Institutional shares held 155 Million
2.69M calls
1.03M puts
Total value of holdings $11.1B
$192M calls
$73.5M puts
Market Cap $10.2B
141,940,992 Shares Out.
Institutional ownership 109.06%
# of Institutions 506


Latest Institutional Activity in IONS

Top Purchases

Q4 2025
Davenport & CO LLC Shares Held: 218K ($15.6M)
Q4 2025
Sg Americas Securities, LLC Shares Held: 33.4K ($2.39M)
Q4 2025
Avanza Fonder Ab Shares Held: 3.6K ($257K)
Q4 2025
Park Avenue Securities LLC Shares Held: 3.57K ($256K)
Q4 2025
Everhart Financial Group, Inc. Shares Held: 3.47K ($248K)

Top Sells

Q4 2025
Assenagon Asset Management S.A. Shares Held: 29.3K ($2.1M)
Q4 2025
Significant Wealth Partners LLC Shares Held: 6.76K ($484K)
Q4 2025
Sicart Associates LLC Shares Held: 164K ($11.7M)
Q4 2025
Mitchell & Pahl Private Wealth, LLC Shares Held: 3.38K ($242K)
Q4 2025
Global X Japan Co., Ltd. Shares Held: 171 ($12.2K)

About IONS

Ionis Pharmaceuticals, Inc. discovers and develops RNA-targeted therapeutics in the United States. The company offers SPINRAZA for spinal muscular atrophy (SMA) in pediatric and adult patients; TEGSEDI, an injection for the treatment of polyneuropathy of hereditary transthyretin-mediated amyloidosis in adults; and WAYLIVRA, a treatment for familial chylomicronemia syndrome and familial partial lipodystrophy. It also develops medicines for various indications that are in phase 3 study, including Eplontersen as a monthly self-administered subcutaneous injection to treat all types of TTR amyloidosis; Olezarsen for patients with severe hypertriglyceridemia (SHTG); Donidalorsen for patients with hereditary angioedema; ION363 for patients with amyotrophic lateral sclerosis; Pelacarsen for patients with established cardiovascular disease and elevated lipoprotein(a); and Tofersen to inhibit the production of superoxide dismutase 1. In addition, the company develops medicines for metabolic diseases, infectious diseases, renal diseases, ophthalmic diseases, and cancer. It has a strategic collaboration with Biogen Inc.; and collaboration and license agreement with AstraZeneca, Bayer AG, GlaxoSmithKline plc, Novartis AG, Roche, Janssen Biotech, Inc., and Flamingo Therapeutics, Inc. Ionis Pharmaceuticals, Inc. was founded in 1989 and is based in Carlsbad, California.


Insider Transactions at IONS

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
1.2M Shares
From 34 Insiders
Exercise of conversion of derivative security 1.13M shares
Open market or private purchase 15K shares
Grant, award, or other acquisition 48.5K shares
Other acquisition or disposition 3.62K shares
Sell / Disposition
1.48M Shares
From 18 Insiders
Open market or private sale 1.47M shares
Exercise of conversion of derivative security 12.9K shares

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