Shardul Shah of Index Ventures: Wiz, AI Founders and Rising Valuations

Shardul Shah, a partner at Index Ventures and the investor behind Wiz, explains why startup valuations will keep rising and why the firm backs founders before they have a business plan. He joined Index as an intern in 2004 and returned in 2008. He backed Wiz’s founders at their seed round, before there was a market or a business model, and Index went on to invest more than $250 million before Google bought Wiz for $32 billion. Index manages about $17 billion, and Bloomberg reported an 11x DPI on its 2012 fund against an industry average of 1.5x. In this 44-minute interview on Sourcery, Molly O’Shea talks with Shah in Index’s New York office about taste versus “industrialized” venture, conviction, the next wave of young AI founders, whether Wiz sold too early, and how the exit market is changing.

TLDW

Shah argues that venture is industrializing around patterns and scale, and that Index competes on taste: listening to founders rather than screening them. On price, his view is that more capital chasing a limited set of outcomes means valuations will only rise. Being “cute on price” has cost Index its best deals, and a gap of 25% shouldn’t stop an investment. He describes Index’s investment committees, the young founders behind Flapping Airplanes, Simile and Parallel, and why cybersecurity is a permanent category whose leaders will change. He also covers the odd recruiting effect of high valuations, concentration versus diversification, shorter fund cycles, and a healthy M&A market.

Thoughts

The most revealing moment comes when Shah admits that higher valuations now help startups hire. On paper it makes no sense: an employee should prefer a lower strike price, with a smaller tax bill and more upside. In practice, he says, a high price works like a luxury good, signaling scarcity and pulling in talent. Put that next to his other claims, that prices will keep rising and that Index loses its best deals by quibbling over price, and you have a self-reinforcing loop. Rich valuations attract talent, talent supports the next round, and the next round justifies the valuation. Shah says plainly that he is “not totally comfortable” with it. He also concedes later that concentration “can really hurt” when the market turns. That candor is worth more than the forecast. A market where price works as a status signal is exactly the kind that ends up rewarding the investors who held back.

Shah’s line about not confusing outcomes with judgment is the most useful thing in the interview for anyone who invests. When O’Shea reads out Index’s DPI figures, he says he doesn’t remember how much the firm owns in any company, and that returns partly reflect how “effervescent” the market was. He wants credit for the consistency over three decades, not any single fund. His views on portfolio size follow from that. Index won’t write a thousand $2 million checks, because it couldn’t actually help a thousand companies. Instead it keeps 30 to 35 positions per venture fund and doubles down on winners across its seed, venture and growth funds, as it did with Wiz. The phrase “not getting high on your own supply,” about keeping DPI honest for limited partners, is a good discipline in a year when paper markups are everywhere.

The Wiz exchange shows two good investors disagreeing openly. Gili Raanan, who sat on the Wiz seed board with Shah, says the company sold too early. Shah calls that “convenient to say” while agreeing that public security companies are heading toward a trillion dollars in value. His more interesting point is about who wins next. The category is permanent, but its leaders will change. He is betting that AI-native companies like 7AI can merge several security budgets into one product. His parachute line, choosing between loosely stitched fabric and “one clean sheet” of the latest material, is a sharp case for platform consolidation. It also neatly sidesteps how often buyers keep choosing the stitched-together incumbent.

The Cartesia story is the best evidence for Shah’s “listen, don’t screen” philosophy. He gave Cartesia’s founder the textbook advice to shut down a successful side of the business and focus. The founder got angry, ignored him, and turned out to be right. Shah’s lesson is that his job was to disagree and then fully back whatever the founder decided. It is a thoughtful stance, but it is easier to hold at a firm with Index’s record than at a fund still proving itself. Duality is what he says he listens for: imaginative and operational, creative and detail-oriented. It is hard to measure, which is exactly why he thinks pattern-matching firms miss it.

The closing story about his wife as Index’s “shadow investment committee” is more than a charming ending. She ignores the substance of his pitches and listens only for how he feels, and she can tell when his conviction is real. That fits his answer to what is hardest about winning deals: not price, but conviction. In a market where every firm has the same data, the scarce input is an honest read of your own belief, and sometimes someone else has to supply it.

Key Takeaways

Index started 30 years ago with three people and now has 93. Shah says people, not assets under management, are the metric he thinks about most.
Venture has “industrialized” over the last five years around patterns, numbers and scale. Shah argues that makes Index’s focus on taste and judgment stand out more.
Index’s notable investments include Revolut, Datadog, Wiz, Adyen, Robinhood, Figma, ClickHouse and Roblox, and Shah says many different partners have led its winners rather than one or two stars.
Index invested in Wiz before there was a business plan, on the strength of the founders. Shah had sat on the board of their previous company for years.
Shah listens for “duality,” founders who are both imaginative and operationally precise, because it predicts adaptability when AI changes the market every few months.
On valuations: more capital is flowing into private markets and the set of big outcomes is still finite, so prices will keep rising. Being “cute on price,” as with GitHub, has cost Index its best outcomes.
A 25% price gap doesn’t matter. A 2x gap is a signal to ask what the other investor believes that Index doesn’t.
At Index’s investment committees, founders present for 30 to 45 minutes and partners deliberate for the same time. Quorum grows with check size, from about three partners for $1 million to six or more for $100 million or more.
Index systematically underestimates the size of category-defining companies. Believing in founders more than they believe in themselves lets it double down over time.
Index has no thematic screen. It backed the under-23 team at Flapping Airplanes before the founders knew what they would build, and Shah says they will “break some world records” in the coming months.
Shah says public security companies are approaching a trillion dollars in combined value. The category is permanent, but AI-native players can merge budgets and displace incumbents.
High valuations now help recruiting through a “luxury product effect,” despite the worse economics for employees.
Fund cycles have compressed from about two and a half years as deal pace and check sizes rose. M&A is healthy, including private-to-private mergers, while the IPO window can’t be timed.

