Letter AI | RoundOS

Weekly digest by email

Loading companies…

Letter AI | RoundOS

Weekly digest by email

Funding history

1 round · 1 with disclosed amounts

Announced	Round	Amount	Investors
Feb 24, 2026	Series B	$40M	Battery Ventures — Role not disclosedLightbank — Role not disclosedNorthwestern Mutual Future Ventures — Role not disclosedStage 2 Capital — Role not disclosedY Combinator (YC) — Role not disclosed

Investors

Battery VenturesSeries B LightbankSeries B Northwestern Mutual Future VenturesSeries B Stage 2 CapitalSeries B Y Combinator (YC)Series B

Coverage

Feb 24, 2026Letter AI · Series B

Similar companies

De¹Building a Financial World Model trained on live market execution dataUndisclosed · Strategic

OwnerProvides an AI-powered technology and marketing platform for local businesses$240M · Series D

Warpify RoboticsBuilds robot productivity infrastructure for deployment, leasing and RaaS modelsUndisclosed · Seed+

Sources