SEC Form 4 · Updated Daily
IONS
— IONIS PHARMACEUTICALS, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| Monia Brett P | Director · Officer | 242,760 | 2026-08-31 | J |
| BERTHELSEN SPENCER R | Director | 161,233 | 2026-07-15 | M |
| Birchler Brian | Officer | 102,883 | 2026-08-31 | J |
| HOUGEN ELIZABETH L | Officer | 82,660 | 2026-03-17 | S |
| Schneider Eugene | Officer | 77,114 | 2026-06-26 | S |
| BENNETT C FRANK | Officer | 60,128 | 2026-08-31 | J |
| O'NEIL PATRICK R. | Officer | 59,205 | 2026-08-31 | J |
| PARSHALL B LYNNE | Director | 51,344 | 2026-04-15 | S |
| HERMAN JOAN E | Director | 51,306 | 2026-07-15 | M |
| LOSCALZO JOSEPH | Director | 36,330 | 2026-05-04 | S |
| Hayden Michael R | Director | 24,000 | 2026-07-31 | P |
| Jenne Kyle | Officer | 23,713 | 2026-04-16 | S |
| Kordasiewicz Holly B. | Officer | 22,096 | 2026-07-07 | S |
| Swayze Eric | Officer | 21,759 | 2026-06-25 | S |
| Devers Shannon L. | Officer | 16,348 | 2026-04-02 | S |
| KLEIN JOSEPH III | Director | 11,014 | 2026-07-01 | S |
| Baroldi Joseph | Officer | 4,669 | 2026-06-26 | S |
| Diaz Allene M. | Director | 3,811 | 2026-07-07 | S |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-31 | Birchler Brian | J | 58 | $51.31 | 102,883 |
| 2026-08-31 | Monia Brett P | J | 98 | $51.31 | 242,760 |
| 2026-08-31 | O'NEIL PATRICK R. | J | 63 | $51.31 | 59,205 |
| 2026-08-31 | BENNETT C FRANK | J | 110 | $51.31 | 60,128 |
| 2026-07-31 | Hayden Michael R | Open-market buy | 5,000 | $51.60 | 24,000 |
| 2026-07-30 | Hayden Michael R | Open-market buy | 15,000 | $53.38 | 19,000 |
| 2026-07-15 | BERTHELSEN SPENCER R | Option exercise (derivative) | 5,220 | $0.00 | 2,301 |
| 2026-07-15 | BERTHELSEN SPENCER R | Option exercise | 5,220 | $0.00 | 161,233 |
| 2026-07-15 | HERMAN JOAN E | Option exercise (derivative) | 5,220 | $0.00 | 2,301 |
| 2026-07-15 | HERMAN JOAN E | Option exercise | 5,220 | $0.00 | 51,306 |
| 2026-07-15 | HANTSON LUDWIG | Grant / award (derivative) | 3,399 | $0.00 | 3,399 |
| 2026-07-15 | Reikes Peter N | Grant / award (derivative) | 3,399 | $0.00 | 3,399 |
| 2026-07-07 | Kordasiewicz Holly B. | Open-market sale | 362 | $84.30 | 22,096 |
| 2026-07-07 | Diaz Allene M. | Option exercise (derivative) | 10,111 | $0.00 | 0 |
| 2026-07-07 | Diaz Allene M. | Open-market sale | 10,111 | $85.42 | 3,811 |
| 2026-07-07 | Diaz Allene M. | Option exercise | 10,111 | $47.11 | 13,922 |
| 2026-07-07 | BENNETT C FRANK | J (derivative) | 15,000 | $0.00 | 12,109 |
| 2026-07-07 | BENNETT C FRANK | Open-market sale | 15,000 | $85.46 | 0 |
| 2026-07-07 | BENNETT C FRANK | J | 15,000 | $0.00 | 15,000 |
| 2026-07-07 | BENNETT C FRANK | Open-market sale | 5,536 | $83.58 | 75,018 |
| 2026-07-01 | BERTHELSEN SPENCER R | Grant / award (derivative) | 2,301 | $0.00 | 7,521 |
| 2026-07-01 | BERTHELSEN SPENCER R | Grant / award (derivative) | 5,369 | $0.00 | 5,369 |
| 2026-07-01 | Diaz Allene M. | Grant / award (derivative) | 2,301 | $0.00 | 7,521 |
| 2026-07-01 | Diaz Allene M. | Grant / award (derivative) | 5,369 | $0.00 | 5,369 |
| 2026-07-01 | Hayden Michael R | Grant / award (derivative) | 2,301 | $0.00 | 12,198 |
| 2026-07-01 | Hayden Michael R | Grant / award (derivative) | 5,369 | $0.00 | 5,369 |
| 2026-07-01 | KLEIN JOSEPH III | Grant / award (derivative) | 2,301 | $0.00 | 16,277 |
| 2026-07-01 | KLEIN JOSEPH III | Grant / award (derivative) | 5,369 | $0.00 | 5,369 |
| 2026-07-01 | KLEIN JOSEPH III | Option exercise (derivative) | 11,518 | $0.00 | 0 |
| 2026-07-01 | KLEIN JOSEPH III | Open-market sale | 11,419 | $79.04 | 11,014 |
| 2026-07-01 | KLEIN JOSEPH III | Open-market sale | 99 | $79.45 | 22,433 |
| 2026-07-01 | KLEIN JOSEPH III | Option exercise | 11,518 | $39.94 | 22,532 |
| 2026-07-01 | HERMAN JOAN E | Grant / award (derivative) | 2,301 | $0.00 | 7,521 |
| 2026-07-01 | HERMAN JOAN E | Grant / award (derivative) | 5,369 | $0.00 | 5,369 |
| 2026-07-01 | LOSCALZO JOSEPH | Grant / award (derivative) | 2,301 | $0.00 | 7,521 |
| 2026-07-01 | LOSCALZO JOSEPH | Grant / award (derivative) | 5,369 | $0.00 | 5,369 |
| 2026-07-01 | YANG MICHAEL J. | Grant / award (derivative) | 2,301 | $0.00 | 9,451 |
| 2026-07-01 | YANG MICHAEL J. | Grant / award (derivative) | 5,369 | $0.00 | 5,369 |
| 2026-06-26 | Monia Brett P | Option exercise (derivative) | 50,000 | $0.00 | 99,872 |
| 2026-06-26 | Monia Brett P | Open-market sale | 50,000 | $80.59 | 245,571 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.