Thomas H. Lee Partners and Warburg Pincus are selling the rest of their stock in Umpqua Holdings in Portland, Ore.

The $22.5 billion-asset Umpqua filed documents Tuesday for the secondary offering, disclosing that the private equity firms will collectively sell roughly 28.3 million shares of stock, or a 13 percent stake in the company. Another 2.9 million shares, borrowed by an affiliate of Barclays, will be sold to hedge exposure to certain warrants.

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