ARCT's three largest insider shareholders as of May 30, 2026 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 |
|---|---|---|---|---|
| Peter C Farrell | - | 55,741 | 0 | 18 Jun, 2024 |
| James F Barlow | - | 13,131 | 0 | 18 Jun, 2024 |
| Edward W Holmes | - | 3,131 | 0 | 18 Jun, 2024 |
| Andy Sassine | Chief Financial Officer | 221,764 | 0 | 20 Aug, 2025 |
| Pharmaceutical Inc. Ultragenyx | - | 1,400,000 | 0 | 12 Aug, 2021 |
| Magda Marquet | - | 0 | 24,942 | 19 Dec, 2022 |
| Joseph E Payne | President And Ceo | 1,480,097 | 0 | 28 Nov, 2022 |
| Pad Chivukula | Chief Scientific Officer Coo | 435,334 | 0 | 16 Oct, 2024 |
| Keith C Kummerfeld | - | 950 | 0 | 18 Jul, 2023 |
| John Markels | - | 3,131 | 0 | 18 Jun, 2024 |
| Jing L. Marantz | - | 3,131 | 0 | 18 Jun, 2024 |
* 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 | Lance Kurata | Employee Stock Option (right to buy) | A | 54,000 | $0.00 | 54,000 | 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 |
| 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 | Pad Chivukula | Employee Stock Option (right to buy) | A | 54,000 | $0.00 | 54,000 | D | A |
| 17 Dec, 2025 | Joseph Roberts | Employee Stock Option (right to buy) | A | 10,000 | $0.00 | 10,000 | 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 | 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 |
| 15 Aug, 2025 | Andy Sassine | Common Stock | D | 1,238 | $16.56 | 221,764 | D | P |
| 09 Jun, 2025 | Peter C Farrell | 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 | Moncef Slaoui | Stock option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 09 Jun, 2025 | Jing L. Marantz | 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 | Edward W Holmes | 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 | James F Barlow | 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 |