibit 4.12 Execution Version UNITIL ENERGY SYSTEMS, INC. TO U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, TRUSTEE SEVENTEENTH SUPPLEMENTAL INDENTURE DATED AS OF AUGUST 21, 2024 ADDITIONAL ISSUE OF BONDS (SERIES S, 5.69%*, DUE AUGUST 21, 2054) $40,000,000 This Seventeenth Supplemental Indenture encumbers property in Merrimack and Rockingham Counties. * 5.79% on and after the Collateral Release D

5.99% Senior Note, Series 2024B, due August 21, 2044, issued by Fitchburg Gas and Electric Light Company to Metlife Reinsurance Company of Hamilton, Ltd.

Exhibit 4.8 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS,

First Mortgage Bond, Series S, 5.69%, due August 21, 2054, issued by Unitil Energy Systems, Inc. to Metlife Reinsurance Company of Hamilton, Ltd.

Exhibit 4.13 THIS BOND HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS BOND HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS,

Note Purchase Agreement dated August 21, 2024 by and among Northern Utilities, Inc. and the several purchasers named therein.

Exhibit 4.3 NOTE: In accordance with Item 601(a)(5) of Regulation S-K, this exhibit omits certain of its schedules and exhibits. This exhibit’s table of contents includes a brief description of the subject matter of all of its schedules and exhibits, including the omitted schedules and exhibits. The Registrant acknowledges that it must provide a copy of any omitted schedules or exhibits to the Sec

5.74% Senior Note, Series 2024, due August 21, 2034, issued by Granite State Gas Transmission, Inc. to Metropolitan Life Insurance Company

Exhibit 4.10 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS,

Entry into a Material Definitive Agreement, 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): August 21, 2024 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fi

5.54% Senior Note, Series 2024A, due August 21, 2034, issued by Fitchburg Gas and Electric Light Company to Metlife Reinsurance Company of Hamilton, Ltd.

Exhibit 4.7 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS,

Note Purchase Agreement dated August 21, 2024 by and among Unitil Corporation and the several purchasers named therein.

Exhibit 4.1 NOTE: In accordance with Item 601(a)(5) of Regulation S-K, this exhibit omits certain of its schedules and exhibits. This exhibit’s table of contents includes a brief description of the subject matter of all of its schedules and exhibits, including the omitted schedules and exhibits. The Registrant acknowledges that it must provide a copy of any omitted schedules or exhibits to the Sec

5.54% Senior Note, Series 2024A, due August 21, 2034, issued by Northern Utilities, Inc. to Metropolitan Life Insurance Company

Exhibit 4.4 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS,

Note Purchase Agreement dated August 21, 2024 by and among Fitchburg Gas and Electric Light Company and the several purchasers named therein

Exhibit 4.6 NOTE: In accordance with Item 601(a)(5) of Regulation S-K, this exhibit omits certain of its schedules and exhibits. This exhibit’s table of contents includes a brief description of the subject matter of all of its schedules and exhibits, including the omitted schedules and exhibits. The Registrant acknowledges that it must provide a copy of any omitted schedules or exhibits to the Sec

Note Purchase Agreement dated August 21, 2024 by and among Granite State Gas Transmission, Inc. and the several purchasers named therein.

Exhibit 4.9 NOTE: In accordance with Item 601(a)(5) of Regulation S-K, this exhibit omits certain of its schedules and exhibits. This exhibit’s table of contents includes a brief description of the subject matter of all of its schedules and exhibits, including the omitted schedules and exhibits. The Registrant acknowledges that it must provide a copy of any omitted schedules or exhibits to the Sec

5.74% Senior Note, Series 2024B, due August 21, 2039, issued by Northern Utilities, Inc. to Modern Woodmen of America.

Exhibit 4.5 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS,

5.99% Senior Note, Series 2024, due August 21, 2034, issued by Unitil Corporation to Metropolitan Tower Life Insurance Company

Exhibit 4.2 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS,

Bond Purchase Agreement dated August 21, 2024 by and among Unitil Energy Systems, Inc., U.S. Bank Trust Company, National Association (as trustee) and the several purchasers named therein.

Exhibit 4.11 NOTE: In accordance with Item 601(a)(5) of Regulation S-K, this exhibit omits certain of its schedules and exhibits. This exhibit’s table of contents includes a brief description of the subject matter of all of its schedules and exhibits, including the omitted schedules and exhibits. The Registrant acknowledges that it must provide a copy of any omitted schedules or exhibits to the Se

Unitil Corporation Press Release Dated August 6, 2024 Announcing Earnings For the Quarter Ended June 30, 2024.

Exhibit 99.1 Page 1 of 7 FOR RELEASE Unitil Reports Second Quarter Earnings Hampton, N.H., AUGUST 6, 2024 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $4.3 million, or $0.27 in Earnings Per Share (EPS) for the second quarter of 2024, an increase of $0.1 million in Net Income, or $0.02 in EPS, compared to the second quarter of 2023. For the six months ended June 30, 2

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPORATION (Exact name

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of incor

First Amendment to Third Amended and Restated Credit Agreement between Until and Bank of America, N.A., as administrative agent, dated July 18, 2024

Exhibit 4.1 Execution Copy FIRST AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT This FIRST AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT dated as of July 18, 2024 (this “Amendment”) is by and between UNITIL CORPORATION, a New Hampshire corporation (the “Borrower”) and BANK OF AMERICA, N.A., in its capacity as administrative agent (in such capacity, the “Agent”), and amends tha

Unitil to Purchase Bangor Natural Gas Company from Hope Utilities, Inc.

Exhibit 99.1 FOR RELEASE Unitil to Purchase Bangor Natural Gas Company from Hope Utilities, Inc. ————————————————————————————————— HAMPTON, NH, July 9, 2024: Unitil Corporation (NYSE: UTL) (unitil.com) today announced that Unitil has agreed to purchase Bangor Natural Gas Company (“Bangor”) from PHC Utilities, Inc., a subsidiary of Hope Utilities, Inc., for $70.9 million on a debt-free basis, subje

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 8, 2024 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of incorp

Stock Purchase Agreement among Unitil Corporation, PHC Utilities, Inc., and Hearthstone Utilities, Inc. (d/b/a Hope Companies, Inc.) dated July 8, 2024

Exhibit 2.1 STOCK PURCHASE AGREEMENT between PHC UTILITIES, INC., UNITIL CORPORATION, and HEARTHSTONE HOLDINGS, INC., D/B/A HOPE COMPANIES, INC., dated as of July 8, 2024 TABLE OF CONTENTS ARTICLE I DEFINITIONS 1 ARTICLE II PURCHASE AND SALE 13 Section 2.01 Purchase and Sale 13 Section 2.02 Purchase Price 13 Section 2.03 Transactions to be Effected at the Closing 13 Section 2.04 Purchase Price Adj

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

Current Report

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, 2024 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File N

Unitil Corporation Press Release Dated May 7, 2024 Announcing Earnings For the Quarter Ended March 31, 2024. EX-99.1

Page 1 of 5 Exhibit 99.1 FOR RELEASE Unitil Reports First Quarter Earnings Hampton, N.H., May 7, 2024 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $27.2 million, or $1.69 in Earnings Per Share (EPS), for the quarter ended March 31, 2024, an increase of $3.1 million in Net Income, or $0.18 in EPS, compared to the same period in 2023.The Company’s Electric and Gas GAAP

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPORATION (Exact name

Employment Agreement between Unitil Corporation and Thomas P. Meissner, Jr.

