About Flex
Flex is a company based in San Francisco (United States) founded in 2023 by Sam OKeefe. It operates as a API-as-a-Product, and FinTech. Flex has raised $18.7 million across 3 funding rounds from investors including Heirloom Ventures, Y Combinator and SV Angel. Flex offers products and services including HSA/FSA Payment Infrastructure, Shopify Payment App, Web API Checkout, and Letter of Medical Necessity. Flex operates in a competitive market with competitors including Greenphire, Cedar, Zelis Healthcare, PayZen and Alegeus, among others.
- Headquarter San Francisco, United States
- Founders Sam OKeefe
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Sectors
Financial Services
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Email
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Phone
*********
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Website
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Social
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Annual Revenue
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Net Profit
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EBITDA
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Total Equity Funding
$18.7 M (USD)
in 3 rounds
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Latest Funding Round
$15 M (USD), Series A
Sep 02, 2025
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Investors
Heirloom Ventures
& 8 more
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Employee Count
Employee Count
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Products & Services of Flex
Flex offers a comprehensive portfolio of products and services, including HSA/FSA Payment Infrastructure, Shopify Payment App, Web API Checkout, and Letter of Medical Necessity. The company's diverse product and service offerings are designed to meet the evolving needs of its customers, address market demands, and provide comprehensive solutions that drive value creation and customer satisfaction across various segments and use cases.
HSA/FSA payments are enabled for seamless checkout experiences.
HSA/FSA payments are integrated into Shopify checkout systems.
API for HSA/FSA payments is provided for websites.
Compliance with HSA/FSA rules is supported through documentation.
Unlock access to complete
Funding Insights of Flex
Flex has successfully raised a total of $18.7M across 3 strategic funding rounds. The most recent funding activity was a Series A round of $15 million completed in September 2025. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding Total Funding
- Total Rounds 3
- Last Round Series A — $15.0M
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First Round
First Round
(01 Jun 2023)
- Investors Count 9
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Sep, 2025 | Amount | Series A - Flex | Valuation | First Round Capital , Core Innovation Capital | |
| Sep, 2024 | Amount | Seed - Flex | Valuation | Y Combinator , SV Angel | |
| Jun, 2023 | Amount | Seed - Flex | Valuation |
investors |
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| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
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| Jul, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Feb, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Jan, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Feb, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
Investors in Flex
Flex has secured backing from 9 investors, including venture fund and institutional investors. Prominent investors backing the company include Heirloom Ventures, Y Combinator and SV Angel. This diverse investor base provides strategic capital, industry expertise, and valuable network connections that support the company's growth initiatives, market expansion, and long-term value creation.
| Investor | Description | Founded Year | Domain | Location |
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Early-stage startups are accelerated via funding and educational programs.
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Founded Year | Domain | Location | |
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Early-stage investments are provided to transformative technology companies.
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Founded Year | Domain | Location | |
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Venture capital investments in pre-seed and seed stages, focusing on founders.
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Founded Year | Domain | Location |
| Investor | Description | Founded Year | Domain | Location |
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Single family office of Amitabh Bachchan, founder of Amitabh Bachchan Corporation or AB CORP
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Founded Year | Domain | Location | |
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Startup ecosystems are ignited through strategic investments by Signite Partners.
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Founded Year | Domain | Location | |
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Venture capital is directed toward companies in multiple sectors.
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Founded Year | Domain | Location | |
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Venture capital is invested in cybersecurity, fintech, and AI startups.
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Founded Year | Domain | Location |
Investments & Acquisitions by Flex
| Company Name | Description | Domain | Location | Founded Year | Amount |
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Bionic investment advisor platform
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2016 | ||||
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Fine Asian gourmet food is offered by an internet-first restaurant.
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2016 | ||||
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Physical e-commerce kiosks are deployed for rural purchases in Indonesia.
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2014 | ||||
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Fine Asian gourmet food is offered by an internet-first restaurant.
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2016 |
Financial Statements - Flex
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Jul, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Feb, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Jan, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Feb, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
Flex Comparisons
Competitors of Flex
Flex operates in a dynamic and competitive business environment, facing competition from various established players and emerging companies in the market. The competitive landscape includes prominent companies such as Greenphire, Cedar, Zelis Healthcare, PayZen and Alegeus, among others. This competitive environment drives innovation, market differentiation, and strategic positioning as companies strive to capture market share and deliver value to their customers. Understanding the competitive dynamics is crucial for assessing market positioning, identifying growth opportunities, and navigating the challenges inherent in a competitive marketplace.
| Company Name | Domain | Founded year | HQ Location | Description |
|---|---|---|---|---|
| domain | founded_year | HQ Location |
Clinical payment technology for patient transactions in research is provided.
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| domain | founded_year | HQ Location |
Cloud-based payment solutions are provided for healthcare billing and analytics.
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| domain | founded_year | HQ Location |
Digital solutions to modernize the healthcare financial experience for payers, providers, and members
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| domain | founded_year | HQ Location |
AI medical billing software for healthcare professionals and organizations
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| domain | founded_year | HQ Location |
Healthcare benefits are administered via tax-advantaged account platforms.
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| domain | founded_year | HQ Location |
Revenue cycle management platform for healthcare centers is offered.
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| Company Name | Domain | Founded year | HQ Location | Description |
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| domain | founded_year | HQ Location |
Multiple services are booked via an app-based platform.
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| domain | founded_year | HQ Location |
On-demand services are booked through an app-based platform.
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| domain | founded_year | HQ Location |
App based platform offering on demand delivery and ride-hailing services
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| domain | founded_year | HQ Location |
Operates an on-demand hyperlocal delivery app for food and groceries.
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Latest news on Flex
Frequently Asked Questions about Flex
When was Flex founded?
Flex was founded in 2023.
Where is Flex located?
Flex is headquartered in San Francisco, United States. It is registered at San Francisco, California, United States.
Who is the current CEO of Flex?
Sam OKeefe is the current CEO of Flex. They have also founded this company.
Is Flex a funded company?
Flex is a funded company, having raised a total of $18.7M across 3 funding rounds to date. The company's 1st funding round was a Seed of $500K, raised on Jun 01, 2023.
What does Flex do?
HSAFSA payment infrastructure is offered by Flex to enable seamless transactions for health and wellness brands. Solutions are designed for e-commerce integration, supporting Shopify, web APIs, and compliance tools like Letters of Medical Necessity. Industries such as fitness, skincare, and supplements are served, with a focus on increasing conversion rates and average order values. Enterprise-scale operations, including subscriptions and high-volume transactions, are supported through customizable and reliable technology.
Who are the top competitors of Flex?
Flex's top competitors include Greenphire, Cedar and PayZen.
What products or services does Flex offer?
Flex offers HSA/FSA Payment Infrastructure, Shopify Payment App, Web API Checkout, and Letter of Medical Necessity.
Who are Flex's investors?
Flex has 9 investors. Key investors include Heirloom Ventures, Y Combinator, SV Angel, Precursor Ventures, and Liquid 2 Ventures.