# Investors based in Boston (2026 list) > 949 investors based in Boston, 10% active in the last 12 months. Led by MassChallenge, Battery Ventures, Polaris Partners. Ranked by what they funded. Source: https://millionrounds.com/lists/investors-based-in-boston (Millionrounds; every figure on the page links to its filing or article) [Investor Lists](https://millionrounds.com/lists) # Investors based in Boston Updated 7 November 2026 Firms with an address in Boston. A head office is a fact about the firm; where it invests is on its own page. [See all 949 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Finvestors-based-in-boston)The top 25 **949** investors on the list No change this week **735** cheques in 12 months *+5%* against the market **$16M** median round they joined *+94%* against the market median **10%** wrote a cheque in 12 months **8%** have led a round ## The Top 25 Ordered by cheques observed, never by anything anyone paid for Deploying now (19) - 1 [MassChallenge](https://millionrounds.com/fund/masschallenge) *Deploying now* Accelerator · United States **984** **$1.8M** median round **Sept 2026** last seen - 2 [Battery Ventures](https://millionrounds.com/fund/battery-ventures) *Deploying now* VC firm · United States **658** **$32M** median round **Nov 2026** last seen - 3 [Polaris Partners](https://millionrounds.com/fund/polaris-partners) *Deploying now* VC firm · United States **490** **$36M** median round **Oct 2026** last seen - 4 [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) *Deploying now* Private equity · United States **395** **$93M** median round **Nov 2026** last seen - 5 [Summit Partners](https://millionrounds.com/fund/summit-partners) *Deploying now* Private equity · United States **356** **$81M** median round **Oct 2026** last seen - 6 [Wellington Management](https://millionrounds.com/fund/wellington-management) *Deploying now* VC firm · United States **297** **$130M** median round **Oct 2026** last seen - 7 [Cormorant Asset Management](https://millionrounds.com/fund/cormorant-asset-management) *Deploying now* Private equity · United States **176** **$102M** median round **Oct 2026** last seen - 8 [Globespan Capital Partners](https://millionrounds.com/fund/globespan-capital-partners) quiet VC firm · United States **156** **$43M** median round **Jul 2025** last seen - 9 [MPM Capital](https://millionrounds.com/fund/mpm-bioimpact) *Deploying now* Private equity · United States **139** **$60M** median round **Dec 2025** last seen - 10 [406 Ventures](https://millionrounds.com/fund/406-ventures) *Deploying now* VC firm · United States **136** **$15M** median round **Oct 2026** last seen - 11 [Omega Funds](https://millionrounds.com/fund/omega-funds) *Deploying now* VC firm · United States **104** **$88M** median round **Sept 2026** last seen - 12 [Flare Capital](https://millionrounds.com/fund/flare-capital-partners) *Deploying now* VC firm · United States **93** **$12M** median round **Oct 2026** last seen - 13 [HarbourVest Partners](https://millionrounds.com/fund/harbourvest-partners) *Deploying now* Fund of funds · United States **93** **$54M** median round **Jun 2026** last seen - 14 [RockPort Capital](https://millionrounds.com/fund/rockport-capital) quiet VC firm · United States **90** **$24M** median round **Jul 2019** last seen - 15 [MassMutual Ventures](https://millionrounds.com/fund/massmutual-ventures) *Deploying now* VC firm · United States **84** **$14M** median round **Oct 2026** last seen - 16 [Third Rock Ventures](https://millionrounds.com/fund/third-rock-ventures) quiet VC firm · United States **84** **$56M** median round **Jul 2019** last seen - 17 [Pillar VC](https://millionrounds.com/fund/pillar-vc) *Deploying now* VC firm · United States **83** **$8.2M** median round **Sept 2026** last seen - 18 [Castle Island Ventures](https://millionrounds.com/fund/castle-island-ventures) *Deploying now* VC firm · United States **78** **$7M** median round **Oct 2026** last seen - 19 [Fidelity Ventures](https://millionrounds.com/fund/fidelity-ventures) quiet VC firm · United States **75** **$310M** median round **Feb 2019** last seen - 20 [The E14 Fund](https://millionrounds.com/fund/e14-fund) *Deploying now* VC firm · United States **72** **$8M** median round **Oct 2026** last seen - 21 [Commonwealth Capital Ventures](https://millionrounds.com/fund/commonwealth-capital) quiet VC firm · United States **71** **$10M** median round **Sept 2015** last seen - 22 [One Way Ventures](https://millionrounds.com/fund/one-way-ventures) *Deploying