Y Combinator (YC)

Activity from announced rounds

Activity in this selectionPre-seed

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
9
Confirmed lead rounds
2
2 roles undisclosed
New companies
9
First participation on record · 0 follow-on
Funding in participating rounds
$15.8M
5 disclosed · full round size, not this investor’s share

By stage

Pre-seed9

By primary sector

Developer tools4
Enterprise software3
Proptech1
Robotics1

By country

United States6
France1
India1
Poland1

Rounds

9 in this selection
ByteAsk

ByteAsk develops AI coding agents for engineers working on C and C++ software in demanding industrial and technical environments.

$1MPre-seed
Lead
StarSling

Fast GitHub Actions runners paired with AI agents that optimize continuous integration workflows.

UndisclosedPre-Seed
Participant
TesterArmy

AI agents that automate software testing and help teams improve application quality.

€1MPre-Seed
Lead
Kalinda

Kalinda uses AI to help plaintiff-side class action and mass tort firms review case information and qualify potential claims.

$500KPre-Seed
Participant
MorphoAI

Foundation models for understanding, designing and controlling hardware and physical systems.

UndisclosedPre-Seed
Participant
Lemma

Lemma monitors AI agents in production and surfaces semantic failures that ordinary system metrics can miss.

$2.3MPre-Seed
Participant
RealPact

AI agents that gather property records, prepare real estate contracts and track transactions to closing.

UndisclosedPre-Seed
Participant
Upstream

Upstream is a collaborative inbox where people and AI agents organize messages and coordinate work across shared email conversations.

$3MPre-Seed
Role not disclosed
Moritz

Combines AI with lawyers to deliver commercial legal services with same-day turnaround

$9MPre-Seed
Role not disclosed