Unitil director Mark H. Collin receives 2,272 shares

Unitil Corporation director Mark H. Collin received a grant of 2,272 common shares on October 1, 2026, under the Unitil Corporation Third Amended and Restated 2003 Stock Plan.

Rhea-AI Filing Summary

Unitil Corporation director Mark H. Collin received a grant of 2,272 common shares on October 1, 2026, under the Unitil Corporation Third Amended and Restated 2003 Stock Plan. The shares were transferred into his name as the stock portion of his annual retainer fee as a director. His reported direct holdings after the grant were 61,109 shares.

Insider Trade Summary

Grant/Award: 2,272 shares

Grant/Award 1 txn

Insider COLLIN MARK H

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common stock, no par value F1	2,272	$0.00	$0.00

Holdings After Transaction: Common stock, no par value — 61,109.16 shares (Direct)

Footnotes (1)

1. F1. Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan and transferred into my name in connection with the stock portion of my annual retainer fee as a Director of the Company.

Key Figures

Shares granted: 2,272 shares Direct holdings after grant: 61,109 shares

2 metrics

Shares granted 2,272 shares October 1, 2026

Direct holdings after grant 61,109 shares Following the October 1, 2026 grant

Key Terms

Third Amended and Restated 2003 Stock Plan, annual retainer fee, no par value

3 terms

Third Amended and Restated 2003 Stock Plan financial

"pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan"

annual retainer fee financial

"the stock portion of my annual retainer fee"

no par value financial

"Common stock, no par value"

Shares described as "no par value" are equity securities issued without a fixed face amount written into the corporate charter; their legal capital is not tied to a specific per-share number and the company may record proceeds differently than for par-value shares. This matters to investors because it affects how a company records equity, sets minimum legal capital, and handles bookkeeping for issuances, dividends and splits—similar to buying slices of a pie where the slice has no printed sticker price and market forces determine worth.

FAQ

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How many shares did UTL director Mark H. Collin receive?

Mark H. Collin, a director of Unitil Corporation, received 2,272 common shares on October 1, 2026. The shares were granted under the Unitil Corporation Third Amended and Restated 2003 Stock Plan and transferred into his name as the stock portion of his annual retainer fee. His reported direct holdings afterward were 61,109 shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/02/2026 - 02:54 PM Accepted by SEC EDGAR 10/02/2026 - 02:53 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

COLLIN MARK H

(Last) (First) (Middle)

6 LIBERTY LANE WEST

(Street)

HAMPTON NEW HAMPSHIRE 03842

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
UNITIL CORP [ UTL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common stock, no par value	10/01/2026		A(1)		2,272	A	$0	61,109.16	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan and transferred into my name in connection with the stock portion of my annual retainer fee as a Director of the Company.

	/s/ Kumiko A. Shortill, attorney-in-fact for Mark H. Collin	10/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)