Venture capital firms in Connecticut
24 venture firms based in Connecticut filed a new fund, deal vehicle or board seat with the SEC in the last 12 months, 9 (38%) of them in the last 90 days. The most common sectors are Climate & Energy (3), AI & ML (2) and B2B Software (2). For the 17 with a stated or estimated check size, the median range is $200K–$600K. Many invest nationally, so also check the full list of venture firms.
Updated from SEC filings · How we build this list
Who are the most active venture firms in Connecticut?
By new SEC filings in the last 12 months, the most active are Positive Sum, Tamarack Global, Atlas, Kindred Capital and Hash3 Capital.
How many venture firms in Connecticut are investing right now?
24 filed a new fund, deal vehicle or board seat with the SEC in the last 12 months, 9 of them in the last 90 days.
How much do venture firms in Connecticut typically invest?
The median estimated check is $200K–$600K, across 17 investors with a plausible estimate. Actual checks vary by round and lead role.
What sectors do venture firms in Connecticut back most?
Climate & Energy (3), AI & ML (2) and B2B Software (2) lead, by investors with recent activity in each.
Start a 3-day trial to rank these 24 investors by fit with your startup and see contacts and warm paths.
Rank them for me- Active Aug 2026
Positive SumVC firm · Greenwich, CT
Seed, Series A · checks $1M–$3M (est.)
AI & MLCybersecurityB2B Software - Active Sep 2026
Tamarack GlobalVC firm · Greenwich, CT
Pre-seed, Seed · checks $400K–$1.2M (est.)
SpaceClimate & EnergyMobility & Logistics - Active Sep 2026
AtlasVC firm · Greenwich, CT
Pre-seed, Seed · checks $225K–$700K (est.)
Industrial & ManufacturingMedia, Gaming & CreatorClimate & Energy - Active Sep 2026
- Active May 2026
Hash3 CapitalVC firm · Ridgefield, CT
Pre-seed, Seed · checks $250K–$1M (est.)
Sector focus not yet verified - Active Jan 2026
6th Man VenturesVC firm · Westport, CT
Seed, Series A · checks $2M–$5M (est.)
AI & MLCrypto & Web3ConsumerDeveloper Tools - Active Sep 2026
Noar VenturesVC firm · Cos Cob, CT
Pre-seed, Seed · checks $150K–$400K (est.)
Sector focus not yet verified - Active Sep 2026
- Active Sep 2026
- Active Aug 2026
FairviewVC firm · West Hartford, CT
Pre-seed, Seed · checks $300K–$900K (est.)
Sector focus not yet verified - Active Aug 2026
Integra Global Advisors VCVC firm · Stamford, CT
Pre-seed, Seed · checks $50K–$150K (est.)
Sector focus not yet verified - Active Jun 2026
Generation Capital Partners CyeraVC firm · Fairfield, CT
Pre-seed, Seed · checks $150K–$450K (est.)
Sector focus not yet verified - Active May 2026
- Active Apr 2026
Tamarack HarkVC firm · Greenwich, CT
Pre-seed, Seed · checks $200K–$600K (est.)
Sector focus not yet verified - Active Apr 2026
Tamarack Blue EnergyVC firm · Greenwich, CT
Pre-seed, Seed · checks $200K–$600K (est.)
Climate & Energy - Active Mar 2026
Albion Trinity Capital GZLVC firm · Westport, CT
Pre-seed, Seed · checks $150K–$450K (est.)
Sector focus not yet verified - Active Feb 2026
- Active Jan 2026
- Active Jan 2026
- Active Jan 2026
Tamarack AntithesisVC firm · Greenwich, CT
Pre-seed, Seed · checks $150K–$450K (est.)
Sector focus not yet verified - Active Dec 2025
- Active Dec 2025
NSVVC firm · Greenwich, CT
Series A to Growth · checks $200K–$600K (est.)
SpaceB2B SoftwareBiotech & Pharma - Active Dec 2025
Reef PassVC firm · Old Greenwich, CT
Pre-seed, Seed · checks $150K–$450K (est.)
Sector focus not yet verified - Active Nov 2025
SamVed VenturesVC firm · Westport, CT
Pre-seed, Seed · checks $50K–$100K (est.)
Sector focus not yet verified