# Series B AI investors (2026 list)

> 1,557 series B AI investors, 94% active in the last 12 months. Led by Y Combinator, Techstars, 500 Global. Ranked by what they funded.

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

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

# Series B AI investors

Updated 7 November 2026

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

[See all 1,557 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fseries-b-ai-investors)The top 25

**1,557** investors on the list No change this week

**20,590** cheques in 12 months *-5%* against the market

**$27M** median round they joined *+241%* against the market median

**94%** wrote a cheque in 12 months

**52%** have led a round

## The Top 25

Ordered by cheques observed, never by anything anyone paid for

Deploying now (25)

- 1 [Y Combinator](https://millionrounds.com/fund/y-combinator) *Deploying now* Accelerator · United States **6,412** **$3M** median round **Oct 2026** last seen
- 2 [Techstars](https://millionrounds.com/fund/techstars) *Deploying now* VC firm · United States **2,989** **$1.2M** median round **Nov 2026** last seen
- 3 [500 Global](https://millionrounds.com/fund/500-startups) *Deploying now* Angel · United States **2,140** **$3.6M** median round **Oct 2026** last seen
- 4 [Sequoia Capital](https://millionrounds.com/fund/sequoia-capital) *Deploying now* VC firm · United States **2,099** **$35M** median round **Nov 2026** last seen
- 5 [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
- 6 [Andreessen Horowitz](https://millionrounds.com/fund/andreessen-horowitz) *Deploying now* VC firm · United States **1,661** **$27M** median round **Nov 2026** last seen
- 7 [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) *Deploying now* VC firm · United States **1,610** **$34M** median round **Oct 2026** last seen
- 8 [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund) *Deploying now* VC firm · United States **1,598** **$12M** median round **Nov 2026** last seen
- 9 [Plug and Play](https://millionrounds.com/fund/plug-and-play) *Deploying now* Accelerator · United States **1,561** **$5M** median round **Nov 2026** last seen
- 10 [General Catalyst](https://millionrounds.com/fund/general-catalyst) *Deploying now* VC firm · United States **1,387** **$27M** median round **Nov 2026** last seen
- 11 [SV Angel](https://millionrounds.com/fund/sv-angel) *Deploying now* VC firm · United States **1,349** **$18M** median round **Oct 2026** last seen
- 12 [Accel](https://millionrounds.com/fund/accel) *Deploying now* VC firm · United States **1,341** **$32M** median round **Nov 2026** last seen
- 13 [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
- 14 [Wayra](https://millionrounds.com/fund/wayra) *Deploying now* Corporate VC · Germany **1,160** **$2M** median round **Sept 2026** last seen
- 15 [Bpifrance](https://millionrounds.com/fund/bpifrance) *Deploying now* Government · France **1,151** **$4.5M** median round **Oct 2026** last seen
- 16 [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) *Deploying now* VC firm · United States **1,128** **$26M** median round **Nov 2026** last seen
- 17 [Intel Capital](https://millionrounds.com/fund/intel-capital) *Deploying now* Corporate VC · United States **1,123** **$22M** median round **Oct 2026** last seen
- 18 [Founders Fund](https://millionrounds.com/fund/founders-fund) *Deploying now* VC firm · United States **1,122** **$15M** median round **Oct 2026** last seen
- 19 [Bessemer Venture Partners](https://millionrounds.com/fund/bessemer-venture-partners) *Deploying now* VC firm · United States **1,038** **$30M** median round **Nov 2026** last seen
- 20 [Index Ventures](https://millionrounds.com/fund/index-ventures) *Deploying now* VC firm · United Kingdom **1,027** **$31M** median round **Nov 2026** last seen
- 21 [Gaingels](https://millionrounds.com/fund/gaingels) *Deploying now* Private equity · United States **1,010** **$8M** median round **Oct 2026** last seen
- 22 [SOSV](https://millionrounds.com/fund/sosv) *Deploying now* VC firm · United States **951** **$2.5M** median round **Nov 2026** last seen
- 23 [Google Ventures](https://millionrounds.com/fund/gv) *Deploying now* Corporate VC · United States **884** **$38M** median round **Oct 2026** last seen
- 24 [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) *Deploying now* Government · European Union **875** **$4.3M** median round **Oct 2026** last seen
- 25 [Kima Ventures](https://millionrounds.com/fund/kima-ventures) *Deploying now* VC firm · France **859** **$4.2M** median round **Nov 2026** last seen

