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 |
|---|---|---|---|---|---|---|
| Birchler Brian | EVP | SELL | $500K+ | 8K | $75.11 | Jan 21, 2026 |
| Birchler Brian | EVP | EXERCISE | N/A | 20K | — | Jan 21, 2026 |
| BENNETT C FRANK | EVP | SELL | $500K+ | 9K | $75.15 | Jan 21, 2026 |
| BENNETT C FRANK | EVP | EXERCISE | N/A | 21K | — | Jan 21, 2026 |
| Baroldi Joseph | EVP | EXERCISE | N/A | 20K | — | Jan 21, 2026 |
| Baroldi Joseph | EVP | SELL | $500K+ | 8K | $75.75 | Jan 21, 2026 |
| Devers Shannon L. | EVP | SELL | $1M+ | 44K | $85.08 | Jan 9, 2026 |
| Devers Shannon L. | EVP | EXERCISE | $1M+ | 44K | $51.25 | Jan 9, 2026 |
| Swayze Eric | EVP Research | SELL | $1M+ | 23K | $79.12 | Jan 6, 2026 |
| Swayze Eric | EVP Research | EXERCISE | $1M+ | 23K | $60.89 | Jan 6, 2026 |
| WENDER JOSEPH H | Director | SELL | $1M+ | 28K | $80.82 | Dec 4, 2025 |
| KLEIN JOSEPH III | Director | SELL | $500K+ | 12K | $80.00 | Nov 28, 2025 |
| KLEIN JOSEPH III | Director | EXERCISE | N/A | 12K | — | Nov 28, 2025 |
| Devers Shannon L. | EVP | SELL | $1M+ | 17K | $80.91 | Nov 28, 2025 |
| Devers Shannon L. | EVP | EXERCISE | $500K+ | 17K | $53.77 | Nov 28, 2025 |
| HERMAN JOAN E | Director | EXERCISE | $1M+ | 44K | $57.40 | Nov 20, 2025 |
| HERMAN JOAN E | Director | SELL | $1M+ | 44K | $72.13 | Nov 20, 2025 |
| Birchler Brian | EVP | SELL | $500K+ | 8K | $76.17 | Nov 7, 2025 |
| Geary Richard S | EVP | SELL | $1M+ | 35K | $75.69 | Nov 7, 2025 |
| Geary Richard S | EVP | EXERCISE | $1M+ | 35K | $59.05 | Nov 7, 2025 |
| WENDER JOSEPH H | Director | SELL | $1M+ | 28K | $74.02 | Nov 4, 2025 |
| LOSCALZO JOSEPH | Director | SELL | $1M+ | 16K | $75.10 | Nov 4, 2025 |
| LOSCALZO JOSEPH | Director | EXERCISE | $500K+ | 16K | $52.22 | Nov 4, 2025 |
| Geary Richard S | EVP | SELL | $1M+ | 91K | $75.11 | Nov 4, 2025 |
| Geary Richard S | EVP | EXERCISE | $1M+ | 71K | $58.84 | Nov 4, 2025 |
| WENDER JOSEPH H | Director | SELL | $1M+ | 17K | $65.50 | Oct 2, 2025 |
| Swayze Eric | EVP Research | EXERCISE | $1M+ | 27K | $53.77 | Oct 2, 2025 |
| Swayze Eric | EVP Research | SELL | $1M+ | 27K | $66.16 | Oct 2, 2025 |
| O'NEIL PATRICK R. | EVP CLO & General … | SELL | $1M+ | 65K | $67.69 | Oct 2, 2025 |
| O'NEIL PATRICK R. | EVP CLO & General … | EXERCISE | $1M+ | 65K | $58.97 | Oct 2, 2025 |
| Baroldi Joseph | EVP | EXERCISE | $100K–$500K | 15K | $31.80 | Oct 2, 2025 |
| Baroldi Joseph | EVP | SELL | $1M+ | 15K | $68.01 | Oct 2, 2025 |
| O'NEIL PATRICK R. | EVP CLO & General … | SELL | $1M+ | 25K | $64.62 | Oct 1, 2025 |
| O'NEIL PATRICK R. | EVP CLO & General … | EXERCISE | $1M+ | 25K | $56.78 | Oct 1, 2025 |
| Geary Richard S | EVP | SELL | $1M+ | 58K | $65.24 | Oct 1, 2025 |
| Geary Richard S | EVP | EXERCISE | $1M+ | 58K | $53.77 | Oct 1, 2025 |
| HOUGEN ELIZABETH L | EVP, Finance & CFO | EXERCISE | $1M+ | 50K | $53.77 | Oct 1, 2025 |
| HOUGEN ELIZABETH L | EVP, Finance & CFO | SELL | $1M+ | 50K | $65.26 | Oct 1, 2025 |
| O'NEIL PATRICK R. | EVP CLO & General … | SELL | $100K–$500K | 2K | $64.58 | Sep 16, 2025 |
| O'NEIL PATRICK R. | EVP CLO & General … | EXERCISE | $50K–$100K | 2K | $56.78 | Sep 16, 2025 |
| Baroldi Joseph | EVP | EXERCISE | $100K–$500K | 12K | $31.80 | Sep 11, 2025 |
| Baroldi Joseph | EVP | SELL | $500K+ | 12K | $62.16 | Sep 11, 2025 |
| O'NEIL PATRICK R. | EVP CLO & General … | EXERCISE | $1M+ | 21K | $60.69 | Sep 11, 2025 |
| O'NEIL PATRICK R. | EVP CLO & General … | SELL | $1M+ | 21K | $64.56 | Sep 11, 2025 |
| Baroldi Joseph | EVP | EXERCISE | $1K–$15K | 250 | $31.80 | Sep 9, 2025 |
| Baroldi Joseph | EVP | SELL | $15K–$50K | 250 | $62.00 | Sep 9, 2025 |
| BENNETT C FRANK | EVP | SELL | $100K–$500K | 6K | $59.60 | Sep 9, 2025 |
| Swayze Eric | EVP Research | SELL | $500K+ | 11K | $49.67 | Sep 5, 2025 |
| WENDER JOSEPH H | Director | SELL | $1M+ | 28K | $57.58 | Sep 5, 2025 |
| PARSHALL B LYNNE | Director | SELL | $1M+ | 20K | $50.91 | Sep 5, 2025 |
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