Capital One gives Brex underwriting edge

Capital One turns Brex from a fast fintech into a bank powered mid market credit machine, and that changes the terms of competition for Flex. Flex can win customers with a better fit for owner operators and a Net 60 card that acts like working capital, but Brex now sits on a much larger balance sheet, far broader embedded distribution, and a revenue base almost 10 times larger.

• Flex sells through local city managers and community events in places like Houston, Atlanta, and Dallas, which works for niche vertical penetration. Brex has added enterprise distribution through partners like Coupa, Navan, Sabre, and Fifth Third, giving it a much wider funnel into finance teams already buying adjacent software and banking products.
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• The funding stack is the core gap. Flex relies on a partner bank model while owning more of the credit exposure through Net 60, Bill Pay Later, and Flex Capital. Brex now has Capital One behind it, which can fund receivables more cheaply and absorb losses across a far larger balance sheet.
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• Scale compounds the underwriting edge. Flex is estimated at about $75M in annualized revenue in 2025, versus Brex at $700M in August 2025 before the acquisition. More card spend, more repayment history, and more product touchpoints usually produce better credit models, especially in the mid market where cash flow quality changes fast.
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Going forward, Flex is likely to lean harder into verticals where local trust, industry specific payment timing, and hands on underwriting matter more than lowest cost capital. Brex and Capital One can press the broader mid market, while Flex’s opening is to stay best where receivables cycles are messy and generic bank software still does not fit.