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CIEN · Ciena Corp · Holdings

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$449.77 +23.84 (+5.60%) At close · Oct 9
Market Cap
$63.55B
Shares
141.81M
Volume · Oct 9 3.78M Avg daily vol (3M) 2.43M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 1,231
Total Value: $68,026,725,043
Total Shares: 138,992,410
Showing 1–100 of 1,284 holdings by value · page 1 of 13

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 1,239 13F filers
Top Holder
13.8%
Sep 2023 → Jun 2026 · range 11.8% – 15.3%
of institutional value
Top 5
43.2%
Sep 2023 → Jun 2026 · range 36.0% – 48.3%
of institutional value
Top 10
56.4%
Sep 2023 → Jun 2026 · range 46.6% – 59.1%
of institutional value
HHI
480
Sep 2023 → Jun 2026 · range 394 – 580
Broadly held
Showing 100 of 1,284
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 936395 CUSIP 171779309 13F (30d) 45 filings 43 filers Visit website Investor relations