Third Security is a United States-based investment firm and family office focused on biotechnology and life sciences. The firm manages a portfolio of operating companies and works closely with them to drive innovation and growth in areas related to biological sciences. Historically, it also managed multiple venture capital funds focused on life sciences and regional investments, though these funds have since been liquidated. Third Security combines capital deployment with active portfolio management and long-term strategic involvement. Its approach centers on leveraging biology-driven innovation to address global challenges.