IONIS PHARMACEUTICALS INC
Total Trades
283
Buys
2
Sells
161
Largest Trade
N/A
Insiders
21
Institutional Funds
410
Inst. Value
$1M+
Activist Filings
23
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Geary Richard S | EVP | SELL | $100K–$500K | 7K | $50.42 | Jan 18, 2024 |
| BENNETT C FRANK | EVP | EXERCISE | N/A | 18K | — | Jan 18, 2024 |
| BENNETT C FRANK | EVP | SELL | $100K–$500K | 7K | $50.42 | Jan 18, 2024 |
| Baroldi Joseph | EVP | EXERCISE | N/A | 5K | — | Jan 18, 2024 |
| Baroldi Joseph | EVP | SELL | $100K–$500K | 2K | $50.42 | Jan 18, 2024 |
| Schneider Eugene | EVP | EXERCISE | $100K–$500K | 8K | $32.60 | Jan 18, 2024 |
| Schneider Eugene | EVP | SELL | $100K–$500K | 8K | $53.50 | Jan 18, 2024 |
| Swayze Eric | EVP Research | EXERCISE | $1M+ | 27K | $47.34 | Jan 2, 2024 |
| Swayze Eric | EVP Research | SELL | $1M+ | 27K | $50.19 | Jan 2, 2024 |
| O'NEIL PATRICK R. | EVP CLO & General … | EXERCISE | $500K+ | 21K | $47.34 | Dec 29, 2023 |
| O'NEIL PATRICK R. | EVP CLO & General … | SELL | $1M+ | 21K | $51.46 | Dec 29, 2023 |
| PARSHALL B LYNNE | Director | EXERCISE | $1M+ | 118K | $47.34 | Dec 29, 2023 |
| PARSHALL B LYNNE | Director | SELL | $1M+ | 118K | $50.48 | Dec 29, 2023 |
| Schneider Eugene | EVP | SELL | $1M+ | 25K | $51.46 | Dec 29, 2023 |
| Schneider Eugene | EVP | EXERCISE | $1M+ | 25K | $47.34 | Dec 29, 2023 |
| BENNETT C FRANK | EVP | SELL | $1M+ | 23K | $49.39 | Dec 23, 2023 |
| BENNETT C FRANK | EVP | EXERCISE | $1M+ | 23K | $47.34 | Dec 23, 2023 |
| Geary Richard S | EVP | SELL | $500K+ | 11K | $49.50 | Dec 23, 2023 |
| Geary Richard S | EVP | EXERCISE | $500K+ | 11K | $47.34 | Dec 23, 2023 |
| Monia Brett P | CEO | EXERCISE | $1M+ | 24K | $47.34 | Dec 23, 2023 |
| Monia Brett P | CEO | SELL | $1M+ | 24K | $49.38 | Dec 23, 2023 |
| KLEIN JOSEPH III | Director | SELL | $100K–$500K | 2K | $50.00 | Nov 17, 2023 |
| Swayze Eric | EVP Research | SELL | $1K–$15K | 52 | $47.95 | Oct 18, 2023 |
| Swayze Eric | EVP Research | EXERCISE | N/A | 125 | — | Oct 18, 2023 |
| Monia Brett P | CEO | SELL | $100K–$500K | 4K | $46.00 | Oct 16, 2023 |
| BENNETT C FRANK | EVP | SELL | $100K–$500K | 4K | $46.50 | Sep 29, 2023 |
| PARSHALL B LYNNE | Director | SELL | $100K–$500K | 10K | $45.13 | Sep 28, 2023 |
| KLEIN JOSEPH III | Director | SELL | $50K–$100K | 2K | $45.13 | Sep 28, 2023 |
| Diaz Allene M. | Director | SELL | $15K–$50K | 657 | $41.05 | Aug 3, 2023 |
| KLEIN JOSEPH III | Director | SELL | $100K–$500K | 4K | $42.00 | Jul 19, 2023 |
| KLEIN JOSEPH III | Director | EXERCISE | N/A | 7K | — | Jul 19, 2023 |
| Monia Brett P | CEO | SELL | $500K+ | 19K | $42.25 | Jul 11, 2023 |
| O'NEIL PATRICK R. | EVP CLO & General … | SELL | $50K–$100K | 2K | $41.70 | May 25, 2023 |
| Monia Brett P | CEO | SELL | $100K–$500K | 5K | $40.14 | May 25, 2023 |
| Birchler Brian | EVP | EXERCISE | N/A | 2K | — | Apr 20, 2023 |
| Birchler Brian | EVP | SELL | $15K–$50K | 672 | $36.50 | Apr 20, 2023 |
| Cadoret-Manier Onaiza | EVP | SELL | $50K–$100K | 3K | $36.50 | Apr 20, 2023 |
| Cadoret-Manier Onaiza | EVP | EXERCISE | N/A | 6K | — | Apr 20, 2023 |
| Baroldi Joseph | EVP | SELL | $100K–$500K | 4K | $36.50 | Apr 20, 2023 |
| Baroldi Joseph | EVP | EXERCISE | N/A | 11K | — | Apr 20, 2023 |
| Swayze Eric | EVP Research | GRANT | N/A | 4K | — | Feb 7, 2023 |
