Spinnaker filed for changes to its California Businessowners program under the Harborway Insurance Program administered by Simply Business. The filing requests an overall indicated rate change of 9.8%, though the projected overall rate impact is just 0.4%, affecting 491 policyholders and about $500,000 in written premium.

The filing states that Spinnaker is revising ISO Building and Business Personal Property base loss costs to “remove the relativity of wildfire loss costs between all territories in California.” According to the memorandum, the change is intended to ensure the rating plan does not trigger California wildfire territory regulations.

The Harborway Insurance Program was introduced in California in July 2024 and is operated by Simply Business under delegated authority from Spinnaker.

The filing shows the program remains relatively small and early in development. California experience data reflects 333 earned exposures through Q1 2026, with 10 reported claims and about $160,000 in paid losses and DCCE.