Exhibit 10.1 EMPLOYMENT AGREEMENT AGREEMENT (the “Agreement”), effective as of April 25, 2024 (the “Commencement Date”), by and between UNITIL CORPORATION, a New Hampshire corporation (the “Company”), and THOMAS P. MEISSNER, JR. (the “Executive”). The Company desires to continue to employ the Executive, and the Executive is willing to continue to be employed by the Company, on the terms and condit

Exhibit 10.1 to Form 10-Q for March 31, 2024 (SEC File No. 1-8858)

Unitil Corporation Exhibit 10.1 Third Amended and Restated 2003 Stock Plan Effective: May 1, 2024 Unitil Corporation Third Amended and Restated 2003 Stock Plan ARTICLE 1 Establishment, Objectives, and Duration 1.1 Establishment of the Plan. Unitil Corporation, a corporation organized and existing under New Hampshire law (the “Company”), hereby establishes an incentive compensation plan to be known

Forward-Looking Statements Safe harbor provision This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities COMPANY INFORMATION Litigation Reform Act of 1995. These forward-looking st

Exhibit 99.1 Annual Meeting of Shareholders May 1, 2024 Forward-Looking Statements Safe harbor provision This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities COMPANY INFORMATION Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unitil Corporation’s (“Unitil”) financial condition, res

Current Report

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, 2024 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definit

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒       Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for

Unitil Corporation Corporate Governance Guidelines and Policies of the Board of Directors (includes the Registrant’s insider trading policies and procedures)

Exhibit 19.1 Unitil Corporation Corporate Governance Guidelines and Policies of the Board of Directors Last Updated on November 1, 2023 Unitil Corporation (“Unitil” or the “Company”) is committed to comprehensive and effective corporate governance practices. The Board of Directors (the “Board”) and the management team firmly believe that solid corporate governance is key to the transparent and eth

Executive Compensation Recovery Policy

System Policy Exhibit 97.1 Subject: Executive Compensation Recovery Policy To: All Executive Officers (“Covered Officers”) Policy Number: HR 1.61 From: Human Resources Effective Date: November 1, 2023 PURPOSE The purpose of this Executive Compensation Recovery Policy (the “Policy”) is to provide for the recovery of certain executive compensation in the event of an accounting restatement resulting

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-8858 UNITIL CORPORATION (Exact na

UTL / Unitil Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: Unitil Corp Title of Class of Securities: Common Stock CUSIP Number: 913259107 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule 13

Unitil Corporation Press Release Dated February 13, 2024 Announcing Earnings For the Year Ended December 31, 2023.

Page 1 of 5 Exhibit 99.1 FOR RELEASE Unitil Reports Year-End Earnings Hampton, N.H., february 13, 2024 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $45.2 million, or $2.82 in Earnings Per Share (EPS), for the year ended December 31, 2023, an increase of $3.8 million in Net Income, or $0.23 in EPS, compared to 2022. The Company’s 2023 Electric and Gas GAAP Gross Margi

Unitil Corporation - Compensation of Directors effective as of January 1, 2024

Exhibit 10.20 UNITIL CORPORATION Compensation of Directors On November 1, 2023, the Board of Directors of Unitil Corporation (“Unitil”) approved and adopted a revised compensation arrangement for members of the Board of Directors. The revised compensation arrangement became effective as of January 1, 2024. The revised compensation arrangement applies to members of the Board of Directors who are no

Statement Re: Subsidiaries of Registrant.

Exhibit 21.1 Subsidiaries of Registrant The Company or the registrant has eight wholly-owned subsidiaries, seven of which are corporations organized under the laws of the State of New Hampshire: Unitil Energy Systems, Inc., Northern Utilities, Inc., Granite State Gas Transmission, Inc., Unitil Power Corp., Unitil Realty Corp., Unitil Resources, Inc. and Unitil Service Corp. The eighth, Fitchburg G

Unitil Announces Director Resignation

Exhibit 99.1 FOR RELEASE Unitil Announces Director Resignation ————————————————————————————————— HAMPTON, NH, December 1, 2023: Unitil Corporation (NYSE: UTL) (unitil.com) today announced that Eben S. Moulton will resign as a member of the Board of Directors (the “Board”) of Unitil Corporation, effective as of today, December 1, 2023. Mr. Moulton has served on the Board since 2000, including as ch

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 1, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission F

Unitil Corporation Press Release Dated November 7, 2023 Announcing Earnings For the Quarter Ended September 30, 2023.

Page 1 of 8 Exhibit 99.1 FOR RELEASE Unitil Reports Third Quarter Earnings - Hampton, N.H., November 7, 2023 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $1.4 million, or $0.09 in Earnings Per Share (EPS) for the third quarter of 2023, an increase of $0.9 million in Net Income, or $0.06 in EPS, compared to the third quarter of 2022. For the nine months ended Septembe

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPORATION (Exact

Regulation FD Disclosure

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 1934 Date of Report (Date of earliest event reported): August 17, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of incorp

As filed with the Securities and Exchange Commission on August 16, 2023

Table of Contents As filed with the Securities and Exchange Commission on August 16, 2023 File No.

Filing Fee Exhibit

Exhibit 107 Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit (2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be paid Equity Common Stock 457(c) 200,000 $50.

Unitil Corporation Press Release Dated August 1, 2023 Announcing Earnings For the Quarter Ended June 30, 2023.

Page 1 of 8 Exhibit 99.1 FOR RELEASE Unitil Reports Second Quarter Earnings Hampton, N.H., AUGUST 1, 2023 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $4.2 million, or $0.25 in Earnings Per Share (EPS) for the second quarter of 2023, a decrease of $0.7 million in Net Income, or $0.05 in EPS, compared to the second quarter of 2022. For the six months ended June 30, 20

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPORATION (Exact name

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 6, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

5.70% Senior Note, Series 2023A, due July 2, 2033, issued by Fitchburg Gas and Electric Light Company to MetLife Reinsurance Company of Hamilton, Ltd.

EX-4.2 Exhibit 4.2 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES

Note Purchase Agreement dated July 6, 2023 by and among Fitchburg Gas and Electric Light Company and the several purchasers named therein.

EX-4.1 Exhibit 4.1 NOTE: In accordance with Item 601(a)(5) of Regulation S-K, this exhibit omits certain of its schedules and exhibits. This exhibit’s table of contents includes a brief description of the subject matter of all of its schedules and exhibits, including the omitted schedules and exhibits. The Registrant acknowledges that it must provide a copy of any omitted schedules or exhibits to

5.96% Senior Note, Series 2023B, due July 2, 2053, issued by Fitchburg Gas and Electric Light Company to Mutual of Omaha Insurance Company

EX-4.3 Exhibit 4.3 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES

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 1, 2023 UNITIL CORPORATION (

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 1, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

Unitil Corporation 10b5-1 Plan Agreement

EX-99.1 Exhibit 99.1 Unitil Corporation 2023 10b5-1 Plan Agreement This Agreement, dated June 1, 2023 (this “Instruction”), is made by and between Unitil Corporation (the “Issuer”) and Wells Fargo Clearing Services, LLC (the “Broker”). WHEREAS, Issuer desires to repurchase shares of its common stock, no par value (the “Stock”), pursuant to its Stock repurchase program; and WHEREAS, Issuer desires

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

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 26, 2023 UNITIL CORPORATION

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 26, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

Unitil Corporation Press Release Dated May 2, 2023 Announcing Earnings For the Quarter Ended March 31, 2023.

