December 5, 2025

Flex, a New York based startup also known as Flexbase, closed a $60 million Series B round to expand its suite of financial services for business owners and wealthy entrepreneurs. The company plans to build AI‑powered finance agents, roll out an invite‑only “Flex Elite” card that competes with American Express’s Centurion card, and provide private banking functions normally reserved for ultra‑high‑net‑worth clients. Flex’s focus on entrepreneurs with annual sales between $3 million and $50 million offers a glimpse into how AI can unlock bespoke banking services for those who straddle business and personal finances.

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Entrepreneurs are no strangers to juggling business and personal finances. For founders whose companies generate millions in revenue but lack a formal CFO, high‑end banking tools can feel out of reach. Flex, founded in 2023 and now operating out of New York, wants to change that narrative. After raising a $60 million Series B round led by New View Capital with participation from Long Journey Ventures and Division Capital, Flex’s total funding has climbed to $105 million. The fresh capital gives the company the runway to build what CEO Zaid Rahman calls an “army of AI agents” that act as a bespoke finance team for growing businesses.

Flex’s core platform combines personal and business banking functions with enterprise resource planning, credit, and payments tools. The startup serves what it calls “jumbo shrimp” firms, companies with annual sales between $3 million and $50 million where the owner often doubles as CEO and CFO. These individuals typically have high personal incomes, sometimes up to $20 million, and commingled family, personal and business accounts. Traditional banks view them as too small for private‑banking desks yet too complex for mass‑market products. Fintech competitors like Brex and Mercury offer modern tools but rarely cater to the founder’s holistic financial picture.

To bridge that gap, Flex plans to embed artificial intelligence throughout its product ecosystem. Rahman says the company is developing agentic AI tools that can perform time‑consuming finance tasks, everything from invoice reconciliation and cash‑flow forecasting to identifying tax‑deductible expenses. Importantly, Flex still employs human finance experts to validate AI recommendations, a safeguard meant to reassure risk‑averse business owners. Rahman’s vision is to create an on‑demand team that touches every dollar of revenue from the moment a client invoices to the moment they spend it personally. It’s like outsourcing a finance department without paying for full‑time staff.

Perhaps the splashiest element of Flex’s strategy is its upcoming “Flex Elite” card. The invite‑only credit card will offer travel, dining and hotel perks similar to American Express’s iconic Black Card. Rahman says it’s designed for entrepreneurs who spend at least $500,000 personally each year and want a single card that covers both corporate and lifestyle expenses. Flex already offers a Visa Infinite business card with up to 60 days of interest‑free credit and business‑focused benefits. The new card goes further by bundling concierge services and luxury experiences typically reserved for ultra‑high‑net‑worth individuals. In effect, Flex is betting that founders want premium perks without giving up the flexibility of a modern fintech platform.

For investors, Flex’s bet is compelling because mid‑sized companies represent a massive yet underserved market. In the U.S., businesses earning $3 million–$50 million collectively drive a significant portion of GDP yet often lack tailored financial services. Many founders manage finances in spreadsheets, juggle personal credit cards, and rely on outdated software. By integrating AI, Flex can offer, personalised insights at scale, potentially tripling payment volumes; the company says it processed $3 billion this year. Beyond cards, the startup plans to expand into private credit, asset management and wealth advisory. Its long‑term goal: become a one‑stop shop for entrepreneurs’ financial lives.

The $60 million raise also underscores investors’ appetite for startups applying AI to traditional finance. Although macroeconomic uncertainty persists, the private‑credit market is booming, and mid‑market enterprises are seeking tech solutions to simplify operations. Flex’s ability to deliver human‑validated AI could differentiate it from rivals that rely solely on automation. If successful, the company may not only challenge American Express but also inspire other fintechs to blend high‑touch service with machine intelligence.

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