State Automobile Mutual Insurance Co. said it has agreed to acquire Rockhill Insurance Group of Kansas City, Mo. Financial terms were not released.

Rockhill Insurance writes approximately $135 million in specialty property-casualty direct written premium through company subsidiaries, Rockhill Insurance Co.; Plaza Insurance Co.; American Compensation Insurance Co. and Bloomington Compensation Insurance Co.

Key business segments include commercial property; general liability for residential construction; commercial umbrella and surety; a monocline workers' compensation company named RTW; and a third party administrator providing workers' comp claim and loss services named Absentia.

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