UTL

SEC source: 0001193125-26-411912 · ownership.xml · derivative · entry 2

Alonzo Anne L. · CIK 0001894560 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,289

Underlying: Common stock · 2,272 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F1 · derivative.exercise_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F1 · derivative.expiration_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

SEC source: 0001193125-26-411956 · ownership.xml · nonDerivative · entry 1

Foster Suzanne · CIK 0001766653 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,406

F1 · kind: 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.

SEC source: 0001193125-26-411926 · ownership.xml · derivative · entry 2

Awad Neveen F · CIK 0001952995 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,707

Underlying: Common stock · 2,272 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F2 · derivative.exercise_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F2 · derivative.expiration_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

SEC source: 0001193125-26-411937 · ownership.xml · derivative · entry 2

Brown Winfield S · CIK 0001802079 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,598

Underlying: Common stock · 2,272 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F1 · derivative.exercise_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F1 · derivative.expiration_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

SEC source: 0001193125-26-411943 · ownership.xml · nonDerivative · entry 1

COLLIN MARK H · CIK 0001240995 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,109.16

F1 · kind: 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.

SEC source: 0001193125-26-411981 · ownership.xml · derivative · entry 2

Lewis-Raymond Jane · CIK 0001763779 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,707

Underlying: Common stock · 2,272 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F2 · derivative.exercise_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F2 · derivative.expiration_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

SEC source: 0001193125-26-411971 · ownership.xml · nonDerivative · entry 1

Kountze Katherine · CIK 0001891939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,896

F1 · kind: 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.

SEC source: 0001193125-26-411992 · ownership.xml · nonDerivative · entry 1

Vogel Justine · CIK 0001766849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,406

F1 · kind: 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.

SEC source: 0001190118-26-000002 · ownership.xml · nonDerivative · entry 1

WHITELEY DAVID A · CIK 0001190118 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,305

F1 · kind: 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.

SEC source: 0001193125-26-029594 · ownership.xml · derivative · entry 3

Simpson Carleton B · CIK 0002091692 · SVP, Gen. Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,275

Underlying: Common stock · 795 shares

Expires not disclosed

F3 · derivative.exercise_price: 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.

F3 · price: 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.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

SEC source: 0001193125-26-029594 · ownership.xml · nonDerivative · entry 2

Simpson Carleton B · CIK 0002091692 · SVP, Gen. Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,100

F2 · price: 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.

SEC source: 0001193125-26-029594 · ownership.xml · nonDerivative · entry 1

Simpson Carleton B · CIK 0002091692 · SVP, Gen. Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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.

SEC source: 0001193125-26-029565 · ownership.xml · derivative · entry 4

Hurstak Daniel J · CIK 0001807713 · SVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,330

Underlying: Common stock · 1,215 shares

Expires not disclosed

F5 · derivative.exercise_price: 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.

F5 · price: 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.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001193125-26-029565 · ownership.xml · nonDerivative · entry 3

Hurstak Daniel J · CIK 0001807713 · SVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,089.37

F3 · price: 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 · balance_after: Includes114.625 shares of common stock acquired on February 28, 2025, 121.718 shares of common stock acquired on May 30, 2025, 140.309 shares of common stock acquired on August 28, 2025 and 135.571 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.

SEC source: 0001193125-26-029565 · ownership.xml · nonDerivative · entry 2

Hurstak Daniel J · CIK 0001807713 · SVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · price: 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.

SEC source: 0001193125-26-029565 · ownership.xml · nonDerivative · entry 1

Hurstak Daniel J · CIK 0001807713 · SVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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.

SEC source: 0001193125-26-029548 · ownership.xml · derivative · entry 4

Diggins Todd R · CIK 0001976526 · CAO & Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,520

Underlying: Common stock · 540 shares

Expires not disclosed

F5 · derivative.exercise_price: 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.

F5 · price: 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.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001193125-26-029548 · ownership.xml · nonDerivative · entry 3

Diggins Todd R · CIK 0001976526 · CAO & Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,262.59

F3 · price: 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 · balance_after: 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.

