IONIS PHARMACEUTICALS INC (IONS) Institutional Ownership and Insiders Activity

IONIS PHARMACEUTICALS INC (IONS) is widely held by institutional investors, with 3 tracked firms reporting positions valued at approximately $215.50M based on SEC Form 13F filings for the quarter ended March 31, 2026.

Tweedy, Browne Co All Funds (US) is the largest disclosed holder, reporting approximately $170.88M 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.