Form 8-K

8-K — ADVANCED DRAINAGE SYSTEMS, INC.

Accession: 0001604028-26-000030

Filed: 2026-07-16

Period: 2026-07-16

CIK: 0001604028

SIC: 3086 (PLASTICS FOAM PRODUCTS)

Item: Submission of Matters to a Vote of Security Holders

Item: Financial Statements and Exhibits

Documents

8-K — wms-20260716.htm (Primary)

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8-K

8-K (Primary)

Filename: wms-20260716.htm · Sequence: 1

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 16, 2026

ADVANCED DRAINAGE SYSTEMS, INC.

(Exact name of Registrant as Specified in Its Charter)

Delaware 001-36557 51-0105665

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(IRS Employer

Identification No.)

4024 Green Stripe Lane

43026

Hilliard,

Ohio

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, Including Area Code: (800) 733-7473

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instructions A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange on which registered

Common Stock, $0.01 par value per share WMS New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.07 Submission of Matters to a Vote of Security Holders.

The 2026 Annual Meeting of Stockholders (the “Annual Meeting”) of the Company was held via webcast on July 16, 2026, at 10:00 a.m. Eastern Time. Stockholders were able to participate in the Annual Meeting and vote via live webcast. Stockholders considered three proposals at the meeting, each of which is described in more detail in the Company’s Definitive Proxy Statement on Schedule 14A, which was filed with the Securities and Exchange Commission (“SEC”) on June 3, 2026. The final voting results are reported below.

Proposal One: Election of nine directors, including D. Scott Barbour, Anesa T. Chaibi, Michael B. Coleman, Robert M. Eversole, Alexander R. Fischer, Tanya D. Fratto, Kelly S. Gast, Manuel Perez de la Mesa, and Anil Seetharam, to serve for a one-year term until the 2027 annual meeting of stockholders, or until his or her successor has been elected and qualified.

The Company’s stockholders elected each of the nine nominees for director, and the voting results are set forth below:

Name For Against Abstentions Broker Non-Votes

D. Scott Barbour 66,915,010 559,087 137,610 1,838,060

Anesa T. Chaibi 65,015,665 2,465,788 130,254 1,838,060

Michael B. Coleman 67,011,857 477,669 122,181 1,838,060

Robert M. Eversole 62,571,357 4,817,812 222,538 1,838,060

Alexander R. Fischer 60,633,237 6,371,121 607,349 1,838,060

Tanya D. Fratto 63,069,295 4,420,516 121,896 1,838,060

Kelly S. Gast 67,296,891 192,263 122,553 1,838,060

Manuel Perez de la Mesa 65,610,486 1,858,122 143,099 1,838,060

Anil Seetharam 65,610,601 1,851,169 149,937 1,838,060

Proposal Two: Ratification of the appointment of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for fiscal year 2027.

The Company’s stockholders ratified the selection of Deloitte & Touche LLP, and the voting results are set forth below:

For Against Abstentions Broker Non-Votes

62,686,364 6,631,324 132,079 —

Proposal Three: Advisory vote to approve the compensation of the Company’s executive officers as disclosed in the Company’s Proxy Statement.

The Company’s stockholders gave advisory approval of the compensation of the Company’s executive officers as disclosed in the Proxy Statement, and the voting results are set forth below:

For Against Abstentions Broker Non-Votes

61,978,434 5,183,274 449,999 1,838,060

Item 9.01 Financial Statements and Exhibits.

(d)Exhibits

The following exhibits are being furnished as part of this report:

104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

ADVANCED DRAINAGE SYSTEMS, INC.

Date: July 16, 2026 By: /s/ Scott A. Cottrill

Name: Scott A. Cottrill

Title: EVP, CFO & Secretary

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