645 Ventures

Activity from announced rounds

Activity in this selectionOct 18, 2026 · Jul 21, 2026

645 Ventures is an investment firm whose partners include Aaron Holiday and Nnamdi Okike. Its AI infrastructure and developer-tools coverage identifies Gimlet Labs, while its own communications connect the firm to Ellis.

Recorded funding activity

The recorded activity includes Gimlet’s Series B for a compiler and cloud platform that distribute AI inference across processor types. Seed financings for Ellis, Fish Audio and General Analysis cover private-credit operations, voice generation and security for AI agents. These examples describe announcements covered by RoundOS rather than the firm’s complete portfolio.

Sources
Rounds participated in
4
Confirmed lead rounds
0
3 roles undisclosed
New companies
4
First participation on record · 0 follow-on
Funding in participating rounds
$364.7M
4 disclosed · full round size, not this investor’s share

By stage

Seed3
Series B1

By primary sector

AI2
Fintech2

By country

United States4

Rounds

4 in this selection
Gimlet Labs

Provides a cloud inference platform and compiler that distribute AI workloads across different processor types.

$300MSeries B
Participant
Rivo

Automatically moves idle cash into higher-yield accounts and back before bills are due

$2.7MSeed
Role not disclosed
Ellis

AI-native operations platform for private credit

$10MSeed
Role not disclosed
Fish Audio

AI voice platform for expressive real-time text-to-speech, voice cloning, and voice agents

$52MSeed
Role not disclosed