SI Solutions, LLC (SIS) acquired Radiological Solutions, Inc. (RSI), a nuclear engineering firm based in Illinois, on February 2, 2026. The deal's value was not disclosed, but it involved SIS acquiring full ownership of RSI to bolster its capabilities in the nuclear energy sector.
Transaction overview
On February 2, 2026, SI Solutions, LLC acquired Radiological Solutions, Inc., a specialized firm providing advanced plant chemistry and radiation management services for nuclear power facilities. Founded in 2004, RSI is headquartered outside Chicago, Illinois, with expertise in water chemistry optimization, radiological dose management, emergency preparedness planning, and the design of sampling systems used to monitor and control conditions in nuclear plants. The acquisition was structured as a buyout by SIS’s advanced engineering division, Structural Integrity Associates, Inc., without disclosure of the financial terms or the involvement of investment bankers.
Deal structure and financing
Details on the financial structure and funding of the RSI acquisition remain undisclosed. No specific information is available regarding equity contributions, debt financing arrangements, or any retained stake for sellers. Given SIS’s backing by MidOcean Partners, a New York-based private equity firm with significant experience in middle-market investments, it is likely that the deal was funded through a combination of existing capital and fresh equity injections from SIS/MidOcean. Regulatory filings and lock-up terms are not publicly available.
Strategic context
SI Solutions pursued RSI to enhance its service offerings within the nuclear energy sector, particularly focusing on water chemistry optimization, radiological controls, radiation protection, and emergency preparedness planning. The acquisition aims to create a more comprehensive solution provider for operational challenges in both existing nuclear power plants and future reactor designs. For RSI, the sale could represent an opportunity to scale its operations under a larger parent company with broader reach and resources.
Regulatory path
No specific regulatory hurdles or filings were reported regarding this transaction. Given the nature of SIS’s business activities and the geographical locations of both companies, potential oversight may have involved state-level energy commissions in Illinois or federal agencies like the Nuclear Regulatory Commission (NRC). However, as details on financing terms are lacking, there is no information available about any required remedies or regulatory reviews that might affect the deal.