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Founded in 1971, Schooner Capital is a Boston-based private investment firm engaged in venture capital and public securities. It operates from a permanent capital base with no outside limited partners, investing across sector, stage, and geography with a long-term, contrarian perspective.
Deal activity decreased year-over-year (1 deal in the last 12 months vs 2 prior). Average disclosed round size is $30.3M (across 35 rounds with reported amounts).
Portfolio
28
Fund Size
—
Top Stage
Series A
Last 12 Mo
1
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
37 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 CareCubes | Series A | $6.5M | Mar 2026 |
| MManna Drone Delivery | Series B | $50M | Jan 2026 |
| RRemedy Plan Therapeutics | Series A | $18M | May 2025 |
 Onebeat | Series B | $15M | May 2025 |
 Remedy Plan | Unknown | $18M | Jan 2025 |
| RRemedy Plan Therapeutics | Unknown | $18M | Jan 2025 |
 Cartesian | Unknown | $130M | Jul 2024 |
| BBrixton Biosciences | Series B | $33M | May 2024 |
 Mantle | Series C | $20M | Jan 2024 |
 Cartesian Therapeutics | Unknown | $130M | Jan 2024 |
 JetCool | Series A | $17M | Oct 2023 |
 Breezeway | Series A | $15M | Jan 2023 |
 Selux Diagnostics | Series C | $50M | Feb 2022 |
| ZZippity Cars | Seed | $3M | Jan 2022 |
 Amplified | Seed | $10M | Sep 2021 |
 MarginEdge | Series B | $18M | Sep 2021 |
 Commonwealth Fusion Systems Llc | Series C | $84M | May 2020 |
 Amplified Industries | Seed | — | Jan 2020 |
| Amplified Industries | Pre-Seed | $10M | Jan 2020 |
| Breezeway | Series A | $8M | Jan 2020 |
 Zippity | Seed | $3.3M | Sep 2019 |
| Commonwealth Fusion Systems Llc | Series A | $115M | Jun 2019 |
| CCommonwealth Fusion Systems (CFS) | Series A | $115M | Jun 2019 |
 Censinet | Series A | $7.8M | Apr 2019 |
| Censinet | Series A | $7.8M | Jan 2019 |
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Top Co-Investors
Future Fund3 shared
Safar Partners3 shared
Starlight Ventures3 shared
Moore Strategic Ventures3 shared
Breakthrough Energy Ventures3 shared
Khosla Ventures3 shared
Alexandria Venture Investments3 shared
CEAS Investments3 shared
Engine Ventures2 shared
True Ventures2 shared
Health Catalyst Capital2 shared
SV Health Investors2 shared
HLM Investment Partners2 shared
LRVHealth2 shared
Catalyst Investors2 shared
bp ventures2 shared
York IE2 shared
Launchpad Capital2 shared
Techstars2 shared
Northpond Ventures2 shared
Last updated: 7 October 2026