Lambert Fund · Palo Alto, California
We invest only in Silicon Valley's top AI companies.
AI will reorganize the economy around a few companies. Lambert Fund is a concentrated private investment fund in Palo Alto, built to own meaningful stakes in those companies — and hold them.
Lambert is built on hard questions.
Six questions we ask of every company before price is ever discussed. Only once all six are answered does valuation enter the conversation.
Our approach →On time
Patience is the only edge that compounds.
We invest on a horizon measured in decades, in a handful of companies that will still be here when the noise is gone.
“All the returns in life, whether in wealth, relationships, or knowledge, come from compound interest.”
Naval Ravikant · How to Get Rich, 2018“The beginning is the most important part of the work.”
Plato · The Republic“If everything you do needs to work on a three-year time horizon, then you're competing against a lot of people. But if you're willing to invest on a seven-year time horizon, you're now competing against a fraction of those people.”
Jeff Bezos · Wired, 2011The firm
A small fund with a narrow mandate.
The fund exists to do one thing: own meaningful stakes in the few AI companies that will still matter in ten years, and hold them.
Lambert Fund was founded in 2026 in Palo Alto by a General Partner who has backed Silicon Valley's frontier AI companies across successive rounds — and who continues to invest his own capital in every position the fund takes.
We do not run a broad portfolio. We do not chase themes. We do not invest outside Silicon Valley.
Approach
Few companies. Large positions. Long holds.
Concentration is not a risk we tolerate. It is the strategy.
Concentration over coverage
A handful of companies rather than a hundred. We would rather own more of the right company than a little of everything, and we size positions accordingly.
The leader, not the alternative
In every category we back the company that is already ahead. We do not fund the second-best at a discount, and we do not invest outside the Valley, whatever the price.
Bought to hold
We follow our companies round after round and hold through the IPO and beyond. Our time horizon is the company's, not the fund cycle's.
Access, not just capital
The best companies rarely raise in public. We reach them through direct allocations, long relationships with the venture firms that lead their rounds, and secondary purchases from early shareholders.
Where we look
Three layers of the AI economy.
The models, the substrate beneath them, and the machines they will run.
The modelsFrontier labs
The laboratories building the most capable models in the world and becoming the default interface between people, organizations and intelligence. The core of the portfolio.
The substrateAI infrastructure
The compute, cloud and systems companies that every lab depends on and every application pays for — the layer that gets paid whoever wins the model race.
The machinesPhysical AI & deep tech
Humanoid robotics, launch, and the frontier of hard science. Where a category leader is still emerging, we take an early position and follow the winner.
Portfolio
More than thirty AI‑native companies.
Backed by our General Partner personally and through affiliated vehicles, ahead of the fund. A selection:
A representative selection, not a complete list. Company names are used for identification only and do not imply endorsement. Past investments are not indicative of future results.
Perspectives
“Don't ask whether AI is a bubble. Ask whether you are.”Our General Partner, 2026
Our General Partner's writing on the AI economy makes three arguments: value in this cycle accrues to a very small number of companies; the application layer is structurally fragile; and Silicon Valley sees the future before anyone else does. The questions that writing asks of the industry are the questions we ask of every company before we invest.
Community
We convene the people we invest in.
For four consecutive years our team has hosted one of San Francisco's largest AI conferences, one or two editions a year, with more than 10,000 attendees and speakers from OpenAI, Google DeepMind, NVIDIA and Microsoft. It is where we meet founders and researchers long before a round is announced.
Founders
If you are building the leader in your category in Silicon Valley, we would like to know you early — before you raise.
Investors
Lambert Fund works with a small group of families and institutions. Qualified investors may request information.
Palo Alto, California 94301