X0609 4 2026-10-01 0000755001 UNITIL CORP UTL 0001190118 WHITELEY DAVID A false 6 LIBERTY LANE WEST HAMPTON NH 03842 true false false false false Common stock, no par value 2026-10-01 4 A false 2272 0 A 13305 D Restricted stock units Common stock 0 9248 D 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. 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. /s/ Kumiko A. Shortill, attorney-in-fact for David A. Whiteley 2026-10-02