Flex, the AI-native private banking platform for high-net-worth middle-market business owners, has raised $60 million in Series B funding led by Portage, bringing total equity funding to $105 million. The company is experiencing rapid growth—revenue has quadrupled, annualized payment volume has reached $3 billion, and customers now use an average of 4 or more Flex products—as it integrates private credit, payments, ERP, and personal finance into a unified system. The new capital will accelerate the rollout of Flex Elite, an invite-only card competing with Amex Centurion, and support the development of AI agents that function as an “AI CFO,” enhancing underwriting, payments, cash management, and operational workflows.

Flex Raises $60m Series B to Scale AI Private Bank