# Third Security

Third Security is a Single Family Office based in Radford, United States.

## Overview

- **Organization type:** Single Family Office
- **Headquarters:** Radford, United States
- **Region:** North America
- **Address:** The Governor Tyler, 1881 Grove Ave, Radford, VA 24141, United States
- **Founded:** 1999
- **Assets under management:** 1100 (Altss estimate)
- **Website:** thirdsecurity.com
- **LinkedIn:** https://www.linkedin.com/company/third-security-llc

## Regulatory record

- **Reports private funds:** No

## About

Randal J. Kirk established Third Security in 1999 after selling General Injectables & Vaccines in 1998. The firm originated to oversee personal investments tied to his biotechnology and pharmaceutical exits. Third Security functions as both a manager of biotechnology operating companies and a single-family office. It provides capital access, strategic assistance, and business development support. Investments span early-stage seed through late-stage growth in life sciences. Confirmed holdings include equity interests in GreenVenus, Eleszto Genetika, Okanagan Produce Holdings, and Oxitec UK Holdings acquired via TS Biotechnology Holdings in January 2020. Activity centers on North America with a focus on biotech applications. The firm maintains offices in Radford, Virginia and Delray Beach, Florida. It liquidated remaining life-science venture capital funds in December 2020. Adjacent vehicles include the Julian Kirk Foundation and Zylphia Shu-En Kirk Endowment. No verifiable operational events from the last 24 months appear in available records.

## Sectors

- Healthcare Services
- Digital Health
- AgriTech & FoodTech
- ClimateTech

## Offices

- Delray Beach, FL, United States

## People

- Randal J. Kirk — Founder and Executive Chairman

## Questions

### Who runs investment decisions at Third Security?

Randal J. Kirk serves as Founder and Executive Chairman. Julian P. Kirk, his son, acts as CEO and oversees day-to-day operations.

### How does Third Security source proprietary deal flow?

The firm draws on long-standing relationships in biotechnology built since the 1980s. It works directly with portfolio companies on innovation and growth initiatives.

### Is Third Security structured as a single family office or does it operate more like a venture firm?

Third Security operates as a single-family office that also manages a portfolio of operating biotechnology companies. It liquidated its historical venture capital funds in December 2020.

### Does Third Security participate in fund commitments or only direct deals?

The firm focuses on direct investments, structured financings, and ownership of operating companies rather than external fund commitments.

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

Canonical page: https://altss.com/profile/third-security-randal-kirk-family-office

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