# Series B cybersecurity investors (2026 list)

> 254 series B cybersecurity investors, 94% active in the last 12 months. Led by Y Combinator, Sequoia Capital, Andreessen Horowitz. Ranked by what they funded.

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

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

# Series B cybersecurity investors

Updated 7 November 2026

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

[See all 254 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fseries-b-cybersecurity-investors)The top 25

**254** investors on the list *+1* this week

**8,042** cheques in 12 months *-4%* against the market

**$22M** median round they joined *+181%* against the market median

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

**71%** 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 [Sequoia Capital](https://millionrounds.com/fund/sequoia-capital) *Deploying now* VC firm · United States **2,099** **$35M** median round **Nov 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 [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
- 5 [Plug and Play](https://millionrounds.com/fund/plug-and-play) *Deploying now* Accelerator · United States **1,561** **$5M** median round **Nov 2026** last seen
- 6 [General Catalyst](https://millionrounds.com/fund/general-catalyst) *Deploying now* VC firm · United States **1,387** **$27M** median round **Nov 2026** last seen
- 7 [SV Angel](https://millionrounds.com/fund/sv-angel) *Deploying now* VC firm · United States **1,349** **$18M** median round **Oct 2026** last seen
- 8 [Accel](https://millionrounds.com/fund/accel) *Deploying now* VC firm · United States **1,341** **$32M** median round **Nov 2026** last seen
- 9 [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
- 10 [Bpifrance](https://millionrounds.com/fund/bpifrance) *Deploying now* Government · France **1,151** **$4.5M** median round **Oct 2026** last seen
- 11 [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) *Deploying now* VC firm · United States **1,128** **$26M** median round **Nov 2026** last seen
- 12 [Intel Capital](https://millionrounds.com/fund/intel-capital) *Deploying now* Corporate VC · United States **1,123** **$22M** median round **Oct 2026** last seen
- 13 [Founders Fund](https://millionrounds.com/fund/founders-fund) *Deploying now* VC firm · United States **1,122** **$15M** median round **Oct 2026** last seen
- 14 [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
- 15 [Index Ventures](https://millionrounds.com/fund/index-ventures) *Deploying now* VC firm · United Kingdom **1,027** **$31M** median round **Nov 2026** last seen
- 16 [Gaingels](https://millionrounds.com/fund/gaingels) *Deploying now* Private equity · United States **1,010** **$8M** median round **Oct 2026** last seen
- 17 [Google Ventures](https://millionrounds.com/fund/gv) *Deploying now* Corporate VC · United States **884** **$38M** median round **Oct 2026** last seen
- 18 [Kima Ventures](https://millionrounds.com/fund/kima-ventures) *Deploying now* VC firm · France **859** **$4.2M** median round **Nov 2026** last seen
- 19 [Google for Startups](https://millionrounds.com/fund/google-for-startups) *Deploying now* Accelerator · United States **811** **$1.4M** median round **Sept 2026** last seen
- 20 [BoxGroup](https://millionrounds.com/fund/boxgroup) *Deploying now* VC firm · United States **773** **$18M** median round **Nov 2026** last seen
- 21 [Tiger Global Management](https://millionrounds.com/fund/tiger-global-management) *Deploying now* VC firm · United States **773** **$47M** median round **Nov 2026** last seen
- 22 [Insight Partners](https://millionrounds.com/fund/insight-venture-partners) *Deploying now* VC firm · United States **765** **$40M** median round **Oct 2026** last seen
- 23 [Redpoint](https://millionrounds.com/fund/redpoint) *Deploying now* VC firm · United States **742** **$32M** median round **Nov 2026** last seen
- 24 [Menlo Ventures](https://millionrounds.com/fund/menlo-ventures) *Deploying now* VC firm · United States **740** **$37M** median round **Oct 2026** last seen
- 25 [Battery Ventures](https://millionrounds.com/fund/battery-ventures) *Deploying now* VC firm · United States **658** **$32M** median round **Nov 2026** last seen

