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Venture Capital
Westlake Village, CA
Westlake BioPartners is a people-first life science venture capital firm that crafts companies around world-class entrepreneurs. Immersed in the Los Angeles biotech community, we incubate the most promising companies to turn breakthroughs into treatments for patients in need.
Data as of (this record's last observation) from federal regulator filings, firm and issuer disclosures. Page built and rebuilt at most every 15 minutes.
| Fund | Vintage | Lifecycle | Form D sold | GAV | LPs |
|---|---|---|---|---|---|
| Westlake Biopartners Fund III, L.P. | 2024 | Early deployment | $0 | $456M | 0 |
| Westlake Biopartners Fund II, L.P. | 2021 | Mature | $0 | $405M | 0 |
| Westlake Biopartners Opportunity Fund I, L.P. | 2020 | Mature | $100M | $103M | 0 |
| Westlake Biopartners Fund I, L.P. | 2018 | Harvest | $320M | $523M | 0 |
| Company | State | Stage | Round size | Partner | Attribution | Observed |
|---|---|---|---|---|---|---|
| 3T Biosciences | n/a | n/a | n/a | n/a | Unknown | Sep 16, 2026 |
| Alumis Inc. | CA | n/a | n/a | n/a | Unknown | Sep 16, 2026 |
| AllRock | n/a | n/a | n/a | n/a | Unknown | Sep 16, 2026 |
| Arsenal | n/a | n/a | n/a | n/a | Unknown | Sep 16, 2026 |
| Borealis Biosciences | n/a | n/a | n/a | n/a | Unknown | Sep 16, 2026 |
| Capsida | n/a | n/a | n/a | n/a | Unknown | Sep 16, 2026 |
| Electra Therapeutics, Inc. | CA | n/a | n/a | n/a | Unknown | Sep 16, 2026 |
| Kate | n/a | n/a | n/a | n/a | Unknown | Sep 16, 2026 |
| Star Therapeutics LLC | CA | n/a | n/a | Beth Seidenberg | Strongly supported | Oct 6, 2025 |
| AllRock Bio | n/a | Series a | $50.0M | n/a | Unknown | Sep 16, 2025 |
| Latigo Biotherapeutics, Inc. | CA | n/a | n/a | Beth Seidenberg | Strongly supported | Feb 13, 2025 |
| Arsenal Biosciences, Inc. | CA | n/a | n/a | Beth Seidenberg | Strongly supported | Sep 4, 2024 |
| Investor | Co-investor | Shared deals | Shared companies | Last observed | Strength |
|---|---|---|---|---|---|
| NEW Leaf Venture Partners | Westlake Biopartners, LLC | 2 | 2 | Sep 16, 2026 | Recurring |
| Omega Fund Management, LLC | Westlake Biopartners, LLC | 1 | 1 | Sep 16, 2026 | One time |
| Westlake Biopartners, LLC | CRV, LLC | 1 | 1 | Sep 16, 2026 | One time |
| Asset Management Ventures, LLC | Westlake Biopartners, LLC | 1 | 1 | Sep 16, 2026 | One time |
| Westlake Biopartners, LLC | Foresite Capital | 1 | 1 | Sep 16, 2026 | One time |
| Westlake Biopartners, LLC | Versant Venture Management, LLC | 1 | 1 | Sep 16, 2025 | One time |
| Westlake Biopartners, LLC | Arch Venture Partners | 1 | 1 | Sep 16, 2026 | One time |
Also named here, with no published line of their own (reach them through the firm): David Allison (Managing Director), Mira Chaurushiya (Managing Director), Beth Seidenberg (Managing Director), Armando Alvarez (Finance Manager), Jennifer Kercher (General Counsel), Kelli McKeirnan (Director of Administration), Click Me (Founding Managing Director), Brogan Perrelli (Vice President Finance And Operations), Lauren Popov (Associate), David D Allison (Managing Director), Jennifer Kercher (General Counsel), Sean Harper (Managing Director).
Who to call is the organisation, the person's role and the line they published themselves: a business phone, office address, website or profile link from Form ADV, Form 13F or their own website, with that source named on every value. The counts above are what a reveal returns; a personal email is rarely published, so most reveals are the firm's line. Never data bought from a provider, never anything personal. Reveals by plan