# Series B femtech investors (2026 list)

> 39 series B femtech investors, 90% active in the last 12 months. Led by Y Combinator, Alumni Ventures, General Catalyst. Ranked by what they funded.

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

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

# Series B femtech investors

Updated 7 November 2026

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

[See all 39 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fseries-b-femtech-investors)The top 25

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

**2,627** cheques in 12 months *-1%* against the market

**$27M** median round they joined *+238%* against the market median

**90%** wrote a cheque in 12 months

**59%** 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 [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
- 3 [General Catalyst](https://millionrounds.com/fund/general-catalyst) *Deploying now* VC firm · United States **1,387** **$27M** median round **Nov 2026** last seen
- 4 [Founders Fund](https://millionrounds.com/fund/founders-fund) *Deploying now* VC firm · United States **1,122** **$15M** median round **Oct 2026** last seen
- 5 [Index Ventures](https://millionrounds.com/fund/index-ventures) *Deploying now* VC firm · United Kingdom **1,027** **$31M** median round **Nov 2026** last seen
- 6 [Gaingels](https://millionrounds.com/fund/gaingels) *Deploying now* Private equity · United States **1,010** **$8M** median round **Oct 2026** last seen
- 7 [Google Ventures](https://millionrounds.com/fund/gv) *Deploying now* Corporate VC · United States **884** **$38M** median round **Oct 2026** last seen
- 8 [BoxGroup](https://millionrounds.com/fund/boxgroup) *Deploying now* VC firm · United States **773** **$18M** median round **Nov 2026** last seen
- 9 [Global Founders Capital](https://millionrounds.com/fund/global-founders-capital) *Deploying now* VC firm · Germany **461** **$7M** median round **Oct 2026** last seen
- 10 [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) *Deploying now* Private equity · United States **395** **$93M** median round **Nov 2026** last seen
- 11 [Abstract Ventures](https://millionrounds.com/fund/abstract) *Deploying now* VC firm · United States **295** **$13M** median round **Nov 2026** last seen
- 12 [Google](https://millionrounds.com/fund/google-assistant-investments) *Deploying now* Accelerator · United States **154** **$40M** median round **Nov 2026** last seen
- 13 [Invus](https://millionrounds.com/fund/invus) *Deploying now* Private equity · United States **148** **$81M** median round **Oct 2026** last seen
- 14 [5AM Ventures](https://millionrounds.com/fund/5am-ventures) *Deploying now* VC firm · United States **147** **$55M** median round **Oct 2026** last seen
- 15 [Industrifonden](https://millionrounds.com/fund/industrifonden) *Deploying now* VC firm · Sweden **140** **$5.8M** median round **Oct 2026** last seen
- 16 [Catalio Capital Management](https://millionrounds.com/fund/catalio-capital-management) *Deploying now* VC firm · United States **108** **$73M** median round **Oct 2026** last seen
- 17 [Left Lane Capital](https://millionrounds.com/fund/left-lane-capital) *Deploying now* VC firm · United States **102** **$25M** median round **Oct 2026** last seen
- 18 [MANTIS Venture Capital](https://millionrounds.com/fund/mantis-venture-capital) *Deploying now* VC firm · United States **90** **$20M** median round **Oct 2026** last seen
- 19 [Human Capital](https://millionrounds.com/fund/human-capital-2) *Deploying now* Growth equity · New Zealand **81** **$24M** median round **Oct 2026** last seen
- 20 [Innovestor](https://millionrounds.com/fund/innovestor) *Deploying now* Angel network · Finland **58** **$2.5M** median round **Oct 2026** last seen
- 21 [Rethink Impact](https://millionrounds.com/fund/rethink-impact) *Deploying now* VC firm · United States **44** **$15M** median round **Oct 2026** last seen
- 22 [Lumira Ventures](https://millionrounds.com/fund/lumira-ventures) *Deploying now* VC firm · Canada **43** **$37M** median round **Nov 2026** last seen
- 23 [Emerson Collective](https://millionrounds.com/fund/emerson-collective) *Deploying now* Family office · United States **27** **$62M** median round **Oct 2026** last seen
- 24 [Flywheel Ventures](https://millionrounds.com/fund/flywheel-ventures) *Deploying now* VC firm · United States **26** **$25M** median round **Sept 2026** last seen
- 25 [BBG Ventures](https://millionrounds.com/fund/bbg-ventures) *Deploying now* VC firm · United States **16** **$6.1M** median round **Sept 2026** last seen

