Puma Biotechnology
PBYI · NASDAQ
$10.76+$0.55 (+5.39%)TodayMarket closed ·
Prev close $10.21
Who owns PBYI
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 53.6% of PBYI’s shares.
- Auerbach (Alan H)13.8%
- Acorn Capital Advisors, LLC8.1%
- BlackRock Institutional Trust Company, N.A.6.1%
- American Century Investment Management, Inc.4.6%
- Next 6 largest institutions21.0%
- All other shareholders46.4%
| Holder | Shares | % of shares |
|---|---|---|
| Auerbach (Alan H) | 7.00M | 13.76% |
| Acorn Capital Advisors, LLC | 4.13M | 8.12% |
| BlackRock Institutional Trust Company, N.A. | 3.12M | 6.12% |
| American Century Investment Management, Inc. | 2.32M | 4.56% |
| Acadian Asset Management LLC | 2.05M | 4.03% |
| Renaissance Technologies LLC | 1.84M | 3.61% |
| Vanguard Capital Management, LLC | 1.84M | 3.61% |
| Vanguard Portfolio Management, LLC | 1.83M | 3.59% |
| LSV Asset Management | 1.62M | 3.18% |
| Dimensional Fund Advisors, L.P. | 1.52M | 2.98% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Avantis US Small Cap Value ETF | 2.26M | 4.44% |
| Vanguard Total Stock Market Index Fund | 1.34M | 2.64% |
| iShares Russell 2000 ETF | 1.17M | 2.30% |
| Vanguard Explorer Fund | 777.39K | 1.53% |
| Vanguard Strategic Equity Fund | 540.43K | 1.06% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $1.70M (10 trades) of PBYI on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| WILSON TROY EDWARD | Sale | 5.00K | $45.50K |
| Cesano Alessandra | Option exercise | 50.00K | — |
| Cesano Alessandra | Sale | 62.15K | $566.99K |
| Cesano Alessandra | Option exercise | 50.00K | $146.50K |
| HUNT DOUGLAS M | Sale | 8.46K | $69.90K |
| NOUGUES MAXIMO F | Sale | 9.39K | $77.56K |
| AUERBACH ALAN H | Sale | 44.06K | $364.05K |
| WILSON TROY EDWARD | Sale | 10.80K | $77.75K |
| Stuglik Brian M | Sale | 8.10K | $58.31K |
| Senderowicz Adrian | Sale | 27.00K | $194.31K |
Short interest
Settled Sep 30, 2026
- Shares short
- 4.26M
- Days to cover
- 14.02
- % of shares outstanding
- 8.38%
- Average daily volume
- 304.29K
- Change since last report
- −1.3%
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