**1,532 more on this list**

All 1,557 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-ai-investors)

## The Newest Cheques

Rounds this list's investors joined most recently

- **7** Nov **[LionBio Therapeutics](https://millionrounds.com/company/lionbio-therapeutics)** Pre-seed · $6M *With* [South Park Commons](https://millionrounds.com/fund/south-park-commons)
- **6** Nov **[aSand.ai](https://millionrounds.com/company/asand-ai)** Series A · $200M *Led by* [Wangsu Science & Technology](https://millionrounds.com/fund/wangsu-science-and-technology)
- **6** Nov **[URobotics](https://millionrounds.com/company/urobotics)** Series A · $30M *Led by* [Kiwoom Investment](https://millionrounds.com/fund/kiwoom-investment)
- **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 **[Physicl](https://millionrounds.com/company/physicl)** Seed · $10M *Led by* [Inovia Capital](https://millionrounds.com/fund/inovia-capital)
- **6** Nov **[Shield AI](https://millionrounds.com/company/shield-ai)** $2B *Led by* [Disruptive](https://millionrounds.com/fund/disruptive)

## Stages This Year

8,583 rounds

- Seed **21%**
- Venture **20%**
- Series A **17%**
- Pre-seed **9%**
- Series B **8%**
- Other **26%**

## What They Backed

Sectors, last 12 months

- AI **3,259**
- Biotech **650**
- Healthcare **548**
- Fintech **509**
- Big Data & Analytics **419**
- Energy **336**

## Cheques by Quarter

Led Joined

5,432 Q1 25

5,662 Q2 25

5,988 Q3 25

6,464 Q4 25

6,491 Q1 26

5,446 Q2 26

4,680 Q3 26

1,499 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)
- [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)
- [Seed big Data & Analytics investors 583](https://millionrounds.com/lists/seed-big-data-investors)

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

## Reading for founders in AI and data

- Genius Makers: The Mavericks Who Brought AI to Google, Facebook, and the World Cade Metz · 2021 4.26 from 3,395 ratings on Goodreads AI and data Company building About the book "This colorful page-turner puts artificial intelligence into a human perspective. Through the lives of Geoff Hinton and other major players, Metz explains this transformative technology and makes the quest thrilling." Walter Isaacson, author of The Code Breaker Recipient of… On AmazonListen on Audible
- Rewired: The McKinsey Guide to Outcompeting in the Age of Digital and AI Eric Lamarre · 2023 3.87 from 490 ratings on Goodreads AI and data Company building About the book In Rewired, the world's most influential management consulting firm, McKinsey & Company, delivers a road-tested, how-to manual their own consultants use to help companies build the capabilities to outcompete in the age of digital and AI. Many companies are stuck with digital… On AmazonListen on Audible
- Blood in the Machine: The Origins of the Rebellion Against Big Tech Brian Merchant · 2023 4.19 from 2,069 ratings on Goodreads AI and data Company building About the book Longlisted for the Financial Times Business Book of the Year The "rich and gripping" true story of the first time machines came for human jobs, and how the Luddite uprising explains the power, threat, and toll of big tech and AI today (Naomi Klein) The most urgent story in… On AmazonListen on Audible
- The Industries of the Future Alec J. Ross · 2016 3.96 from 8,471 ratings on Goodreads AI and data Company building About the book This book answers the question: 'What's next?' The Internet had a world-changing impact on businesses and the global community over the twenty years from 1994 to 2014. In the next ten years, change will happen even faster. As Hillary Clinton's Senior Advisor for Innovation,… On AmazonListen on Audible

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

As an Amazon Associate we earn from qualifying purchases.

## Quick answers about series B AI investors

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

By cheques observed, the most active are Y Combinator, Techstars, 500 Global, Sequoia Capital and National Science Foundation.

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

1,557 are on record. 94% made an investment in the last 12 months and 52% have led a round.

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

Of the rounds with a named stage in the last 12 months, mostly Seed (29%) and Series A (23%).

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

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

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

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

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

Andreessen Horowitz (114 led), Accel (103 led) and General Catalyst (97 led).

### Where are series B AI investors based?

Most of the leading investors here are based in the United States (20 of the top 25); the rest in France and Germany.

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

Recent rounds include LionBio Therapeutics (Pre-seed, Nov 2026, with South Park Commons), aSand.ai (Series A, Nov 2026, with Wangsu Science & Technology) and URobotics (Series A, Nov 2026, with Kiwoom Investment).

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