Page 1 of 5 Exhibit 99.1 FOR RELEASE Unitil Reports First Quarter Earnings Hampton, N.H., May 2, 2023 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $24.1 million, or $1.51 in Earnings Per Share (EPS), for the quarter ended March 31, 2023, an increase of $2.6 million in Net Income, or $0.16 in EPS, compared to the same period in 2022.The Company’s Electric and Gas GAAP

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPORATION (Exact name

Unitil Announces Organizational Changes

EX-99.1 Exhibit 99.1 Page 1 of 2 For Immediate Release Unitil Announces Organizational Changes ——————————————————————————— HAMPTON, NH, April 26, 2023: Unitil Corporation (“Unitil” or the “Company”) (NYSE:UTL) (unitil.com) today announced that its Board of Directors has approved several corporate organizational changes, all of which are effective as of May 1, 2023. Thomas P. Meissner, Jr., current

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

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 26, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

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 26, 2023 UNITIL CORPORATION

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 26, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

Forward-Looking Statements This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unit

EX-99.1 Annual Meeting of Shareholders April 26, 2023 Exhibit 99.1 Forward-Looking Statements This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unitil Corporation’s (“Unitil”) financial condition, results of operations, capital exp

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) o f th e Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) o f th e Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use

Statement Re: Subsidiaries of Registrant.

Exhibit 21.1 Subsidiaries of Registrant The Company or the registrant has eight wholly-owned subsidiaries, seven of which are corporations organized under the laws of the State of New Hampshire: Unitil Energy Systems, Inc., Northern Utilities, Inc., Granite State Gas Transmission, Inc., Unitil Power Corp., Unitil Realty Corp., Unitil Resources, Inc. and Unitil Service Corp. The eighth, Fitchburg G

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-8858 UNITIL CORPORATION (Exact na

Unitil Corporation Press Release Dated February 14, 2023 Announcing Earnings For the Year Ended December 31, 2022.

Exhibit 99.1 Page 1 of 6 FOR RELEASE Unitil Reports Year-End Earnings Hampton, N.H., february 14, 2023 - Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $41.4 million, or $2.59 in Earnings Per Share (EPS), for the year ended December 31, 2022, an increase of $5.3 million in Net Income, or $0.24 in EPS, compared to 2021.The Company’s Electric and Gas GAAP Gross Margins wer

UTL / Unitil Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0124-unitilcorp.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: Unitil Corp. Title of Class of Securities: Common Stock CUSIP Number: 913259107 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pu

Unitil Senior Vice President Todd R. Black Announces Intention to Retire in May 2023

Exhibit 99.1 Page 1 of 2 FOR RELEASE Unitil Senior Vice President Todd R. Black Announces Intention to Retire in May 2023 ————————————————————————————————— HAMPTON, NH, February 1, 2023: Unitil Corporation (“Unitil” or the “Company”) (NYSE:UTL) (unitil.com) today announced the planned retirement of Todd R. Black, Senior Vice President, effective May 1, 2023, capping a successful career spanning 35

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

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 1, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission F

Exhibit 10.2 to Form 8-K dated January 24, 2023 (SEC File No. 1-8858)

Exhibit 10.2 RESTRICTED STOCK AGREEMENT (PERFORMANCE VESTING) This Restricted Stock Agreement (the “Agreement”), dated as of , 20 (the “Grant Date”), between Unitil Corporation (the “Company”) and (the “Employee”), an employee of the Group (as defined in the Plan). WITNESSETH THAT: WHEREAS, the Company maintains the Unitil Corporation Amended and Restated 2003 Stock Plan (the “Plan”); and WHEREAS,

Exhibit 10.1 to Form 8-K dated January 24, 2023 (SEC File No. 1-8858)

Exhibit 10.1 RESTRICTED STOCK AGREEMENT (TIME VESTING) This Restricted Stock Agreement (the “Agreement”), dated as of , 20 (the “Grant Date”), between Unitil Corporation (the “Company”) and (the “Employee”), an employee of the Group (as defined in the Plan). WITNESSETH THAT: WHEREAS, the Company maintains the Unitil Corporation Amended and Restated 2003 Stock Plan (the “Plan”); and WHEREAS, the Co

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 24, 2023 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission F

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

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 26, 2022 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 or ☐ TRANSITION REPORT PURSUANT TO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL C

Unitil Elects a New Member of the Board of Directors

Exhibit 99.1 Page 1 of 2 FOR RELEASE Unitil Elects a New Member of the Board of Directors ????????????????????????????????? HAMPTON, NH, October 26, 2022: Unitil Corporation (NYSE:UTL) (www.unitil.com) today announced that its Board of Directors has elected Neveen F. Awad, Ph.D. to the Board. The addition of a new director is part of the Board?s normal succession planning process in anticipation o

Unitil Corporation Press Release Dated November 1, 2022 Announcing Earnings For the Quarter Ended September 30, 2022.

Page 1 of 8 Exhibit 99.1 FOR RELEASE Unitil Reports Third Quarter Earnings HAMPTON, N.H., NOVEMBER 1, 2022 ? Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $0.5 million, or $0.03 in Earnings Per Share (EPS) for the third quarter of 2022, an increase of $0.5 million in Net Income, or $0.03 in EPS, compared to the third quarter of 2021. For the nine months ended September

Second Amended and Restated Note issued to Citizens Bank, N.A.

EX-4.2 3 d325396dex42.htm EX-4.2 Exhibit 4.2 SECOND AMENDED AND RESTATED NOTE $67,500,000 September 29, 2022 FOR VALUE RECEIVED, the undersigned (the “Borrower”) hereby promises to pay to CITIZENS BANK, N.A. or registered assigns (the “Lender”), in accordance with the provisions of the Agreement (as hereinafter defined), the principal amount of SIXTY SEVEN MILLION FIVE HUNDRED THOUSAND DOLLARS ($6

Third Amended and Restated Credit Agreement dated September 29, 2022 among Unitil Corporation, Bank of America, N.A., as administrative agent, and the Lenders

Exhibit 4.1 NOTE: This exhibit includes Schedule 2.01 (Commitments and Applicable Percentages). In accordance with Item 601(a)(5) of Regulation S-K, the Registrant has omitted all other schedules and exhibits to this exhibit. This exhibit?s table of contents includes a brief description of the subject matter of all schedules and exhibits to this exhibit, including the omitted schedules and exhibit

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): September 29, 2022 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission

Second Amended and Restated Note issued to TD Bank, N.A.

Exhibit 4.3 SECOND AMENDED AND RESTATED NOTE $61,000,000 September 29, 2022 FOR VALUE RECEIVED, the undersigned (the ?Borrower?) hereby promises to pay to TD BANK, N.A. or registered assigns (the ?Lender?), in accordance with the provisions of the Agreement (as hereinafter defined), the principal amount of SIXTY-ONE MILLION DOLLARS ($61,000,000) or, if less, the principal amount of, and interest a

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPOR

Unitil Corporation Press Release Dated August 2, 2022 Announcing Earnings For the Quarter Ended June 30, 2022.