**229 more on this list**

All 254 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-cybersecurity-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 **[Physicl](https://millionrounds.com/company/physicl)** Seed · $10M *Led by* [Inovia Capital](https://millionrounds.com/fund/inovia-capital)
- **6** Nov **[Ocient](https://millionrounds.com/company/ocient)** Series C · $100M *With* [In-Q-Tel](https://millionrounds.com/fund/iqt)
- **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 **[T-Therapeutics](https://millionrounds.com/company/t-therapeutics)** Series B · $133M *With* [Tengxun Touzi](https://millionrounds.com/fund/tengxun-touzi)

## Stages This Year

4,520 rounds

- Seed **19%**
- Venture **19%**
- Series A **18%**
- Series B **9%**
- Pre-seed **9%**
- Other **25%**

## What They Backed

Sectors, last 12 months

- AI **2,132**
- Fintech **331**
- Big Data & Analytics **266**
- Healthcare **250**
- Biotech **214**
- Cybersecurity **189**

## Cheques by Quarter

Led Joined

2,074 Q1 25

2,194 Q2 25

2,330 Q3 25

2,466 Q4 25

2,467 Q1 26

2,184 Q2 26

1,862 Q3 26

566 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 security

- Hackers: Heroes of the Computer Revolution Steven Levy · 1984 4.16 from 8,649 ratings on Goodreads Security About the book A mere fifteen years ago, computer nerds were seen as marginal weirdos, outsiders whose world would never resonate with the mainstream. That was before one pioneering work documented the underground computer revolution that was about to change our world forever. With… On AmazonListen on Audible
- Smartcuts: How Hackers, Innovators, and Icons Accelerate Success Shane Snow · 2014 3.88 from 6,577 ratings on Goodreads Security Company building Innovation About the book Entrepreneur and journalist Shane Snow (Wired, Fast Company, The New Yorker, and cofounder of Contently) analyzes the lives of people and companies that do incredible things in implausibly short time. How do some startups go from zero to billions in mere months? How did… On AmazonListen on Audible
- The Innovators: How a Group of Hackers, Geniuses and Geeks Created the Digital Revolution Walter Isaacson · 2014 4.12 from 40,532 ratings on Goodreads Security Innovation Company building About the book Following his blockbuster biography of Steve Jobs, The Innovators is Walter Isaacson’s revealing story of the people who created the computer and the Internet. It is destined to be the standard history of the digital revolution and an indispensable guide to how innovation really… On AmazonListen on Audible
- Public Parts: How Sharing in the Digital Age Improves the Way We Work and Live [Jeff Jarvis](https://millionrounds.com/person/jeff-jarvis) · 2011 3.78 from 1,280 ratings on Goodreads Security Company building About the book International bestselling author and optimistic internet thinker Jeff Jarvis examines the way the Internet has changed the way we form communities, create identities, engage in commerce, and live our lives. A visionary and optimistic thinker examines the tension between privacy… On AmazonListen on Audible

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

As an Amazon Associate we earn from qualifying purchases.

## Quick answers about series B cybersecurity investors

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

By cheques observed, the most active are Y Combinator, Sequoia Capital, Andreessen Horowitz, Alumni Ventures and Plug and Play.

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

254 are on record. 94% made an investment in the last 12 months and 71% have led a round.

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

Of the rounds with a named stage in the last 12 months, mostly Seed (26%) and Series A (25%).

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

The typical (median) round among the leading investors here is $27M.

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

In the last 12 months, mostly AI, Fintech and Big Data & Analytics.

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

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

### Where are series B cybersecurity investors based?

Most of the leading investors here are based in the United States (22 of the top 25); the rest in France and the United Kingdom.

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

Recent rounds include Vensum Power (Series A, Nov 2026, with Lifeline Ventures), Physicl (Seed, Nov 2026, with Inovia Capital) and Ocient (Series C, Nov 2026, with In-Q-Tel).

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