Ciena Corporation (CIEN)

Highly Crowded

Held by 1,034 of 5,944 reporting institutions (99th percentile) — extremely crowded.

Data as of Q1 2026

Institutional Ownership

93.76%

QoQ Change

-8.70%

Total Value

$48.5T

Shares Outstanding

141.4M

Crowding AnalysisHighly Crowded

Holders1,034of 5,944

Avg: 68

Uncrowded99th percentileCrowded

Institutional Activity

Buy/Sell Ratio1.37x

98th percentile

634 buying463 selling

+317

New

-96

Closed

-13,656,664

Net shares

Holding Period Distribution

estimate

Median: 2 QAvg: 2.6 QHolders: 1,034

Ownership Concentration

Top 5: 46.3%Top 10: 61.6%

FMR16.0%

BlackRock,10.1%

JPMORGAN CHASE &7.7%

VANGUARD CAPITAL MANAGEMENT6.9%

VANGUARD PORTFOLIO MANAGEMENT5.6%

Others (1029)53.7%

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Conviction-Weighted Ownership

Median weight: 0.12%Avg weight: 0.16%Max: 0.43%High conviction (>1%): 0

FMR

BlackRock,

JPMORGAN CHASE &

VANGUARD CAPITAL MANAGEMENT

VANGUARD PORTFOLIO MANAGEMENT

STATE STREET

PRICE T ROWE ASSOCIATES

GEODE CAPITAL MANAGEMENT,

Capital Research Global Investors

BANK OF AMERICA

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Whale Moves Timeline (8 Quarters)

Biggest dollar-value position changes among top 10 holders

NEWVANGUARD CAPITAL MANAGEMENT$3.6B9.2M shr

NEWVANGUARD PORTFOLIO MANAGEMENT$2.9B7.4M shr

SOLDBlackRock$1.3B3.3M shr

NEWCapital Research Global Investors$1.1B2.8M shr

BOUGHTGEODE CAPITAL MANAGEMENT$534M1.4M shr

BOUGHTJPMORGAN CHASE$1.0B4.4M shr

NEWARROWSTREET CAPITAL, LIMITED PARTNERSHIP$523M2.2M shr

BOUGHTBlackRock$251M1.1M shr

SOLDBANK OF AMERICA CORP /DE$245M1.0M shr

BOUGHTSTATE STREET$175M750K shr

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Institutional Trends (8 Quarters)

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Institutional Holders

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