What does Y Combinator invest in?
Y Combinator invests most often at Seed and Pre-seed (61% of the rounds on record), in sectors such as Startups.

United States · Investor
Last cheque observed Oct 2026; 6410 cheques on record.
Deploying nowAccelerator
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1,051 cheques in the last 12 months
Mostly Seed and Pre-seed: 61% of its rounds
Sole investor in 1,835 rounds, median $500K
117 exits from the portfolio
Four times a year we invest in a large number of startups.From their own website
Every round we can evidence, newest first6,410 appearances
823 rounds
An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.
Named by the firm itself, on a filing, its Form ADV or its company registration4 named
We also hold 58 people at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.
From the firm's own filings with the SEC, which it must file accurately by law
From their own portfolio page (on their website)
PaulgrahamStartup SchoolTectonicdefenseTheinformation
Weaker than a round we watched, stronger than a list somebody sold us. A firm is far less willing to put a company on its own site that it never funded.
Companies it backed that were later bought or listed117 in all
The latest 20 here. An exit counts when it came after the firm's first round in the company. From historical deal records.
The investors most often in the same rounds as Y Combinator. A count of rooms they were both in, not a relationship either has claimed.
The latest companies Y Combinator put money into.
One book written by people at Y Combinator: Jessica Livingston.

Founders at Work: Stories of Startups' Early Days
Jessica Livingston · 2001
4.04 from 39,701 ratings on Goodreads
Founders at Work recounts the early struggles for independence and acceptance of many of modern technology’s giants, through personal interviews that are at times hilarious, at times painful, and always inspiring. As human-interest stories they will interest the same audience…
Find the books for what you are building, or how you invest.
Open the Reading ListAs an Amazon Associate we earn from qualifying purchases.
6 episodes naming Y Combinator in the title, and 4 more that mention it.

Why Y Combinator cut Canada out
MentionsY Combinator

Uncapped #7 | Garry Tan from Y Combinator
MentionsGarry TanY Combinator

Low T Levels at Y Combinator, Founder Burnout, Taylor Lorenz
MentionsY Combinator

Y Combinator sets its sights on D.C. with Luther Lowe
MentionsY Combinator

🧬 Quin Wills - Ochre Bio - Part 4 | Quin’s Journey Through Y Combinator | The Role of Empathy in Team Dynamics | Adapting in a Shifting Biotech Industry | Ochre Bio’s Fundraising Journey & Future Plans
MentionsY Combinator

20VC: Behind the Scenes at Y Combinator: The Interview Process | What the Best & Worst Do in the Program | Do the Best All Raise Pre-Demo Day & YC's Fundraising Advice to Startups | Why the Value is in Application Layer AI with Tom Blomfield
WithTom Blomfield
MentionsY Combinator

Justin Kan & Brian Chesky: The Rejections That Built Twitch and Airbnb | E2344

A rogue OpenAI agent hacked Australia’s government. Does this matter? | E2342

Robinhood's Sarah Pinto: Bringing Private Markets to the Public

YC Demo Day, Spoon = Bent (Again), iPhone Duo Reactions | Garry Tan, Om Buddhdev, Karen Serfaty, Antonio Li, Edward Ge, Alfredo Gonzalez
Y Combinator invests most often at Seed and Pre-seed (61% of the rounds on record), in sectors such as Startups.
6,410 investments on record, 1,051 of them in the last 12 months, and it led 11. The most recent was in Oct 2026.
Its most recent investments on record: Neuron Industries (Seed, Oct 2026), Reflex (Series A, Oct 2026) and Sava (Seed, Oct 2026).
The median round it joins is $3.0M. It says it writes cheques of $500K to $500K.
Sometimes: it led 11 of its 6,410 investments on record (0%).
Most of the companies it backs are in the United States (68%) and India (8%).
Yes: it is actively investing, with 1,051 investments in the last 12 months.
Most often Pioneer Fund (501 rounds together), Liquid 2 Ventures (331 rounds together) and Greycroft (307 rounds together).
Find the investors who back rounds like yours, and keep every conversation on one fundraising board.
Built from the rounds we watched, its filings and its own website, refreshed every night. How we count · Report a correction · Is this your firm? Claim it