# Westlake Village BioPartners

Westlake Village BioPartners is a Venture Capital based in Westlake Village, United States.

## Overview

- **Organization type:** Venture Capital
- **Headquarters:** Westlake Village, United States
- **Region:** North America
- **Address:** Westlake Village, CA, United States
- **Founded:** 2018
- **Assets under management:** Undisclosed
- **Website:** westlakebio.com
- **LinkedIn:** https://www.linkedin.com/company/westlake-biopartners

## Regulatory record

- **Reports private funds:** No

## About

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.

## Sectors

- Biotechnology
- Digital Health
- Healthcare Services

## People

- Beth Seidenberg — Co-Founder & Managing Director
- Sean Harper — Co-Founder & Managing Director

## Questions

### How does Westlake Village BioPartners source proprietary deal flow?

The firm's sourcing advantage stems from its physical location in the Greater Los Angeles area, specifically Westlake Village. This sits adjacent to Thousand Oaks, the global headquarters of Amgen. The density of Amgen alumni and life sciences talent in the region creates a pipeline of new company formation that Westlake Village BioPartners is positioned to access before coastal venture capital firms.

### What investment stages does Westlake Village BioPartners target?

The firm leads or co-leads seed and Series A rounds, with a stated intent to reserve capital for follow-on investments through clinical proof-of-concept. Fund I was $320 million; Fund II, announced in 2022, totaled $450 million. The stage focus is early, but the firm's reserve strategy allows it to maintain meaningful ownership positions as companies advance toward clinical data readouts.

### Does Westlake Village BioPartners participate in fund commitments or only direct deals?

Westlake Village BioPartners operates exclusively as a direct investor, taking equity positions in early-stage life sciences companies. There is no public evidence of fund-of-funds activity, special-purpose vehicles for LP co-investment, or secondary market participation. The firm's model is structured entirely around building and backing new companies from formation through clinical milestones.

### What is the performance track record of Westlake Village BioPartners' funds?

The firm does not publicly disclose fund-level performance metrics, including internal rates of return, multiples on invested capital, or distributions to paid-in capital. Fund I is sufficiently mature to have returned capital through exits including the Acelyrin IPO, but formal performance data has not been released to media or public filings.

### Does Westlake Village BioPartners have a succession plan?

The firm has not publicly communicated a succession plan. Seidenberg and Harper remain the sole named managing directors, and no junior investment partners have been elevated to managing director or added to the firm's leadership filings. For institutional allocators considering a commitment, this concentration of decision-making authority is a due-diligence item.

## Related profiles

- [Westlake Ventures](https://altss.com/profile/westlake-ventures)
- [West Lane Capital Partners](https://altss.com/profile/west-lane-capital-partners)

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Last updated: 2026-06-03T20:00:00.000Z

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