SEC source: 0001193125-26-029548 · ownership.xml · nonDerivative · entry 2

Diggins Todd R · CIK 0001976526 · CAO & Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · price: 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.

SEC source: 0001193125-26-029548 · ownership.xml · nonDerivative · entry 1

Diggins Todd R · CIK 0001976526 · CAO & Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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.

SEC source: 0001193125-26-029501 · ownership.xml · derivative · entry 4

LeBlanc Christopher J · CIK 0001768487 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,520

Underlying: Common stock · 540 shares

Expires not disclosed

F5 · derivative.exercise_price: 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.

F5 · price: 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.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001193125-26-029501 · ownership.xml · nonDerivative · entry 3

LeBlanc Christopher J · CIK 0001768487 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,372.16

F3 · price: 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 · balance_after: Includes 44.268 shares of common stock acquired on February 28, 2025, 46.552 shares of common stock acquired on May 30, 2025, 53.116 shares of common stock acquired on August 28, 2025 and 50.729 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.

SEC source: 0001193125-26-029501 · ownership.xml · nonDerivative · entry 2

LeBlanc Christopher J · CIK 0001768487 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · price: 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.

SEC source: 0001193125-26-029501 · ownership.xml · nonDerivative · entry 1

LeBlanc Christopher J · CIK 0001768487 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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.

SEC source: 0001193125-26-029475 · ownership.xml · derivative · entry 5

Eisfeller Justin · CIK 0001909978 · CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,520

Underlying: Common stock · 540 shares

Expires not disclosed

F5 · derivative.exercise_price: 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.

F5 · price: 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.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001193125-26-029475 · ownership.xml · nonDerivative · entry 3

Eisfeller Justin · CIK 0001909978 · CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,394

F3 · price: 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.

SEC source: 0001193125-26-029475 · ownership.xml · nonDerivative · entry 2

Eisfeller Justin · CIK 0001909978 · CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · price: 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.

SEC source: 0001193125-26-029475 · ownership.xml · nonDerivative · entry 1

Eisfeller Justin · CIK 0001909978 · CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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.

SEC source: 0001193125-26-029437 · ownership.xml · derivative · entry 4

Hevert Robert B · CIK 0001819134 · Pres. & Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,120

Underlying: Common stock · 1,870 shares

Expires not disclosed

F5 · derivative.exercise_price: 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.

F5 · price: 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.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001193125-26-029437 · ownership.xml · nonDerivative · entry 3

Hevert Robert B · CIK 0001819134 · Pres. & Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,465.35

F3 · price: Shares were granted pursuant to the Unitil Corporation Third Amended and Restated 2003 Stock Plan. Shares were granted at the conclusion of 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 · balance_after: Includes 211.965 shares of common stock acquired on February 28, 2025, 224.671 shares of common stock acquired on May 30, 2025, 258.497 shares of common stock acquired on August 28, 2025 and 249.233 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.

SEC source: 0001193125-26-029437 · ownership.xml · nonDerivative · entry 2

Hevert Robert B · CIK 0001819134 · Pres. & Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · price: 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.

SEC source: 0001193125-26-029437 · ownership.xml · nonDerivative · entry 1

Hevert Robert B · CIK 0001819134 · Pres. & Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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.

SEC source: 0001193125-26-029406 · ownership.xml · derivative · entry 5

MEISSNER THOMAS P JR · CIK 0001241002 · Director · Chairmain & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,140

Underlying: Common stock · 4,045 shares

Expires not disclosed

F5 · derivative.exercise_price: 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.

F5 · price: 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.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001193125-26-029406 · ownership.xml · nonDerivative · entry 3

MEISSNER THOMAS P JR · CIK 0001241002 · Director · Chairmain & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 145,995

F3 · price: 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.

SEC source: 0001193125-26-029406 · ownership.xml · nonDerivative · entry 2

MEISSNER THOMAS P JR · CIK 0001241002 · Director · Chairmain & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · price: 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.

SEC source: 0001193125-26-029406 · ownership.xml · nonDerivative · entry 1

MEISSNER THOMAS P JR · CIK 0001241002 · Director · Chairmain & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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.

