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Advanced Drainage (NYSE: WMS) EVP gets 4,491-share performance award

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

Rhea-AI Filing Summary

ADVANCED DRAINAGE SYSTEMS, INC. Executive Vice President Brian W. King received a grant of 4,491 shares of common stock, earned from performance-based units under the company’s 2017 Omnibus Incentive Plan after performance goals for the period ended March 31, 2026 were met. The total includes 62 shares credited as dividend equivalents and is compensation-related rather than an open-market purchase.

To cover tax obligations tied to vesting of restricted stock, 116 shares were withheld at $131.59 per share and 101 shares were withheld at $136.83 per share. After these transactions, King directly holds 16,475 common shares and indirectly holds 1,778.1777 shares through a KSOP allocation.

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Insider KING BRIAN W.
Role Executive Vice President
Type Security Shares Price Value
Tax Withholding Common Stock 101 $136.83 $14K
Grant/Award Common Stock 4,491 $0.00 --
Tax Withholding Common Stock 116 $131.59 $15K
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 16,475 shares (Direct, null); Common Stock — 1,778.178 shares (Indirect, By KSOP)
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. Includes 89 shares of common stock acquired under the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan, exempt under Rule 16b-3(c). 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 62 shares, which dividend equivalents are settled in common stock. Represents current allocation under KSOP.
Share grant 4,491 shares Performance-based units earned for period ended March 31, 2026
Dividend equivalents 62 shares Included in total grant, settled in common stock
Tax withholding batch 1 116 shares at $131.59 Shares withheld to satisfy tax obligations
Tax withholding batch 2 101 shares at $136.83 Shares withheld to satisfy tax obligations
Total tax-withheld shares 217 shares Two F-code tax-withholding dispositions
Direct holdings after transactions 16,475 shares Common stock held directly by Brian W. King
Indirect KSOP holdings 1,778.1777 shares Current allocation under KSOP plan
restricted common stock financial
"vesting of shares of restricted common stock of the Issuer"
Restricted common stock is company shares that carry limits on selling or transferring for a set period or until certain conditions are met, like time-based vesting or regulatory clearance. Think of them as shares in a locked box that gradually open; they can become freely tradable later but initially reduce the number of shares available on the market. Investors watch restricted stock because its eventual release can change a company’s share supply, affect stock price, and influence control and dilution.
Employee Stock Purchase Plan financial
"acquired under the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan"
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
"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.
performance-based units financial
"Reflects grant of performance-based units, originally granted pursuant to the Issuer's 2017 Omnibus Incentive Plan"
dividend equivalents financial
"Total includes dividend equivalents in the amount of 62 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.
KSOP financial
"Represents current allocation under KSOP"
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*
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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Executive Vice President
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 Stock05/19/2026F116(1)D$131.5916,576(2)D
Common Stock05/20/2026F101(1)D$136.8316,475D
Common Stock05/20/2026A4,491(3)A$020,966D
Common Stock1,778.1777IBy KSOP(4)
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. Includes 89 shares of common stock acquired under the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan, exempt under Rule 16b-3(c).
3. 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 62 shares, which dividend equivalents are settled in common stock.
4. Represents current allocation under KSOP.
/s/ Brian W. King, 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 Executive Vice President Brian W. King report in this Form 4?

Brian W. King reported a grant of 4,491 shares of Advanced Drainage common stock. The award was earned from performance-based units after goals for the period ended March 31, 2026 were met and includes 62 dividend-equivalent shares settled in stock.

Were Brian W. King’s WMS transactions open-market buys or sells?

The filing shows a compensation grant and tax-related withholdings, not open-market trades. Shares were awarded at no cost and 217 shares were withheld by the issuer at specified prices solely to satisfy tax obligations on vested restricted stock.

How many Advanced Drainage (WMS) shares does Brian W. King hold after these transactions?

After the reported transactions, Brian W. King directly holds 16,475 shares of Advanced Drainage common stock. He also has an indirect holding of 1,778.1777 shares through a KSOP allocation, as disclosed in the filing’s ownership detail.

What is the size and nature of the WMS share award granted to Brian W. King?

The award totals 4,491 common shares and stems from performance-based units under the 2017 Omnibus Incentive Plan. It was earned after the company determined performance goals for the period ended March 31, 2026 were achieved, and includes 62 dividend-equivalent shares.

Why were some WMS shares withheld from Brian W. King in this Form 4?

The company withheld 116 shares at $131.59 and 101 shares at $136.83 to satisfy King’s tax obligations. These F-code transactions are tax-withholding dispositions, meaning the issuer retained shares instead of cash to cover income taxes on vesting.

What does the KSOP reference mean in Brian W. King’s WMS holdings?

The filing notes an indirect holding of 1,778.1777 shares as a current allocation under a KSOP. This indicates shares are held for King through a qualified stock ownership-type plan, rather than directly in his personal brokerage account.