Green Mountain Insurance, part of Auto-Owners, has filed updates to its Massachusetts Businessowners (BOP) program that would increase rates by an overall 1.5%, affecting approximately 5,205 policyholders and generating about $354,000 in additional written premium. The filing is effective September 1, 2026, for new business and November 1, 2026, for renewals.

The filing updates increased liability limit factors to align with ISO, revises base loss costs across property and liability coverages, and adjusts market segment factors based on the company’s loss experience and competitive positioning. Green Mountain said the changes are supported by five years of loss experience, with retail and wholesale businesses posting among the highest loss ratios.

The insurer is also introducing a commercial multi-policy discount for its Garagekeepers endorsement, matching the discount available in its Commercial Auto Garagekeepers program.