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.
Texas Data Center — Construction Services | STO Mission Critical
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.
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.
Employee ownership
GISI was founded on the belief that we could do much more through the power of shared employee ownership. At every level, our people are empowered to think and act like owners — driven by accountability, craft, and pride in their work.
A global scale — our numbers at a glance
GISI’s numbers today are the result of purposeful strategy and thoughtful stewardship.
*Past performance is not indicative of future results. Please see GISI Legal Notice for additional disclosures.
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.
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.
The GISI footprint, projects built to endure
Airports, dams, hospitals, universities, data centers. These projects must last for generations. GISI’s partner companies work alongside clients to create infrastructure solutions that endure, adapt, and improve the lives of the people who depend on them.
What our business leaders are saying
GISI’s model and focus on employee ownership provides staff the opportunity to think and act long-term as they serve clients in delivering essential projects.
Pursuing a greater kind of value.
From projects that serve communities to connections that grow careers, GISI’s unique business model is designed to naturally create sustaining value — for our clients, our employees, our families, and our world at large.