# Series B cleantech investors (2026 list)

> 139 series B cleantech investors, 85% active in the last 12 months. Led by Techstars, National Science Foundation, Andreessen Horowitz.

Source: https://millionrounds.com/lists/series-b-cleantech-investors (Millionrounds; every figure on the page links to its filing or article)

[Investor Lists](https://millionrounds.com/lists)

# Series B cleantech investors

Updated 7 November 2026

Firms we have watched take part in a Series B round raised by a cleantech company in the last two years. Both the stage and the sector are what they did, not what their website says.

[See all 139 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fseries-b-cleantech-investors)The top 25

**139** investors on the list No change this week

**2,887** cheques in 12 months *-13%* against the market

**$24M** median round they joined *+202%* against the market median

**85%** wrote a cheque in 12 months

**57%** have led a round

## The Top 25

Ordered by cheques observed, never by anything anyone paid for

Deploying now (25)

- 1 [Techstars](https://millionrounds.com/fund/techstars) *Deploying now* VC firm · United States **2,989** **$1.2M** median round **Nov 2026** last seen
- 2 [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) *Deploying now* Government · United States **1,869** **$926K** median round **Sept 2026** last seen
- 3 [Andreessen Horowitz](https://millionrounds.com/fund/andreessen-horowitz) *Deploying now* VC firm · United States **1,661** **$27M** median round **Nov 2026** last seen
- 4 [Accel](https://millionrounds.com/fund/accel) *Deploying now* VC firm · United States **1,341** **$32M** median round **Nov 2026** last seen
- 5 [Lightspeed Venture Partners](https://millionrounds.com/fund/lightspeed-venture-partners) *Deploying now* VC firm · United States **1,341** **$35M** median round **Nov 2026** last seen
- 6 [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) *Deploying now* VC firm · United States **1,128** **$26M** median round **Nov 2026** last seen
- 7 [SOSV](https://millionrounds.com/fund/sosv) *Deploying now* VC firm · United States **951** **$2.5M** median round **Nov 2026** last seen
- 8 [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) *Deploying now* Government · European Union **875** **$4.3M** median round **Oct 2026** last seen
- 9 [Right Side Capital Management](https://millionrounds.com/fund/right-side-capital-management) *Deploying now* VC firm · United States **834** **$875K** median round **Sept 2026** last seen
- 10 [Tiger Global Management](https://millionrounds.com/fund/tiger-global-management) *Deploying now* VC firm · United States **773** **$47M** median round **Nov 2026** last seen
- 11 [Global Founders Capital](https://millionrounds.com/fund/global-founders-capital) *Deploying now* VC firm · Germany **461** **$7M** median round **Oct 2026** last seen
- 12 [US Department of Energy](https://millionrounds.com/fund/u-s-department-of-energy) *Deploying now* Government · United States **453** **$2M** median round **Sept 2026** last seen
- 13 [Lerer Hippeau](https://millionrounds.com/fund/lerer-hippeau) *Deploying now* VC firm · United States **419** **$9.7M** median round **Nov 2026** last seen
- 14 [Union Square Ventures](https://millionrounds.com/fund/union-square-ventures) *Deploying now* VC firm · United States **407** **$17M** median round **Nov 2026** last seen
- 15 [Coatue](https://millionrounds.com/fund/coatue-management) *Deploying now* VC firm · United States **404** **$85M** median round **Oct 2026** last seen
- 16 [Temasek Holdings](https://millionrounds.com/fund/temasek) *Deploying now* VC firm · Singapore **384** **$100M** median round **Oct 2026** last seen
- 17 [Balderton Capital](https://millionrounds.com/fund/balderton-capital) *Deploying now* VC firm · United Kingdom **368** **$30M** median round **Oct 2026** last seen
- 18 [Endeavor Catalyst](https://millionrounds.com/fund/endeavor-catalyst) *Deploying now* Corporate VC · United States **318** **$30M** median round **Oct 2026** last seen
- 19 [Quiet Capital](https://millionrounds.com/fund/quiet-capital) *Deploying now* VC firm · United States **283** **$17M** median round **Oct 2026** last seen
- 20 [Valor Equity Partners](https://millionrounds.com/fund/valor-equity-partners) *Deploying now* VC firm · United States **261** **$50M** median round **Nov 2026** last seen
- 21 [CDP Venture Capital](https://millionrounds.com/fund/cdp-venture-capital) *Deploying now* VC firm · Italy **227** **$3.9M** median round **Oct 2026** last seen
- 22 [Alven](https://millionrounds.com/fund/alven) *Deploying now* VC firm · France **192** **$15M** median round **Nov 2026** last seen
- 23 [Cherry Ventures](https://millionrounds.com/fund/cherry-ventures) *Deploying now* VC firm · Germany **179** **$13M** median round **Oct 2026** last seen
- 24 [Bayern Kapital](https://millionrounds.com/fund/bayern-kapital) *Deploying now* Government · Germany **173** **$7.1M** median round **Oct 2026** last seen
- 25 [360 Capital](https://millionrounds.com/fund/360-capital) *Deploying now* VC firm · France **167** **$7.8M** median round **Nov 2026** last seen

**114 more on this list**

All 139 are in the app, with filters for stage, sector and market. A free account shows 10 per search, Pro up to 1,000.

