Sarah Guo
Founder, Conviction
Became Greylock’s youngest-ever general partner, then committed an entire fund to AI before it was consensus.
Sarah Guo began her career as a technology investment banker at Goldman Sachs before joining Greylock Partners in 2013, becoming the firm’s youngest general partner at 28.
She left Greylock in 2022 to found Conviction, an early-stage fund backing "Software 3.0" AI-native companies, with early bets including Figma, Harvey and Mistral. She co-hosts the AI podcast No Priors.
Conviction closed a $230M second fund in 2025, more than double its $101M debut, and added former Sequoia and Meta partner Mike Vernal as a general partner alongside it.
How she invests
The fund launched in 2022 with an AI-only mandate — before ChatGPT made that mandate obvious, and at a point when a single-theme fund was harder to raise than a generalist one. Doubling the fund size at the second close is the market’s verdict on the first three years. The structural risk of a single-thesis fund is unchanged by that success: there is no adjacent category to rotate into if the thesis stops working, only the choice to keep deploying or to stop.
What an individual investor can take from it
The instructive part is the timing rather than the conviction. Being early to a thesis only pays if you can deploy capital while it is still cheap; by the time a category is obviously good, the returns have already been allocated to whoever was positioned before the consensus formed. For an individual that argues for deciding what you believe before it is comfortable to say out loud — and for sizing those positions on the assumption that most of them will be wrong, because most of them will be.
Where the lesson stops
Surviving a wrong single-thesis bet requires capital and a career that can absorb it. A fund manager whose theme fails raises a smaller next fund; an individual who concentrates a portfolio into one thesis that fails may simply have lost the money. Being early is only a strategy if being early and wrong is survivable, and for most personal balance sheets that means diversifying across theses even when one feels obviously right.
Greylock’s youngest-ever general partner, at age 28.
Sources
- TechCrunch — Conviction adds Mike Vernal as GP, raises $230M fund ↗
- Forbes — Sarah Guo bet everything on AI pre-ChatGPT ↗
Facts here reflect public reporting at time of writing — roles and fund affiliations change; verify current details directly with Conviction.