Thornton Tomasetti Acquires Simon & Associates, Inc.

Terracon Acquires TAM Consultants, Inc.

December 7, 2020

Engineering Services

Terracon has acquired TAM Consultants, Inc., a 15-person facilities engineering and design firm based in Williamsburg, Virginia. The acquisition expands Terracon's facilities services footprint in Virginia and the mid-Atlantic, and all TAM employees will join Terracon while continuing to operate locally as TAM Consultants, Inc., A Terracon Company.

PS&S Acquires B. Thayer Associates to Expand New York Presence

April 4, 2022

Engineering Services

PS&S has acquired the assets of B. Thayer Associates, a 30-year multi-discipline architecture, engineering, surveying and landscape architecture firm with offices in Woodbury and Long Island City, New York. The acquisition expands PS&S's presence and capabilities in the New York market; founder Barbara Thayer will continue in a leadership role as PS&S pursues a broader infrastructure-focused growth plan.

Tandem Engineering Acquires Ann Arbor Architects Collaborative, Inc.

February 2, 2026

Professional Services

Tandem Engineering has acquired Ann Arbor Architects Collaborative, Inc., a multidisciplinary architecture and interior design firm based in Ann Arbor, Michigan; the deal closed on February 2, 2026. The acquisition expands Tandem’s integrated engineering and project management capabilities by adding architecture, interior design and sustainable-design expertise to its service offering.

Team Group Acquires S.&T. Group

September 6, 2024

Industrial Services

Team Group, a global facility management and industrial services provider, has acquired S.&T. Group, a multi-trade contracting and maintenance business serving Northern Ontario. The deal expands Team Group's presence in the Algoma District and brings in S.&T.'s electrical, HVAC, plumbing, data and general contracting capabilities while retaining the target's existing management and employees.

Adler & Allan Acquires Thomson Environmental Consultants and Atmos Consulting

November 7, 2025

Environmental Services

Adler & Allan, a Goldman Sachs Alternatives-backed environmental services group, has acquired Thomson Environmental Consultants and Atmos Consulting (subsidiaries of Thistle Environmental). The deal expands Adler & Allan's green-collar consulting capabilities across ecology, freshwater/marine consultancy, arboriculture and geospatial services in the UK.

Bowman Consulting Group Acquires Terra Associates, Inc.

December 27, 2021

Engineering Services

Bowman Consulting Group Ltd. (NASDAQ: BWMN) entered into a definitive agreement to acquire Terra Associates, Inc., a Houston- and San Antonio-based civil engineering and surveying firm, with closing scheduled for December 31, 2021. The acquisition, financed with cash, seller financing and stock, is expected to be immediately accretive and to contribute approximately $5.5 million of annualized net service billing while expanding Bowman’s Texas operations and service capabilities.