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§ Venture Capital · San Diego, CA, USA
Prime Eight Capital functions as a venture capital firm, strategically deploying capital into late-stage biotechnology companies. Based in San Diego, the firm focuses on identifying and supporting innovative enterprises as they navigate the complex and capital-intensive final phases of therapeutic development, aiming to accelerate their journey from clinical trials to market.
The firm's establishment was driven by a recognition of the significant funding gap often faced by biotech companies as they approach the costly and critical late stages of product development. This insight fueled the creation of a specialized investment vehicle designed to provide crucial financial backing to advance medical innovations.
Prime Eight Capital's portfolio companies are typically those on the cusp of commercialization, requiring substantial investment to complete pivotal studies and secure regulatory approvals. The firm's long-term vision is to be a key facilitator in the development and delivery of novel treatments, fostering the growth of companies that address unmet medical needs.
Prime Eight Capital has 1 tracked investment across 1 company. The latest tracked deal is $153.0M Series E in Arthrosi Therapeutics in October 2025.
| Date | Company | Round | Lead Investor(s) | Co-Investor(s) |
|---|---|---|---|---|
| Oct 8, 2025 | Arthrosi Therapeutics | $153.0M Series E | Prime Eight Capital | CR, HM Venture Partners, Relianttech |