Page 1 of 8 Exhibit 99.1 FOR RELEASE Unitil Reports Second Quarter Earnings HAMPTON, N.H., AUGUST 2, 2022 ? Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $4.9 million, or $0.30 in Earnings Per Share (EPS) for the second quarter of 2022, an increase of $2.2 million in Net Income, or $0.12 in EPS, compared to the second quarter of 2021. For the six months ended June 30, 2

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

11-K 1 d370920d11k.htm 11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-8858 A. Full title of the plan an

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 12, 2022 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

THE STATE OF NEW HAMPSHIRE BEFORE THE PUBLIC UTILITIES COMMISSION Unitil Energy Systems, Inc. Rate Case Docket No. DE 21-030 SETTLEMENT AGREEMENT ON PERMANENT DISTRIBUTION RATES

Exhibit 99.3 THE STATE OF NEW HAMPSHIRE BEFORE THE PUBLIC UTILITIES COMMISSION Unitil Energy Systems, Inc. Rate Case Docket No. DE 21-030 SETTLEMENT AGREEMENT ON PERMANENT DISTRIBUTION RATES This Settlement Agreement on permanent distribution rates (?Settlement Agreement?) is entered into this 11th day of February, 2022, by and among Unitil Energy Systems, Inc. (?Unitil? or ?Company?), the New Ham

STATE OF NEW HAMPSHIRE PUBLIC UTILITIES COMMISSION DE 21-030 UNITIL ENERGY SYSTEMS, INC. Request for Change in Rates Order on Expedited Motion for Clarification O R D E R N O. 26,625 May 12, 2022

Exhibit 99.2 STATE OF NEW HAMPSHIRE PUBLIC UTILITIES COMMISSION DE 21-030 UNITIL ENERGY SYSTEMS, INC. Request for Change in Rates Order on Expedited Motion for Clarification O R D E R N O. 26,625 May 12, 2022 In this order the Commission clarifies that the annual revenue requirement approved in Order No. 26,623 shall be $5,883,395. This clarification and amendment is related to the arrearage manag

STATE OF NEW HAMPSHIRE PUBLIC UTILITIES COMMISSION DE 21-030 UNITIL ENERGY SYSTEMS, INC. Request For Change in Rates Order Approving Settlement Agreement, In Part, and Approving Permanent Rates O R D E R N O. 26,623 May 3, 2022

Exhibit 99.1 STATE OF NEW HAMPSHIRE PUBLIC UTILITIES COMMISSION DE 21-030 UNITIL ENERGY SYSTEMS, INC. Request For Change in Rates Order Approving Settlement Agreement, In Part, and Approving Permanent Rates O R D E R N O. 26,623 May 3, 2022 This order approves a permanent distribution rate increase for Unitil Energy Systems of $6.33 million, effective for service rendered on or after June 1, 2022,

Computation in Support of Earnings Per Average Common Share Outstanding

EXHIBIT 11 UNITIL CORPORATION AND SUBSIDIARY COMPANIES COMPUTATION OF EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ($ Millions, except for per share data) (UNAUDITED) Three Months Ended March 31, 2022 2021 Net Income $ 21.

Unitil Corporation 10b5-1 Plan Agreement

Exhibit 99.1 Unitil Corporation 2022 10b5-1 Plan Agreement This Agreement, dated May 1, 2022 (this ?Instruction?), is made by and between Unitil Corporation (the ?Issuer?) and Wells Fargo Clearing Services, LLC (the ?Broker?). WHEREAS, Issuer desires to repurchase shares of its common stock, no par value (the ?Stock?), pursuant to its Stock repurchase program; and WHEREAS, Issuer desires to appoin

Unitil Corporation Press Release Dated May 3, 2022 Announcing Earnings For the Quarter Ended March 31, 2022.

Page 1 of 6 Exhibit 99.1 FOR RELEASE Unitil Reports First Quarter Earnings HAMPTON, N.H., MAY 3, 2022 ? Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $21.5 million, or $1.35 in Earnings Per Share (EPS), for the quarter ended March 31, 2022, an increase of $2.6 million in Net Income, or $0.09 in EPS, compared to the same period in 2021.The Company?s Electric and Gas GAAP

Regulation FD Disclosure, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 27, 2022 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SEC

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL COR P

Regulation FD Disclosure, 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 27, 2022 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of inco

Safe Harbor Provision This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unitil Co

Annual Meeting of Shareholders April 27, 2022 Exhibit 99.1 Safe Harbor Provision This presentation contains ?forward-looking statements? made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unitil Corporation?s (?Unitil?) financial condition, results of operations, capital expenditures, bu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confid

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 14, 2022 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

UTL / Unitil Corporation / CAISSE DE DEPOT ET PLACEMENT DU QUEBEC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 UNITIL CORPORATION (Name of Issuer) Common Stock (Title of Class of Securities) 913259107 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ?

UTL / Unitil Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)* Name of issuer: Unitil Corp. Title of Class of Securities: Common Stock CUSIP Number: 913259107 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule 1

Statement Re: Subsidiaries of Registrant.

Exhibit 21.1 Subsidiaries of Registrant The Company or the registrant has eight wholly-owned subsidiaries, seven of which are corporations organized under the laws of the State of New Hampshire: Unitil Energy Systems, Inc., Northern Utilities, Inc., Granite State Gas Transmission, Inc., Unitil Power Corp., Unitil Realty Corp., Unitil Resources, Inc. and Unitil Service Corp. The eighth, Fitchburg G

Unitil Corporation—Compensation of Directors effective as of January 1, 2022.

Exhibit 10.21 UNITIL CORPORATION Compensation of Directors On October 27, 2021, the Board of Directors of Unitil Corporation (?Unitil?) approved and adopted a revised compensation arrangement for members of the Board of Directors. The revised compensation arrangement became effective as of January 1, 2022. The revised compensation arrangement applies to members of the Board of Directors who are no

Description of Registrant’s Securities

Exhibit 4.50 DESCRIPTION OF THE REGISTRANT?S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Unitil Corporation (the ?Registrant?) has one class of common stock registered under Section 12 of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?). The following is a description of our common stock. This description is a summary and does not purport

Unitil Corporation Press Release Dated February 1, 2022 Announcing Earnings For the Year Ended December 31, 2021.

Exhibit 99.1 Page 1 of 6 FOR RELEASE Unitil Reports Year-End Earnings HAMPTON, N.H., FEBRUARY 1, 2022 ? Unitil Corporation (NYSE: UTL) (unitil.com) today announced Net Income of $36.1 million, or $2.35 in Earnings Per Share (EPS), for the year ended December 31, 2021, an increase of $3.9 million in Net Income, or $0.20 in EPS, compared to 2020.The Company?s Electric and Gas GAAP Gross Margins were

Unitil Corporation Tax Deferred Savings and Investment Plan, as amended and restated effective as of January 1, 2021.

EX-10.15 Exhibit 10.15 Unitil Corporation Tax Deferred Savings and Investment Plan (as amended and restated) Effective January 1, 2021 UNITIL CORPORATION TAX DEFERRED SAVINGS AND INVESTMENT PLAN UNITIL CORPORATION TAX DEFERRED SAVINGS AND INVESTMENT PLAN WHEREAS, Unitil Corporation (hereinafter referred to as the “Employer”) heretofore adopted the Unitil Corporation Tax Deferred Savings and Invest

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-8858 UNITIL COR

Statement Re: Computation in Support of Earnings per Share for the Company.

EX-11.1 Exhibit 11.1 UNITIL CORPORATION COMPUTATION IN SUPPORT OF EARNINGS PER SHARE Year Ended December 31, 2021 2020 2019 EARNINGS PER SHARE (000’s, except per share data) Net Income $ 36,084 $ 32,166 $ 44,238 Less: Dividend Requirements on Preferred Stock 11 11 11 Net Income Applicable to Common Stock $ 36,073 $ 32,155 $ 44,227 Average Number of Common Shares Outstanding - Basic 15,373 14,951 1

Computation of Earnings Per Average Common Share

EXHIBIT 11 UNITIL CORPORATION AND SUBSIDIARY COMPANIES COMPUTATION OF EARNINGS PER WEIGHTED AVERAGE COMMON SHARE OUTSTANDING (Millions except common shares and per share data) (UNAUDITED) Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net Income $ ? $ 0.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ☐ TRANSITION REPORT PURSUANT TO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL C

Unitil Corporation Press Release Dated November 2, 2021 Announcing Earnings For the Quarter Ended September 30, 2021.

