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 $357.34M based on SEC Form 13F filings for the quarter ended March 31, 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.