In the last 12 months, insiders at Arrowhead Pharmaceuticals made open-market sales of $37.34 million (560.5K shares) and bought no shares on the open market.
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Christopher Richard Anzalone | Chief Executive Officer | 3,792,739 | 0 | 3,792,739 | 61.4% | 05 Jan, 2026 |
| 2 | Patrick O'Brien | Coo | 547,408 | 0 | 547,408 | 8.9% | 08 Jan, 2026 |
| 3 | Kenneth Allen Myszkowski | Chief Financial Officer | 455,433 | 0 | 455,433 | 7.4% | 07 Jan, 2025 |
| 4 | Martin Javier San | Chief Medical Officer | 289,997 | 0 | 289,997 | 4.7% | 05 Jan, 2024 |
| 5 | James C Hamilton | Chief Medical Officer | 226,958 | 0 | 226,958 | 3.7% | 24 Apr, 2026 |
| 6 | Daniel Joseph Apel | Chief Financial Officer | 162,905 | 0 | 162,905 | 2.6% | 24 Apr, 2026 |
| 7 | Tracie Oliver | Chief Commercial Officer | 127,107 | 0 | 127,107 | 2.1% | 03 Jul, 2024 |
| 8 | Douglas B Given | Director | 124,167 | 0 | 124,167 | 2.0% | 18 Dec, 2024 |
| 9 | Michael S Perry | Director | 111,459 | 0 | 111,459 | 1.8% | 20 Aug, 2026 |
| 10 | Mauro Ferrari | Director | 69,053 | 0 | 69,053 | 1.1% | 30 Dec, 2025 |
| 11 | William D. Waddill | Director | 56,563 | 0 | 56,563 | 0.9% | 23 Dec, 2025 |
| 12 | Hongbo Lu | Director | 52,012 | 0 | 52,012 | 0.8% | 14 May, 2026 |
| 13 | Douglas S Ingram | Director | 46,215 | 0 | 46,215 | 0.7% | 18 Dec, 2025 |
| 14 | Victoria Vakiener | Director | 35,723 | 0 | 35,723 | 0.6% | 23 Dec, 2025 |
| 15 | Adeoye Y Olukotun | Director | 31,600 | 0 | 31,600 | 0.5% | 20 Aug, 2026 |
| 16 | Backer Marianne De | Director | 31,267 | 0 | 31,267 | 0.5% | 11 Jan, 2023 |
| 17 | Matthew Gregory Cohen | Director | 11,882 | 0 | 11,882 | 0.2% | 17 Jun, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 18 Aug, 2026 | Adeoye Y Olukotun | Director | Disposed S | 2,000 | $86.96 | $173.92K | 31,600 | Direct |
| 18 Aug, 2026 | Michael S Perry | Director | Disposed S | 11,600 | $87.30 | $1.01Mn | 111,459 | Direct |
| 15 Jun, 2026 | Matthew Gregory Cohen | Director | Acquired A | 11,882 | $0.00 | $0 | 11,882 | Direct |
| 12 May, 2026 | Hongbo Lu | Director | Disposed S | 2,970 | $76.88 | $228.33K | 52,012 | Direct |
| 22 Apr, 2026 | Daniel Joseph Apel | Chief Financial Officer | Disposed S | 3,208 | $70.11 | $224.91K | 172,792 | Direct |
| 23 Apr, 2026 | James C Hamilton | Chief Medical Officer | Disposed S | 10,000 | $75.00 | $750.00K | 226,958 | Direct |
| 22 Apr, 2026 | Daniel Joseph Apel | Chief Financial Officer | Disposed S | 1,157 | $70.45 | $81.51K | 171,635 | Direct |
| 22 Apr, 2026 | Daniel Joseph Apel | Chief Financial Officer | Disposed S | 8,730 | $71.92 | $627.86K | 162,905 | Direct |
| 05 Mar, 2026 | James C Hamilton | Chief Medical Officer | Disposed S | 10,000 | $64.19 | $641.90K | 236,958 | Direct |
| 06 Jan, 2026 | Daniel Joseph Apel | Chief Financial Officer | Acquired A | 75,000 | $0.00 | $0 | 176,200 | Direct |
| 06 Jan, 2026 | James C Hamilton | Chief Medical Officer | Acquired A | 75,000 | $0.00 | $0 | 246,958 | Direct |
| 06 Jan, 2026 | Patrick O'Brien | Coo | Disposed G | 540 | $0.00 | $0 | 474,368 | Direct |
| 06 Jan, 2026 | Patrick O'Brien | Coo | Disposed G | 540 | $0.00 | $0 | 473,828 | Direct |
| 06 Jan, 2026 | Patrick O'Brien | Coo | Disposed G | 540 | $0.00 | $0 | 473,288 | Direct |
| 06 Jan, 2026 | Patrick O'Brien | Coo | Disposed G | 440 | $0.00 | $0 | 472,848 | Direct |
| 06 Jan, 2026 | Patrick O'Brien | Coo | Disposed G | 440 | $0.00 | $0 | 472,408 | Direct |
| 06 Jan, 2026 | Patrick O'Brien | Coo | Acquired A | 75,000 | $0.00 | $0 | 547,408 | Direct |
| 31 Dec, 2025 | Patrick O'Brien | Coo | Disposed G | 560 | $0.00 | $0 | 526,641 | Direct |
| 02 Jan, 2026 | Christopher Richard Anzalone | Chief Executive Officer | Disposed S | 7,416 | $65.88 | $488.57K | 3,798,510 | Direct |
| 05 Jan, 2026 | James C Hamilton | Chief Medical Officer | Disposed S | 4,625 | $61.24 | $283.24K | 207,497 | Direct |