Key Takeaways
- • MidOcean Partners signed a definitive agreement to sell SI Solutions to a Macquarie Asset Management-led consortium, with close expected in Fall 2026 subject to regulatory approvals and customary closing conditions.
- • SI Solutions is a leading provider of engineering, testing, and software solutions to critical infrastructure markets, headquartered in Huntersville, North Carolina, operating 16 U.S. locations with five testing laboratories and serving over 330 clients.
- • This transaction represents MidOcean's fourth liquidity event in 2026 and another successful exit for the firm's Business Services vertical, demonstrating the fund's track record in middle-market private equity.
- • During MidOcean's ownership, SI completed three strategic add-on acquisitions, expanded nuclear power generation capabilities, and built a comprehensive specialty engineering and advanced testing platform serving power generation and critical infrastructure markets.
- • The sale highlights MidOcean's focused value creation strategy in the engineering and critical infrastructure sector, where the firm has completed multiple investments and successfully executed portfolio exits.
Summary
MidOcean Partners, a premier New York-based alternative asset manager specializing in middle-market private equity, announced on September 10, 2026, that it has signed a definitive agreement to sell SI Solutions, Inc. and its subsidiaries to a Macquarie Asset Management-led consortium. The transaction is expected to close in Fall 2026, pending regulatory approvals and customary closing conditions.
SI Solutions operates as a leading provider of engineering, testing, and software solutions serving critical infrastructure end markets across the United States and internationally. The company provides technical expertise and services designed to enhance reliability and resiliency of U.S. power markets, ensure safety and regulatory compliance of critical assets, and support expansion of public and private infrastructure. Based in Huntersville, North Carolina, SI operates from 16 locations across the country, including five dedicated testing laboratories, and currently serves more than 330 clients.
During its ownership period, MidOcean executed a focused value creation strategy centered on building a comprehensive specialty engineering, advanced testing, and digital platform serving nuclear and natural gas power generation as well as critical civil and natural gas infrastructure sectors. The portfolio company completed three strategic add-on acquisitions under MidOcean's stewardship, expanded its service offerings specifically for nuclear power generation and advanced reactors, and developed a holistic go-to-market strategy. Elias Dokas, Managing Director at MidOcean, noted the firm's pride in partnering with SI's management team to drive significant growth and strategic transformation.
This transaction marks MidOcean's fourth liquidity event in 2026 and represents another successful exit from the firm's Business Services vertical. The sale underscores MidOcean's demonstrated capability in identifying, acquiring, and building value in engineering and critical infrastructure businesses serving essential U.S. markets.
SI Solutions operates as a leading provider of engineering, testing, and software solutions serving critical infrastructure end markets across the United States and internationally. The company provides technical expertise and services designed to enhance reliability and resiliency of U.S. power markets, ensure safety and regulatory compliance of critical assets, and support expansion of public and private infrastructure. Based in Huntersville, North Carolina, SI operates from 16 locations across the country, including five dedicated testing laboratories, and currently serves more than 330 clients.
During its ownership period, MidOcean executed a focused value creation strategy centered on building a comprehensive specialty engineering, advanced testing, and digital platform serving nuclear and natural gas power generation as well as critical civil and natural gas infrastructure sectors. The portfolio company completed three strategic add-on acquisitions under MidOcean's stewardship, expanded its service offerings specifically for nuclear power generation and advanced reactors, and developed a holistic go-to-market strategy. Elias Dokas, Managing Director at MidOcean, noted the firm's pride in partnering with SI's management team to drive significant growth and strategic transformation.
This transaction marks MidOcean's fourth liquidity event in 2026 and represents another successful exit from the firm's Business Services vertical. The sale underscores MidOcean's demonstrated capability in identifying, acquiring, and building value in engineering and critical infrastructure businesses serving essential U.S. markets.
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