Key insight: Capital One will expand its business payments capabilities by acquiring Brex for $5.15 billion in cash and stock.Processing ContentWhat's at stake: Brex offers corporate card services, expense management and payments solutions for businesses, especially startups. Forward look: Capital One expects the deal to close in mid-2026.This is a developing story. It will be updated. Capital One Financial announced Thursday that it will acquire payments-focused fintech Brex in a deal valued at $5.15 bi ...