Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * BARBOUR D. SCOTT 2. Issuer Name and Ticker or Trading Symbol ADVANCED DRAINAGE SYSTEMS, INC. [WMS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) C/O ADVANCED DRAINAGE SYSTEMS, INC., 4640 TRUEMAN BOULEVARD 3. Date of Earliest Transaction (Month/Day/Year) 03/04/2026 (Street) HILLIARD, OH 43026 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/04/2026 G 511 D $ 0 0 (1) I Reporting Person's 2023 GRAT(2) Common Stock 03/04/2026 G 511 A $ 0 511 I 2023 GRAT Remainder Trust(3) Common Stock 42,867(4) D Common Stock 11,867 I Reporting Person's 2024 GRAT(2) Common Stock 46,500 I Reporting Person's 2025 GRAT(2) Common Stock 60,291(1)(4) I Reporting Person's Revocable Trust(5) Common Stock 98,805 I Reporting Person's Irrevocable Trust(6) Common Stock 6,495 I Spouse's Revocable Trust(7) Common Stock 69,005 I Spouse's Irrevocable Trust(8) Common Stock 17,065.5115 I By KSOP(9)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
BARBOUR D. SCOTT C/O ADVANCED DRAINAGE SYSTEMS, INC. 4640 TRUEMAN BOULEVARD HILLIARD, OH 43026	X		See Remarks

Signatures

/s/ D. Scott Barbour, by Scott A. Cottrill as attorney-in-fact		03/06/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	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.
(2)	Shares held in GRATs of which the reporting person is trustee.
(3)	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.
(4)	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.
(5)	Shares held in revocable trust for the benefit of the reporting person.
(6)	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.
(7)	Shares held in revocable trust for the benefit of the reporting person's spouse.
(8)	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.
(9)	Represents current allocation under KSOP.
Remarks: President & Chief Executive Officer

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