AIBiotech & Life SciencesClimate & EnergyDefense & SpaceEnterprise SoftwareRobotics & AutomationSaaS
SBXi is an early-stage venture capital fund that exclusively backs MIT alumni founders across any sector. It is jointly sponsored by eight firms including Accel, Polaris Partners, General Catalyst, Pillar, Danaher, Underscore VC, Glasswing Ventures, and GETTYLAB, writing $10K-$100K checks on SAFEs and $100K-$1M checks on qualifying priced rounds.
33% of their portfolio is in Cybersecurity. Their most common stage is seed (67% of deals). Average disclosed round size is $3.5M (across 5 rounds with reported amounts).
Portfolio
6
Fund Size
—
Top Stage
Seed
Last 12 Mo
0
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
6 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Surgicure Technologies | Seed | $1.8M | Jan 2025 |
 ZeroRISC | Seed | $10M | Jan 2025 |
 Undermind | Pre-Seed | $500K | Sep 2024 |
 Fabri | Seed | $5M | Jan 2024 |
 Nowadays | Unknown | $300K | Jan 2024 |
 Unbound Security | Seed | — | — |
Top Co-Investors
Y Combinator3 shared
Pioneer Fund2 shared
Unpopular Ventures1 shared
FundersClub1 shared
Lavrock Ventures1 shared
Lockheed Martin Ventures1 shared
Wayfinder Ventures1 shared
Massive1 shared
Transpose Platform1 shared
Alpha Square Group1 shared
Underdog Labs1 shared
Decacorn Capital1 shared
Basis Set Ventures1 shared
Techstars1 shared
Launchpad Capital1 shared
Fontinalis Partners1 shared
private angel investors1 shared
Fundomo1 shared
Last updated: 8 September 2026