Notice of Proposed Sale · 144

Sterling Infrastructure, Inc.

STRLNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Jun 25, 2026Accepted Jun 25, 2026, 10:11 AM EDTFiling CIK 874238Accession 0001959173-26-004872

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: STERLING INFRASTRUCTURE, INC.
Issuer CIK: 0000874238
SEC file number: 001-31993
Phone: 281-214-0777
Person for whose account securities are to be sold: Wolf Mark D.
Relationships to issuer: Officer
Street: 1800 HUGHES LANDING BLVD.
Street (continued): SUITE 250
City: THE WOODLANDS
State / country code: TX
Postal code: 77380

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Common	2,500	2,220,000.00	30,685,954	06/25/2026	NASDAQ	Fidelity Brokerage Services LLC

Broker / market maker — proposed row 1, entry 1

Name: Fidelity Brokerage Services LLC
Street: 900 Salem Street
City: Smithfield
State / country code: RI
Postal code: 02917

Acquisition of securities to be sold

Acquisition of securities to be sold · 2 reported rows
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Common	12/31/2024	Restricted Stock Vesting	Issuer	1,375	N	12/31/2024	Compensation
Common	02/25/2026	Restricted Stock Vesting	Issuer	1,125	N	02/25/2026	Compensation

Prior-sale reporting

Nothing to report for the preceding three months: Y

Notice signature

Notice date: 06/25/2026
Signed: /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark D. Wolf

Company context

Sterling 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 for manufacturing, data centers, 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.

Current securities

STRLNASDAQ · EQUITY · Current

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