now* VC firm · United States **71** **$8M** median round **Nov 2026** last seen - 23 [PSG](https://millionrounds.com/fund/providence-equity-partners) *Deploying now* VC firm · United States **68** **$50M** median round **Aug 2026** last seen - 24 [Ascent Venture Partners](https://millionrounds.com/fund/ascent-venture-partners) quiet VC firm · United States **65** **$8M** median round **Jul 2019** last seen - 25 [Underscore VC](https://millionrounds.com/fund/underscore-vc) *Deploying now* VC firm · United States **65** **$7M** median round **Sept 2026** last seen **924 more on this list** All 949 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%2Finvestors-based-in-boston) ## The Newest Cheques Rounds this list's investors joined most recently - **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) - **4** Nov **[Shackleton AI](https://millionrounds.com/company/shackleton-ai)** Seed · $5M *Led by* [Battery Ventures](https://millionrounds.com/fund/battery-ventures) - **4** Nov **[Lazarus AI](https://millionrounds.com/company/lazarus-ai)** $43M *With* [One Way Ventures](https://millionrounds.com/fund/one-way-ventures) - **3** Nov **[Traversal](https://millionrounds.com/company/traversal)** Series B · $120M *With* [Battery Ventures](https://millionrounds.com/fund/battery-ventures) - **3** Nov **[Applied Compute](https://millionrounds.com/company/applied-compute)** Other · $350M *With* [HubSpot Ventures](https://millionrounds.com/fund/hubspot-ventures) - **2** Nov **[Ozlo](https://millionrounds.com/company/ozlo)** Series B · $22M *With* [Drive by DraftKings](https://millionrounds.com/fund/drive-by-draftkings) ## Stages This Year 663 rounds - Other **17%** - Series A **15%** - Venture **13%** - Series B **13%** - Seed **12%** - Other **31%** ## What They Backed Sectors, last 12 months - AI **220** - Biotech **152** - Healthcare **77** - Pharma **56** - Fintech **34** - Big Data & Analytics **33** ## Cheques by Quarter Led Joined 187 Q1 25 162 Q2 25 172 Q3 25 233 Q4 25 235 Q1 26 186 Q2 26 183 Q3 26 50 Q4 26 The last bar is the quarter still running. ## Lists Like This - [Investors based in London 4,496](https://millionrounds.com/lists/investors-based-in-london) - [Investors based in CA 3,746](https://millionrounds.com/lists/investors-based-in-ca) - [Investors based in NY 3,658](https://millionrounds.com/lists/investors-based-in-ny) - [Investors based in WA 2,473](https://millionrounds.com/lists/investors-based-in-wa) - [Investors based in San Francisco 2,377](https://millionrounds.com/lists/investors-based-in-san-francisco) - [Investors based in TX 2,250](https://millionrounds.com/lists/investors-based-in-tx) - [Investors based in Dubai 1,922](https://millionrounds.com/lists/investors-based-in-dubai) - [Investors based in Los Angeles 1,261](https://millionrounds.com/lists/investors-based-in-los-angeles) - [Investors based in Chicago 1,255](https://millionrounds.com/lists/investors-based-in-chicago) [All investor lists *→*](https://millionrounds.com/lists) ## Quick answers about investors based in Boston ### Who are the most active investors based in Boston? By cheques observed, the most active are MassChallenge, Battery Ventures, Polaris Partners, RA Capital Management and Summit Partners. ### How many investors based in Boston are there? 949 are on record. 10% made an investment in the last 12 months and 8% have led a round. ### Which stages do investors based in Boston back? Of the rounds with a named stage in the last 12 months, mostly Series A (23%) and Series B (19%). ### How big are the rounds investors based in Boston join? The typical (median) round among the leading investors here is $32M. ### Which sectors do investors based in Boston back most? In the last 12 months, mostly AI, Biotech and Healthcare. ### Which investors based in Boston lead the most rounds? Battery Ventures (29 led), RA Capital Management (15 led) and Wellington Management (15 led). ### What have investors based in Boston invested in recently? Recent rounds include Alethio Therapeutics (Series A, Nov 2026, with RA Capital Management), Shackleton AI (Seed, Nov 2026, with Battery Ventures) and Lazarus AI (Nov 2026, with One Way Ventures). ### How is this list of investors based in Boston ranked? By cheques observed, from the rounds and filings we watched, and never by anything anyone paid for. It is rebuilt every night. Built from the rounds we watched, refreshed every night. [How we count](https://millionrounds.com/methodology) · [Report a correction](https://millionrounds.com/corrections)