ADDED
The number of shares of the registrant s common stock outsta nding was 17,983,994 as of Feb ruary 6, 2026.
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 92 9A.
(Northern Utilities) NH - 1979 Natural Gas Distribution Utility Bangor Natural Gas Company (Bangor) ME - 1998 Natural Gas Distribution Utility Maine Natural Gas Corporation (Maine Natural) ME - 1998 Natural Gas Distribution Utility Granite State Gas Transmission, Inc.
(Unitil Resources) NH - 1993 Non-regulated Energy Services Unitil Water Corp.
Together, Unitil s five distribution utilities serve approximately 110,100 electric customers and 105,000 natural gas customers.
Customers Served as of December 31, 2025 Residential Commercial Industrial (C I) Total Electric: Unitil Energy 67,879 11,532 79,411 Fitchburg 26,422 4,231 30,653 Total Electric 94,301 15,763 110,064 Natural Gas: Northern Utilities 56,094 17,161 73,255 Fitchburg 14,706 1,735 16,441 Bangor 7,162 1,751 8,913 Maine Natural 4,803 1,650 6,453 Total Natural Gas 82,765 22,297 105,062 Total Customers Served 177,066 38,060 215,126 Unitil had an investment in Net Utility Plant of $1.8 billion at December 31, 2025.
The Company s total operating revenue was $536.0 million in 2025.
Unitil has four other wholly-owned non-utility subsidiaries: Unitil Service, Unitil Realty, Unitil Resources and Unitil Water.
Unitil Realty owns and manages the Company s corporate office in Hampton, New Hampshire and land in Kingston, New Hampshire on which Unitil Energy s solar facility is located, which became operational in May 2025.
Revenue from Unitil s electric utility operations was $236.4 million in 2025, which represents about 44% of Unitil s total operating revenue.
REMOVED
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 84 9A.
Exhibits and Financial Statement Schedules 86 SIGNATURES Signatures 95 In this Annual Report on Form 10-K, the Company , Unitil , we , us , our and similar terms refer to Unitil Corporation and its subsidiaries, unless the context requires otherwise.
(Northern Utilities) NH - 1979 Natural Gas Distribution Utility Granite State Gas Transmission, Inc.
Unitil is the parent company of three wholly-owned distribution utilities: i) Unitil Energy, which provides electric service in the southeastern seacoast and state capital regions of New Hampshire, including the capital city of Concord, ii) Fitchburg, which provides both electric and natural gas service in the greater Fitchburg area of north central Massachusetts, and iii) Northern Utilities, which provides natural gas service in southeastern New Hampshire and portions of southern and central Maine, including the city of Portland, which is the largest city in northern New England.
Together, Unitil s three distribution utilities serve approximately 109,400 electric customers and 89,100 natural gas customers.
Customers Served as of December 31, 2024 Residential Commercial Industrial (C I) Total Electric: Unitil Energy 67,428 11,464 78,892 Fitchburg 26,386 4,166 30,552 Total Electric 93,814 15,630 109,444 Natural Gas: Northern Utilities 55,570 17,124 72,694 Fitchburg 14,685 1,749 16,434 Total Natural Gas 70,255 18,873 89,128 Total Customers Served 164,069 34,503 198,572 Unitil had an investment in Net Utility Plant of $1,539.6 million at December 31, 2024.
The Company s total operating revenue was $494.8 million in 2024.
A fifth utility subsidiary, Unitil Power, formerly functioned as the full requirements wholesale power supply provider for Unitil Energy, but ceased being the wholesale supplier of Unitil Energy with the implementation of industry restructuring and divested its long-term power supply contracts.
Unitil has three other wholly-owned non-utility subsidiaries: Unitil Service, Unitil Realty, and Unitil Resources.
Unitil Realty owns and manages the Company s corporate office in Hampton, New Hampshire and 3 land for future use in Kingston, New Hampshire.