Page 1 of 8 Exhibit 99.1 FOR RELEASE Unitil Reports Third Quarter Earnings HAMPTON, N.H., NOVEMBER 2, 2021 ? Unitil Corporation (NYSE: UTL) (Unitil.com) today announced breakeven Net Income and earnings per share (EPS) for the third quarter of 2021, a decrease of $0.3 million in Net Income, or $0.02 in EPS, compared to the third quarter of 2020. For the nine months ended September 30, 2021, the Co

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered(1) Maximum Offering Price Per Share Maximum Aggregate Offering Price Amount of Registration Fee(2) Common stock, no par value 920,000 $50.80 $4

Table of Contents Filed Pursuant to Rule 424(b)(5) File No. 333-258405 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered(1) Maximum Offering Price Per Share Maximum Aggregate Offering Price Amount of Registration Fee(2) Common stock, no par value 920,000 $50.80 $46,736,000 5,098.90 (1) Assumes exercise in full of the underwriters? option to

Unitil Announces Public Offering of Common Stock

Exhibit 99.1 Page 1 of 2 FOR IMMEDIATE RELEASE Unitil Announces Public Offering of Common Stock HAMPTON, N.H., AUGUST 3, 2021 ? Unitil Corporation (NYSE: UTL) (www.unitil.com) announced today that it plans to make an underwritten public offering of 800,000 newly issued shares of common stock pursuant to an effective shelf registration statement on Form S-3 filed with the Securities and Exchange Co

Underwriting Agreement dated August 4, 2021 among Unitil Corporation, on the one hand, and RBC Capital Markets, LLC and BofA Securities, Inc., on the other hand, for themselves and as representatives of the several underwriters named therein.

Exhibit 1.1 Execution Version Unitil Corporation 800,000 Shares Common Stock (No Par Value) Underwriting Agreement New York, New York August 4, 2021 RBC Capital Markets, LLC BofA Securities, Inc. As Representatives of the several underwriters named in Schedule I hereto c/o RBC Capital Markets, LLC 200 Vesey Street New York, New York 10281-8098 c/o BofA Securities, Inc. One Bryant Park New York, Ne

Unitil Announces Pricing of Public Offering of Common Stock

Exhibit 99.2 Page 1 of 2 FOR IMMEDIATE RELEASE Unitil Announces Pricing of Public Offering of Common Stock HAMPTON, N.H., AUGUST 4, 2021 ? Unitil Corporation (NYSE: UTL) (www.unitil.com) announced today that it priced a public offering of 800,000 newly issued shares of common stock pursuant to an effective shelf registration statement on Form S-3 filed with the Securities and Exchange Commission a

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): August 3, 2021 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ☐ TRANSITION REPORT PURSUANT TO SECT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPOR

Subject to Completion, dated August 3, 2021

Table of Contents The information in this preliminary prospectus supplement and the accompanying prospectus is not complete and may be changed.

Computation of Earnings Per Average Common Share

EXHIBIT 11 UNITIL CORPORATION AND SUBSIDIARY COMPANIES COMPUTATION OF EARNINGS PER WEIGHTED AVERAGE COMMON SHARE OUTSTANDING (Millions except common shares and per share data) (UNAUDITED) Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net Income $ 2.

Unitil Corporation Press Release Dated August 3, 2021 Announcing Earnings For the Quarter Ended June 30, 2021.

Page 1 of 8 Exhibit 99.1 FOR RELEASE Unitil Reports Second Quarter Earnings HAMPTON, N.H., AUGUST 3, 2021 ? Unitil Corporation (NYSE: UTL) (www.unitil.com) today announced Net Income was $2.7 million, or $0.18 in Earnings Per Share (EPS), for the second quarter of 2021, a decrease of $0.4 million in Net Income, or $0.03 per share, compared to the second quarter of 2020. For the second quarter of 2

As filed with the Securities and Exchange Commission on August 3, 2021

Table of Contents As filed with the Securities and Exchange Commission on August 3, 2021 Registration No.

Unitil Commits to Net-Zero Emissions Goal by 2050 Goal includes 50 percent reduction in emissions by 2030

Exhibit 99.1 Page 1 of 2 FOR RELEASE Unitil Commits to Net-Zero Emissions Goal by 2050 Goal includes 50 percent reduction in emissions by 2030 HAMPTON, N.H., JUNE 21, 2021 ? Unitil Corporation (the ?Company?) (NYSE: UTL) (unitil.com) today announced its commitment to reduce company-wide direct greenhouse gas emissions from 2019 levels by at least 50 percent by 2030, and to net-zero emissions by 20

Regulation FD Disclosure, 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): June 21, 2021 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ? ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-8858 A. Full title of the plan and the address of the plan, i

Employment Agreement effective April 25, 2021 between Unitil Corporation and Thomas P. Meissner, Jr.

Exhibit 10.1 EMPLOYMENT AGREEMENT AGREEMENT (the ?Agreement?), effective as of April 25, 2021 (the ?Commencement Date?), by and between UNITIL CORPORATION, a New Hampshire corporation (the ?Company?), and THOMAS P. MEISSNER, JR. (the ?Executive?). The Company desires to continue to employ the Executive, and the Executive is willing to continue to be employed by the Company, on the terms and condit

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPO

Unitil Reports First Quarter Earnings

Page 1 of 7 Exhibit 99.1 FOR RELEASE Unitil Reports First Quarter Earnings HAMPTON, N.H., MAY 4, 2021 ? Unitil Corporation (the ?Company?) (NYSE: UTL) (www.unitil.com) today announced Net Income of $18.9 million, or $1.26 in Earnings Per Share (EPS), for the first quarter of 2021, an increase of $3.7 million in Net Income, or $0.24 per share, compared to the first quarter of 2020. The Company?s ea

Computation in Support of Earnings Per Average Common Share Outstanding

EXHIBIT 11 UNITIL CORPORATION AND SUBSIDIARY COMPANIES COMPUTATION OF EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ($ Millions, except for per share data) (UNAUDITED) Three Months Ended March 31, 2021 2020 Net Income $ 18.

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, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 28, 2021 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

Unitil Corporation 10b5-1 Plan Agreement

Exhibit 99.1 Unitil Corporation 2021 10b5-1 Plan Agreement This Agreement, dated May 1, 2021 (this ?Instruction?), is made by and between Unitil Corporation (the ?Issuer?) and Wells Fargo Clearing Services, LLC (the ?Broker?). WHEREAS, Issuer desires to repurchase shares of its common stock, no par value (the ?Stock?), pursuant to its Stock repurchase program; and WHEREAS, Issuer desires to appoin

Safe Harbor Provision This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unitil Co

EX-99.1 2 d180205dex991.htm EX-99.1 Annual Meeting of Shareholders April 28, 2021 Achieving Our Energy Vision Exhibit 99.1 Safe Harbor Provision This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unitil Corporation’s (“Unitil”) fina

Regulation FD Disclosure, 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 28, 2021 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

Regulation FD Disclosure, 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 2, 2021 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

Unitil Files for a Change in Electric Distribution Rates for New Hampshire Customers

EX-99.1 Exhibit 99.1 Page 1 of 2 FOR RELEASE Unitil Files for a Change in Electric Distribution Rates for New Hampshire Customers HAMPTON, N.H., APRIL 2, 2021 — Unitil Corporation (NYSE: UTL) (www.unitil.com) announced today that its New Hampshire electric distribution utility, Unitil Energy Systems, Inc., (“UES” or the “Company”) filed a base rate case with the New Hampshire Public Utilities Comm

definitive proxy statement

Table of Contents SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 11, 2021 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

UNITIL SENIOR VICE PRESIDENT LAURENCE M. BROCK ANNOUNCES INTENTION TO RETIRE IN JULY 2021

Page 1 of 2 Exhibit 99.1 FOR RELEASE UNITIL SENIOR VICE PRESIDENT LAURENCE M. BROCK ANNOUNCES INTENTION TO RETIRE IN JULY 2021 HAMPTON, NH, March 11, 2021: Unitil Corporation (?Unitil? or the ?Company?) (NYSE:UTL) (www.unitil.com) today announced the planned retirement of Laurence M. Brock, Senior Vice President, effective July 1, 2021, capping a remarkable career spanning 40 years in the regulate

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 UNITIL CORPORATION (Name of Issuer) Common Stock (Title of Class of Securities) 913259107 (CUSIP Number) December 31, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☐

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 4)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 4)* Name of issuer: Unitil Corp. Title of Class of Securities: Common Stock CUSIP Number: 913259107 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule 1

Unitil Corporation—Compensation of Directors effective as of January 1, 2021.

