Advanced Drainage (NYSE: WMS) officer gets stock, options in Form 4

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

ADVANCED DRAINAGE SYSTEMS, INC. officer Tim A. Makowski reported routine equity compensation and updated holdings. He received a grant of 847 shares of Common Stock at no cost, bringing his directly held Common Stock to 6,722 shares. He also received an option to purchase 1,886 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 continued employment. In addition, he reports indirect ownership of 17,556.8712 shares of Common Stock through a KSOP allocation.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider MAKOWSKI TIM A

Role See Remarks

Type	Security	Shares	Price	Value
Grant/Award	Option to Purchase Common Stock	1,886	$0.00	--
Grant/Award	Common Stock	847	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Option to Purchase Common Stock — 1,886 shares (Direct, null); Common Stock — 6,722 shares (Direct, null); Common Stock — 17,556.871 shares (Indirect, By KSOP)

Footnotes (1)

Represents current allocation under KSOP. 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: 847 shares Direct common shares after grant: 6,722 shares Stock options granted: 1,886 options +3 more

6 metrics

Common stock grant 847 shares Compensation-related grant of Common Stock at $0.00 per share

Direct common shares after grant 6,722 shares Directly held Common Stock following the 847-share award

Stock options granted 1,886 options Option to purchase Common Stock granted on May 26, 2026

Option exercise price $138.09 per share Exercise price for 1,886 stock options

Option expiration May 27, 2036 Expiration date of the 1,886-share option grant

KSOP indirect holdings 17,556.8712 shares Indirect Common Stock ownership via KSOP allocation

Key Terms

KSOP, Grant, award, or other acquisition, Option to Purchase Common Stock, indirect, +1 more

5 terms

KSOP financial

"Represents current allocation under KSOP."

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

Option to Purchase Common Stock financial

"security_title: Option to Purchase Common Stock"

indirect financial

"ownership_type: indirect"

vest financial

"The options vest in three equal annual installments"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

Form 4 Insider Transactions: What Each Field Means →

05/28/2026 - 04:05 PM

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^*

MAKOWSKI TIM A

(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)
	See Remarks

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/26/2026		A		847	A	$0	6,722	D
Common Stock								17,556.8712	I	By KSOP⁽¹⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Option to Purchase Common Stock	$138.09	05/26/2026		A		1,886		⁽²⁾	05/27/2036	Common Stock	1,886	$0	1,886	D

Explanation of Responses:

1. Represents current allocation under KSOP.

2. 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.

Remarks:

Vice President, Controller and Chief Accounting Officer

	/s/ Tim A. Makowski, 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did Tim A. Makowski report in this WMS Form 4 filing?

Tim A. Makowski reported routine equity compensation awards and updated share holdings. He received 847 shares of Common Stock and an option for 1,886 shares, along with reporting 17,556.8712 shares held indirectly through a KSOP allocation.

How many WMS common shares did Tim Makowski receive directly in this grant?

He received a grant of 847 shares of Advanced Drainage Systems common stock at no cost. After this award, his directly held common stock position totals 6,722 shares, reflecting compensation-related share issuance rather than an open-market purchase.

What are the key terms of the stock options granted to Tim Makowski at WMS?

He was granted options over 1,886 shares of Advanced Drainage Systems common stock with a $138.09 exercise price. The options expire on May 27, 2036 and vest in three equal annual installments starting May 26, 2027, subject to continuous employment.

When do Tim Makowski’s new WMS stock options begin vesting?

The options begin vesting on May 26, 2027 in three equal annual installments. Vesting requires that Tim Makowski remain continuously employed by Advanced Drainage Systems through each applicable vesting date to earn the corresponding portion of the grant.

How many WMS shares does Tim Makowski hold indirectly through the KSOP?

He reports indirect ownership of 17,556.8712 shares of Advanced Drainage Systems common stock through a KSOP. This represents his current allocation under the KSOP plan and is separate from his directly held shares and option awards reported in this filing.

Does this WMS Form 4 show any open-market buying or selling by Tim Makowski?

This Form 4 does not show open-market buying or selling by Tim Makowski. It reports grants of 847 shares of Common Stock and 1,886 options as compensation, plus an updated KSOP allocation classified as indirect ownership.