D. SCOTT BARBOUR - 04 Mar 2026 Form 4 Insider Report for ADVANCED DRAINAGE SYSTEMS, INC. (WMS)

Role
President & Chief Executive Officer, Director
Signature
/s/ D. Scott Barbour, by Scott A. Cottrill as attorney-in-fact
Issuer symbol
WMS
Transactions as of
04 Mar 2026
Net transactions value
$0
Form type
4
Filing time
06 Mar 2026, 17:46:40 UTC
Previous filing
10 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
BARBOUR D. SCOTT President & Chief Executive Officer, Director C/O ADVANCED DRAINAGE SYSTEMS, INC., 4640 TRUEMAN BOULEVARD, HILLIARD /s/ D. Scott Barbour, by Scott A. Cottrill as attorney-in-fact 06 Mar 2026 0001716232

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WMS Common Stock Gift -511 -100% $0.000000* 0 04 Mar 2026 Reporting Person's 2023 GRAT F1, F2
transaction WMS Common Stock Gift +511 $0.000000* 511 04 Mar 2026 2023 GRAT Remainder Trust F3
holding WMS Common Stock 42,867 04 Mar 2026 Direct F4
holding WMS Common Stock 11,867 04 Mar 2026 Reporting Person's 2024 GRAT F2
holding WMS Common Stock 46,500 04 Mar 2026 Reporting Person's 2025 GRAT F2
holding WMS Common Stock 60,291 04 Mar 2026 Reporting Person's Revocable Trust F1, F4, F5
holding WMS Common Stock 98,805 04 Mar 2026 Reporting Person's Irrevocable Trust F6
holding WMS Common Stock 6,495 04 Mar 2026 Spouse's Revocable Trust F7
holding WMS Common Stock 69,005 04 Mar 2026 Spouse's Irrevocable Trust F8
holding WMS Common Stock 17,066 04 Mar 2026 By KSOP F9
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 On December 17, 2025, the reporting person transferred 24,600 shares of common stock of Advanced Drainage Systems, Inc. from his 2023 GRAT to his revocable trust for the benefit of the reporting person, which transfer is exempt under Rule 16a-13.
F2 Shares held in GRATs of which the reporting person is trustee.
F3 Shares held in irrevocable remainder trust, of which the reporting person's spouse is trustee. The beneficiaries of the irrevocable trust are the reporting persons's nieces and nephew.
F4 Reflects correction of previously reported gift of 1,800 from direct holdings on November 25, 2025 that was actually gifted from the reporting person's revocable trust.
F5 Shares held in revocable trust for the benefit of the reporting person.
F6 Shares held in irrevocable spousal access trust established by the reporting person, of which the reporting person's spouse is a co-trustee. The beneficiaries of the irrevocable trust are the reporting person and his children.
F7 Shares held in revocable trust for the benefit of the reporting person's spouse.
F8 Shares held in irrevocable spousal access trust established by the reporting person's spouse, of which the reporting person is a co-trustee. The beneficiaries of the irerrevocable trust include the reporting person's spouse and his children.
F9 Represents current allocation under KSOP.

Remarks:

President & Chief Executive Officer