Over the 90-day window ending January 10, 2026, Arrowhead Pharmaceuticals's three dominant insider ownership positions are held by Chief Executive Officer Christopher Richard Anzalone (3.79Mn shares), Coo Patrick O'Brien (547.41K shares), Chief Financial Officer Kenneth Allen Myszkowski (455.43K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Christopher Richard Anzalone | Chief Executive Officer | 3,792,739 | 05 Jan, 2026 |
| Patrick O'Brien | Coo | 547,408 | 08 Jan, 2026 |
| Kenneth Allen Myszkowski | Chief Financial Officer | 455,433 | 07 Jan, 2025 |
| James C Hamilton | Chief Medical Officer | 246,958 | 08 Jan, 2026 |
| Martin Javier San | Chief Medical Officer | 198,497 | 08 Jan, 2024 |
| Daniel Joseph Apel | Chief Financial Officer | 176,200 | 08 Jan, 2026 |
| Douglas B Given | 137,167 | 18 Dec, 2024 | |
| Tracie Oliver | Chief Commercial Officer | 127,107 | 03 Jul, 2024 |
| Michael S Perry | 123,059 | 18 Dec, 2025 | |
| James Hassard | Chief Commercial Officer | 105,750 | 24 Jun, 2021 |
| Mauro Ferrari | 69,053 | 30 Dec, 2025 | |
| William D. Waddill | 56,563 | 23 Dec, 2025 | |
| Hongbo Lu | 54,982 | 18 Dec, 2025 | |
| Douglas S Ingram | 46,215 | 18 Dec, 2025 | |
| Victoria Vakiener | 35,723 | 23 Dec, 2025 | |
| Adeoye Y Olukotun | 33,600 | 23 Dec, 2025 | |
| Backer Marianne De | 31,267 | 11 Jan, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 06 Jan, 2026 | Patrick O'Brien | Common Stock | D | 440 | $0.00 | 472,848 | D | G |
| 06 Jan, 2026 | Patrick O'Brien | Common Stock | D | 540 | $0.00 | 474,368 | D | G |
| 06 Jan, 2026 | Patrick O'Brien | Common Stock | D | 540 | $0.00 | 473,828 | D | G |
| 06 Jan, 2026 | Patrick O'Brien | Common Stock | A | 75,000 | $0.00 | 547,408 | D | A |
| 06 Jan, 2026 | Patrick O'Brien | Common Stock | D | 440 | $0.00 | 472,408 | D | G |
| 06 Jan, 2026 | Patrick O'Brien | Common Stock | D | 540 | $0.00 | 473,288 | D | G |
| 06 Jan, 2026 | James C Hamilton | Common Stock | A | 75,000 | $0.00 | 246,958 | D | A |
| 06 Jan, 2026 | Daniel Joseph Apel | Common Stock | A | 75,000 | $0.00 | 176,200 | D | A |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 6,164 | $62.23 | 513,869 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 900 | $62.25 | 483,163 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 2,700 | $64.44 | 485,876 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 900 | $66.01 | 484,976 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 4,368 | $61.20 | 520,033 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 313 | $68.00 | 484,663 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 5,873 | $62.91 | 477,290 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 11,842 | $63.84 | 488,576 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 600 | $61.12 | 484,063 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 13,451 | $62.96 | 500,418 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 2,336 | $64.04 | 474,954 | D | S |
| 05 Jan, 2026 | Patrick O'Brien | Common Stock | D | 46 | $68.00 | 474,908 | D | S |