| # | Company | Employees |
|---|---|---|
| 1 |
Flagship Pioneeringflagshippioneering.com
Innovative biotechnology company creating platform companies for transformative human health and sustainability products, with over 100 ventures in its ecosystem |
836 |
| 2 |
Highland Capital Partnershcp.com
venture capital firm investing over 3 billion dollars in more than 270 technology companies prioritizing entrepreneurs and innovation |
202 |
| 3 |
Atlas Ventureatlasventure.com
Building breakthrough biotech startups since 1993, translating high-impact science into medicines for patients through seed-led venture creation strategy, focusing on compelling opportunities. |
172 |
| 4 |
F-Primefprimecapital.com
A global venture capital firm rooted in entrepreneurship, backing groundbreaking companies in technology and life sciences with over $2 trillion in assets under management |
116 |
| 5 |
Dorm Room Funddormroomfund.com
Investment fund supporting student founders with mentorship and funding, helping them launch their entrepreneurial careers and build a strong community |
100 |
| 6 |
Oxbridge Groupoxbridgenetwork.com
A diversified group with operations in multiple countries, specializing in education, property development, venture capital, real estate, trading, and technology development |
72 |
| 7 |
CVPconverge.vc
Early-stage VC fund providing capital and connections for tech entrepreneurs in Cambridge, NYC, and Eastern Canada, focusing on software and cutting-edge technology ventures |
36 |
| 8 |
Taihill Venturetaihill.vc
A group of young leaders invest in disruptive startups, supporting entrepreneurs driving change with breakthrough technologies and global networks |
35 |
| 9 |
Link Ventureslinkventures.com
Early-stage tech investment firm focusing on data science, machine learning, and AI to help startups solve corporate and consumer needs with long-term support and industry expertise |
34 |
| 10 |
The Engineengine.xyz
An organization specializing in bridging the gap between discovery and commercialization for breakthrough inventions, with a focus on Tough Tech founders They aim to address challenging global issues |
31 |
| 11 |
Mission BioCapitalmissionbiocapital.com
Venture capital firm makes pivotal early-stage investments in biotech companies, providing lab space, capital, and strategic partners from idea to exit. |
27 |
| 12 |
Walnut Ventureswalnutventures.com
A group of experienced entrepreneurs and executives investing in and mentoring Boston-area seed and early stage technology-based companies |
17 |
| 13 |
IDEO CoLab Venturesideocolab.com
Partner with visionary founders using design expertise to create innovative products and protocols that resonate deeply with users. |
17 |
| 14 |
G20 Venturesg20vc.com
Capital partner supporting new businesses with strategic funding, storytelling, and networking to facilitate geometric growth and transform ideas into reality |
17 |
| 15 |
Accomplice VCaccomplice.co
Venture firm and family office focused on high conviction investments, founded by Jeff Fagnan and Ryan Moore Concentrated, patient investors |
16 |
| 16 |
Vestigo Venturesvestigoventures.com
An early-stage venture capital firm investing in technology startups focused on financial services, using big data expertise and financial industry insight for successful investments and growth |
16 |
| 17 |
Safar Partnerssafar.partners
A venture fund investing in technology companies originating from top universities, focusing on cleantech, AI/IT, robotics, and life science/medical devices |
16 |
| 18 |
milemark•capital
Early-stage venture capital firm investing in diverse teams utilizing applied AI to revolutionize traditional business models |
13 |
| 19 |
Converge VCconverge.vc
A Boston-based venture firm providing long-term capital to B2B tech entrepreneurs with a network of experienced tech executives |
12 |
| 20 | 10 | |
| 21 |
Project 11project11.com
Venture capital fund investing in early stage technology and software companies, working closely with founders to build their businesses and continue investing in later rounds |
10 |
| 22 |
Waterline Ventureswaterlineventures.com
Early stage healthcare technology and services investment firm focused on improving healthcare delivery through innovative solutions for payors, providers, pharma, and patients |
7 |
| 23 |
Fairhaven Capitalfairhavencapital.com
Active early-stage investors focused on high-potential companies in rapidly growing markets, with expertise in technology-based business models that drive market leadership |
7 |
| 24 |
Athenian Capitalathenian.capital
Venture capital fund investing in AI companies to democratize technology, headquartered in Boston with offices in New York and Silicon Valley |
6 |
| 25 |
KungHo Fundkungho.com
Early stage angel fund investing in AI technology start-ups in Edtech, eCommerce/Fintech and Healthcare sectors, operating as the US investment arm of Zino Ventures |
5 |
| 26 |
Koa Labskoalab.com
Startup fund in Harvard Square empowering mission-driven entrepreneurs to build independent companies and achieve their potential |
4 |
| 27 |
Boston Global Venturesbostonglobalventures.com
A venture capital firm investing in early-stage technology companies globally, working closely with founders to build market-leading organizations |
2 |
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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.
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