IONS's three largest insider shareholders as of March 23, 2026 are Brett P Monia (Chief Executive Officer, 242.66K shares), Spencer R Berthelsen (Director, 156.01K shares), Elizabeth L Hougen (Evp, Finance Cfo, 132.88K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Brett P Monia | Chief Executive Officer | 242,662 | 0 | 11 Mar, 2026 |
| Elizabeth L Hougen | Evp, Finance Cfo | 82,660 | 0 | 18 Mar, 2026 |
| Eugene Schneider | Evp, Chf Clinical Develop Ofcr | 63,890 | 0 | 23 Mar, 2026 |
| Patrick R. O'Neil | Evp Clo General Counsel | 62,211 | 0 | 11 Mar, 2026 |
| Frederick T Muto | 59,597 | 0 | 18 Jul, 2022 | |
| B Lynne Parshall | 56,344 | 0 | 12 Feb, 2026 | |
| Joseph Loscalzo | 36,330 | 0 | 05 Mar, 2026 | |
| Joseph H Wender | 0 | 36,035 | 03 Dec, 2025 | |
| Eric Swayze | Evp Research | 32,361 | 0 | 03 Mar, 2026 |
| Kyle Jenne | Evp, Chf Gl Pdt Str Ofcr | 16,389 | 0 | 11 Mar, 2026 |
| Joseph H Wender | 16,000 | 0 | 19 Nov, 2025 | |
| Holly B. Kordasiewicz | Evp, Chief Development Officer | 14,718 | 0 | 20 Jan, 2026 |
| Peter N Reikes | 14,222 | 0 | 19 Oct, 2021 | |
| Joseph Iii Klein | 11,014 | 0 | 05 Mar, 2026 | |
| Michael J. Yang | 7,940 | 0 | 20 Jan, 2026 | |
| Eric Swayze | Evp Research | 0 | 318 | 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 |
|---|---|---|---|---|---|---|---|---|
| 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 |
| 09 Mar, 2026 | Brett P Monia | Common Stock | A | 40,822 | $60.89 | 295,803 | D | M |
| 09 Mar, 2026 | Patrick R. O'Neil | Common Stock | D | 10,148 | $75.25 | 62,211 | D | S |
| 10 Mar, 2026 | Kyle Jenne | Common Stock | A | 32,602 | $46.10 | 48,991 | D | M |
| 09 Mar, 2026 | Brett P Monia | Common Stock | A | 73,529 | $60.89 | 369,332 | D | M |
| 10 Mar, 2026 | Kyle Jenne | Common Stock | D | 21,191 | $75.50 | 27,800 | D | S |
| 09 Mar, 2026 | Brett P Monia | Common Stock | D | 7,382 | $74.11 | 361,950 | D | S |
| 10 Mar, 2026 | Kyle Jenne | Common Stock | D | 16,086 | $76.30 | 11,714 | D | S |
| 09 Mar, 2026 | Brett P Monia | Common Stock | D | 117,604 | $75.26 | 244,346 | D | S |