645 Ventures

Activity from announced rounds

Activity in this selectionUnited States · Oct 26, 2026 · Jul 29, 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
3
Confirmed lead rounds
0
2 roles undisclosed
New companies
3
First participation on record · 0 follow-on
Funding in participating rounds
$312.7M
3 disclosed · full round size, not this investor’s share

By stage

Seed2
Series B1

By primary sector

Fintech2
AI1

By country

United States3

Rounds

3 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