Chapters

00:54 How Venture Has Industrialized

Shah describes Index growing from three people to 93 while keeping its attention to taste, which shows even in the office’s travertine and linen. He says venture in the last five years differs sharply from the previous 25, with firms leaning on patterns, measurement and scale. He is proudest that a long list of partners across generations have produced outlier results. That is unusual in an industry where returns usually cluster around one or two star partners.

05:35 Backing People Before Business Plans

Index invested in Wiz on Shah’s birthday, before there was a market, a business model or any metrics. He had served on the founders’ board a decade earlier and knew their flaws and quirks. He doesn’t arrive with a list of traits. He listens for the defining moments that drive a founder’s motivation and grit. He accepts that pattern screens support scale, but says to him “that’s not a craft.”

09:17 What Stays Durable When AI Moves This Fast

Asked whether AI will replace venture capital, Shah says relationships, taste and judgment can last, though Index is changing its own work with AI. With model capabilities jumping every few months, what keeps customers today may not keep them tomorrow. The constant is adaptable founders, and the signal he looks for is duality: creative imagination paired with operational excellence.

11:35 Why Index Doesn’t Worry About Valuations

Shah calls himself a University of Chicago economist and makes a supply-and-demand case. More capital is chasing a finite set of large outcomes, and in competitive markets irrational pricing is rational. Prices are high and will go higher. Index’s mistakes, GitHub among them, came from being cute on price. A 25% gap is noise, while a 2x gap prompts a closer look at what others believe.

15:12 No Longer an Underdog, and Inside the Investment Committee

Index started as a Europe-focused underdog. Given its returns, Shah says it now needs to grow past its discomfort with publicity. The hardest part of winning deals is conviction, which depends on the personal connection between a partner and a founder. Committees are conversational, scaled by check size, and designed to show founders the relationship they will have with the whole group. Junior investors are briefed before and after so they learn from each decision.

18:25 The Founder Who Proved Him Wrong, and Learning to Say No

Shah told the founder of Cartesia, a voice AI company, to shut down a successful part of the business. The founder ignored him and was right. Shah’s first blog post was about learning to say no, aimed at the Wiz founders when they were running their previous company. Wiz later turned down Google’s first acquisition offer and accepted the second. His other lesson for future investors is that Index systematically underestimates how big category-defining companies can get.

22:59 The Next Wave of AI Founders

Index has partners with deep expertise in fintech, marketplaces, security, robotics and consumer, but Shah says it invests in people rather than themes. It wasn’t looking for founders aged 26 and under, yet it backed several: at Flapping Airplanes, at Simile, the simulation startup, and at Cartesia. It also backed Parallel at the seed stage on Shah’s view of its founder’s character, not his fame. Flapping Airplanes is a vertically integrated company run by “the greatest army of under 23 year olds,” and he hints at coming world records.

26:47 Did Wiz Sell Too Early?

Records keep falling, Shah says: Wiz was the fastest-growing company and the largest tech acquisition of its time, and in the last six months he has seen enterprise AI companies sign $5 million to $15 million annual contracts in their first year. Fellow Wiz board member Gili Raanan thinks Wiz sold early, and Shah partly agrees. He sees security as a permanent category whose leaders will change, citing 7AI, co-invested with Greylock, as a chance to rebuild security on new foundations and merge budgets.

30:56 How Much Money Startups Need, and Concentration

Index writes checks from $1 million to more than $100 million out of seed, venture and growth funds. Rather than telling founders what to do, Shah asks Socratic questions about why they need the capital. He finds it counterintuitive that higher prices now help recruiting. He won’t spread money across a thousand small checks he couldn’t support, keeps 30 to 35 companies per venture fund, and warns that concentration hurts when markets turn.

37:13 Exits, Returns and the Shadow Investment Committee

IPOs can’t be timed, but M&A has accelerated, including Wiz, Cursor and World Labs deals and private-to-private mergers. The hardest call is whether a founder with an attractive offer should sell. O’Shea cites Bloomberg’s figures: an 11x DPI on the 2012 fund and 5.1x on a $780 million 2015 growth fund. Shah prefers to point to three decades of top-decile consistency. He closes by naming his wife, who has known him since middle school, as the person who can tell when his conviction is real.

Notable Quotes

“If I could define three patterns, then I could put thousands of entrepreneurs through a filter and make decisions and I could play statistics at scale. Right? For some people that’s like really fun and exciting. To me that’s not a craft.”
Shardul Shah, on pattern-matching in venture

“So prices are high. Fact. Prices will get higher. That’s a fact.”
Shardul Shah, on startup valuations

“We found at Index, one of our sins of omission is being cute on price.”
Shardul Shah, on the deals Index missed

“We systematically underestimate the size and magnitude of category defining companies.”
Shardul Shah, on Index’s recurring mistake

“Would I prefer a parachute with like loose stitched fabric together or one clean sheet that has the latest and greatest material science at play?”
Shardul Shah, on security platforms versus stitched-together tools

“What’s happening in the world today is like a luxury product effect where a higher price implies scarcity and so there’s actually more demand.”
Shardul Shah, on why high valuations help startups recruit

“She knows exactly when I’m high conviction and when I’m not. And that is the shadow investment committee of Index.”
Shardul Shah, on his wife

Watch the full interview here.