Puma Biotechnology, Inc.
Ownership
Ownership Structure
Who owns Puma Biotechnology, Inc. (PBYI)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 76.8% of the shares are freely tradable; institutional investors hold 75.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 6.97 | 3,598,952 | -1.2 | 03/31/2026 |
| American Century Companies Inc | 4.49 | 2,319,996 | +21.1 | 06/30/2026 |
| Acadian Asset Management LLC | 3.96 | 2,041,759 | +711.3 | 03/31/2026 |
| Renaissance Technologies Corp | 3.76 | 1,942,413 | -8.5 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.52 | 1,817,681 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 3.36 | 1,734,649 | +0.0 | 03/31/2026 |
| LSV Asset Management | 3.13 | 1,617,981 | +36.8 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 2.94 | 1,518,014 | +5.7 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Avantis US Small Cap Value ETF | 4.38 | 2,262,093 | +0.1 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 2.60 | 1,343,121 | +0.0 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Auerbach Alan H | President and CEO | 7,261,671 | 68,985,875 $ | Jul 6, 2026 | direct |
| Nougues Maximo F | Chief Financial Officer | 230,637 | 2,191,052 $ | Jul 6, 2026 | direct |
| Hunt Douglas M | See Remarks | 196,841 | 1,869,990 $ | Jul 6, 2026 | direct |
| Cesano Alessandra | Director | 56,700 | 538,650 $ | Sep 14, 2026 | direct |
| Wilson Troy Edward | Director | 54,750 | 520,125 $ | Sep 14, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 14, 2026 | Wilson Troy Edward | Director | Sell | 5,000 | 9.10 | 45,500 |
| Sep 14, 2026 | Cesano Alessandra | Director | Sell | 62,150 | 9.12 | 566,994 |
| Sep 14, 2026 | Cesano Alessandra | Director | Other | 50,000 | 2.93 | 146,500 |
| Jul 6, 2026 | Auerbach Alan H | President and CEO | Sell | 44,058 | 8.26 | 364,051 |
| Jul 6, 2026 | Hunt Douglas M | See Remarks | Sell | 8,460 | 8.26 | 69,905 |
| Jul 6, 2026 | Nougues Maximo F | Chief Financial Officer | Sell | 9,386 | 8.26 | 77,557 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.