Ionis Pharmaceuticals Inc (IONS) Insider Ownership

Historic Ownership Trends

Based on data from the past 90 days ending December 12, 2025, Ionis Pharmaceuticals's three largest insider shareholders are Chief Executive Officer Brett P Monia (179.57K shares), Director B Lynne Parshall (61.34K shares), EVP And Chief Development Officer Richard S Geary (59.66K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares Report Date
Stanley T Crooke Exec Chairman Of The Board 496,412 28 Jan, 2021
Brett P Monia Chief Executive Officer 179,572 08 Oct, 2025
Spencer R Berthelsen 156,013 17 Jul, 2025
Elizabeth L Hougen EVP And Finance & Cfo 110,500 01 Oct, 2025
C Frank Bennett EVP And Chief Scientific Officer 82,679 09 Sep, 2025
B Lynne Parshall 61,344 16 Oct, 2025
Richard S Geary EVP And Chief Development Officer 59,657 07 Nov, 2025
Frederick T Muto 59,597 19 Jul, 2022
Michael R Hayden 54,298 17 Jul, 2025
Patrick R. O'Neil EVP Clo & General Counsel 53,889 08 Oct, 2025
Joseph H Wender 52,035 20 Nov, 2025
Eugene Schneider EVP And CHF Clinical Develop Ofcr 51,507 04 Sep, 2025
Brian Birchler EVP And Corp And Development Ops 48,826 07 Nov, 2025
Joan E Herman 46,086 20 Nov, 2025
Joseph Loscalzo 36,330 03 Nov, 2025
Onaiza Cadoret-Manier EVP And CHF Gl Pdt Str & Oper Ofc 35,825 02 Feb, 2024
Joseph Baroldi EVP And Chief Business Officer 33,372 08 Oct, 2025
Eric Swayze EVP Research 30,709 08 Oct, 2025
Allene M. Diaz 18,368 26 Aug, 2025
Shannon L. Devers EVP And Chief Human Resources Ofc 17,494 28 Nov, 2025
Joseph Iii Klein 16,346 17 Nov, 2023
Peter N Reikes 14,222 19 Oct, 2021
Kyle Jenne EVP And CHF Gl Pdt Str Ofcr 11,199 17 Apr, 2025
Michael J. Yang 6,010 17 Jul, 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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
01 Dec, 2025 Joseph H Wender Common Stock D 20,571 $80.67 43,464 I S
01 Dec, 2025 Joseph H Wender Common Stock D 7,429 $81.23 36,035 I S
25 Nov, 2025 Joseph Iii Klein Common Stock A 4,000 $0.00 4,000 I M
25 Nov, 2025 Shannon L. Devers Common Stock A 16,777 $53.77 34,271 D M
25 Nov, 2025 Joseph Iii Klein Common Stock D 4,000 $80.00 0 I S
25 Nov, 2025 Shannon L. Devers Common Stock D 16,777 $80.91 17,494 D S
25 Nov, 2025 Joseph Iii Klein Common Stock A 4,000 $0.00 4,000 I M
25 Nov, 2025 Joseph Iii Klein Common Stock D 4,000 $80.00 0 I S
25 Nov, 2025 Joseph Iii Klein Common Stock A 4,000 $0.00 4,000 I M
25 Nov, 2025 Joseph Iii Klein Common Stock D 4,000 $80.00 0 I S
19 Nov, 2025 Joan E Herman Common Stock A 12,000 $40.05 58,086 D M
19 Nov, 2025 Joan E Herman Common Stock D 12,000 $72.13 46,086 D S
19 Nov, 2025 Joan E Herman Common Stock A 32,000 $63.90 78,086 D M
19 Nov, 2025 Joan E Herman Common Stock D 32,000 $72.13 46,086 D S
18 Nov, 2025 Joseph H Wender Common Stock A 16,000 $24.42 16,000 D M
06 Nov, 2025 Brian Birchler Common Stock D 8,000 $76.17 48,826 D S
05 Nov, 2025 Richard S Geary Common Stock A 800 $56.78 60,457 D M
05 Nov, 2025 Richard S Geary Common Stock D 800 $75.01 59,657 D S
05 Nov, 2025 Richard S Geary Common Stock A 801 $60.89 60,458 D M
05 Nov, 2025 Richard S Geary Common Stock D 801 $75.01 59,657 D S