EX-10.24 Exhibit 10.24 UNITIL CORPORATION Compensation of Directors On October 28, 2020, the Board of Directors of Unitil Corporation (“Unitil”) approved and adopted a revised compensation arrangement for members of the Board of Directors. The revised compensation arrangement became effective as of January 1, 2021. The revised compensation arrangement applies to members of the Board of Directors w

Amendment to Unitil Corporation Tax Deferred Savings and Investment Plan.

EX-10.20 Exhibit 10.20 AMENDMENT TO UNITIL CORPORATION TAX DEFERRED SAVINGS AND INVESTMENT PLAN WHEREAS, Unitil Corporation (the “Employer”) sponsors the Unitil Corporation Tax Deferred Savings and Investment Plan (the “Plan”); and WHEREAS, the Employer reserved the right to amend the Plan; and WHEREAS, the Employer desires to amend the Plan to modify (i) the in-service hardship withdrawal provisi

Description of Registrant’s Securities

EX-4.51 Exhibit 4.51 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of December 31, 2020, Unitil Corporation (the “Registrant”) had one class of common stock registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The following is a description of our common stock. This description

Mortgage and Security Agreement dated December 18, 2020 between Unitil Realty Corp. and TD Bank, N.A.

EX-4.49 Exhibit 4.49 MORTGAGE AND SECURITY AGREEMENT Dated: December 18, 2020 from UNITIL REALTY CORP., Mortgagor a New Hampshire corporation, having an office at: 6 Liberty Lane West Hampton, New Hampshire 03842 to TD BANK, N.A., Mortgagee a national banking association having an office at: 300 Franklin Street Manchester, New Hampshire 03101 This document serves as a Fixture Filing under the New

Loan Agreement dated December 18, 2020 between Unitil Realty Corp. and TD Bank, N.A.

EX-4.48 Exhibit 4.48 LOAN AGREEMENT Dated: As of December 18, 2020 Between UNITIL REALTY CORP. (“Borrower”) and TD BANK, N.A. (“Lender”) $4,720,000 TERM LOAN SECURED BY PROPERTY LOCATED AT 6 Liberty Lane West, Hampton, Rockingham County, New Hampshire LOAN AGREEMENT This is an agreement (“Loan Agreement” or “Agreement”) made and entered into as of the 18th day of December, 2020, by and between UNI

Statement Re: Computation in Support of Earnings per Share for the Company.

EX-11.1 Exhibit 11.1 UNITIL CORPORATION COMPUTATION IN SUPPORT OF EARNINGS PER SHARE Year Ended December 31, 2020 2019 2018 EARNINGS PER SHARE (000’s, except per share data) Net Income $ 32,166 $ 44,238 $ 33,041 Less: Dividend Requirements on Preferred Stock 11 11 11 Net Income Applicable to Common Stock $ 32,155 $ 44,227 $ 33,030 Average Number of Common Shares Outstanding—Basic 14,951 14,894 14,

Unitil Corporation Press Release Dated February 2, 2021 Announcing Earnings For the Year Ended December 31, 2020.

EX-99.1 Page 1 of 5 Exhibit 99.1 FOR RELEASE Unitil Reports Year-end Earnings HAMPTON, N.H., FEBRUARY 2, 2021 — Unitil Corporation (NYSE: UTL) (www.unitil.com) today announced Net Income of $32.2 million, or $2.15 in Earnings Per Share, for the year ended December 31, 2020, a decrease of $12.0 million, or $0.82 per share, compared to 2019. In the first quarter of 2019, the Company recognized a one

Statement Re: Subsidiaries of Registrant.

EX-21.1 Exhibit 21.1 Subsidiaries of Registrant The Company or the registrant has eight wholly-owned subsidiaries, seven of which are corporations organized under the laws of the State of New Hampshire: Unitil Energy Systems, Inc., Northern Utilities, Inc., Granite State Gas Transmission, Inc., Unitil Power Corp., Unitil Realty Corp., Unitil Resources, Inc. and Unitil Service Corp. The eighth, Fit

Mortgage Loan Note dated December 18, 2020 issued to TD Bank, N.A.

EX-4.50 Exhibit 4.50 MORTGAGE LOAN NOTE Date of Note: December 18, 2020 Principal Amount: $4,720,000 Definitions Business Day: Any day (other than Saturday, Sunday, federal holiday, or a day on which commercial banks in the State are required or permitted to close) on which Lender is open and conducting its customary banking transactions Default Rate A rate of interest equal to the Interest Rate p

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-8858 UNITIL COR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 UNITIL CORPORATION (Name of Issuer) Common Stock (Title of Class of Securities) 913259107 (CUSIP Number) December 4, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☐ Rul

173 FERC ¶ 61,191 FEDERAL ENERGY REGULATORY COMMISSION WASHINGTON, DC 20426 November 30, 2020 In Reply Refer To: Granite State Gas Transmission, Inc. Docket No. RP21-72-000

EX-99.1 Exhibit 99.1 173 FERC ¶ 61,191 FEDERAL ENERGY REGULATORY COMMISSION WASHINGTON, DC 20426 November 30, 2020 In Reply Refer To: Granite State Gas Transmission, Inc. Docket No. RP21-72-000 Randall S. Rich, Esq. Valerie Green, Esq. Pierce Atwood, LLP 1875 K Street, NW Suite 700 Washington, DC 20006 Gary Epler Carlton B. Simpson Unitil Service Corporation 6 Liberty Lane West Hampton, NH 03842 D

Regulation FD Disclosure, 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 30, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL C

Computation in Support of Earnings Per Weighted Average Common Share

EX-11 EXHIBIT 11 UNITIL CORPORATION AND SUBSIDIARY COMPANIES COMPUTATION OF EARNINGS PER WEIGHTED AVERAGE COMMON SHARE OUTSTANDING (Millions except common shares and per share data) (UNAUDITED) Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Net Income $ 0.

Unitil Corporation Press Release Dated October 29, 2020 Announcing Earnings For the Quarter Ended September 30, 2020.

EX-99.1 Page 1 of 8 Exhibit 99.1 FOR RELEASE Unitil Reports Third Quarter Earnings HAMPTON, N.H., OCTOBER 29, 2020 — Unitil Corporation (NYSE: UTL) (www.unitil.com) today announced Net Income of $0.3 million, or $0.02 in Earnings Per Share (EPS), for the third quarter of 2020, a decrease of $2.0 million in Net Income, or $0.13 per share, compared to the third quarter of 2019, driven by lower gas a

Note Purchase Agreement dated September 15, 2020 by and among Fitchburg Gas and Electric Light Company and the several purchasers named therein.

