Grinnell Mutual has introduced updates to its commercial agribusiness program in South Dakota, with changes scheduled to take effect on October 1, 2026 for both new and renewal business. The filing was submitted and approved on March 27, 2026.

The update includes a 6.6% overall rate increase, aligned with the insurer’s indicated need and supported by actuarial analysis. The program currently covers approximately $93,000 in written premium across two policyholders in the state, with an estimated premium impact of about $6,200.

These changes are driven by loss trends and experience from accident years 2020 through 2024, with loss costs trending significantly higher than premium trends, supporting the need for rate increases.

Overall, the filing reflects a standard rate adequacy move supported by rising loss trends, with incremental adjustments to rating mechanics and coverage structure rather than a broader product redesign.