WMS insider sales at $148.2969 and $150; holdings updated

Rhea-AI Filing Summary

Advanced Drainage Systems (WMS) executive Thomas J. Waun, Sr. reported open‑market sales of common stock. On 11/11/2025, he sold 1,272.3795 shares at $148.2969 per share, and on 11/12/2025 he sold 1,000 shares at $150 per share.

After these transactions, he reported 14,970 shares held directly and 796.9667 shares held indirectly through the company KSOP. A footnote indicates the direct total includes 125 shares acquired under the Employee Stock Purchase Plan and that the KSOP amount represents his current allocation.

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

WAUN THOMAS J. SR.

(Last) (First) (Middle)

C/O ADVANCED DRAINAGE SYSTEMS, INC.

4640 TRUEMAN BOULEVARD

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, International

3. Date of Earliest Transaction (Month/Day/Year)
11/11/2025

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	11/11/2025		S		1,272.3795	D	$148.2969	796.9667	I	By KSOP(1)
Common Stock	11/12/2025		S		1,000	D	$150	14,970(2)	D

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. Represents current allocation under KSOP.

2. Includes 125 shares of common stock acquired under the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan, exempt under Rule 16b-3(c).

	/s/ Thomas J. Waun, Sr., by Scott A. Cottrill as attorney-in-fact	11/13/2025
	** 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 WMS report?

EVP, International Thomas J. Waun, Sr. reported sales of common stock on 11/11/2025 and 11/12/2025.

How many WMS shares were sold and at what prices?

He sold 1,272.3795 shares at $148.2969 on 11/11/2025 and 1,000 shares at $150 on 11/12/2025.

What are Thomas J. Waun, Sr.’s remaining WMS holdings?

He reported 14,970 shares held directly and 796.9667 shares held indirectly via KSOP.

What does the footnote disclose about the holdings?

The direct total includes 125 shares acquired under the Employee Stock Purchase Plan; the KSOP amount reflects his current allocation.

What is the insider’s role at Advanced Drainage Systems (WMS)?

He is an Officer serving as EVP, International.