IONIS PHARMACEUTICALS INC (IONS) Institutional Ownership and Insiders Activity

IONIS PHARMACEUTICALS INC (IONS) is widely held by institutional investors, with 4 tracked firms reporting positions valued at approximately $249.29M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Tweedy, Browne Co All Funds (US) is the largest disclosed holder, reporting approximately $180.81M in IONS holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Tweedy, Browne Co All Funds (US) representing the majority of disclosed value.

Recent insider activity includes 28 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.