Plymouth Rock Assurance Co. has sold an independent agency in western Massachusetts that it purchased more than 25 years ago. The buyer, MountainOne Insurance Agency, is owned by regional bank MountainOne Bank.
Plymouth Rock’s sale of Amherst-based Encharter Insurance Agency was effective October 1, 2026.
Terms were not disclosed.
Encharter has been an integral part of the Amherst community since 1879, providing residential and commercial insurance. It was formerly known as Blair, Cutting & Smith. As part of the acquisition, 22 Encharter insurance professionals join the MountainOne team as well as the agency’s Amherst office and satellite location in Lexington.
North Adams-based MountainOne Insurance Agency provides personal and commercial property and casualty insurance, surety, employee benefits, life and Medicare insurance. The acquisition of the Amherst agency creates MountainOne’s first insurance office in Hampshire County. The company continues its expansion throughout the Pioneer Valley, expanding its local offices in Greenfield, Longmeadow, West Springfield and Wilbraham, as well as communities throughout the Berkshires
Since 1999, under the leadership of Plymouth Rock Assurance, Encharter maintained its independent agency model and relationships with multiple insurance carriers.
Encharter will gradually transition to the MountainOne Insurance Agency name and brand.
Based in Boston, Plymouth Rock offers auto, home, condo, renters and umbrella insurance in the six northeastern states of Connecticut, Massachusetts, New Hampshire, New Jersey, New York and Pennsylvania.
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Mergers and Acquisitions
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