| Swayze Eric | EVP Research | SELL | $50K–$100K | 2K | $40.79 | Feb 7, 2023 |
| Schneider Eugene | EVP | SELL | $50K–$100K | 1K | $40.67 | Feb 7, 2023 |
| Schneider Eugene | EVP | GRANT | N/A | 4K | — | Feb 7, 2023 |
| O'NEIL PATRICK R. | EVP CLO & General … | GRANT | N/A | 4K | — | Feb 7, 2023 |
| O'NEIL PATRICK R. | EVP CLO & General … | SELL | $50K–$100K | 2K | $40.86 | Feb 7, 2023 |
| Monia Brett P | CEO | SELL | $1M+ | 25K | $40.69 | Feb 7, 2023 |
| Monia Brett P | CEO | GRANT | N/A | 49K | — | Feb 7, 2023 |
| HOUGEN ELIZABETH L | EVP, Finance & CFO | SELL | $50K–$100K | 2K | $40.59 | Feb 7, 2023 |
| HOUGEN ELIZABETH L | EVP, Finance & CFO | GRANT | N/A | 4K | — | Feb 7, 2023 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 410 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| Capital World Investors | 18.0M | $1M+ | SH |
| STATE STREET CORP | 4.0M | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 2.8M | $1M+ | SH |
| Tweedy, Browne Co LLC | 2.5M | $1M+ | SH |
| Deep Track Capital, LP | 1.7M | $1M+ | SH |
| AMERICAN CENTURY COMPANIES INC | 1.6M | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.5M | $1M+ | SH |
| Pictet Asset Management Holding SA | 1.4M | $1M+ | SH |
| Connor, Clark & Lunn Investment Management Ltd. | 1.1M | $1M+ | SH |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.1M | $1M+ | SH |
| BNP Paribas Asset Management Holding S.A. | 955K | $1M+ | SH |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 865K | $1M+ | SH |
| NOMURA HOLDINGS INC | 849K | $1M+ | SH |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 809K | $1M+ | SH |
| TD ASSET MANAGEMENT INC | 773K | $1M+ | SH |
| GW&K Investment Management, LLC | 742K | $1M+ | SH |
| Candriam S.C.A. | 678K | $1M+ | SH |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | 585K | $1M+ | SH |
| EVENTIDE ASSET MANAGEMENT, LLC | 575K | $1M+ | SH |
| GOLDMAN SACHS GROUP INC | 553K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Jan 8, 2026
11.1%
18.0M shares
T. Rowe Price Investment Management, Inc.
SC 13G/A · Nov 14, 2025
8.3%
13.2M shares
Wellington Management Group LLP
SC 13G/A · Aug 12, 2025
4.3%
6.9M shares
SC 13G/A · Apr 17, 2025
5.7%
9.1M shares
SC 13G · Feb 13, 2025
7.3%
11.5M shares
T. Rowe Price Investment Management, Inc.
SC 13G/A · Feb 7, 2025
10.0%
15.9M shares
SC 13G/A · Jan 8, 2025
10.4%
16.5M shares
SC 13G/A · Nov 15, 2024
5.0%
7 shares
T. Rowe Price Investment Management, Inc. 85-4328500
SC 13G/A · Nov 14, 2024
9.0%
14.2M shares
Wellington Management Group LLP
SC 13G · Nov 8, 2024
5.8%
9.1M shares
T. Rowe Price Investment Management, Inc. 85-4328500
SC 13G · Feb 14, 2024
9.2%
13.2M shares
The Vanguard Group - 23-1945930
SC 13G/A · Feb 13, 2024
9.9%
14.2M shares
SC 13G/A · Feb 13, 2024
6.0%
8.6M shares
SC 13G/A · Jan 26, 2024
6.3%
9.1M shares
The Vanguard Group - 23-1945930
SC 13G/A · Jun 9, 2023
10.1%
14.4M shares
SC 13G/A · Feb 14, 2023
6.8%
9.6M shares
T. Rowe Price Investment Management, Inc. 85-4328500
SC 13G · Feb 14, 2023
8.2%
11.7M shares
SC 13G/A · Jan 31, 2023
6.5%
9.2M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Aug 10, 2022
3.3%
4.8M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Apr 11, 2022
10.1%
14.4M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Feb 14, 2022
8.8%
12.5M shares
SC 13G/A · Feb 11, 2022
7.2%
10.2M shares
SC 13G · Feb 1, 2022
6.0%
8.5M shares