The Action Layer Episode 4: Rex Salisbury, Founder and GP of Cambrian VC

The Action Layer is a video interview series from Atomic exploring the space between fintech ideas and real-world outcomes. At SF Fintech Week, Atomic CEO and Co-Founder Jordan Wright sat down with founders, investors, and operators to discuss what's actually working, what's breaking in practice, and what it takes to turn innovation into real impact. New episodes drop weekly — follow along on YouTube.

Fintech has produced some of the most valuable private companies in the world. And it has captured somewhere between 1-2% of global financial services revenue.

That's not a failure. For Rex Salisbury, founder and GP of Cambrian, it's the whole point. Ninety-eight percent of the opportunity is still sitting there. The question he's focused on is what makes this moment different from every other moment someone has tried to go after it.

Rex went from investment banker to fintech software engineer to fintech investor at Andreessen Horowitz before going out on his own to build Cambrian, a pre-seed and seed fund with a community of over 1,500 fintech founders. He joined Jordan at SF Fintech Week for the final episode of The Action Layer's SF series — a wide-ranging conversation about where fintech actually stands, what's about to break for incumbents, and what it takes to build something that genuinely changes how people behave with money.

In this episode, Jordan and Rex get into why this moment is fundamentally different from the last ten years in fintech. How better talent, more mature infrastructure, and AI are combining to raise the ambition ceiling for early-stage companies in ways that weren't possible before. Why incumbents that seemed untouchable are starting to show real cracks. And what it means for the first time in fintech history that customers with $80,000 account balances are actively choosing to move their financial lives elsewhere.

The conversation also goes deeper on what Rex actually looks for when backing companies at the earliest stage. Not a hot category or a trending thesis — but founders who have spent years deep inside a specific part of financial services and developed a view that only someone with that experience could have. And it closes with a thesis on where the biggest bundles in consumer and B2B financial services are headed and why the fee stream that can afford to give everything else away is the one that wins.

In this episode:

• 00:00:06 — Introducing Rex Salisbury and Cambrian VC
• 00:04:32 — Why fintech has only captured 1-2% of global financial services revenue
• 00:05:16 — The talent, infrastructure, and AI trifecta unlocking the next wave
• 00:07:20 — The first cracks in the incumbents and the Intuit example
• 00:14:54 — The Robinhood moment and the mass affluent segment
• 00:20:04 — Why mortgage is the next big thing to watch
• 00:23:50 — Why the best founders have unique insights from deep experience
• 00:37:03 — What actually needs to happen for fintech to change consumer behavior
• 00:39:26 — The B2B bundling thesis and why vertical SaaS monetizes through financial services
• 00:40:35 — Visa, subscriptions, and what's building globally before it hits the US
• 00:42:41 — Does AI embed banking or does banking embed AI?
• 00:43:48 — Why asset management is the fee stream everything else gets bundled around

About Rex Salisbury

Investment banker -> fintech software engineer -> fintech VC (A16Z) -> Solo-GP. proudly based in San Francisco. When not at the office in Jackson Square, Rex is usually outside with his wife chasing their three kids around the neighborhoods, woods and beaches near their home in the Presidio (and foiling at Crissy during naptime).