WMS EVP receives new stock and option awards

ADVANCED DRAINAGE SYSTEMS, INC.

Rhea-AI Filing Summary

ADVANCED DRAINAGE SYSTEMS, INC. Executive Vice President Brian W. King received new equity compensation in the form of common stock and stock options. He was granted 950 shares of common stock at $0.00 per share, increasing his direct holdings to 21,686 shares, which include 89 shares acquired under the company’s Employee Stock Purchase Plan. He also received an option to purchase 2,115 shares of common stock at an exercise price of $138.09 per share, expiring on May 27, 2036. These options vest in three equal annual installments beginning on May 26, 2027, subject to his continued employment. In addition, he indirectly holds 1,778.1777 shares of common stock through a KSOP allocation.

Insider Trade Summary

Grant/Award: 3,065 shares

Grant/Award 3 txns

Insider KING BRIAN W.

Role Executive Vice President

Type	Security	Shares	Price	Value
Grant/Award	Option to Purchase Common Stock	2,115	$0.00	$0.00
Grant/Award	Common Stock	950	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Option to Purchase Common Stock — 2,115 contracts (Direct); Common Stock — 21,686 shares (Direct); Common Stock — 1,778.1777 shares (Indirect, By KSOP)

Footnotes (3)

1. F1. Includes 89 shares of common stock acquired under the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan, exempt under Rule 16b-3(c).
2. F2. Represents current allocation under KSOP.
3. F3. The options vest in three equal annual installments beginning on May 26, 2027, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date.

Key Figures

Common stock grant: 950 shares at $0.00 Direct holdings after grant: 21,686 shares Indirect KSOP holdings: 1,778.1777 shares +5 more

8 metrics

Common stock grant 950 shares at $0.00 Award of common stock on May 26, 2026

Direct holdings after grant 21,686 shares Common stock held directly after the transaction

Indirect KSOP holdings 1,778.1777 shares Common stock held indirectly through KSOP

Stock option grant size 2,115 options Options to purchase common stock granted May 26, 2026

Option exercise price $138.09 per share Conversion or exercise price for the new options

Option expiration date May 27, 2036 Expiration of options to purchase common stock

Option vesting start May 26, 2027 First of three equal annual vesting dates

ESPP shares included 89 shares Shares acquired under Employee Stock Purchase Plan

Key Terms

Employee Stock Purchase Plan, Rule 16b-3(c), KSOP, vest in three equal annual installments, +1 more

5 terms

Employee Stock Purchase Plan financial

"Includes 89 shares of common stock acquired under the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan, exempt under Rule 16b-3(c)."

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Rule 16b-3(c) regulatory

"Includes 89 shares of common stock acquired under the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan, exempt under Rule 16b-3(c)."

An SEC rule that lets corporate insiders avoid automatic "short‑swing" profit recovery when they buy or sell their company’s stock under a pre‑approved, written plan that meets specific conditions. For investors, it matters because it clarifies when insider trades are treated as routine, reducing legal uncertainty and helping distinguish trades made for ordinary compensation or pre‑planned reasons from those that might signal opportunistic or timely insider advantage.

KSOP financial

"Represents current allocation under KSOP."

vest in three equal annual installments financial

"The options vest in three equal annual installments beginning on May 26, 2027, provided that the Reporting Person remains continuously employed by the Issuer."

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did WMS executive Brian W. King report?

Brian W. King reported receiving equity compensation awards, not open-market trades. He was granted 950 shares of common stock and options on 2,115 shares, reflecting routine executive compensation rather than a discretionary purchase or sale in the market.

How many WMS common shares did Brian W. King receive in this Form 4?

He received 950 shares of WMS common stock as a grant at $0.00 per share. This award increased his direct holdings to 21,686 shares, including 89 shares acquired through the company’s Employee Stock Purchase Plan under Rule 16b-3(c).

What are the terms of Brian W. King’s new WMS stock options?

He received options on 2,115 WMS shares with a $138.09 exercise price and a May 27, 2036 expiration. The options vest in three equal annual installments starting May 26, 2027, contingent on his continued employment with Advanced Drainage Systems.

How many WMS shares does Brian W. King own after these transactions?

After the reported awards, he holds 21,686 WMS shares directly and 1,778.1777 shares indirectly through a KSOP allocation. The indirect KSOP position is in addition to his directly owned shares reported in the Form 4 filing.

Is Brian W. King’s Form 4 for WMS a stock buy or sell?

The Form 4 reflects stock and option grants, not a market buy or sell. Transactions are coded as acquisitions (A) for compensation awards, meaning he received shares and options from Advanced Drainage Systems as part of his executive compensation package.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/28/2026 - 04:05 PM EDT Learn about SEC filing dates

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^*

KING BRIAN W.

(Last) (First) (Middle)

C/O ADVANCED DRAINAGE SYSTEMS, INC.

4024 GREEN STRIPE LANE

(Street)

HILLIARD OHIO 43026

(City) (State) (Zip)

UNITED STATES

(Country)

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)
	Executive Vice President

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/26/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	05/26/2026		A		950	A	$0	21,686(1)	D
Common Stock								1,778.1777	I	By KSOP(2)

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
Option to Purchase Common Stock	$138.09	05/26/2026		A		2,115		(3)	05/27/2036	Common Stock	2,115	$0	2,115	D

Explanation of Responses:

1. Includes 89 shares of common stock acquired under the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan, exempt under Rule 16b-3(c).

2. Represents current allocation under KSOP.

3. The options vest in three equal annual installments beginning on May 26, 2027, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date.

	/s/ Brian W. King, by Scott A. Cottrill as attorney-in-fact	05/28/2026
	** 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.
* Form 4: SEC 1474 (03-26)