November  24, 2025 – Chicago, IL – Egis, a global leader in architecture, consulting, construction engineering, operations, and mobility services, announces the acquisition of RockSol Consulting Group, Inc., a Colorado‑based transportation infrastructure firm with more than 240 employees. RockSol brings deep expertise in highway, bridge, transit, and public‑works project delivery — including engineering, planning, environmental compliance, design, construction management, inspection, and materials testing — primarily serving municipalities, state DOTs, and federal agencies throughout the Western U.S.

November 20, 2025 – Sacramento, CA – Lionakis, a multidisciplinary architecture, structural engineering, and interior design firm, announces the acquisition of obrARCHITECTURE (obr), a San Diego–based architecture and planning firm. The merger combines two California‑rooted firms with shared values and expands Lionakis’s footprint in Southern California. The addition of the obr team strengthens Lionakis’s service offerings — particularly in education, civic, commercial/hospitality, and healthcare sectors — and enhances its capacity to deliver integrated design solutions with increased architectural depth and expanded geographic coverage.

November 19, 2025 – Mine Hill, NJ – Mainline Environmental, a full‑service provider of environmental solutions, announces the acquisition of HSE Consulting Services, LLC, a Cicero, NY–based firm specializing in environmental, health & safety consulting, laboratory analysis, indoor air quality, industrial hygiene, mold and asbestos services, and compliance support. This strategic acquisition broadens Mainline’s service platform—integrating HSE’s testing, lab, and safety capabilities with Mainline’s remediation, compliance consulting, and remediation services—enabling clients from property owners to municipalities and school districts to leverage a single, technology‑enabled partner for their entire EHS and environmental compliance needs.

November 11, 2025 – St. Louis, MO – BW Design Group, a fully integrated architecture, engineering, and construction firm, announces the acquisition of Malisko Engineering, a nationally recognized system integration and automation company. This transaction enhances BW Design Group’s end‑to‑end solutions for manufacturing, life sciences, and advanced technology clients by incorporating Malisko’s expertise in process controls, industrial networking, and data integration.

For a full list of PSMJ’s transactions, please click here.