ANNEXON INC (ANNX) Institutional Ownership and Insiders Activity

ANNEXON INC (ANNX) is widely held by institutional investors, with 1 tracked firm reporting positions valued at approximately $3.02M based on SEC Form 13F filings for the quarter ended March 31, 2026.

Renaissance Technologies LLC is the largest disclosed holder, reporting approximately $3.02M in ANNX holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Renaissance Technologies LLC representing the majority of disclosed value.

Recent insider activity includes 2 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.