November  3, 2025 – Dallas, TX – Corgan, a global architecture and design firm, announces the acquisition of Cooper Robertson, a New York–based practice known for its influential work in architecture, urban design, and master planning. This acquisition broadens Corgan’s expertise across public, cultural, and educational environments and strengthens the firm’s presence in the Northeast through an expanded team and design portfolio.

October 31, 2025 – Denver, CO – Spheros Environmental (Spheros), a fast-growing provider of science-forward environmental consulting services, announces the acquisition of Ironwood Consulting (Ironwood), a California-based firm known for its expertise in biological resources, habitat mitigation and monitoring, environmental permitting, and data-driven field services. The acquisition expands Spheros’ national footprint and strengthens its capabilities in ecological assessment, regulatory compliance, and digital field data management for infrastructure and natural-resource development projects.

October 30, 2025 – Boston, MA – Cumming Group, a North American leader in project‑management and cost‑consulting services, announces that LeftField, a New England‑based owner’s project‑management consultancy, has joined the firm. The integration expands Cumming Group’s presence in the Northeast, notably increasing its New England headcount to over 150 professionals and enhancing its capacity to serve public and private clients across K–12, higher education, life sciences, and municipal infrastructure markets.

October 29, 2025 – Charlotte, NC – Southern Engineering & Testing, P.C., a geotechnical engineering, materials testing, and special inspections firm, announces the acquisition of Tai & Associates, PLLC, a Raleigh‑based geotechnical engineering firm with a 44‑year legacy. This acquisition strengthens Southern Engineering’s Raleigh office and expands its geotechnical capabilities across the Carolinas through the integration of Tai’s experienced team and project expertise.

October 28, 2025 – Rochester, NY – Salas O’Brien, a national engineering and technical services firm, announces the acquisition of M/E Engineering, a New York-based mechanical, electrical, plumbing, fire protection and sustainable design firm with over 200 professionals across Rochester, Buffalo, Schenectady and Syracuse. This strategic merger expands Salas O’Brien’s service offerings in upstate New York and enhances its capabilities in the healthcare, education, government and commercial sectors.

October 28, 2025 – Dallas, TX – Trinity Consultants, a global consulting firm delivering environmental health & safety (EHS) and built‑environment services, announces the acquisition of JB&B (Jaros, Baum & Bolles), a New York‑based firm specializing in mechanical, electrical, plumbing and fire‑protection engineering. This landmark deal bolsters Trinity’s Built Environment division with advanced MEP/FP expertise and supports integrated solutions across landmark commercial, healthcare, life‑science, aviation and data‑center projects.

October 27, 2025 – Rochester, NY – LU Engineers (also known as Joseph C. Lu Engineering, PC), a full‑service engineering firm, announces the acquisition of Eisenbach & Ruhnke Engineering, a Utica‑based multidisciplinary firm specializing in mechanical, electrical, and plumbing engineering. This acquisition expands LU Engineers’ footprint in New York State, broadens its MEP service offerings, and strengthens its ability to serve municipal and infrastructure clients across the region.

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