Institutional shares held 148 Million
1.72M calls
722K puts
Total value of holdings $11B
$128M calls
$53.5M puts
Market Cap $10.4B
141,940,992 Shares Out.
Institutional ownership 104.62%
# of Institutions 445


Latest Institutional Activity in IONS

Top Purchases

Q3 2025
Massachusetts Financial Services CO Shares Held: 863K ($63.4M)
Q3 2025
Assenagon Asset Management S.A. Shares Held: 312K ($23M)
Q3 2025
Capricorn Fund Managers LTD Shares Held: 163K ($12M)
Q3 2025
Jpmorgan Chase & CO Shares Held: 544K ($40M)
Q3 2025
Skandinaviska Enskilda Banken Ab (Publ) Shares Held: 156K ($11.5M)

Top Sells

Q3 2025
Abrdn PLC Shares Held: 87.9K ($6.47M)
Q3 2025
Bnp Paribas Asset Management Holding S.A. Shares Held: 1.06M ($77.9M)
Q3 2025
Vanguard Group Inc Shares Held: 16.5M ($1.21B)
Q3 2025
Great Lakes Advisors, LLC Shares Held: 187K ($13.8M)
Q3 2025
Teacher Retirement System Of Texas Shares Held: 474K ($34.9M)

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
1.28M Shares
From 34 Insiders
Exercise of conversion of derivative security 1.21M shares
Open market or private purchase 20K shares
Grant, award, or other acquisition 48.5K shares
Other acquisition or disposition 3.62K shares
Sell / Disposition
1.33M Shares
From 17 Insiders
Open market or private sale 1.32M shares
Exercise of conversion of derivative security 12.9K shares

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