STERLING INFRASTRUCTURE, INC.

of the Company’s Business Sterling Infrastructure, Inc. ( Sterling or the Company ) 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. In this report, unless the context otherwise indicates, Sterling, the Company, we, our or us means Sterling and its consolidated subsidiaries. In addition, references to Note or Notes refer to the Notes to the Consolidated Financial Statements, included in Item 8 of Part II of this annual report on Form 10-K, unless indicated otherwise.