O'Brien Patrick, COO of Arrowhead Pharmaceuticals ($ARWR), sold shares on the open market 12 times over the past year, totaling about $3.1 million. His most recent sale occurred on January 5, 2026. These sales rank him 2,645th among 11,678 insiders in our database by total value sold, compared to an average of $8.6 million across about six transactions per insider. He made no open market purchases in this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 6, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 540 | $0.00 | 474,368.0000 | 140,706,000 | 0.11% | 0.00% |
| Jan. 6, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | A | Common Stock | 75000 | $0.00 | 547,408.0000 | 140,706,000 | 15.88% | 0.05% |
| Jan. 6, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 440 | $0.00 | 472,408.0000 | 140,706,000 | 0.09% | 0.00% |
| Jan. 6, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 440 | $0.00 | 472,848.0000 | 140,706,000 | 0.09% | 0.00% |
| Jan. 6, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 540 | $0.00 | 473,288.0000 | 140,706,000 | 0.11% | 0.00% |
| Jan. 6, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 540 | $0.00 | 473,828.0000 | 140,706,000 | 0.11% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 4368 | $61.20 | 520,033.0000 | 140,706,000 | 0.83% | 0.00% |
| Dec. 31, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 560 | $0.00 | 524,961.0000 | 133,758,000 | 0.11% | 0.00% |
| Dec. 31, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 560 | $0.00 | 524,401.0000 | 133,758,000 | 0.11% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 6164 | $62.23 | 513,869.0000 | 140,706,000 | 1.19% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 13451 | $62.96 | 500,418.0000 | 140,706,000 | 2.62% | 0.01% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 11842 | $63.84 | 488,576.0000 | 140,706,000 | 2.37% | 0.01% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 2700 | $64.44 | 485,876.0000 | 140,706,000 | 0.55% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 900 | $66.01 | 484,976.0000 | 140,706,000 | 0.19% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 313 | $68.00 | 484,663.0000 | 140,706,000 | 0.06% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 600 | $61.12 | 484,063.0000 | 140,706,000 | 0.12% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 900 | $62.25 | 483,163.0000 | 140,706,000 | 0.19% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 5873 | $62.91 | 477,290.0000 | 140,706,000 | 1.22% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 2336 | $64.04 | 474,954.0000 | 140,706,000 | 0.49% | 0.00% |
| Jan. 5, 2026 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | S | Common Stock | 46 | $68.00 | 474,908.0000 | 140,706,000 | 0.01% | 0.00% |
| Dec. 31, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 560 | $0.00 | 526,641.0000 | 133,758,000 | 0.11% | 0.00% |
| Dec. 31, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 560 | $0.00 | 526,081.0000 | 133,758,000 | 0.11% | 0.00% |
| Dec. 31, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO | G | Common Stock | 560 | $0.00 | 525,521.0000 | 133,758,000 | 0.11% | 0.00% |
| Jan. 6, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 19658 | $19.69 | 544,727.0000 | 124,848,000 | 3.48% | 0.02% |
| Jan. 7, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 8000 | $19.69 | 527,201.0000 | 124,848,000 | 1.49% | 0.01% |
| Jan. 4, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | A | Common Stock | 100000 | $0.00 | 564,385.0000 | 124,848,000 | 21.53% | 0.08% |
| Jan. 6, 2025 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 9526 | $20.10 | 535,201.0000 | 124,848,000 | 1.75% | 0.01% |
| Jan. 5, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 8200 | $34.99 | 477,126.0000 | 106,750,000 | 1.69% | 0.01% |
| Jan. 5, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 12741 | $35.65 | 464,385.0000 | 106,750,000 | 2.67% | 0.01% |
| Jan. 3, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 3849 | $31.83 | 408,726.0000 | 106,750,000 | 0.93% | 0.00% |
| Jan. 3, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 400 | $33.41 | 405,526.0000 | 106,750,000 | 0.10% | 0.00% |
| Jan. 3, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 1700 | $32.65 | 403,826.0000 | 106,750,000 | 0.42% | 0.00% |
| Jan. 3, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 2800 | $32.52 | 405,926.0000 | 106,750,000 | 0.69% | 0.00% |
| Jan. 4, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 1600 | $32.63 | 402,226.0000 | 106,750,000 | 0.40% | 0.00% |
| Jan. 4, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | A | Common Stock | 85000 | $0.00 | 487,226.0000 | 106,750,000 | 21.13% | 0.08% |
| Jan. 5, 2024 | ARROWHEAD PHARMACEUTICALS, INC. | $ARWR | O'Brien Patrick | COO and General Counsel | S | Common Stock | 1900 | $33.99 | 485,326.0000 | 106,750,000 | 0.39% | 0.00% |