X0609 4 2026-10-08 0000105132 WD 40 CO WDFC 0002139508 GIORDANO NICHOLAS DANIEL false C/O: WD-40 COMPANY 9715 BUSINESSPARK AVENUE SAN DIEGO CA 92131 true VP, Corporate Controller & CAO false Common Stock 2026-10-08 4 A 0 257 A 597 D Represents a grant of restricted stock units (RSUs) under the WD-40 Company 2016 Stock Incentive Plan, as amended and restated effective December 12, 2023. Except as otherwise provided in the RSU award agreement, the RSUs vest annually over 3 years. As of the filing date, the amount reported includes: (i) 359 unvested RSUs (which include the grant of RSUs reported in this Form 4), and (ii) 21 shares of restricted Common Stock received upon settlement of performance share units or PSUs. Ann T. Nguyen, as attorney-in-fact for Nicholas D. Giordano 2026-10-13