As of March 23, 2026, the three largest insider holders of ARCT are Joseph E Payne (President And Ceo, 1.48Mn shares), Pharmaceutical Inc. Ultragenyx (Director, 1.40Mn shares), Pad Chivukula (Chief Scientific Officer Coo, 435.33K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Joseph E Payne | President And Ceo | 1,480,097 | 0 | 28 Nov, 2022 |
| Pharmaceutical Inc. Ultragenyx | 1,400,000 | 0 | 12 Aug, 2021 | |
| Pad Chivukula | Chief Scientific Officer Coo | 435,334 | 0 | 16 Oct, 2024 |
| Andy Sassine | Chief Financial Officer | 221,764 | 0 | 20 Aug, 2025 |
| Peter C Farrell | 55,741 | 0 | 18 Jun, 2024 | |
| Magda Marquet | 0 | 24,942 | 19 Dec, 2022 | |
| James F Barlow | 13,131 | 0 | 18 Jun, 2024 | |
| Jing L. Marantz | 3,131 | 0 | 18 Jun, 2024 | |
| John Markels | 3,131 | 0 | 18 Jun, 2024 | |
| Edward W Holmes | 3,131 | 0 | 18 Jun, 2024 | |
| Magda Marquet | 3,131 | 0 | 18 Jun, 2024 | |
| Keith C Kummerfeld | See Remarks | 950 | 0 | 18 Jul, 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 |
|---|---|---|---|---|---|---|---|---|
| 17 Dec, 2025 | Pad Chivukula | Employee Stock Option (right to buy) | A | 54,000 | $0.00 | 54,000 | D | A |
| 17 Dec, 2025 | Joseph E Payne | Employee Stock Option (right to buy) | A | 175,000 | $0.00 | 175,000 | D | A |
| 17 Dec, 2025 | Joseph Roberts | Employee Stock Option (right to buy) | A | 10,000 | $0.00 | 10,000 | D | A |
| 17 Dec, 2025 | Lance Kurata | Employee Stock Option (right to buy) | A | 54,000 | $0.00 | 54,000 | D | A |
| 15 Aug, 2025 | Andy Sassine | Common Stock | A | 1,238 | $16.56 | 221,764 | D | P |
| 15 Aug, 2025 | Andy Sassine | Common Stock | D | 1,238 | $16.56 | 221,764 | D | P |
| 09 Jun, 2025 | Jing L. Marantz | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 09 Jun, 2025 | Peter C Farrell | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 09 Jun, 2025 | John Markels | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 09 Jun, 2025 | Magda Marquet | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 09 Jun, 2025 | Moncef Slaoui | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 09 Jun, 2025 | James F Barlow | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 09 Jun, 2025 | Edward W Holmes | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 16 Dec, 2024 | Andy Sassine | Employee Stock Option (right to buy) | A | 60,000 | $0.00 | 60,000 | D | A |
| 16 Dec, 2024 | Pad Chivukula | Employee Stock Option (right to buy) | A | 60,000 | $0.00 | 60,000 | D | A |
| 16 Dec, 2024 | Lance Kurata | Employee Stock Option (right to buy) | A | 60,000 | $0.00 | 60,000 | D | A |
| 16 Dec, 2024 | Joseph E Payne | Employee Stock Option (right to buy) | A | 196,000 | $0.00 | 196,000 | D | A |
| 15 Oct, 2024 | Pad Chivukula | Common Stock | D | 12,000 | $20.76 | 435,334 | D | S |
| 19 Jun, 2024 | Moncef Slaoui | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 19 Jun, 2024 | Moncef Slaoui | Stock option (right to buy) | A | 14,794 | $0.00 | 14,794 | D | A |