ADTRAN HOLDINGS INC (ADTN) Institutional Ownership and Insiders Activity

ADTRAN HOLDINGS INC (ADTN) is widely held by institutional investors, with 3 tracked firms reporting positions valued at approximately $42.99M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Renaissance Technologies LLC is the largest disclosed holder, reporting approximately $24.65M in ADTN 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 6 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.