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Primer Ventures

3000 El Camino Real Building 4 Suite 200, Palo Alto, CA, 94306, United States

Overview

Primer Ventures focuses on investing in breakthrough innovations and vast market opportunities in the fields of life science tools and therapeutics at an early stage.

Total investments
2
Lead investments
0
Investments · 12mo
2
Active investors
0
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Investment portfolio

  • Fore Biotherapeutics

    Participated · Series D · Jul 2026

    FORE Biotherapeutics is a registration-stage targeted oncology company whose lead asset is plixorafenib (FORE8394; formerly PLX8394), a BRAF inhibitor with a mechanism described as both a dimer and paradox breaker. The company is advancing plixorafenib in the global Phase 2 FORTE Master Protocol, a registration-intended basket study that includes monotherapy baskets for recurrent or progressive BRAF V600E primary CNS tumors, rare BRAF V600 mutated solid tumors, and advanced solid tumors with BRAF fusions. Fore reported that target enrollment of approximately 50 patients has been reached in the BRAF V600E CNS tumor basket and expects topline results from that basket around the end of 2026; the company anticipates a potential regulatory submission if the primary analysis is positive. Plixorafenib received Breakthrough Therapy Designation from the FDA in April 2026, and prior Phase 1/2 data showed a 67% ORR in MAPK inhibitor–naïve BRAF V600 primary recurrent CNS tumors (n=9) and a 42% response rate with a median duration of response of 17.8 months in V600-altered, MAPK inhibitor–naïve patients. The company reported a favorable safety profile for plixorafenib, including a drug-related discontinuation rate of less than 2%, and has implemented protocol changes in FORTE such as allowing dosing with food and lowering the minimum enrollment age to 8 years based on IDMC clearance.

  • Countable Labs

    Participated · Equity · May 2026

    Countable Labs develops Countable PCR, a single-molecule quantification technology that the company says delivers at least 10x the sensitivity of conventional PCR and offers broad dynamic range, multiplexing, and molecular linkage capabilities. The platform is purpose-built for applications across research, translational science, and industrial testing, and the company highlights use cases including cell and gene therapy, oncology, molecular diagnostics, MRD testing, and vaccine quality control. Countable PCR is described as providing superior sensitivity and precision relative to digital PCR and next-generation sequencing, with no Poisson correction or standard curves. The company plans to develop fit-for-purpose 10-color solutions and pursue global commercial expansion, supported by the recent $26 million financing. Countable Labs is privately held, founded in 2019, and headquartered in Palo Alto, California.

Team

No current team members are available.