Living 100 Healthy Years: Our Investment in Function Health
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11.20.2025
FirstMark
We are thrilled to announce our investment in Function Health.
Function is on a mission to help people live 100 healthy years by making health testing easy and surfacing personalized insights that will drive long term health. As a part of this vision, Function Health has acquired our portfolio company, Ezra — a pioneer in full-body MRI scanning for early cancer detection. Both preventative action (through Function) and early detection (through Ezra) are critical for helping people live longer, healthier lives, so we couldn’t be more excited to join this powerful combination into its next chapter.
Reactive Healthcare Doesn’t Work
The U.S. faces a massive chronic health crisis. Today, 60% of Americans — nearly 200 million people — live with a chronic condition, and over 40% of those individuals live with two or more. The reactive system built to treat these conditions drives over $1 trillion in annual spend. Yet five of the top ten leading causes of death are still preventable or treatable chronic diseases.
Our current system is backwards — we are treating disease instead of preventing it.
A New Dawn for Consumer Health
Function and Ezra are part of a broader movement: consumers taking control of their health. The $3.7 trillion preventative healthcare market is accelerating. Nearly half of U.S. households now use at least one wearable device. But tracking is just one piece of the puzzle. While we have more data today than ever before, we lack a centralized, actionable, comprehensive view of our health.
At FirstMark, we’ve been investing in preventative health for years. Roon is building a best-in-class, high trust database for people managing chronic disease. Legacy has become the leading men’s fertility clinic in the country. When we first backed Ezra five years ago, the world was battling COVID-19, which only sharpened the world’s focus on prevention and resilience. Since then, Ezra has expanded to nearly 30 cities, with waitlists for dozens more.
Function Health is Positioned for Scale
Function Health understands healthcare must start before symptoms appear. They strategically built around blood testing, which provides a comprehensive window into organ function, metabolic health, nutrient status, and early signs of chronic disease — all in one accessible panel.
Preventative care has long been criticized as a luxury for the wealthy. Function is tackling that head-on: what would traditionally cost well over $10,000 per year, they offer for just $365. In a survey of nearly 800 consumers, nearly half of Function members reported household incomes of $100k or less, proving that this is a product for everyone. Function’s scale is unlocking real affordability — and they’re just getting started.
The business has seen explosive growth, but even more impressive is the product’s retention: people come back, purchase additional tests, and even gift memberships to friends and family.
The Time for a Longevity Platform is Now
We’re entering a new era of personalized medicine, fueled by AI. Tailored insights, smarter diagnostics, and continuous care beyond the doctor’s office are no longer theoretical — they’re expected. Nearly two-thirds of consumers now say they’re open to AI playing a role in their health journey, as long as quality is protected.
We are now at a unique moment in time for a longevity focused leader to emerge. Function Health is emerging as that leader, and users are already asking for more — including one of the top requests: MRI scans.
Function Health’s Partnership with FirstMark
Function’s founders chose FirstMark to join in this oversubscribed round because of our early-stage partnership with Ezra, expertise across digital health, consumer technology, and AI, as well as our strong relationships in premier markets like New York City.
At FirstMark, we back companies that improve consumer health, wealth, and happiness. Longevity — living better for longer — sits at the intersection of all three. Healthier people are more productive, financially secure, and fulfilled. Early detection doesn’t just save lives — it prevents avoidable financial and emotional strain. In an increasingly chaotic world, empowering individuals to take ownership of their health is one of the most profound forms of freedom.
Function Health is poised to become the defining platform in preventative health — delivering personalized insights and interventions, at a scale and cost structure that finally puts the consumer in the driver’s seat.
We couldn’t be prouder to join them on this journey.
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