# Series B developer Tools investors (2026 list)

> 142 series B developer Tools investors, 99% 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-developer-tools-investors (Millionrounds; every figure on the page links to its filing or article)

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

# Series B developer Tools investors

Updated 7 November 2026

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

[See all 142 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fseries-b-developer-tools-investors)The top 25

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

**5,597** cheques in 12 months *-1%* against the market

**$27M** median round they joined *+233%* against the market median

**99%** wrote a cheque in 12 months

**66%** 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 [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
- 5 [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
- 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 [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) *Deploying now* VC firm · United States **1,128** **$26M** median round **Nov 2026** last seen
- 11 [Intel Capital](https://millionrounds.com/fund/intel-capital) *Deploying now* Corporate VC · United States **1,123** **$22M** median round **Oct 2026** last seen
- 12 [Index Ventures](https://millionrounds.com/fund/index-ventures) *Deploying now* VC firm · United Kingdom **1,027** **$31M** median round **Nov 2026** last seen
- 13 [Google Ventures](https://millionrounds.com/fund/gv) *Deploying now* Corporate VC · United States **884** **$38M** median round **Oct 2026** last seen
- 14 [First Round Capital](https://millionrounds.com/fund/first-round-capital) *Deploying now* VC firm · United States **807** **$18M** median round **Oct 2026** last seen
- 15 [Insight Partners](https://millionrounds.com/fund/insight-venture-partners) *Deploying now* VC firm · United States **765** **$40M** median round **Oct 2026** last seen
- 16 [Redpoint](https://millionrounds.com/fund/redpoint) *Deploying now* VC firm · United States **742** **$32M** median round **Nov 2026** last seen
- 17 [Menlo Ventures](https://millionrounds.com/fund/menlo-ventures) *Deploying now* VC firm · United States **740** **$37M** median round **Oct 2026** last seen
- 18 [Bossa Invest](https://millionrounds.com/fund/bossa-invest) *Deploying now* VC firm · Brazil **657** **$6.7M** median round **Oct 2026** last seen
- 19 [Salesforce Ventures](https://millionrounds.com/fund/salesforce-ventures) *Deploying now* Corporate VC · United States **649** **$26M** median round **Nov 2026** last seen
- 20 [CRV](https://millionrounds.com/fund/crv) *Deploying now* VC firm · United States **588** **$20M** median round **Oct 2026** last seen
- 21 [Benchmark](https://millionrounds.com/fund/benchmark) *Deploying now* VC firm · United States **587** **$30M** median round **Oct 2026** last seen
- 22 [Citibank](https://millionrounds.com/fund/citi) *Deploying now* Growth equity · United States **566** **$20M** median round **Oct 2026** last seen
- 23 [Flybridge](https://millionrounds.com/fund/flybridge) *Deploying now* VC firm · United States **534** **$5M** median round **Sept 2026** last seen
- 24 [Bain Capital Ventures](https://millionrounds.com/fund/bain-capital-ventures) *Deploying now* VC firm · United States **524** **$27M** median round **Nov 2026** last seen
- 25 [8VC](https://millionrounds.com/fund/8vc) *Deploying now* VC firm · United States **497** **$23M** median round **Oct 2026** last seen

**117 more on this list**

All 142 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-developer-tools-investors)

## The Newest Cheques

Rounds this list's investors joined most recently

- **6** Nov **[Physicl](https://millionrounds.com/company/physicl)** Seed · $10M *Led by* [Inovia Capital](https://millionrounds.com/fund/inovia-capital)
- **6** Nov **[Future Secure AI](https://millionrounds.com/company/future-secure-ai)** Other · $80M *Led by* [Square Peg](https://millionrounds.com/fund/square-peg-2)
- **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 **[Potential Sciences](https://millionrounds.com/company/potential-sciences)** Seed *With* [Patrick Collison](https://millionrounds.com/fund/patrick-collison)
- **5** Nov **[Uranium Digital](https://millionrounds.com/company/uranium-digital)** Series A · $17M *Led by* [Blockchain Capital](https://millionrounds.com/fund/blockchain-capital)

## Stages This Year

3,542 rounds

- Venture **19%**
- Series A **18%**
- Seed **18%**
- Series B **10%**
- Pre-seed **9%**
- Other **26%**

## What They Backed

Sectors, last 12 months

- AI **1,776**
- Fintech **254**
- Big Data & Analytics **205**
- Healthcare **190**
- Biotech **155**
- Financial Services **150**

## Cheques by Quarter

Led Joined

1,385 Q1 25

1,480 Q2 25

1,577 Q3 25

1,722 Q4 25

1,701 Q1 26

1,567 Q2 26

1,258 Q3 26

397 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 developer tools and open source

- Dreaming in Code: Two Dozen Programmers, Three Years, 4,732 Bugs, and One Quest for Transcendent Software Scott Rosenberg · 2007 3.71 from 3,101 ratings on Goodreads Developer tools and open source About the book Their story takes us through a maze of dead ends and exhilarating breakthroughs as they and their colleagues wrestle not only with the abstraction of code but with the unpredictability of human behavior, especially their own. Along the way, we encounter black holes, turtles,… On AmazonListen on Audible
- Implementing Domain-Driven Design Vernon Vaughn · 2013 4.05 from 1,292 ratings on Goodreads Developer tools and open source About the book “For software developers of all experience levels looking to improve their results, and design and implement domain-driven enterprise applications consistently with the best current state of professional practice, Implementing Domain-Driven Design will impart a treasure trove of… On AmazonListen on Audible
- Practices of an Agile Developer Venkat Subramaniam · 2006 3.88 from 1,001 ratings on Goodreads Developer tools and open source About the book Want to be a better developer? This books collects the personal habits, ideas, and approaches of successful agile software developers and presents them in a series of short, easy-to-digest tips. This isn't academic fluff; follow these ideas and you'll show yourself, your… On AmazonListen on Audible
- The Art of Agile Development: Pragmatic Guide to Agile Software Development James Shore · 2007 3.98 from 918 ratings on Goodreads Developer tools and open source About the book The Art of Agile Development contains practical guidance for anyone considering or applying agile development for building valuable software. Plenty of books describe what agile development is or why it helps software projects succeed, but very few combine information for… On AmazonListen on Audible

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

As an Amazon Associate we earn from qualifying purchases.

## Quick answers about series B developer Tools investors

### Who are the most active series B developer Tools investors?

By cheques observed, the most active are Y Combinator, Sequoia Capital, Andreessen Horowitz, New Enterprise Associates and Alumni Ventures.

### How many series B developer Tools investors are there?

142 are on record. 99% made an investment in the last 12 months and 66% have led a round.

### Which stages do series B developer Tools investors back?

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

### How big are the rounds series B developer Tools investors join?

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

### Which sectors do series B developer Tools investors back most?

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

### Which series B developer Tools investors lead the most rounds?

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

### Where are series B developer Tools investors based?

Most of the leading investors here are based in the United States (23 of the top 25); the rest in the United Kingdom and Brazil.

### What have series B developer Tools investors invested in recently?

Recent rounds include Physicl (Seed, Nov 2026, with Inovia Capital), Future Secure AI (Other, Nov 2026, with Square Peg) 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)