CIENA CORP (CIEN) Institutional Ownership and Insiders Activity

CIENA CORP (CIEN) is widely held by institutional investors, with 5 tracked firms reporting positions valued at approximately $358.01M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Lone Pine Capital is the largest disclosed holder, reporting approximately $314.28M in CIEN holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Lone Pine Capital representing the majority of disclosed value.

Recent insider activity includes 50 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.