Featured deals in IL and ID; Thank you from The CEO Symposium 

Commentary & Insight

A sincere thank you to the CEOs who joined us in Dallas this week for The CEO Symposium. It was an exceptional 24 hours of meaningful networking and insight, as industry leaders shared their perspectives, experiences, and vision with peers from across the industry. 

This week, we report a total of six domestic transactions. Internationally, new deals were announced in the UK, Ireland, and Poland. 

Domestic Transactions

5/8/2026 
Stonewall Studios (Lafayette, LA), an architecture and design platform, added MNK Architects (El Paso, TX) to its network of design studios. MNK specializes in educational, healthcare, civic, commercial, and municipal projects. Link to details >

5/11/2026 
SAM (Austin, TX) (ENR #92), a geospatial firm that serves utilities, transportation, and infrastructure clients, acquired Donaldson, Garrett & Associates (Macon, GA), a land surveying firm serving commercial, utilities, and local government clients. Link to details >

5/12/2026 
Colliers Engineering & Design (Holmdel, NJ) (ENR #24) entered into a definitive agreement to partner with Frankfurt-Short-Bruza Associates (Oklahoma City, OK), a provider of MEP engineering, structural engineering, and architectural services. Link to details >

5/12/2026 
ENR’s #162 ranked environmental firm and one of the AE industry’s most prolific buyers, J.S. Held (Jericho, NY) acquired Clark Seif Clark (Los Angeles, CA), an environmental firm that provides industrial hygiene, environmental engineering, health and safety, and regulatory compliance services. Link to details >

Global Transactions

5/6/2025 
SOCOTEC (Saint-Quentin-en-Yvelines, France) expanded its engineering and asset inspection services with the acquisition of LSTC Group (Driffield, UK), a firm that serves the electrical transmission and distribution network sectors. Link to details >

5/6/2026 
Built environmental consulting firm Ridge and Partners (Woodstock, UK) acquired Hub Transport Planning (Birmingham, UK), a firm focused on transport assessment, strategy, and design. Link to details >

5/7/2026 
Multidisciplinary engineering firm ORS (Dublin, Ireland) acquired civil and structural engineering firm GDCL (Dublin, Ireland). Link to details >

5/12/2026 
PM and construction planning firm ADC (Warsaw, Poland) joined Drees & Sommer (Stuttgart, Germany), a firm that offers consultation and implementation services for the real estate, industrial, energy, and infrastructure sectors. Link to details >

5/13/2026 
Engineering services and nuclear firm AtkinsRéalis (Montreal, Canada) (ENR #16) entered a definitive agreement to acquire TOBIN (Galway, Ireland), a firm that offers engineering, PM, and environmental and planning services. Link to details >