EX-4.3 Exhibit 4.3 Execution Version FITCHBURG GAS AND ELECTRIC LIGHT COMPANY $27,500,000 3.78% Senior Notes, Series 2020A, due September 15, 2040 NOTE PURCHASE AGREEMENT Dated as of September 15, 2020 TABLE OF CONTENTS SECTION HEADING PAGE SECTION 1. AUTHORIZATION OF NOTES 1 SECTION 2. SALE AND PURCHASE OF NOTES 1 SECTION 3. CLOSING 1 SECTION 4. CONDITIONS TO CLOSING 2 Section 4.1. Representation

First Mortgage Bond, Series R, 3.58%, due September 15, 2040, issued by Unitil Energy Systems, Inc. to CUDD and CO (as nominee for Symetra Life Insurance Company).

EX-4.7 Exhibit 4.7 THIS BOND HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS BOND HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES

Sixteenth Supplemental Indenture dated September 15, 2020 by and between Unitil Energy Systems, Inc. and U.S. Bank National Association (as trustee).

EX-4.6 Exhibit 4.6 Execution Version UNITIL ENERGY SYSTEMS, INC. TO U.S. BANK NATIONAL ASSOCIATION, TRUSTEE SIXTEENTH SUPPLEMENTAL INDENTURE DATED AS OF SEPTEMBER 15, 2020 ADDITIONAL ISSUE OF BONDS (SERIES R, 3.58%, DUE SEPTEMBER 15, 2040) $27,500,000 This Sixteenth Supplemental Indenture encumbers property in Merrimack and Rockingham Counties. This Sixteenth Supplemental Indenture is dated as of

3.78% Senior Note, Series 2020A, due September 15, 2040, issued by Fitchburg Gas and Electric Light Company to Brighthouse Life Insurance Company of NY.

EX-4.4 Exhibit 4.4 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES

Bond Purchase Agreement dated September 15, 2020 by and among Unitil Energy Systems, Inc., U.S. Bank National Association (as trustee), and the several purchasers named therein.

EX-4.5 Exhibit 4.5 Execution Version UNITIL ENERGY SYSTEMS, INC. $27,500,000 AGGREGATE PRINCIPAL AMOUNT OF FIRST MORTGAGE BONDS, SERIES R, DUE SEPTEMBER 15, 2040 BOND PURCHASE AGREEMENT DATED AS OF SEPTEMBER 15, 2020 TABLE OF CONTENTS Section Heading Page SECTION 1. AUTHORIZATION OF SERIES R BONDS 1 SECTION 2. SALE AND PURCHASE OF SERIES R BONDS 1 SECTION 3. CLOSING 2 SECTION 4. CONDITIONS TO CLOS

Note Purchase Agreement dated September 15, 2020 by and among Northern Utilities, Inc. and the several purchasers named therein.

EX-4.1 Exhibit 4.1 Execution Version NORTHERN UTILITIES, INC. $40,000,000 3.78% Senior Notes, Series 2020, due September 15, 2040 NOTE PURCHASE AGREEMENT Dated as of September 15, 2020 TABLE OF CONTENTS SECTION HEADING PAGE SECTION 1. AUTHORIZATION OF NOTES 1 SECTION 2. SALE AND PURCHASE OF NOTES 1 SECTION 3. CLOSING 1 SECTION 4. CONDITIONS TO CLOSING 2 Section 4.1. Representations and Warranties

3.78% Senior Note, Series 2020, due September 15, 2040, issued by Northern Utilities, Inc. to Metropolitan Life Insurance Company.

EX-4.2 Exhibit 4.2 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR APPLICABLE STATE SECURITIES LAWS. THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 15, 2020 UNITIL CORPORA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 15, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

Severance Agreement dated July 29, 2020, between the Company and Robert B. Hevert.

EX-10.1 Exhibit 10.1 UNITIL CORPORATION SEVERANCE AGREEMENT THIS AGREEMENT, dated this 29th day of July, 2020 made effective as of the date on which a Change in Control (as defined in paragraph 2) occurs, by and among Unitil Corporation (“Unitil”), a New Hampshire corporation, Unitil Service Corp., a New Hampshire corporation and a wholly-owned subsidiary of Unitil (“Subsidiary”) (Unitil and Subsi

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORPOR

Computation in Support of Earnings Per Weighted Average Common Share

EX-11 EXHIBIT 11 UNITIL CORPORATION AND SUBSIDIARY COMPANIES COMPUTATION OF EARNINGS PER WEIGHTED AVERAGE COMMON SHARE OUTSTANDING (Millions except common shares and per share data) (UNAUDITED) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Net Income $ 3.

Unitil Corporation Press Release Dated July 30, 2020 Announcing Earnings For the Quarter Ended June 30, 2020.

EX-99.1 Page 1 of 8 Exhibit 99.1 FOR RELEASE Unitil Reports Second Quarter Earnings HAMPTON, N.H., JULY 30, 2020 — Unitil Corporation (NYSE: UTL) (www.unitil.com) today announced Net Income of $3.1 million, or $0.21 in Earnings Per Share (EPS), for the second quarter of 2020, a decrease of $0.9 million in Net Income, or $0.06 per share, compared to the second quarter of 2019, driven by lower gas s

- 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

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

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 18, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

Unitil Announces Hiring of Chief Financial Officer and Treasurer

EX-99.1 Exhibit 99.1 Page 1 of 2 FOR RELEASE Unitil Announces Hiring of Chief Financial Officer and Treasurer HAMPTON, NH, June 18, 2020: Unitil Corporation (“Unitil” or the “Company”) (NYSE:UTL) (www.unitil.com) today announced the hiring of Robert B. Hevert, CFA, as Senior Vice President, effective July 23, 2020. It is anticipated that Unitil’s Board of Directors will appoint Mr. Hevert to the p

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 16, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

Unitil Corporation 10b5-1 Plan Agreement

EX-99.1 Exhibit 99.1 Unitil Corporation 2020 10b5-1 Plan Agreement This Agreement, dated May 1, 2020 (this “Instruction”), is made by and between Unitil Corporation (the “Issuer”) and Wells Fargo Clearing Services, LLC (the “Broker”). WHEREAS, Issuer desires to repurchase shares of its common stock, no par value (the “Stock”), pursuant to its Stock repurchase program; and WHEREAS, Issuer desires t

Regulation FD Disclosure, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 29, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

Fourth Amended and Restated By-Laws of Unitil Corporation

EX-3.1 Exhibit 3.1 FOURTH AMENDED AND RESTATED BY-LAWS OF UNITIL CORPORATION ARTICLE I ◆ STOCKHOLDERS’ MEETINGS The annual meeting of the stockholders of Unitil Corporation shall be held on such date as a majority of the Board of Directors, in their discretion, shall determine; and special meetings of the stockholders shall be held whenever the Chair of the Board of Directors or a majority of the

Unitil Corporation Fourth Amended and Restated By-Laws, marked to show amendments to the Unitil Corporation Third Amended and Restated By-Laws

EX-3.2 Exhibit 3.2 THIRD FOURTH AMENDED AND RESTATED BY-LAWS OF UNITIL CORPORATION ARTICLE I ◆ STOCKHOLDERS‘ MEETINGS The annual meeting of the stockholders of Unitil Corporation shall be held on asuch date within the last two weeks of April of each year as a majority of the Board of Directors, in their discretion, shall determine annually; and special meetings of the stockholders shall be held wh

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31 , 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-8858 UNITIL CORP

Unitil Corporation Press Release Dated April 30, 2020 Announcing Earnings For the Quarter Ended March 31, 2020.

