# Rainmaker raises $100M Series B

> Rainmaker, based in United States, has raised $100M in a Series B, announced on 21 September 2026. 7 other investors joined.

Source: https://millionrounds.com/news/rounds/rainmaker-series-b-2026-09 (Millionrounds; every figure on the page links to its filing or article)

Raised **$100M** 3 sources reported it

Stage **Series B** 2 earlier rounds on record

Investors **7** no lead named

Where **US** United States

Climate Tech Water

## How big is it?

Against every equity round we recorded in the twelve months to 21 September 2026. Ranks count companies, so the same raise reported twice is counted once.

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

**#89** Series B of 393 in that time

**#286** round in United States, of 1,129

This round **$100M**

Median Series B **$50M**

2.0 times the median Series B of the last twelve months.

## Who invested

In the round

- [DCVC](https://millionrounds.com/fund/data-collective)
- [Lowercarbon Capital](https://millionrounds.com/fund/lowercarbon-capital)
- [Long Journey Ventures](https://millionrounds.com/fund/long-journey-ventures)
- [M Ventures](https://millionrounds.com/fund/m-ventures)
- [Upfront Ventures](https://millionrounds.com/fund/upfront-ventures)
- [Noa](https://millionrounds.com/fund/noa)
- [Dream Ventures](https://millionrounds.com/fund/dream-ventures)

## Funding history

- September 2026 Series B **$100M**
- May 2025 Series A **$25M**
- April 2023 Pre-seed **$500K**

$126M raised across the 3 rounds we hold.

## Reported by

- TechStartups 21 September
- Ventureburn 21 September
- AlleyWatch 27 September

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

## Other big rounds that week

[**Island** $400M Series F](https://millionrounds.com/news/rounds/island-series-f-2026-09)[**Basecamp Research** $140M Series C](https://millionrounds.com/news/rounds/basecamp-research-series-c-2026-09)[V **Verda** $189M Series B](https://millionrounds.com/news/rounds/verda-series-b-2026-09)[**Angle Health** $600M Series C](https://millionrounds.com/news/rounds/angle-health-series-c-2026-09)

[The company **Rainmaker on Millionrounds** *→*](https://millionrounds.com/company/rainmaker)[Weekly roundup **Week of 21 September** *→*](https://millionrounds.com/news/weekly/2026-09-21)[Monthly roundup **September 2026** *→*](https://millionrounds.com/news/monthly/2026-09)

**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)