[See the whole list *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fseries-b-cleantech-investors)

## The Newest Cheques

Rounds this list's investors joined most recently

- **6** Nov **[Vensum Power](https://millionrounds.com/company/vensum-power)** Series A · $10M *Led by* [Lifeline Ventures](https://millionrounds.com/fund/lifeline-ventures)
- **6** Nov **[Humble Robotics](https://millionrounds.com/company/humble-robotics)** Series A · $51M *With* [Energy Impact Partners](https://millionrounds.com/fund/energy-impact-partners)
- **6** Nov **[Thinking Machines Lab](https://millionrounds.com/company/thinking-machines-lab)** Other · $5B *Led by* [Accel](https://millionrounds.com/fund/accel)
- **6** Nov **[Harbinger](https://millionrounds.com/company/harbinger)** Series D+ · $240M *Led by* [Tiger Global Management](https://millionrounds.com/fund/tiger-global-management)
- **5** Nov **[Nyquis](https://millionrounds.com/company/nyquis)** Seed · $6.3M *Led by* [Gigascale Capital](https://millionrounds.com/fund/gigascale-capital)
- **5** Nov **[Mindmax](https://millionrounds.com/company/mindmax)** Seed · $3.3M *With* [Lerer Hippeau](https://millionrounds.com/fund/lerer-hippeau)

## Stages This Year

2,276 rounds

- Venture **18%**
- Series A **18%**
- Seed **17%**
- Series B **10%**
- Series C **6%**
- Other **31%**

## What They Backed

Sectors, last 12 months

- AI **872**
- Biotech **154**
- Energy **149**
- Fintech **145**
- Healthcare **143**
- Big Data & Analytics **114**

## Cheques by Quarter

Led Joined

857 Q1 25

824 Q2 25

931 Q3 25

918 Q4 25

887 Q1 26

731 Q2 26

732 Q3 26

215 Q4 26

The last bar is the quarter still running.

## Lists Like This

- [Seed AI investors 2,922](https://millionrounds.com/lists/seed-ai-investors)
- [Series A AI investors 2,490](https://millionrounds.com/lists/series-a-ai-investors)
- [Series B AI investors 1,557](https://millionrounds.com/lists/series-b-ai-investors)
- [Pre-seed AI investors 1,286](https://millionrounds.com/lists/pre-seed-ai-investors)
- [Growth AI investors 1,186](https://millionrounds.com/lists/growth-ai-investors)
- [Series A fintech investors 950](https://millionrounds.com/lists/series-a-fintech-investors)
- [Series C AI investors 930](https://millionrounds.com/lists/series-c-ai-investors)
- [Seed fintech investors 925](https://millionrounds.com/lists/seed-fintech-investors)
- [Series A biotech investors 650](https://millionrounds.com/lists/series-a-biotech-investors)

[All investor lists *→*](https://millionrounds.com/lists)

## Reading for founders in climate and energy

- Taming the Sun: Innovations to Harness Solar Energy and Power the Planet Varun Sivaram · 2018 4.06 from 510 ratings on Goodreads Climate and energy Innovation About the book How solar could spark a clean-energy transition through transformative innovation--creative financing, revolutionary technologies, and flexible energy systems. Solar energy, once a niche application for a limited market, has become the cheapest and fastest-growing power… On AmazonListen on Audible
- The Elements of Power: Gadgets, Guns, and the Struggle for a Sustainable Future in the Rare Metal Age David S. Abraham · 2015 4.06 from 264 ratings on Goodreads Climate and energy Company building About the book Our future hinges on a set of rare metals that few of us have even heard of. In this eye-opening book, a natural resource strategist reveals the critical importance of these transformative elements to our technological lifestyle and the consequences of our reliance upon them,… On AmazonListen on Audible
- Scale: The Universal Laws of Growth, Innovation, Sustainability, and the Pace of Life in Organisms, Cities, Economies, and Companies Geoffrey B. West · 2017 4.11 from 5,764 ratings on Goodreads Climate and energy Company building Innovation About the book The former head of the Sante Fe Institute, visionary physicist Geoffrey West is a pioneer in the field of complexity science, the science of emergent systems and networks. The term “complexity” can be misleading, however, because what makes West’s discoveries so beautiful is… On AmazonListen on Audible
- Energy: A Beginner's Guide Vaclav Smil · 2006 3.99 from 1,520 ratings on Goodreads Climate and energy About the book As Einstein pointed out in his famous equation, E=MC2, all matter can be described as energy. It is everywhere; it is everything. In this engaging book, prolific author and academic Vaclav Smil provides an introduction to the far-reaching term and gives the reader a greater… On AmazonListen on Audible

More books for founders and investors on the [Reading List](https://millionrounds.com/reading-list?role=founder&industry=climate&stage=scaling).

As an Amazon Associate we earn from qualifying purchases.

## Quick answers about series B cleantech investors

### Who are the most active series B cleantech investors?

By cheques observed, the most active are Techstars, National Science Foundation, Andreessen Horowitz, Accel and Lightspeed Venture Partners.

### How many series B cleantech investors are there?

139 are on record. 85% made an investment in the last 12 months and 57% have led a round.

### Which stages do series B cleantech investors back?

Of the rounds with a named stage in the last 12 months, mostly Series A (24%) and Seed (23%).

### How big are the rounds series B cleantech investors join?

The typical (median) round among the leading investors here is $15M.

### Which sectors do series B cleantech investors back most?

In the last 12 months, mostly AI, Biotech and Energy.

### Which series B cleantech investors lead the most rounds?

Andreessen Horowitz (114 led), Accel (103 led) and Lightspeed Venture Partners (83 led).

### Where are series B cleantech investors based?

Among the most active, most are based in the United States (16), Germany (3) and France (2).

### What have series B cleantech investors invested in recently?

Recent rounds include Vensum Power (Series A, Nov 2026, with Lifeline Ventures), Humble Robotics (Series A, Nov 2026, with Energy Impact Partners) and Thinking Machines Lab (Other, Nov 2026, with Accel).

Built from the rounds we watched, refreshed every night. [How we count](https://millionrounds.com/methodology) · [Report a correction](https://millionrounds.com/corrections)