EX-99.1 Exhibit 99.1 Page 1 of 6 FOR RELEASE Unitil Reports First Quarter Earnings HAMPTON, N.H., APRIL 30, 2020 — Unitil Corporation (the “Company”) (NYSE: UTL) (www.unitil.com) today announced Net Income of $15.2 million, or $1.02 in earnings per share (EPS), for the first quarter of 2020, a decrease of $11.3 million in Net Income, or $0.76 per share, compared to the first quarter of 2019. In th

Computation in Support of Earnings Per Average Common Share

EX-11 EXHIBIT 11 UNITIL CORPORATION AND SUBSIDIARY COMPANIES COMPUTATION OF EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ($ Millions, except for per share data) (UNAUDITED) Three Months Ended March 31, 2020 2019 Net Income $ 15.

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 17, 2020 UNITIL CORPORATION

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 17, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

DEPARTMENT OF PUBLIC UTILITIES

EX-99.1 Exhibit 99.1 DEPARTMENT OF PUBLIC UTILITIES D.P.U. 19-130 April 17, 2020 Petition of Fitchburg Gas and Electric Light Company d/b/a Unitil (Electric Division), pursuant to G.L. c. 164, § 94 and 220 CMR 5.00, for Approval of a General Increase in Electric Base Distribution Rates. ORDER ON PROPOSED SETTLEMENT APPEARANCES: Gary Epler, Chief Regulatory Counsel Unitil Service Corporation 6 Libe

BARTLETT, Chair; WILLIAMSON and DAVIS, Commissioners

EX-99.1 Exhibit 99.1 STATE OF MAINE PUBLIC UTILITIES COMMISSION Docket No. 2019-00092 March 26, 2020 NORTHERN UTILITIES, INC. d/b/a UNITIL Request for Approval of Rate Change (35—A M.R.S. § 307) ORDER (Part I) BARTLETT, Chair; WILLIAMSON and DAVIS, Commissioners I. SUMMARY With this Order (Part I), under 35-A M.R.S. § 307 the Commission approves an annual base-rate revenue requirement for Northern

BARTLETT, Chair; WILLIAMSON and DAVIS, Commissioners Table of Contents I.   SUMMARY 1 II. PROCEDURAL BACKGROUND 1 III.  LEGAL STANDARD 4 A. Just and Reasonable Rates 4 B. The Prudence Standard 5 IV.  ISSUES NOT IN DISPUTE 7 A. Prior Rate-Case Expense

EX-99.2 Exhibit 99.2 STATE OF MAINE PUBLIC UTILITIES COMMISSION Docket No. 2019-00092 April 1, 2020 NORTHERN UTILITIES, INC. d/b/a UNITIL Request for Approval of Rate Change (35-A M.R.S. § 307) ORDER (Part II) (Public/Redacted) BARTLETT, Chair; WILLIAMSON and DAVIS, Commissioners Table of Contents I.   SUMMARY 1 II. PROCEDURAL BACKGROUND 1 III.  LEGAL STANDARD 4 A. Just and Reasonable Rates 4 B. T

Regulation FD Disclosure, 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): March 26, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

UTL / Unitil Corp. DEF 14A - - DEF 14A

DEF 14A Table of Contents SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

Regulation FD Disclosure, 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): March 26, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 19, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission Fil

Severance Agreement dated March 23, 2020, between the Company and Daniel J. Hurstak.

EX-10.1 Exhibit 10.1 UNITIL CORPORATION SEVERANCE AGREEMENT THIS AGREEMENT, dated this 23rd day of March, 2020 made effective as of the date on which a Change in Control (as defined in paragraph 2) occurs, by and among Unitil Corporation (“Unitil”), a New Hampshire corporation, Unitil Service Corp., a New Hampshire corporation and a wholly-owned subsidiary of Unitil (“Subsidiary”) (Unitil and Subs

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CORRESP VIA EDGAR March 23, 2020 Via EDGAR United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

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

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 1934 Date of Report (Date of earliest event reported): March 16, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File N

UNITIL ANNOUNCES RESIGNATION OF SENIOR VICE PRESIDENT, CFO AND TREASURER AND APPOINTMENT OF INTERIM CFO AND TREASURER

EX-99.1 Exhibit 99.1 Page 1 of 1 FOR RELEASE UNITIL ANNOUNCES RESIGNATION OF SENIOR VICE PRESIDENT, CFO AND TREASURER AND APPOINTMENT OF INTERIM CFO AND TREASURER HAMPTON, NH, March 16, 2020: Unitil Corporation (“Unitil” or the “Company”) (NYSE:UTL) (www.unitil.com) today announced the resignation of Christine L. Vaughan, Senior Vice President, Chief Financial Officer (“CFO”) and Treasurer, effect

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 4, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission File

SAFE HARBOR PROVISION This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unitil Co

EX-99.1 BofA Securities 2020 Power, Gas and Solar Leaders Conference March 4, 2020 Exhibit 99.1 SAFE HARBOR PROVISION This presentation contains “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements regarding Unitil Corporation’s (“Unitil”) financial condition, results of

DEPARTMENT OF PUBLIC UTILITIES

EX-99.1 Exhibit 99.1 DEPARTMENT OF PUBLIC UTILITIES D.P.U. 19-131 February 28, 2020 Petition of Fitchburg Gas and Electric Light Company d/b/a Unitil (Gas Division), pursuant to G.L. c. 164, § 94 and 220 CMR 5.00, for Approval of a General Increase in Gas Base Distribution Rates. ORDER ON PROPOSED SETTLEMENT APPEARANCES: Gary Epler, Chief Regulatory Counsel Unitil Service Corporation 6 Liberty Lan

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 28, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction of incorporation) (Commission

COMMONWEALTH OF MASSACHUSETTS DEPARTMENT OF PUBLIC UTILITIES Petition of Fitchburg Gas and Electric Light Company d/b/a Unitil (Gas Division), pursuant to G.L. c. 164, § 94 and 200 C.M.R. § 5.00, for Approval of a General Increase in Gas Base Distrib

EX-99.2 Exhibit 99.2 COMMONWEALTH OF MASSACHUSETTS DEPARTMENT OF PUBLIC UTILITIES Petition of Fitchburg Gas and Electric Light Company d/b/a Unitil (Gas Division), pursuant to G.L. c. 164, § 94 and 200 C.M.R. § 5.00, for Approval of a General Increase in Gas Base Distribution Rates D.P.U. 19-131 SETTLEMENT AGREEMENT WHEREAS, Fitchburg Gas and Electric Light Company d/b/a Unitil (“Unitil” or the “C

UTL / Unitil Corp. / FRONTIER CAPITAL MANAGEMENT CO LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No.

UTL / Unitil Corp. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 3)* Name of issuer: Unitil Corp Title of Class of Securities: Common Stock CUSIP Number: 913259107 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule 13

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, 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): January 29, 2020 UNITIL CORPORATION (Exact name of registrant as specified in its charter) New Hampshire 1-8858 02-0381573 (State or other jurisdiction (Commission (IRS Employer of in

UNITIL ELECTS A NEW MEMBER OF THE BOARD OF DIRECTORS

EX-99.1 Exhibit 99.1 Page 1 of 2 FOR RELEASE UNITIL ELECTS A NEW MEMBER OF THE BOARD OF DIRECTORS HAMPTON, NH, January 29, 2020: Unitil Corporation (NYSE:UTL) (www.unitil.com) today announced that its Board of Directors has elected Winfield S. Brown to the Board. The addition of a new director is part of the Board’s normal succession planning process in anticipation of the upcoming retirements of