Bowman is a professional services firm delivering integrated engineering, technical consulting and program management services to customers who own, develop, and maintain the built environment. We provide planning, engineering, program management, commissioning, environmental consulting, geospatial imaging, surveying, land procurement and other infrastructure management services to customers operating in a diverse set of end markets.
Over the approximately 5 years since our IPO, we have experienced a more than four-fold increase in gross contract revenue to $490 million for the year ended December 31, 2025 (we interchangeably refer to gross contract revenue as "revenue"). We have achieved this increase in revenue through both organic growth and acquisitions. In 2025, we ranked 72 nd on the ENR Top 500 Design Firms list, up from 144 th in 2021, the year of our initial public offering and 78 th in 2024. As of December 31, 2025, we have a workforce of over 2,300 employees that provides services for thousands of customer projects both big and small, as well as both short- and long-term. We operate from more than 135 locations throughout the United States and four offices in Mexico. As of December 31, 2025, we have approximately 10,000 active projects in our backlog.
We work as both a prime and sub-consultant for a broad base of public and private sector customers that generally operate in regulated environments. Our public sector assignments originate from customers that are transportation departments, utilities, government agencies (federal, state, and local), military branches, school systems, water authorities and other general public infrastructure operators. Our private sector customers include infrastructure owners and operators from multiple industries such as investor-owned utilities, oil & gas extractors and refiners, pipeline operators, participants in the renewable energy and decarbonization marketplace, data center developers and hyper-scalers, wastewater treatment facilities, developers of residential, commercial and retail real estate, mine operators and others. During each of the years ended December 31, 2025 and 2024, approximately 30% and 27%, respectively of our revenue was derived from public sector customer assignments.
Approximately 73% of our revenue for the year ended December 31, 2025 was derived from repeat customers, which we define as any customer from which revenue was earned in both the full years ended December 31, 2025 and 2024, excluding revenue derived from companies we acquired in 2025. Our customers are international, national, regional, and local in their focus. Our success in customer acquisition and retention is the result of our investment in long-term relationships, our commitment to innovation and advanced production systems, and the delivery of highly creative, technology-enabled and cost-effective solutions.