Third-party administrator The Retirement Advantage acquired Total Retirement Solutions.
Terms of the deal, which closed May 31 and was announced Monday, weren't disclosed.
The acquisition aims to help Wisconsin-based TRA serve plan advisers and sponsors in the St. Louis metro area and the surrounding Midwest region as it continues its national expansion, Matt Schoneman, TRA's president and owner, said in the news release.
TRA currently serves more than 10,000 plan sponsors with more than $10 billion in retirement assets under administration, the news release said.
Mr. Schoneman did not reply to an email requesting information about the number of plan sponsors joining TRA's platform as part of the transaction.
The acquisition is TRA's fourth this year. In May, it bought John T. Toomey Associates of Hingham, Mass., following purchases earlier in the year of Rosenfeld/Tortu Retirement Planning Co., Elmsford, N.Y., and R. Bruce Tanner & Associates, Sugar Hill, Ga.