DOSSIER · 13F Holders · Q1 2026Technology · Telephone & Telegraph Apparatus
CIEN
CIENA CORP
1,199 institutions still hold CIENA CORP as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.
CUSIP 171779309·Telephone & Telegraph Apparatus·1,199 13F holders·last filed Mar 31, 2026
AI Holders Summary · Q1 2026
1,199 institutions reported CIEN in Q1 2026. FMR LLC leads at 21.3% of the visible book.
Top holders
Sorted by position value. Source: SEC EDGAR 13F-HR filings.
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