SEC source: 0001193125-25-229636 · ownership.xml · nonDerivative · entry 1

WHITELEY DAVID A · CIK 0001190118 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,033

F1 · kind: 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.

SEC source: 0001193125-25-229630 · ownership.xml · nonDerivative · entry 1

Vogel Justine · CIK 0001766849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,134

F1 · kind: 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.

SEC source: 0001193125-25-229598 · ownership.xml · derivative · entry 2

Lewis-Raymond Jane · CIK 0001763779 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,435

Underlying: Common stock · 2,435 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F2 · derivative.exercise_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F2 · derivative.expiration_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

SEC source: 0001193125-25-229535 · ownership.xml · nonDerivative · entry 1

Kountze Katherine · CIK 0001891939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,624

F1 · kind: 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.

SEC source: 0001193125-25-229522 · ownership.xml · derivative · entry 2

GREEN MICHAEL B · CIK 0001253399 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,357

Underlying: Common stock · 2,435 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F1 · derivative.exercise_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F1 · derivative.expiration_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

SEC source: 0001193125-25-229508 · ownership.xml · nonDerivative · entry 1

Foster Suzanne · CIK 0001766653 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,134

F1 · kind: 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.

SEC source: 0001193125-25-229499 · ownership.xml · nonDerivative · entry 1

COLLIN MARK H · CIK 0001240995 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,837.16

F1 · kind: 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.

SEC source: 0001193125-25-229493 · ownership.xml · nonDerivative · entry 1

Brown Winfield S · CIK 0001802079 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,723

F1 · kind: 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.

SEC source: 0001193125-25-229488 · ownership.xml · derivative · entry 2

Awad Neveen F · CIK 0001952995 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,435

Underlying: Common stock · 2,435 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F2 · derivative.exercise_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F2 · derivative.expiration_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

SEC source: 0001193125-25-229474 · ownership.xml · derivative · entry 2

Alonzo Anne L. · CIK 0001894560 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,017

Underlying: Common stock · 2,435 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F1 · derivative.exercise_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

F1 · derivative.expiration_date: Each restricted stock unit is equivalent in value to one share of Unitil Corporation's common stock, no par value ("Common Stock"), and represents the right to receive a combination of cash and Common Stock after separation from service on Unitil Corporation's Board of Directors. Each restricted stock unit is fully vested upon grant and is payable 70% in Common Stock and 30% in cash, based upon the closing price of Common Stock on the day prior to settlement.

SEC source: 0000950170-25-010438 · ownership.xml · derivative · entry 4

WHITNEY SANDRA L · CIK 0001248881 · Corporate Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 335

Underlying: Common stock · 110 shares

Expires not disclosed

F5 · derivative.exercise_price: 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 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.

F5 · price: 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 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.

F5 · derivative.exercise_date: 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 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.

F5 · derivative.expiration_date: 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 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.

SEC source: 0000950170-25-010438 · ownership.xml · nonDerivative · entry 2

WHITNEY SANDRA L · CIK 0001248881 · Corporate Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,170.27

F2 · price: 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 · balance_after: Includes 30.575 shares of common stock acquired on February 29, 2024, 30.301 shares of common stock acquired on May 31, 2024, 26.147 shares of common stock acquired on August 29, 2024 and 26.106 shares of common stock acquired on November 29, 2024, in each case resulting from the reinvestment of dividends pursuant to Unitil Corporation's Dividend reinvestment and Stock Purchase Plan.

SEC source: 0000950170-25-010438 · ownership.xml · nonDerivative · entry 1

WHITNEY SANDRA L · CIK 0001248881 · Corporate Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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.

SEC source: 0000950170-25-010434 · ownership.xml · derivative · entry 3

LeBlanc Christopher J · CIK 0001768487 · Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,465

Underlying: Common stock · 480 shares

Expires not disclosed

F4 · derivative.exercise_price: 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 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.

F4 · price: 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 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.

F4 · derivative.exercise_date: 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 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.

F4 · derivative.expiration_date: 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 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.