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Andreessen Horowitz (a16z)

Activity from announced rounds

Activity in this selectionOct 16, 2026 · Sep 17, 2026
Rounds participated in
8
Confirmed lead rounds
4
All roles disclosed
New companies
7
First participation on record · 1 follow-on
Funding in participating rounds
$1.7B
8 disclosed · full round size, not this investor’s share

By stage

Series B5
Seed1
Series A1
Series C+1

By primary sector

AI3
Fintech3
Cybersecurity1
Healthtech1

By country

United States8

Rounds

8 in this selection
TypeSafe AI

Developer infrastructure that turns unstructured inputs into typed decisions and probability scores for automated software workflows.

$870MSeries A
Lead
Arena

Arena evaluates AI models through comparisons and observations of how people use them in real tasks.

$200MSeries B
Participant
Vesta

A mortgage loan-origination system with AI agents that work on applications, underwriting and closing documents.

$30MSeries B
Participant
Preference Model

Reinforcement-learning environments that help AI labs train models to solve tasks without exploiting flaws in the grading system.

$16MSeed
Lead
Stuut

AI software for finance teams that follows up on invoices, resolves payment disputes and matches incoming payments to receivables.

$52.5MSeries B
Participant
General Medicine

An online healthcare store where people compare care options and upfront prices, book visits and order medications or lab tests.

$120MSeries B
Lead
Valon

Mortgage-servicing software that combines loan records, accounting, operational workflows and AI agents in one platform.

$150MSeries D
Participant
Armadin

Armadin develops AI agents that test attack paths across enterprise systems and show defenders how connected weaknesses could be exploited.

$255.5MSeries B
Lead