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UNITIL CORP

For the period ended Sep 30, 2025. Filed Nov 3, 2025.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2025 · Filed Nov 3, 2025

UTL$56.13-0.4%Stored close · as of Nov 9, 2026

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Item 6. Exhibits

(a) Exhibits

Exhibit No.Description of ExhibitReference*
4.1 (1)(2)Note Purchase Agreement dated July 8, 2025 by and among Bangor Natural Gas Company and the several purchasers named therein.Exhibit 4.1 to Form 8-K for July 8, 2025 (SEC File No. 1-8858)
4.25.70% Senior Note, Series 2025A, due July 8, 2030, issued by Bangor Natural Gas Company to CoBank, ACB.Exhibit 4.2 to Form 8-K for July 8, 2025 (SEC File No. 1-8858)
4.36.31% Senior Note, Series 2025B, due July 8, 2035, issued by Bangor Natural Gas Company to United of Omaha Life Insurance Company.Exhibit 4.3 to Form 8-K for July 8, 2025 (SEC File No. 1-8858)
10.1Underwriting Agreement, August 14, 2025, by and among Unitil Corporation and Wells Fargo Securities, LLC, Scotia Capital (USA) Inc. and Janney Montgomery Scott LLC.Exhibit 1.1 to Form 8-K for August 14, 2025 (SEC File No. 1-8858)
31.1Certification of Chief Executive Officer Pursuant to Rule 13a-14 of the Exchange Act, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002Filed herewith
31.2Certification of Chief Financial Officer Pursuant to Rule 13a-14 of the Exchange Act, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002Filed herewith
31.3Certification of Chief Accounting Officer Pursuant to Rule 13a-14 of the Exchange Act, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002Filed herewith
32.1Certifications of Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002Filed herewith
99.1Unitil Corporation Press Release Dated November 3, 2025 Announcing Earnings for the Quarter Ended September 30, 2025.Furnished herewith
101.INSInline XBRL Instance Document. The instance document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL document.Filed herewith
101.SCHInline XBRL Taxonomy Extension Schema with Embedded Linkbase Documents.Filed herewith
104Cover Page Interactive Data File – The cover page interactive data file does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document.Filed herewith
  • The exhibits referred to in this column by specific designations and dates have heretofore been filed with or furnished to the Securities and Exchange Commission under such designations and are hereby incorporated by reference.

(1) Certain information has been excluded from this exhibit pursuant to Item 601(b)(2)(ii) of Regulation S-K.

(2) 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, or the cover page of its omitted schedules and exhibits, includes a brief description of the subject matter of all of its omitted schedules and exhibits. Unitil Corporation hereby undertakes to furnish supplementally copies of any of the omitted schedules and exhibits upon request by the Securities and Exchange Commission or its staff.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.