Form 8-K

8-K — STERLING INFRASTRUCTURE, INC.

Accession: 0000874238-26-000110

Filed: 2026-10-05

Period: 2026-10-05

CIK: 0000874238

SIC: 1600 (HEAVY CONSTRUCTION OTHER THAN BUILDING CONST - CONTRACTORS)

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — strl-20261005.htm (Primary)

EX-99.1 (a20260805ex991pressrelease.htm)

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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): October 5, 2026

STERLING INFRASTRUCTURE, INC.

(Exact name of registrant as specified in its charter)

Delaware 001-31993 25-1655321

(State or other jurisdiction of incorporation

or organization) (Commission File Number) (I.R.S. Employer

Identification No.)

1800 Hughes Landing Blvd.

The Woodlands, Texas

77380

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (281) 214-0777

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

Common Stock, $0.01 par value per share STRL The NASDAQ Stock Market LLC

(Title of Class) (Trading Symbol) (Name of each exchange on which registered)

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:

☐ 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))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR § 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 7.01 Regulation FD Disclosure.

On October 5, 2026, the Company issued a press release announcing the appointment of Katherine Hargis as Senior Vice President, General Counsel, Chief Compliance Officer, and Corporate Secretary, a copy of which is furnished as Exhibit 99.1 hereto and incorporated into this Item 7.01 by reference. The information provided in this Item 7.01 shall not be deemed to be “filed” for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, unless the Company specifically states that the information is to be considered “filed” under the Exchange Act, nor shall it be incorporated by reference in any filing made by the Company pursuant to the Exchange Act or the Securities Act, other than to the extent that such filing incorporates by reference any or all of such information by express reference thereto.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit Number Description

99.1

Press release, dated October 5, 2026

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.

STERLING INFRASTRUCTURE, INC.

Date: October 5, 2026 By: /s/ Nicholas Grindstaff

Nicholas Grindstaff

Chief Financial Officer

EX-99.1

Filename: a20260805ex991pressrelease.htm · Sequence: 2

Document

NEWS RELEASE

For Immediate Release:

October 5, 2026

Sterling Appoints Katherine Hargis as Senior Vice President, General Counsel, Chief Compliance Officer, and Corporate Secretary

THE WOODLANDS, TX – October 5, 2026 – Sterling Infrastructure, Inc. (NasdaqGS: STRL) ("Sterling" or "the Company") today announced the appointment of Katherine Hargis as Senior Vice President, General Counsel, Chief Compliance Officer, and Corporate Secretary, effective October 5, 2026. Hargis succeeds Mark D. Wolf, who previously served as Sterling’s General Counsel, Chief Compliance Officer, and Corporate Secretary since August 2020.

Hargis joins Sterling from Key Energy Services, where she most recently served as Senior Vice President, Chief Administrative Officer, General Counsel, and Corporate Secretary. In that role, she was a key advisor to the Board of Directors and executive leadership team, overseeing legal affairs, corporate governance, and enterprise compliance and ethics, while also providing executive leadership across a range of corporate functions and enterprise-wide strategic initiatives, including human capital, cybersecurity, and risk management. Previously, Hargis held several legal leadership roles at U.S. Concrete, including Vice President, General Counsel and Corporate Secretary. She earned a Juris Doctor from Tulane Law School and a Bachelor of Science in Administration of Justice from Arizona State University.

"We are pleased to welcome Katherine to Sterling," said Joe Cutillo, Sterling’s Chief Executive Officer. "Her extensive experience, proven leadership capabilities and expertise in governance, compliance, and M&A will strengthen our leadership team as we execute our growth strategy and continue to create long-term value for our shareholders."

About Sterling

Sterling Infrastructure, Inc., operates through a variety of subsidiaries within three segments specializing in E-Infrastructure, Transportation and Building Solutions in the United States, primarily across the Southern, Northeastern, Mid-Atlantic and Rocky Mountain regions and the Pacific Islands. E-Infrastructure Solutions provides advanced, large-scale site development services and mission-critical electrical services for data centers, semiconductor fabrication, manufacturing, distribution centers, warehousing, power generation and more. Transportation Solutions includes infrastructure and rehabilitation projects for highways, roads, bridges, airports, ports, rail and storm drainage systems. Building Solutions includes residential and commercial concrete foundations for single-family and multi-family homes, parking structures, elevated slabs, other concrete work, plumbing services, and surveys for new single-family residential builds. From strategy to operations, we are committed to sustainability by operating responsibly to safeguard and improve society’s quality of life. Caring for our people and our communities, our customers and our investors – that is The Sterling Way.

Joe Cutillo, CEO, "We build and service the infrastructure that enables our economy to run,

our people to move and our country to grow."

Company Contact:

Sterling Infrastructure, Inc.

Noelle Dilts, VP of Investor Relations and Corporate Strategy

281-214-0795

Noelle.Dilts@strlco.com

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