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Flex

Category: AI in Fintech

AI-native private banking platform that combines business credit, personal finance, payments, and ERP operations into a unified financial ecosystem for high-net-worth business owners Flex was founded in 2023. The company is led by Zaid Rahman. Based in San Francisco, California, United States. Team size: 51-200. Total funding raised: $105M equity + $300M debt facilities. Latest round: Series B. Key investors include ["Portage","CrossLink Capital","Spice Expedition","Titanium Ventures","Wellington","Companyon Ventures","Florida Funders","FirstLook Partners","Tusk Venture Partners","MS&AD Ventures","Restive","Victory Park Capital"].

Founded
2023
Headquarters
San Francisco, California, United States
Team size
51-200
Total funding
$105M equity + $300M debt facilities

Value proposition

All-in-one AI-native financial platform that unifies business and personal finance with AI-powered automation, replacing fragmented banking and finance tools

Products and solutions

["Private Credit","Business Banking","Personal Finance","AI-Powered Payments","Expense Management","AP/AR Automation","Global Payments","Flex Elite Card"]

Unique value

AI-native approach built from ground up rather than added to legacy systems, combining private banking with AI agents that create a self-improving feedback loop across all financial operations

Target customer

High-net-worth business owners running companies with $3M-$100M revenue

Industries served

["Cross-industry","Middle-market businesses","High-net-worth entrepreneurs"]

Technology advantage

Agentic underwriting system using AI-powered risk models that improve with every transaction, creating smarter risk pricing and scalable operations with stronger margins

How they differentiate

Vertically integrated AI-native platform targeting underserved middle-market segment with unified business-personal finance approach, creating data feedback loops that improve risk models and customer stickiness

Main competitors

["American Express","Traditional private banks","Brex","Ramp"]

Key partnerships

["Thread Bank (banking services)","Lead Bank (credit cards)","Visa (payment network)"]

Notable customers

["Innovaquant","Betr","Mod Partners","VIP Completions"]

Major milestones

["$60M Series B funding (Dec 2025)","$200M credit facility from Victory Park Capital (Mar 2025)","First FinTech to launch Visa Infinite Business Credit Card (Jul 2025)","$3B payments volume milestone","25,000+ businesses served","AI-native private banking platform launch"]

Growth metrics

$3B+ payments volume (3x growth in 12 months), 25,000+ businesses served, 4+ products per customer average, quadrupled revenue in 12 months

Market positioning

AI-native private bank for America's overlooked middle-market business owners who employ 40% of Americans but are underserved by traditional financial institutions

Geographic focus

United States with plans for international expansion

Patents and IP

Not publicly disclosed

About Zaid Rahman

Founder & CEO of Flex (formerly Flexbase), Thiel Fellow, Founder of 305 Ventures. Previously focused on solving cash flow problems in construction industry with Flexbase, which evolved into the broader Flex platform.

Official website: