Advanced Drainage Systems CFO Scott Cottrill's Stock Transactions and Performance Award Vesting

This Form 4 filing reports stock transactions by Scott A. Cottrill, EVP, CFO and Secretary of Advanced Drainage Systems, Inc. (WMS). On May 19-20, 2026, Cottrill disposed of 277 shares at $131.59 and 339 shares at $136.83 to cover tax obligations related to vesting restricted stock. On May 20, he acquired 10,075 shares at $0 per share through the vesting of performance-based units originally granted under the company's 2017 Omnibus Incentive Plan, which were earned after performance goals for the period ending March 31, 2026 were met. The award included 130 dividend equivalent shares settled in common stock. Following these transactions, Cottrill directly owns 108,612 shares and indirectly holds 17,469 shares through the KSOP plan. The filing demonstrates executive compensation through equity awards and standard tax withholding procedures for vested shares.