Scott Barbour of Advanced Drainage (NYSE: WMS) reports 14,300-share gift

Rhea-AI Filing Summary

Advanced Drainage Systems director and officer Scott Barbour reported charitable-style transfers of company stock. On March 13, 2026, entities associated with him made two bona fide gifts of 7,150 shares of common stock each, for a total of 14,300 shares, at a reported price of $0.00 per share.

The gifts were made from the reporting person’s revocable trust and an irrevocable spousal access trust. After these transfers, the revocable trust held 53,141 shares and the irrevocable spousal access trust held 109,955 shares. Additional direct and indirect holdings, including GRATs, spousal trusts and a KSOP allocation, are also reported, indicating that Barbour retains a substantial overall position in Advanced Drainage Systems stock.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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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 for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

BARBOUR D. SCOTT

(Last) (First) (Middle)

C/O ADVANCED DRAINAGE SYSTEMS, INC.

4024 GREEN STRIPE LANE

(Street)

HILLIARD OH 43026

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/13/2026

4. If Amendment, Date of 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

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	03/13/2026		G		7,150	D	$0	53,141	I	Reporting Person's Revocable Trust(1)
Common Stock	03/13/2026		G		7,150	A	$0	109,955	I	Reporting Person's Irrevocable Trust(2)
Common Stock								42,867	D
Common Stock								511	I	2023 GRAT Remainder Trust(3)
Common Stock								11,867	I	Reporting Person's 2024 GRAT(4)
Common Stock								46,500	I	Reporting Person's 2025 GRAT(4)
Common Stock								6,495	I	Spouse's Revocable Trust(5)
Common Stock								69,005	I	Spouse's Irrevocable Trust(6)
Common Stock								17,065.5115	I	By KSOP(7)

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 Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. Shares held in revocable trust for the benefit of the reporting person.

2. 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.

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. Shares held in GRATs of which the reporting person is trustee.

5. Shares held in revocable trust for the benefit of the reporting person's spouse.

6. 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.

7. Represents current allocation under KSOP.

Remarks:

President & Chief Executive Officer

	/s/ D. Scott Barbour, by Scott A. Cottrill as attorney-in-fact	03/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did Scott Barbour report at Advanced Drainage Systems (WMS)?

Scott Barbour reported two bona fide gifts of Advanced Drainage Systems common stock. On March 13, 2026, trusts associated with him transferred 7,150 shares each, totaling 14,300 shares, as non-cash gifts with a reported price of $0.00 per share.

How many Advanced Drainage Systems (WMS) shares did Scott Barbour gift?

Entities associated with Scott Barbour gifted a total of 14,300 Advanced Drainage Systems shares. This came from two separate transactions of 7,150 shares each, both coded as bona fide gifts, meaning they were non-market, no-consideration transfers rather than open-market sales.

Were Scott Barbour’s WMS transactions open-market sales or gifts?

They were gifts, not open-market sales. Both transactions are coded “G” as bona fide gifts at $0.00 per share, indicating non-cash transfers typically for estate or charitable planning purposes, rather than discretionary selling based on a view of the stock price.

Which entities made the gifted share transfers related to Scott Barbour and WMS?

The reported gifts came from trusts associated with Scott Barbour. One transfer was from his revocable trust, and the other from an irrevocable spousal access trust that benefits him and his children, reflecting indirect ownership structures rather than direct personal holdings.

How many WMS shares do the key Barbour-related trusts hold after the gifts?

After the gifts, the revocable trust associated with Scott Barbour holds 53,141 Advanced Drainage Systems shares, while the irrevocable spousal access trust holds 109,955 shares. The Form 4 also lists other direct and indirect holdings, including GRATs, spousal trusts and a KSOP allocation.

Does Scott Barbour still hold Advanced Drainage Systems (WMS) stock after these gifts?

Yes. Following the reported gifts, Scott Barbour continues to have significant direct and indirect exposure to Advanced Drainage Systems stock. The filing lists direct holdings, multiple trusts, and a KSOP allocation, all of which together represent a substantial ongoing ownership position.