Based on data from the past 90 days ending February 07, 2026, Avidity Biosciences's three largest insider shareholders are TenPercentOwner Investments, Lp Rtw (4.79Mn shares), President And Ceo Sarah Boyce (269.01K shares), Chief Human Resources Officer Teresa Mccarthy (113.94K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Investments, Lp Rtw | 4,795,000 | 06 Aug, 2021 | |
| Sarah Boyce | President And Ceo | 269,007 | 23 Jan, 2026 |
| Teresa Mccarthy | Chief Human Resources Officer | 113,938 | 23 Jan, 2026 |
| W. Michael Flanagan | Chief Scientific Officer | 85,093 | 23 Jan, 2026 |
| Kathleen P. Gallagher | Chief Program Officer | 80,838 | 19 Dec, 2025 |
| Eric Mosbrooker | Chief Commercial Officer | 79,010 | 19 Dec, 2025 |
| John B Moriarty | Chief Legal Officer | 74,557 | 09 Jan, 2026 |
| Troy Edward Wilson | 72,201 | 09 Sep, 2025 | |
| Michael F Maclean | Chief Financial Officer | 59,290 | 23 Jan, 2026 |
| Charles Iii Calderaro | Chief Technical Officer | 49,797 | 09 Jan, 2026 |
| Arthur A Levin | 39,062 | 23 Jan, 2026 | |
| Steven George Hughes | Chief Medical Officer | 31,599 | 23 Jan, 2026 |
| Jean Jinsun Kim | 6,692 | 12 Jun, 2025 | |
| Noreen Henig | 6,692 | 12 Jun, 2025 | |
| Tamar Thompson | 6,692 | 12 Jun, 2025 | |
| Simona Skerjanec | 6,692 | 12 Jun, 2025 | |
| Edward M. Md Kaye | 6,692 | 12 Jun, 2025 | |
| Carsten Boess | 6,692 | 12 Jun, 2025 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 21 Jan, 2026 | Arthur A Levin | Common Stock | D | 1,758 | $72.45 | 16,562 | D | S |
| 21 Jan, 2026 | Michael F Maclean | Common Stock | D | 2,735 | $72.45 | 59,290 | D | S |
| 21 Jan, 2026 | Michael F Maclean | Common Stock | D | 1,807 | $72.45 | 62,025 | D | S |
| 21 Jan, 2026 | Sarah Boyce | Common Stock | D | 7,993 | $72.45 | 269,007 | D | S |
| 21 Jan, 2026 | Sarah Boyce | Common Stock | D | 6,394 | $72.45 | 277,000 | D | S |
| 21 Jan, 2026 | Steven George Hughes | Common Stock | D | 2,878 | $72.45 | 31,599 | D | S |
| 21 Jan, 2026 | Steven George Hughes | Common Stock | D | 2,017 | $72.45 | 34,477 | D | S |
| 21 Jan, 2026 | W. Michael Flanagan | Common Stock | D | 2,558 | $72.45 | 85,093 | D | S |
| 21 Jan, 2026 | W. Michael Flanagan | Common Stock | D | 3,976 | $72.45 | 87,651 | D | S |
| 21 Jan, 2026 | Teresa Mccarthy | Common Stock | D | 1,453 | $72.45 | 113,938 | D | S |
| 21 Jan, 2026 | Teresa Mccarthy | Common Stock | D | 1,476 | $72.45 | 115,391 | D | S |
| 07 Jan, 2026 | Michael F Maclean | Common Stock | D | 1,974 | $72.23 | 63,832 | D | S |
| 07 Jan, 2026 | John B Moriarty | Common Stock | D | 2,374 | $72.23 | 74,557 | D | S |
| 07 Jan, 2026 | Sarah Boyce | Common Stock | D | 8,576 | $72.23 | 283,394 | D | S |
| 07 Jan, 2026 | Steven George Hughes | Common Stock | D | 2,373 | $72.23 | 36,494 | D | S |
| 07 Jan, 2026 | W. Michael Flanagan | Common Stock | D | 2,373 | $72.23 | 91,627 | D | S |
| 07 Jan, 2026 | Teresa Mccarthy | Common Stock | D | 1,965 | $72.23 | 116,867 | D | S |
| 07 Jan, 2026 | Charles Iii Calderaro | Common Stock | D | 3,727 | $72.23 | 49,797 | D | S |
| 19 Dec, 2025 | Arthur A Levin | Common Stock | D | 1,330 | $0.00 | 18,320 | D | G |
| 18 Dec, 2025 | Sarah Boyce | Common Stock | D | 29,159 | $0.00 | 291,970 | D | G |