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ADVANCED DRAINAGE SYSTEMS, INC./WMS 4640 TRUEMAN BLVD. HILLIARD, OH 43026 Your Vote Counts! ADVANCED DRAINAGE SYSTEMS, INC./WMS 2022 Annual Meeting Vote by July 20, 2022 11:59 PM ET. For shares held in a Plan, vote by July 15, 2022 11:59 PM ET. D87771-P74842 You invested in ADVANCED DRAINAGE SYSTEMS, INC./WMS and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on July 21, 2022. Get informed before you vote View the Notice and Proxy Statement and 10-K Wrap online OR you can receive a free paper or email copy of the material(s) by requesting prior to July 7, 2022. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Virtually at: Vote Virtually at the Meeting* July 21, 2022 10:00 A.M. Eastern Time www.virtualshareholdermeeting.com/WMS2022 *Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com
This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters.
Voting Items
1.Election of Officers
1a. Anesa T. Chaibi For
1b. Robert M. Eversole For
1c. Alexander R. Fischer For
1d. Kelly S. Gast For
1e. M.A. (Mark) Haney For
1f. Ross M. Jones For
1g. Manuel Perez de la Mesa For
1h. Anil Seetharam For
2. Ratification of the appointment of Deloitte & Touche LLP as the Company’s Independent Registerd Public Accounting Firm for fiscal year 2023. For
3. Approval, in a non-binding advisory vote, of the compensation for named executive officers For
4. REcommendation, in a non-binding advisory vote, for the frequency of future advisory votes on executive compensation. 1 year
5. Approval of the Employee Stock Purchase Plan
Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”.

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