Blackstone Makes Minority Growth Investment in Salas O'Brien
January 22, 2024
Blackstone (through Tactical Opportunities and affiliated funds) has made a minority structured growth equity investment in Salas O’Brien, an employee-owned engineering and technical services firm headquartered in Irvine, California. The investment will support Salas O’Brien’s continued expansion in the AEC market — enhancing talent, technology resources, and capability to serve decarbonization, energy transition and critical infrastructure projects; Caltius Structured Capital will remain a minority investor alongside Blackstone.
- Buyers
- Blackstone, Caltius Structured Capital
- Targets
- Salas O'Brien
- Industry
- Engineering Services
- Location
- California, United States
- Transaction Type
- Growth capital
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Caltius Structured Capital Invests in Salas O'Brien
October 20, 2020
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Caltius Structured Capital closed a growth capital investment in Santa Ana–based Salas O'Brien to support the firm's national expansion through strategic mergers and organic growth. The structured financing (including junior debt and minority equity) is intended to preserve employee ownership while fueling Salas O'Brien's growth across its facility engineering, construction management, technology and commissioning services.
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Salas O'Brien Acquires TechSource
January 1, 2026
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Salas O’Brien has merged with TechSource, bringing TechSource’s scientific and engineering consulting capabilities into Salas O’Brien’s employee‑owned engineering platform. The deal combines TechSource’s deep expertise in national security, nuclear, and high‑tech projects (supporting U.S. national laboratories and federal agencies) with Salas O’Brien’s engineering scale to expand capabilities for federal and critical‑infrastructure programs.
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Salas O'Brien Acquires Chavez-Grieves Consulting Engineers
March 31, 2025
Engineering Services
Salas O’Brien announced that Chavez-Grieves Consulting Engineers has joined the firm, bringing over 45 years of structural engineering, investigative engineering, and project management experience. The acquisition expands Salas O’Brien’s structural capabilities and geographic reach to better serve high-demand end markets including data centers, healthcare, and government.
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Salas O'Brien Acquires Carolina Engineering Solutions
April 22, 2025
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Salas O'Brien announced that Carolina Engineering Solutions of Greenville, South Carolina has joined the firm, strengthening Salas O'Brien’s mechanical, electrical, and plumbing (MEP) design capabilities. The acquisition expands Salas O'Brien’s capacity to serve education, healthcare, and government clients and enables the combined firm to pursue larger, more complex projects.
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Blackstone Makes Minority Investment in Sia Partners (up to €250M)
December 17, 2024
Consulting
Funds managed by Blackstone's private equity strategy will make a minority investment of up to €250 million in Sia Partners. Founder and CEO Matthieu Courtecuisse retains a significant majority stake and will continue to lead the firm; the capital will support Sia's U.S. expansion, capability development (notably in AI), and strategic M&A.
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Salas O'Brien Acquires FA Engineering
March 24, 2025
Engineering Services
Salas O’Brien has merged with FA Engineering, adding FA Engineering’s industrial engineering, structural and mechanical design, and environmental compliance capabilities to Salas O’Brien’s platform. FA Engineering is based in Pocatello, Idaho and the combined organization expands Salas O’Brien’s capacity to serve industrial end markets including mining, food processing, and waste treatment.
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