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WMS (WMS) director Barbour granted 29,327 shares; 2,064 withheld for taxes

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

ADVANCED DRAINAGE SYSTEMS, INC. director and officer D. Scott Barbour received a grant of 29,327 shares of common stock on May 20, 2026 as performance-based units earned under the company’s 2017 Omnibus Incentive Plan. The award includes 409 shares issued as dividend equivalents settled in common stock. To cover tax obligations related to vesting, a total of 2,064 shares were withheld, consisting of 1,130 shares at $136.83 per share on May 20, 2026 and 934 shares at $131.59 per share on May 19, 2026. After these transactions, Barbour holds 40,803 shares of common stock directly, along with additional indirect holdings through various trusts and plans, including 53,141 shares in a revocable trust for his benefit and 109,955 shares in an irrevocable trust.

Positive

  • None.

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Insider BARBOUR D. SCOTT
Role See Remarks
Type Security Shares Price Value
Tax Withholding Common Stock 1,130 $136.83 $155K
Grant/Award Common Stock 29,327 $0.00 --
Tax Withholding Common Stock 934 $131.59 $123K
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 40,803 shares (Direct, null); Common Stock — 53,141 shares (Indirect, Reporting Person's Revocable Trust)
Footnotes (1)
  1. Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer. Reflects grant of performance-based units, originally granted pursuant to the Issuer's 2017 Omnibus Incentive Plan, earned after the Issuer determined that certain performance goals for the performance period ended March 31, 2026 had been met. Total includes dividend equivalents in the amount of 409 shares, which dividend equivalents are settled in common stock. Shares held in revocable trust for the benefit of the reporting person. 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. 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. Shares held in GRATs of which the reporting person is trustee. Shares held in revocable trust for the benefit of the reporting person's spouse. 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. Represents current allocation under KSOP.
Equity grant 29,327 shares Performance-based units earned; includes 409 dividend equivalents
Tax withholding total 2,064 shares Shares delivered to satisfy tax obligations on vesting
Tax withholding price 1 $136.83/share 1,130 shares withheld on May 20, 2026
Tax withholding price 2 $131.59/share 934 shares withheld on May 19, 2026
Direct holdings post-transaction 40,803 shares Direct common stock owned after reported transactions
Revocable trust holdings 53,141 shares Reporting person’s revocable trust
Irrevocable trust holdings 109,955 shares Reporting person’s irrevocable trust
KSOP allocation 17,087.4254 shares Current allocation under KSOP
performance-based units financial
"Reflects grant of performance-based units, originally granted pursuant to the Issuer's 2017 Omnibus Incentive Plan, earned after the Issuer determined that certain performance goals..."
2017 Omnibus Incentive Plan financial
"Originally granted pursuant to the Issuer's 2017 Omnibus Incentive Plan, earned after the Issuer determined that certain performance goals..."
dividend equivalents financial
"Total includes dividend equivalents in the amount of 409 shares, which dividend equivalents are settled in common stock."
Payments tied to employee or contractor equity awards that mirror the cash dividends paid on the company’s stock; they give the holder the same economic benefit as owning the shares without transferring actual shares—often paid in cash or additional award units when the award becomes payable. Investors care because these payments affect a company’s compensation costs, cash flow and potential share dilution, and they signal how management is being rewarded and aligned with shareholders.
GRAT financial
"Shares held in GRATs of which the reporting person is trustee."
KSOP financial
"Represents current allocation under KSOP."
tax obligations financial
"Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer."
SEC Form 4
FORM 4UNITED 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*
BARBOUR D. SCOTT

(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)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
See Remarks
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/19/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock05/19/2026F934(1)D$131.5941,933D
Common Stock05/20/2026F1,130(1)D$136.8340,803D
Common Stock05/20/2026A29,327(2)A$070,130D
Common Stock53,141IReporting Person's Revocable Trust(3)
Common Stock109,955IReporting Person's Irrevocable Trust(4)
Common Stock511I2023 GRAT Remainder Trust(5)
Common Stock11,867IReporting Person's 2024 GRAT(6)
Common Stock46,500IReporting Person's 2025 GRAT(6)
Common Stock6,495ISpouse's Revocable Trust(7)
Common Stock69,005ISpouse's Irrevocable Trust(8)
Common Stock17,087.4254IBy KSOP(9)
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.
2. Reflects grant of performance-based units, originally granted pursuant to the Issuer's 2017 Omnibus Incentive Plan, earned after the Issuer determined that certain performance goals for the performance period ended March 31, 2026 had been met. Total includes dividend equivalents in the amount of 409 shares, which dividend equivalents are settled in common stock.
3. Shares held in revocable trust for the benefit of the reporting person.
4. 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.
5. 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.
6. Shares held in GRATs of which the reporting person is trustee.
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
/s/ D. Scott Barbour, by Scott A. Cottrill as attorney-in-fact05/21/2026
** Signature of Reporting PersonDate
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)

FAQ

What did WMS director D. Scott Barbour receive in this Form 4 filing?

Barbour received 29,327 shares of common stock as a grant on May 20, 2026. The grant reflects performance-based units earned under the 2017 Omnibus Incentive Plan and includes 409 dividend-equivalent shares settled in common stock as part of his equity compensation.

How many WMS shares were withheld for D. Scott Barbour’s taxes?

A total of 2,064 shares of ADVANCED DRAINAGE SYSTEMS common stock were withheld to satisfy Barbour’s tax obligations. This includes 1,130 shares at $136.83 on May 20, 2026 and 934 shares at $131.59 on May 19, 2026.

How many WMS shares does D. Scott Barbour hold directly after these transactions?

Following the equity grant and related tax-withholding entries, Barbour holds 40,803 shares of ADVANCED DRAINAGE SYSTEMS common stock directly. This figure reflects his post-transaction direct ownership shown in the Form 4, excluding various indirect trust and plan holdings.

What indirect holdings does D. Scott Barbour report in WMS stock?

Barbour reports multiple indirect holdings of ADVANCED DRAINAGE SYSTEMS stock, including 53,141 shares in his revocable trust, 109,955 shares in his irrevocable trust, and additional shares in GRATs, spousal trusts, and a KSOP allocation, each with separate trustee and beneficiary arrangements.

Were the WMS Form 4 dispositions open-market sales by D. Scott Barbour?

No. The dispositions shown in the Form 4 are tax-withholding entries labeled with code F. Shares were delivered to cover tax obligations associated with vesting of restricted or performance-based stock, rather than discretionary open-market sales by Barbour.

What plan governs the performance-based units granted to WMS’s D. Scott Barbour?

The performance-based units underlying the 29,327-share grant were earned under the company’s 2017 Omnibus Incentive Plan. The filing states they were awarded after performance goals for the period ended March 31, 2026 were determined to have been met.