# Series B social Media investors (2026 list)

> 22 series B social Media investors, 100% active in the last 12 months. Led by Alumni Ventures, Accel, Lightspeed Venture Partners. Ranked by what they funded.

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

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

# Series B social Media investors

Updated 7 November 2026

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

[See all 22 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fseries-b-social-media-investors)The top 22

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

**887** cheques in 12 months *+2%* against the market

**$34M** median round they joined *+320%* against the market median

**100%** wrote a cheque in 12 months

**50%** have led a round

## The Top 22

Ordered by cheques observed, never by anything anyone paid for

Deploying now (22)

- 1 [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
- 2 [Accel](https://millionrounds.com/fund/accel) *Deploying now* VC firm · United States **1,341** **$32M** median round **Nov 2026** last seen
- 3 [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
- 4 [Index Ventures](https://millionrounds.com/fund/index-ventures) *Deploying now* VC firm · United Kingdom **1,027** **$31M** median round **Nov 2026** last seen
- 5 [True Ventures](https://millionrounds.com/fund/true-ventures-2) *Deploying now* VC firm · Netherlands **397** **$8.7M** median round **Oct 2026** last seen
- 6 [Endeavor Catalyst](https://millionrounds.com/fund/endeavor-catalyst) *Deploying now* Corporate VC · United States **318** **$30M** median round **Oct 2026** last seen
- 7 [Bloomberg Beta](https://millionrounds.com/fund/bloomberg-beta) *Deploying now* VC firm · United States **206** **$8M** median round **Sept 2026** last seen
- 8 [Innovation Endeavors](https://millionrounds.com/fund/innovation-endeavors) *Deploying now* VC firm · United States **178** **$18M** median round **Oct 2026** last seen
- 9 [Blockchain Capital](https://millionrounds.com/fund/blockchain-capital) *Deploying now* VC firm · United States **130** **$15M** median round **Nov 2026** last seen
- 10 [Protocol Labs](https://millionrounds.com/fund/protocol-labs) *Deploying now* Corporate VC · United States **87** **$4.3M** median round **Apr 2026** last seen
- 11 [Knight Foundation](https://millionrounds.com/fund/knight-foundation) *Deploying now* VC firm · United States **35** **$100M** median round **Mar 2026** last seen
- 12 [True.](https://millionrounds.com/fund/true) *Deploying now* VC firm · United Kingdom **30** **$20M** median round **Mar 2026** last seen
- 13 [Stewart Butterfield](https://millionrounds.com/fund/stewart-butterfield) *Deploying now* Angel **15** **$35M** median round **Oct 2026** last seen
- 14 [Anthos Capital](https://millionrounds.com/fund/anthos-capital) *Deploying now* VC firm · United States **13** **$27M** median round **Apr 2026** last seen
- 15 [Bain Capital Crypto](https://millionrounds.com/fund/bain-capital-crypto) *Deploying now* Corporate VC · United States **8** **$51M** median round **Oct 2026** last seen
- 16 [Camber Partners](https://millionrounds.com/fund/camber-partners) *Deploying now* Private equity · United States **1** **$63M** median round **Jun 2026** last seen
- 17 [Thomas Dimson](https://millionrounds.com/fund/thomas-dimson) *Deploying now* Growth equity **1** **$35M** median round **Oct 2026** last seen
- 18 [Zenith Capital](https://millionrounds.com/fund/zenith-capital-2) *Deploying now* Private equity · United Kingdom **1** **$35M** median round **Oct 2026** last seen
- 19 [Andy Zhong](https://millionrounds.com/fund/andy-zhong) *Deploying now* Growth equity **1** **$35M** median round **Oct 2026** last seen
- 20 [Bayshore](https://millionrounds.com/fund/bayshore) *Deploying now* Private equity · United States **1** **$35M** median round **Oct 2026** last seen
- 21 [the Nintendo Family Office](https://millionrounds.com/fund/the-nintendo-family-office) *Deploying now* Growth equity **1** **$35M** median round **Oct 2026** last seen
- 22 [the ZeniMax Family](https://millionrounds.com/fund/the-zenimax-family) *Deploying now* Growth equity **1** **$35M** median round **Oct 2026** last seen

