Skip to main content
CIEN logo

CIEN · Ciena Corp

Track CIEN — free
$387.66 +15.71 (+4.22%) At close · Aug 25
Market Cap
$54.87B
Shares
141.55M

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.

Holders: 1,231
Total Value: $67,894,102,811
Total Shares: 138,650,695

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 1,231 13F filers · Δ vs Mar 31, 2026
Top Holder
13.8%
Sep 2023 → Jun 2026 · range 11.8% – 15.3%
−1.5 pts
Top 5
43.3%
Sep 2023 → Jun 2026 · range 36.0% – 48.3%
−1.0 pts
Top 10
56.5%
Sep 2023 → Jun 2026 · range 46.6% – 59.1%
−2.6 pts
HHI
482
Sep 2023 → Jun 2026 · range 394 – 580
Broadly held−43

Quarterly Activity

vs Mar 31, 2026
New
263
Increased
468
Decreased
391
Sold Out
121
Unchanged
109
Holder count: +142
Institutional value: +26.5%
Shares held: +0.3%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,284
Export CSV
Holder Value (USD) % of 13F Shares Open
Key facts CIK 936395 CUSIP 171779309 13F (30d) 946 filings 939 filers Visit website Investor relations