Who Owns Ionis Pharmaceuticals, Inc. (IONS)?Hedge Fund & Institutional Holders
Institutional Holders
7
as of Q4 2025
Total Institutional Value
$6.00000049990004e+38T
% of Float Held
5.1062608464347714e+26%
QoQ Change in Holders
+0 / -0
Price History
Top Institutional Holders(Q4 2025)
| # | Fund | Shares | Value | % of Portfolio | Type |
|---|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | 82,600 | $6.0B | 3.38% | Put |
| 2 | GROUP ONE TRADING LLC | 63,200 | $5.0B | 8.73% | Call |
| 3 | SIMPLEX TRADING, LLC | 56,600 | $4.0B | 2.25% | Call |
| 4 | GROUP ONE TRADING LLC | 32,300 | $2.6B | 4.46% | Put |
| 5 | IMC-Chicago, LLC | 23,600 | $1.9B | 0.68% | Call |
| 6 | IMC-Chicago, LLC | 14,900 | $1.2B | 0.43% | Put |
| 7 | Persistent Asset Partners Ltd | 285 | $432.0M | 0.19% | Call |
Similar Stocks by Institutional Ownership
As of Q4 2025, 7 institutional investors hold IONS (Ionis Pharmaceuticals, Inc.). The largest holder is SIMPLEX TRADING, LLC with $6.0B in shares. This quarter, 0 institutions opened new positions and 0 closed their positions.
Frequently Asked Questions
How many hedge funds own IONS?
As of Q4 2025, 7 institutional investors report holding IONS (Ionis Pharmaceuticals, Inc.) in their 13F filings.
Who is the largest institutional holder of IONS?
The largest institutional holder of IONS is SIMPLEX TRADING, LLC with $6.0B in shares.
Is institutional ownership of IONS increasing or decreasing?
This quarter, 0 institutions opened new positions in IONS and 0 closed their positions.