## The Newest Cheques

Rounds this list's investors joined most recently

- **6** Nov **[Thinking Machines Lab](https://millionrounds.com/company/thinking-machines-lab)** Other · $5B *Led by* [Accel](https://millionrounds.com/fund/accel)
- **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 **[Uranium Digital](https://millionrounds.com/company/uranium-digital)** Series A · $17M *Led by* [Blockchain Capital](https://millionrounds.com/fund/blockchain-capital)
- **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 **[Phaze Inc.](https://millionrounds.com/company/phaze-inc)** Seed · $8.8M *With* [Index Ventures](https://millionrounds.com/fund/index-ventures)
- **3** Nov **[PowerUp Money](https://millionrounds.com/company/powerup-money)** Other · $10M *With* [Accel](https://millionrounds.com/fund/accel)

## Stages This Year

821 rounds

- Series A **20%**
- Seed **16%**
- Venture **15%**
- Series B **14%**
- Series C **9%**
- Other **27%**

## What They Backed

Sectors, last 12 months

- AI **416**
- Fintech **77**
- Cybersecurity **43**
- Healthcare **41**
- Biotech **39**
- Software **39**

## Cheques by Quarter

Led Joined

230 Q1 25

225 Q2 25

221 Q3 25

249 Q4 25

278 Q1 26

226 Q2 26

223 Q3 26

75 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 media, entertainment and games

- Convergence Culture: Where Old and New Media Collide Henry Jenkins · 2006 3.86 from 3,860 ratings on Goodreads Media, entertainment and games About the book Convergence Culture maps a new territory: where old and new media intersect, where grassroots and corporate media collide, where the power of the media producer and the power of the consumer interact in unpredictable ways. Henry Jenkins, one of America's most respected media… On AmazonListen on Audible
- Ripped: How the Wired Generation Revolutionized Music Greg Kot · 2009 3.75 from 755 ratings on Goodreads Media, entertainment and games Company building About the book A decade ago the vast majority of mainstream music was funneled through a handful of media conglomerates. Now, more people are listening to more music from a greater variety of sources than at any time in history. And big corporations such as Viacom, Clear Channel, and Sony are… On AmazonListen on Audible
- The Chaos Machine: The Inside Story of How Social Media Rewired Our Minds and Our World Max Fisher · 2022 4.26 from 9,592 ratings on Goodreads Media, entertainment and games About the book From a New York Times investigative reporter and Pulitzer Prize finalist, “an essential book for our times” (Ezra Klein), tracking the high-stakes inside story of how Big Tech’s breakneck race to drive engagement, and profits, at all costs fractured the world We all have a… On AmazonListen on Audible
- The Creator's Code The Six Essential Skills of Extraordinary Entrepreneurs Amy Wilkinson · 2014 3.76 from 813 ratings on Goodreads Media, entertainment and games Company building About the book Each of us has the capacity to spot opportunities, invent products, and build businesses, even $100 million businesses. How do some people turn ideas into enterprises that endure? Why do some people succeed when so many others fail? The Creator’s Code unlocks the six essential… On AmazonListen on Audible

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

As an Amazon Associate we earn from qualifying purchases.

## Quick answers about series B social Media investors

### Who are the most active series B social Media investors?

By cheques observed, the most active are Alumni Ventures, Accel, Lightspeed Venture Partners, Index Ventures and True Ventures.

### How many series B social Media investors are there?

22 are on record. 100% made an investment in the last 12 months and 50% have led a round.

### Which stages do series B social Media investors back?

Of the rounds with a named stage in the last 12 months, mostly Series A (26%) and Seed (22%).

### How big are the rounds series B social Media investors join?

The typical (median) round among the leading investors here is $35M.

### Which sectors do series B social Media investors back most?

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

### Which series B social Media investors lead the most rounds?

Accel (103 led), Lightspeed Venture Partners (83 led) and Index Ventures (62 led).

### Where are series B social Media investors based?

Among the most active, most are based in the United States (13), the United Kingdom (3) and the Netherlands (1).

### What have series B social Media investors invested in recently?

Recent rounds include Thinking Machines Lab (Other, Nov 2026, with Accel), firmly (Series A, Nov 2026, with Alumni Ventures) and Uranium Digital (Series A, Nov 2026, with Blockchain Capital).

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