Form 4 Filing for Compass Minerals International Inc.

This filing details a series of transactions by Benjamin S. Nichols, Chief Commercial Officer of Compass Minerals International Inc. On October 15, 2026, Nichols acquired 6,946 shares of common stock (transaction code M) and disposed of 1,977 shares of common stock (transaction code F), the latter to cover tax withholding obligations related to vested restricted stock units. The filing also reports the disposal of 856 restricted stock units and 6,090 restricted stock units, both vesting in installments with the final vesting date in 2026 and 2027 respectively. Following these transactions, Nichols holds 22,934 shares directly. Additionally, he holds 249 shares indirectly through a 401(k) plan. The reporting owner is Nichols Benjamin S. with reporting owner CIK 0002015089. The issuer is COMPASS MINERALS INTERNATIONAL INC with trading symbol CMP and issuer CIK 0001227654. The signature date is October 19, 2026.