The Series A funding closed by Flex brings its total capital raised to $18 million.WHO: Flex is the HSA/FSA payments infrastructure for top health and wellness brands. Built for omnichannel retailers, Flex helps businesses unlock over $150 billion in pretax health spending—boosting AOV by up to 50% without adding new acquisition channels. From recurring payments to mixed-eligibility carts, Flex integrates seamlessly into brands' existing tech stack and handles the complexity of HSA/FSA. Already powering HSA/FSA payments for hundreds of brands, Flex is expanding its reach through new partnerships with leading retailers such as Dermstore, iFit, and Therabody.WHY: Flex will leverage the new funding to position HSA/FSA as a powerful growth channel for enterprise retailers—scaling its team, enhancing core platform capabilities, and delivering a best-in-class shopping experience for consumers.IN THEIR OWN WORDS: “We’re building the financial infrastructure that connects people’s health benefits to the products and services that genuinely support their everyday wellbeing,” said Sam O’Keefe, CEO of Flex. “This funding allows us to partner with the most influential health and wellness retailers, making it simple for millions of Americans to put their healthcare dollars to work. Health today extends far beyond the doctor’s office—it’s in our homes, our movement, and the daily choices we make. Our goal is to ensure the brands empowering healthier living are just as seamless to buy from as any other retailer.