UNITIL CORP — AGM Information 2026

Apr 29, 2026

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, 2026

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 Number)	(IRS Employer Identification No.)
6 Liberty Lane West
Hampton , New Hampshire		03842-1720
(Address of Principal Executive Offices)		(Zip Code)

Registrant’s Telephone Number, Including Area Code: (603) 772-0775

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, no par value	UTL	The New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01 Regulation FD Disclosure.

At 11:30 a.m. on April 29, 2026, Unitil Corporation (the “Company”) will hold its Annual Meeting of Shareholders at its offices in Hampton, New Hampshire. Following the formal business of the meeting, the Company’s Chairman and Chief Executive Officer, Thomas P. Meissner, Jr., plans to make a presentation to the Company’s shareholders. That presentation is attached as Exhibit 99.1 and will be available in the investor relations section of the Company’s website (www.unitil.com/investors) subsequent to the meeting.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Number	Exhibit
99.1	Unitil Corporation’s presentation to shareholders at its Annual Meeting of Shareholders on April 29, 2026.
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

UNITIL CORPORATION — /s/ Daniel J. Hurstak
Daniel J. Hurstak Senior Vice President, Chief Financial Officer and Treasurer