About Third Prime Alpha
Third Prime Alpha is a venture capital firm based in New York, NY. Since June 2016 it has filed Form D notices for seven funds and one related vehicle. The largest, Third Prime Alpha Fund Iv, LP, reported $87.5M raised from 37 investors.
Funds
Third Prime Alpha has seven funds on file with the SEC, plus one feeder, opportunity or co-investment vehicle. The funds have reported $146.3M raised.
Funds (SEC Form D)
| Fund | First filed | Amount raised | Target | Investors |
|---|---|---|---|---|
| Third Prime Fusion Select, LPVenture capital fund · 3(c)(7) · Form D ↗ | Jun 30, 2026 | None yet | Not set | — |
| Third Prime Alpha Fund Iv, LPVenture capital fund · 3(c)(7) · Form D/A ↗ | Jul 2, 2024 | $87,595,000Jul 2024: $0 Jul 2025: $87.5M | Not set | 37 |
| Third Prime Alpha Fund Iii-A, LPVenture capital fund · 3(c)(7) · Form D ↗ | Dec 3, 2021 | None yet | Not set | — |
| Third Prime Crypto Fund LPVenture capital fund · 3(c)(7) · Form D/A ↗ | Oct 1, 2021 | $23,250,000Oct 2021: $0 Nov 2021: $23.2M | Not set | 41 |
| Third Prime Alpha Fund Iii, LPVenture capital fund · 3(c)(1) · Form D ↗ | Jul 23, 2021 | None yet | Not set | — |
| Third Prime Alpha Fund II, LPVenture capital fund · 3(c)(1) · Form D/A ↗ | Feb 4, 2019 | $35,545,000Feb 2019: $0 Feb 2020: $35.5M | $60,000,000 | 52 |
| Third Prime Alpha Fund, LPVenture capital fund · 3(c)(1), 3(c)(7) · Form D ↗ | Jun 30, 2016 | None yet | $25,000,000 | — |
Amounts and investor counts come from each fund's latest Form D or amendment; the dated lines under an amount show what earlier filings reported. "Not set" means the fund did not give a target. Form D does not report returns.
Feeder, opportunity and co-investment vehicles (1)
| Vehicle | Kind | First filed | Amount raised | Investors | Filing |
|---|---|---|---|---|---|
| Third Prime Crypto Feeder LP | Feeder or parallel fund | Oct 1, 2021 | $5,000,000 | 4 | Form D ↗ |
These vehicles usually hold a single investment or a small group of them. Their filings do not name the companies they hold.
Portfolio Companies
Companies where a Third Prime Alpha partner sits on the board, according to the company's own Form D. A board seat usually comes with an investment, but Form D does not list investors.
| Company | Location | Third Prime Alpha director | On the board | Latest raise |
|---|---|---|---|---|
| UnityAI Inc | Nashville, TN | Wesley Barton | 2026 | $15.0M ↗Feb 2026 |
| AbbeyCross Inc. | Brooklyn, NY | Keith Hamlin | 2023–2024 | $1.9M ↗Nov 2024 |
| HouseAmp Inc. | Poulsbo, WA | Keith Hamlin | 2024 | $12.4M ↗Jun 2024 |
| Twentyeight Health, Inc. | Brooklyn, NY | Wes Barton | 2024 | $18.1M ↗Sep 2024 |
| All Inspire Health, Inc. | Cumberland Gate, Brooklyn, NY | Keith Hamlin | 2019–2023 | $84.9M ↗Jun 2025 |
| Kafene, Inc. | New York, NY | Keith Hamlin, Wesley Barton | 2022–2023 | $12.6M ↗Jun 2023 |
People
Partners and officers named on Third Prime Alpha's fund filings.
Sources
- SECEvery Form D filing behind this page is linked in the tables above.