What is the 10-share Unitil grant related to the 2023–2025 performance period?

The 10-share grant was issued after the 2023–2025 performance period based on meeting performance thresholds. These shares were valued at the market price on the grant date, and the remaining balance of that earlier contingent grant for the period was terminated.

Unitil CAO Todd Diggins reports stock grants

Q: What is the 540-share contingent grant reported by Todd Diggins at Unitil (UTL)?

The 540-share contingent grant represents a potential future award under Unitil’s stock plan. Any such shares would be granted after a three-year performance period ending December 31, 2028, and would depend on achieving specified performance thresholds tied to defined goals.

Unitil Corporation’s CAO & Controller, Todd R. Diggins, reported multiple equity awards dated January 27, 2026 under the company’s Third Amended and Restated 2003 Stock Plan.

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Rhea-AI Filing Summary

Unitil Corporation’s CAO & Controller, Todd R. Diggins, reported multiple equity awards dated January 27, 2026 under the company’s Third Amended and Restated 2003 Stock Plan.

He acquired 1,080 time-vesting shares, 1,080 performance-based shares, and 10 shares granted after the 2023–2025 performance period, plus a 540-share contingent stock grant tied to a three-year performance period ending December 31, 2028.

Insider Trade Summary

Grant/Award: 2,710 shares

Grant/Award 4 txns

Insider Diggins Todd R

Role CAO & Controller

Type	Security	Shares	Price	Value
Grant/Award	Contingent grant of common stock	540	$0.00	$0.00
Grant/Award	Common stock, no par value	1,080	$0.00	$0.00
Grant/Award	Common stock, no par value	1,080	$0.00	$0.00
Grant/Award	Common stock, no par value	10	$50.00	$500.00

Holdings After Transaction: Contingent grant of common stock — 1,520 contracts (Direct); Common stock, no par value — 8,262.59 shares (Direct)

Footnotes (5)

F1. Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Shares generally will vest 25% per year over four years from date of grant. Shares will be valued at current market price on date of vesting.
F2. Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Shares generally will vest after three-year performance period based on the attainment of certain performance thresholds of certain performance goals. Shares will be valued at current market price on date of vesting.
F3. Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Shares were granted at the conclusion of the 2023-2025 performance period based on the attainment of certain performance thresholds of certain performance goals. Shares were valued at current market price on date of grant. The balance of the contingent grant for such performance period terminated.
F4. Includes 14.368 shares of common stock acquired on February 28, 2025, 49.604 shares of common stock acquired on May 30, 2025, 57.072 shares of common stock acquired on August 25, 2025 and 55.026 shares of common stock acquired on November 28, 2025, in each case resulting from the reinvestment of dividends pursuant to Unitil Corporation's Dividend reinvestment and Stock Purchase Plan.
F5. Shares may be granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Any such shares would be granted after a three-year performance period ending on December 31, 2028, based on the attainment of certain performance thresholds of certain performance goals. Any such shares would be valued at current market price on date of grant.

FAQ

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What did Todd R. Diggins report in his latest Form 4 for UTL?

Todd R. Diggins reported several equity awards from Unitil’s stock plan. These include time-vesting shares, performance-based shares linked to multi-year goals, and a contingent grant that depends on performance through December 31, 2028, all reflecting stock-based compensation rather than open-market purchases.

How many Unitil (UTL) shares did Todd Diggins receive that vest over time?

He received 1,080 shares of Unitil common stock that generally vest 25% per year over four years. These shares were granted under the company’s Third Amended and Restated 2003 Stock Plan and are valued at the market price when each portion vests.

What performance-based Unitil (UTL) shares did Todd Diggins report?

He reported 1,080 performance-based shares that generally vest after a three-year performance period. Vesting depends on achieving specified performance thresholds tied to certain goals, with the shares valued at the market price on the vesting date, according to the plan terms.

How many derivative securities does Todd Diggins hold after this Unitil (UTL) filing?

Following the reported transactions, Todd Diggins beneficially owns 1,520 derivative securities related to contingent grants of Unitil common stock. These instruments are tied to the company’s stock plan and may convert into shares depending on future performance conditions.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 01/29/2026 - 04:46 PM

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^*

Diggins Todd R

(Last)

(First)

(Middle)

6 LIBERTY LANE WEST

(Street)

HAMPTON

03842

(City)

(State)

(Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
01/27/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common stock, no par value	01/27/2026		A		1,080	A	$0⁽¹⁾	0	D
Common stock, no par value	01/27/2026		A		1,080	A	$0⁽²⁾	0	D
Common stock, no par value	01/27/2026		A		10	A	$50⁽³⁾	8,262.59⁽⁴⁾	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Contingent grant of common stock	⁽⁵⁾	01/27/2026		A		540		⁽⁵⁾	⁽⁵⁾	Common stock	540	⁽⁵⁾	1,520	D

Explanation of Responses:

1. Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Shares generally will vest 25% per year over four years from date of grant. Shares will be valued at current market price on date of vesting.

2. Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Shares generally will vest after three-year performance period based on the attainment of certain performance thresholds of certain performance goals. Shares will be valued at current market price on date of vesting.

3. Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Shares were granted at the conclusion of the 2023-2025 performance period based on the attainment of certain performance thresholds of certain performance goals. Shares were valued at current market price on date of grant. The balance of the contingent grant for such performance period terminated.

4. Includes 14.368 shares of common stock acquired on February 28, 2025, 49.604 shares of common stock acquired on May 30, 2025, 57.072 shares of common stock acquired on August 25, 2025 and 55.026 shares of common stock acquired on November 28, 2025, in each case resulting from the reinvestment of dividends pursuant to Unitil Corporation's Dividend reinvestment and Stock Purchase Plan.

5. Shares may be granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Any such shares would be granted after a three-year performance period ending on December 31, 2028, based on the attainment of certain performance thresholds of certain performance goals. Any such shares would be valued at current market price on date of grant.

	/s/ Thomas P. Meissner, Jr., attorney-in-fact for Todd R. Diggins	01/29/2026
	** 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.

Source: View Original Filing on SEC EDGAR