**14 more on this list**

All 39 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-femtech-investors)

## The Newest Cheques

Rounds this list's investors joined most recently

- **5** Nov **[firmly](https://millionrounds.com/company/firmly)** Series A · $15M *With* [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund)
- **5** Nov **[Alethio Therapeutics](https://millionrounds.com/company/alethio-therapeutics)** Series A · $90M *Led by* [RA Capital Management](https://millionrounds.com/fund/ra-capital-management)
- **5** Nov **[RadianX](https://millionrounds.com/company/radianx)** Seed · $9M *With* [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund)
- **4** Nov **[Nooks](https://millionrounds.com/company/nooks)** Growth · $500M *Led by* [General Catalyst](https://millionrounds.com/fund/general-catalyst)
- **4** Nov **[Phaze Inc.](https://millionrounds.com/company/phaze-inc)** Seed · $8.8M *With* [Index Ventures](https://millionrounds.com/fund/index-ventures)
- **3** Nov **[Thryv Therapeutics](https://millionrounds.com/company/thryv-therapeutics)** Series B · $30M *With* [Lumira Ventures](https://millionrounds.com/fund/lumira-ventures)

## Stages This Year

2,189 rounds

- Venture **22%**
- Series A **17%**
- Seed **15%**
- Pre-seed **12%**
- Series B **9%**
- Other **24%**

## What They Backed

Sectors, last 12 months

- AI **1,033**
- Biotech **181**
- Fintech **141**
- Healthcare **127**
- Big Data & Analytics **109**
- Aerospace & Space **89**

## Cheques by Quarter

Led Joined

718 Q1 25

667 Q2 25

733 Q3 25

795 Q4 25

792 Q1 26

777 Q2 26

585 Q3 26

129 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 at Series B and scaling

- Blitzscaling: The Lightning-Fast Path to Building Massively Valuable Companies Reid Hoffman · 2018 3.95 from 7,118 ratings on Goodreads Scaling and operations Leading and managing Moats and competition About the book Foreword by Bill Gates LinkedIn cofounder, legendary investor, and host of the award-winning Masters of Scale podcast reveals the secret to starting and scaling massively valuable companies. What entrepreneur or founder doesn’t aspire to build the next Amazon, Facebook, or… On AmazonListen on Audible
- One Page Talent Management: Eliminating Complexity, Adding Value Marc Effron · 2010 4.00 from 311 ratings on Goodreads Leading and managing Hiring and culture Scaling and operations About the book A Revolutionary Approach to Talent Management You know that winning in today’s marketplace requires top quality talent. You also know what it takes to build that talent, and you spend significant financial and human resources to make it happen. Yet somehow, your company’s… On AmazonListen on Audible
- The Culture Code: The Secrets of Highly Successful Groups Daniel Coyle · 2017 4.24 from 37,412 ratings on Goodreads Hiring and culture Leading and managing About the book What do Pixar, Google and the San Antonio Spurs basketball team have in common?The answer is that they all owe their extraordinary success to their team-building skills. In The Culture Code, Daniel Coyle goes inside some of the most effective organisations in the world and… On AmazonListen on Audible
- Scaling Up: How a Few Companies Make It...and Why the Rest Don't Verne Harnish · 2014 4.16 from 6,229 ratings on Goodreads Scaling and operations Leading and managing About the book Winner of the 2015 International Book Awards for General Business Winner of the 2015 National Indie Excellence Award for General Business Winner of the 2015 Readers' Favorite International Book Award Gold Medal for Non-Fiction Business Winner of the 2015 Paris Book… On AmazonListen on Audible

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

As an Amazon Associate we earn from qualifying purchases.

## Quick answers about series B femtech investors

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

By cheques observed, the most active are Y Combinator, Alumni Ventures, General Catalyst, Founders Fund and Index Ventures.

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

39 are on record. 90% made an investment in the last 12 months and 59% have led a round.

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

Of the rounds with a named stage in the last 12 months, mostly Series A (24%) and Seed (22%).

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

The typical (median) round among the leading investors here is $24M.

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

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

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

General Catalyst (97 led), Index Ventures (62 led) and Founders Fund (42 led).

### Where are series B femtech investors based?

Among the most active, most are based in the United States (19), the United Kingdom (1) and Germany (1).

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

Recent rounds include firmly (Series A, Nov 2026, with Alumni Ventures), Alethio Therapeutics (Series A, Nov 2026, with RA Capital Management) and RadianX (Seed, Nov 2026, with Alumni Ventures).

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