Y Combinator (YC)

Activity from announced rounds

Activity in this selectionSeries B

Y Combinator funds early-stage startups through a three-month accelerator in San Francisco, with four batches a year and a standard $500,000 investment for accepted companies.

The investment consists of $125,000 for 7% of the company and $375,000 on an uncapped SAFE with a most-favoured-nation provision. The second SAFE adds to YC’s ownership when it converts, so the full $500,000 is not exchanged for a fixed 7% stake.

During the batch, founders work with YC partners in individual and group office hours, build toward Demo Day and use the alumni community for feedback, hiring and introductions. Companies can apply before launch; YC also accepts businesses that already have users and revenue.

Sources
Rounds participated in
19
Confirmed lead rounds
0
15 roles undisclosed
New companies
19
First participation on record · 0 follow-on
Funding in participating rounds
$921M
19 disclosed · full round size, not this investor’s share

By stage

Series B19

By primary sector

AI5
Developer tools4
Healthtech4
Fintech3
Ecommerce1
2 more
Enterprise software1
Robotics1

By country

United States18
United Kingdom1

Rounds

19 in this selection
Greptile

Greptile builds an AI code-review and validation platform that checks software changes against the context of a team’s codebase.

$50MSeries B
Participant
Nous Research

Open-source AI models and the Hermes agent, which retains project memory and reusable skills across tasks.

$90MSeries B
Participant
Firecrawl

A web-data API that turns websites into structured data for developers building AI applications and agents.

$75MSeries B
Participant
Confido

Confido connects accounting, finance, sales and operations data so consumer brands can manage deductions, trade spending and supply plans together.

$55MSeries B
Participant
Arintra

AI platform automating medical coding and revenue assurance for health systems

$25MSeries B
Role not disclosed
Blacksmith

Cloud infrastructure for building and testing software through continuous integration workflows.

$45MSeries B
Role not disclosed
Bunkerhill Health

Bunkerhill Health builds an agentic AI platform for health systems to turn their ideas into reality

$25MSeries B
Role not disclosed
Ollama

Ollama provides tools for developers to use open AI models.

$65MSeries B
Role not disclosed
Fleek

Develops AI infrastructure for secondhand clothing industry

$25MSeries B
Role not disclosed
Triomics

Building AI infrastructure to turn complex cancer records into structured intelligence

$22MSeries B
Role not disclosed
Luminai

Luminai provides AI-based automation software for healthcare operations.

$38MSeries B
Role not disclosed
Lucid Bots

Lucid Bots develops autonomous exterior-cleaning robots and software for professional cleaning businesses.

$20MSeries B
Role not disclosed
Spade

Data and AI platform transforming how financial institutions use transaction data

$40MSeries B
Role not disclosed
Gumloop

Provides AI-powered automation tools for non-technical employees to build and deploy autonomous agents

$50MSeries B
Role not disclosed
Juicebox

Develops AI recruiting software for finding and contacting candidates before they apply.

$80MSeries B
Role not disclosed
Letter AI

Provides AI-native revenue enablement platform for go-to-market teams

$40MSeries B
Role not disclosed
Onshore

Builds AI-powered platform to help businesses claim and defend tax incentives like R&D credits with automation and expert review

$31MSeries B
Role not disclosed
Bretton AI

Provides AI agents for financial crime operations in regulated financial institutions

$75MSeries B
Role not disclosed
Emergent

Provides AI software creation platform for building full-stack web and mobile applications

$70MSeries B
Role not disclosed