![Mark Lappe](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Mark Lappe
No open positions remaining
Net worth: 96 M $ as of 2026-05-30
Profile
Mark Paul Lappe is the founder of Lappe & Associates, Inc. (1990).
Mr. Lappe is the founder of Efficacy Capital LLC (2004).
Mr. Lappe is the founder of Inhibrx LP (2010).
Mr. Lappe is the founder of Sanofi AATD, Inc. (2010).
Mr. Lappe is also the founder of Efficacy Biotech Fund LP.
Mr. Lappe is currently the Chairman & Chief Executive Officer at Inhibrx Biosciences, Inc. since 2025.
Mr. Lappe is currently the Managing Partner at Efficacy Capital Ltd. since 2003.
Formerly, Mr. Lappe served as Chairman at Repros Therapeutics, Inc. from 2008 to 2009.
Mr. Lappe served as Non-Executive Director at Osmetech Ltd. in 2009.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
6.31% | 2026-04-06 | 925,413 ( 6.31% ) | 96 M $ | 2026-05-30 |
Mark Lappe active positions
| Companies | Position | Start |
|---|---|---|
Efficacy Capital Ltd. | Corporate Officer/Principal | 2009-06-09 |
Former positions of Mark Lappe
| Companies | Position | End |
|---|---|---|
| INHIBRX, INC. | Chief Executive Officer | 2024-05-29 |
| REPROS THERAPEUTICS INC | Chairman | 2009-11-11 |
Osmetech Ltd.
 Osmetech Ltd. Medical/Nursing ServicesHealth Services Design, development, manufacture and sale of molecular diagnostics instruments and consumables enabling | Director/Board Member | 2009-08-27 |
Efficacy Biotech Fund LP | Founder | - |
Inhibrx LP
 Inhibrx LP BiotechnologyHealth Technology Develops therapeutic antibodies and pharmaceuticals | Chief Executive Officer | - |
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
14
1st degree connections
8
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 8 |
|---|---|
Repros Therapeutics, Inc.
 Repros Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company that develops drugs to treat hormonal and reproductive system disorders | Health Technology |
Efficacy Capital Ltd. | |
Efficacy Biotech Fund LP | |
Osmetech Ltd.
Osmetech Ltd. Medical/Nursing ServicesHealth Services Design, development, manufacture and sale of molecular diagnostics instruments and consumables enabling | Health Services |
Lappe & Associates, Inc. | |
Efficacy Capital LLC
 Efficacy Capital LLC Investment ManagersFinance Efficacy Capital invests in US publicly-traded stocks and in fixed-income securities. The firm invests mainly in companies operating in the biotechnology and pharmaceutical industries. | Finance |
Inhibrx LP
Inhibrx LP BiotechnologyHealth Technology Develops therapeutic antibodies and pharmaceuticals | Health Technology |
Inhibrx, Inc.
 Inhibrx, Inc. Pharmaceuticals: MajorHealth Technology Operates as clinical-stage biotechnology company that develops biologic therapeutics for the treatment of cancer | Health Technology |
- Stock Market
- Insiders
- Mark Lappe
