Capital One is buying Brex in a $5.15 billion stock-and-cash deal that underscores how traditional banks are turning to fintech startups to modernize the way businesses manage money.

The acquisition, announced Thursday, would bring Brex, the San Francisco–based corporate card and expense management company, into the fold of one of the largest U.S. financial institutions. The transaction is expected to close in mid-2026, pending........

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