# River AI raises $1.1B Series A led by General Catalyst

> River AI, based in United States, has raised $1.1B in a Series A led by General Catalyst and AMP PBC, announced on 17 August 2026. 3 other investors joined.

Source: https://millionrounds.com/news/rounds/river-ai-series-a-2026-08 (Millionrounds; every figure on the page links to its filing or article)

Raised **$1.1B** 4 sources reported it

Stage **Series A** first round on record

Investors **5** 2 named as lead

Where **US** United States

AI Developer Tools

## How big is it?

Against every equity round we recorded in the twelve months to 17 August 2026. Ranks count companies, so the same raise reported twice is counted once.

**#43** equity round of the last twelve months

**#2** Series A of 701 in that time

**#26** round in United States, of 1,096

This round **$1.1B**

Median Series A **$20M**

55 times the median Series A of the last twelve months.

## Who invested

- [**General Catalyst** 258 rounds in the last twelve months *Led*](https://millionrounds.com/fund/general-catalyst)
- [**AMP PBC** 2 rounds in the last twelve months *Led*](https://millionrounds.com/fund/amp-pbc)

Also in the round

- [Y Combinator](https://millionrounds.com/fund/y-combinator)
- [Temasek Holdings](https://millionrounds.com/fund/temasek)
- [AMD Ventures](https://millionrounds.com/fund/amd-ventures)

## Funding history

- August 2026 Series A **$1.1B**

This is the first round we hold for the company.

## Reported by

- TechCrunch 11 August
- TechStartups 11 August
- Ventureburn 11 August
- AlleyWatch 17 August

The round's figures come from these reports; each link opens the original.

## Other big rounds that week

[**Starcloud** $250M Series A](https://millionrounds.com/news/rounds/starcloud-series-a-2026-08)[**Castelion** $800M Series C](https://millionrounds.com/news/rounds/castelion-series-c-2026-08)[**Muon Space** $250M Series C](https://millionrounds.com/news/rounds/muon-space-series-c-2026-08)[**Callosum** $100M Seed](https://millionrounds.com/news/rounds/callosum-seed-round-2026-08)[**Groq** $350M Series A](https://millionrounds.com/news/rounds/groq-series-a-2026-08)[**Also** $150M Series D](https://millionrounds.com/news/rounds/also-series-d-2026-08)

[The company **River AI on Millionrounds** *→*](https://millionrounds.com/company/river-ai)[Weekly roundup **Week of 17 August** *→*](https://millionrounds.com/news/weekly/2026-08-17)[Monthly roundup **August 2026** *→*](https://millionrounds.com/news/monthly/2026-08)

**How this article is made**

We write one for every equity round of $100M or more that at least two sources reported. It is put together from our record of rounds, not rewritten from the reports: the ranks and medians count every equity round we read in the twelve months to the round's date. [How we read rounds](https://millionrounds.com/methodology) · [Report a mistake](https://millionrounds.com/corrections)