Insider Transaction Report for Tim A. Makowski

This filing details a Form 4 filed by Tim A. Makowski, Vice President, Controller and Chief Accounting Officer of ADVANCED DRAINAGE SYSTEMS, INC. On May 26, 2026, Makowski acquired 847 shares of Common Stock and 1886 options to purchase Common Stock, both transactions with a price of $0.0. Following these transactions, Makowski directly owns 6,722 shares of Common Stock and holds 1,886 options. Additionally, he has indirect ownership of 17,556.8712 shares of Common Stock through the KSOP, with options vesting in three equal annual installments starting May 26, 2027, contingent upon continued employment. The options have an exercise price of $138.09 and expire on May 27, 2036.