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ROCKWOOD RESEARCH · A CORPORATE FILINGS WEBSITE|STRAIGHT FROM THE SOURCE · SEC EDGAR|SPONSOREDYour message on this tape — bid on the Rockwood Ad Exchange · Rockwood Ad Exchange|
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CIEN

CIENA CORP

Telephone & Telegraph Apparatus · SIC 3661CIK 936395Held by 12 tracked managersEDGAR filings ↗10-K/10-Q ↗

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12 managers · Q2 2026 13F
ThornTree Capital Partners
ThornTree Capital PartnersPosition history →
8.7%
—
Atreides Management
Atreides ManagementPosition history →
3.0%
+1.7%
Jericho Capital Asset Management
Jericho Capital Asset ManagementPosition history →
2.3%
(66.1%)
SCGE Management
SCGE ManagementPosition history →
0.74%
NEW
Tortoise Capital Advisors
Tortoise Capital AdvisorsPosition history →
0.23%
+84.3%
Bridgewater Associates
Bridgewater AssociatesPosition history →
0.20%
(29.8%)
Renaissance Technologies
Renaissance TechnologiesPosition history →
0.12%
+88.9%
Capital World Investors
Capital World InvestorsPosition history →
0.10%
+1.8%
Adage Capital Management
Adage Capital ManagementPosition history →
0.09%
+8.4%
Capital Research Global Investors
Capital Research Global InvestorsPosition history →
0.04%
(76.1%)
Mairs & Power
Mairs & PowerPosition history →
0.01%
—
First Eagle Investment Management
First EaglePosition history →
<0.01%
(23.1%)

Weight = position value ÷ the manager's total 13F long-equity value in the same filing — one definition for every row. “1st obs.” marks a position with no earlier stored 13F to compare against — it is not shown as a purchase.