Stifel Financial Corp., the Missouri-based investment bank known for snapping up regional rivals and Wall Street castoffs, agreed to buy Barclays plc’s U.S. wealth- management business.

Barclays had about 180 financial advisers in the U.S. managing $56 billion in total client assets as of May 31, St. Louis-based Stifel said Monday in a statement that didn’t include terms. Barclays had bought the unit with other Lehman Brothers Holdings Inc. operations in 2008 and was faulted by regulators last year for inadequate internal controls there.

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