Value creation redefined. At GISI, brand legacies are honored, employees are owners, and collaboration creates more collective value than any single company could achieve alone.
Build for generations. At GISI, legacies are honored, employees are owners, and collaboration creates more sustaining value than anyone could achieve alone. Who we are GISI unites successful companies in construction services, project management, and engineering consulting to build long-term value together. With access to greater opportunities, innovation, and capital, our partner companies collaborate across a thriving ecosystem that’s built to better serve our clients, strengthen our careers, and enrich our communities. The GISI difference — legacy, collaboration, and employee ownership Legacy GISI was established by veteran engineers and industry experts. Our merger partnerships are rooted in shared values and long-term alignment, while honoring the legacies that made them exceptional. Our History Our History Collaboration Drawing on a wealth of shared expertise and collaboration, the management of our companies are empowered to deliver broader services, explore new markets, and expand employee career opportunities — a pillar of the GISI model. Our Model Our Model Learn More Learn More A global scale — our numbers at a glance Business groups GISI is a dynamic family of companies where our partners can work together to serve clients more powerfully. Today we are represented in two business groups. STO Building Group One of the largest privately held construction service firms, providing services to a diversified group of clients in a variety of end-markets throughout North America, Ireland, United Kingdom, and the Netherlands. Explore STO Building Group Explore STO Building Group GISI Consulting Group One of the top 10 global providers of project management and engineering consulting, delivering services worldwide in infrastructure & mobility, earth & water, and government & society for private and public sector clients. Explore GISI Consulting Group Explore GISI Consulting Group The GISI footprint, projects built to endure Department of Water Resources,GISI - Global Infrastructure Solutions Inc.
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