IONS's three largest insider shareholders as of May 30, 2026 are Brett P Monia (Chief Executive Officer, 242.66K shares), Spencer R Berthelsen (Director, 156.01K shares), Elizabeth L Hougen (Evp, Finance Cfo, 82.66K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Joseph H Wender | - | 0 | 36,035 | 03 Dec, 2025 |
| B Lynne Parshall | Coo | 51,344 | 0 | 17 Apr, 2026 |
| C Frank Bennett | Evp, Chief Scientific Officer | 80,554 | 0 | 05 Mar, 2026 |
| Elizabeth L Hougen | Evp, Finance Cfo | 82,660 | 0 | 18 Mar, 2026 |
| Spencer R Berthelsen | - | 156,013 | 0 | 17 Jul, 2025 |
| Frederick T Muto | - | 59,597 | 0 | 18 Jul, 2022 |
| Joan E Herman | - | 46,086 | 0 | 20 Nov, 2025 |
| Michael R Hayden | - | 54,298 | 0 | 17 Jul, 2025 |
| Richard S Geary | Evp, Chief Development Officer | 59,657 | 0 | 07 Nov, 2025 |
| Brett P Monia | Chief Executive Officer | 242,662 | 0 | 11 Mar, 2026 |
| Patrick R. O'Neil | Evp Clo General Counsel | 62,211 | 0 | 11 Mar, 2026 |
| Michael J. Yang | - | 7,940 | 0 | 20 Jan, 2026 |
| Peter N Reikes | - | 14,222 | 0 | 19 Oct, 2021 |
| Allene M. Diaz | - | 3,811 | 0 | 05 Mar, 2026 |
| Eric Swayze | Evp Research | 32,361 | 0 | 03 Mar, 2026 |
| Kyle Jenne | Evp, Chf Gl Pdt Str Ofcr | 23,713 | 0 | 17 Apr, 2026 |
| Onaiza Cadoret-Manier | Evp, Chf Gl Pdt Str Oper Ofc | 35,825 | 0 | 02 Feb, 2024 |
| Joseph Baroldi | Evp, Chief Business Officer | 41,317 | 4,347 | 05 Mar, 2026 |
| Eugene Schneider | Evp, Chf Clinical Develop Ofcr | 63,890 | 0 | 23 Mar, 2026 |
| Brian Birchler | Evp, Corp And Development Ops | 66,598 | 0 | 03 Mar, 2026 |
| Shannon L. Devers | Evp, Chief Human Resources Ofc | 16,348 | 0 | 02 Apr, 2026 |
| Holly B. Kordasiewicz | Evp, Chief Development Officer | 14,718 | 0 | 20 Jan, 2026 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 15 Apr, 2026 | Kyle Jenne | Common Stock | A | 12,226 | $0.00 | 28,615 | D | M |
| 15 Apr, 2026 | B Lynne Parshall | Common Stock | D | 4,466 | $76.19 | 51,878 | D | S |
| 16 Apr, 2026 | Kyle Jenne | Common Stock | D | 4,902 | $75.17 | 23,713 | D | S |
| 15 Apr, 2026 | B Lynne Parshall | Common Stock | D | 534 | $76.97 | 51,344 | D | S |
| 15 Apr, 2026 | Kyle Jenne | Restricted Stock Unit | D | 12,226 | $0.00 | 74,402 | D | M |
| 02 Apr, 2026 | Shannon L. Devers | Common Stock | D | 6,193 | $74.05 | 16,348 | D | S |
| 19 Mar, 2026 | Eugene Schneider | Common Stock | D | 5,812 | $70.97 | 63,890 | D | S |
| 19 Mar, 2026 | Eugene Schneider | Common Stock | D | 5,812 | $70.97 | 63,890 | D | S |
| 19 Mar, 2026 | Eugene Schneider | Common Stock | D | 5,812 | $70.97 | 63,890 | D | S |
| 16 Mar, 2026 | Elizabeth L Hougen | Common Stock | A | 60,299 | $60.89 | 193,180 | D | M |
| 16 Mar, 2026 | Elizabeth L Hougen | Common Stock | A | 61,041 | $56.78 | 254,221 | D | M |
| 16 Mar, 2026 | Elizabeth L Hougen | Common Stock | A | 33,118 | $32.60 | 287,339 | D | M |
| 16 Mar, 2026 | Elizabeth L Hougen | Common Stock | A | 20,541 | $37.58 | 307,880 | D | M |
| 16 Mar, 2026 | Elizabeth L Hougen | Common Stock | D | 205,608 | $72.38 | 102,272 | D | S |
| 16 Mar, 2026 | Elizabeth L Hougen | Common Stock | D | 9,440 | $72.77 | 92,832 | D | S |
| 17 Mar, 2026 | Elizabeth L Hougen | Common Stock | D | 10,172 | $73.21 | 82,660 | D | S |
| 16 Mar, 2026 | Elizabeth L Hougen | Non-Qualified Stock Option (right to buy) | D | 33,118 | $0.00 | 0 | D | M |
| 16 Mar, 2026 | Elizabeth L Hougen | Non-Qualified Stock Option (right to buy) | D | 20,541 | $0.00 | 5,405 | D | M |
| 16 Mar, 2026 | Elizabeth L Hougen | Non-Qualified Stock Option (right to buy) | D | 61,041 | $0.00 | 0 | D | M |
| 16 Mar, 2026 | Elizabeth L Hougen | Non-Qualified Stock Option (right to buy) | D | 60,299 | $0.00 | 0 | D | M |