Stock Ownership/CIEN

CIENA CORP (CIEN): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in CIEN · Information Technology. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
38
13F filers
Aggregate Value
$3.0B
Across holders
Last Price
$371.95
2026-08-24
Sector
Information Technology
GICS
Quarterly fund activity28 increased10 reduced7 exited
Full exits: LONE PINE CAPITAL LLC, TUDOR INVESTMENT CORP ET AL, Select Equity Group, L.P., Holocene Advisors, LP, STEADFAST CAPITAL MANAGEMENT LP, Whale Rock Capital Management LLC, Parallax Volatility Advisers, L.P.
Institutional Holders of CIEN
↗
38 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
Hedge Fund1.68M$822.7M27.1%0.4%Added+$141.6MQ2 2026
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
Hedge Fund1.05M$507.2M16.7%0.2%Added+$505.8MQ2 2026
BALYASNY ASSET MANAGEMENT LLC
CIK 0001218710
Hedge Fund372K$182.7M6.0%0.2%Added+$24.1MQ2 2026
Man Group plc
CIK 0001637460
Hedge Fund335K$164.2M5.4%0.3%Added+$141.6MQ2 2026
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
Institutional Manager308K$151.1M5.0%0.1%Reduced$-63.8MQ2 2026
Qube Research & Technologies Ltd
CIK 0001729829
Hedge Fund283K$138.8M4.6%0.1%Added—Q2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund214K$105.0M3.5%0.0%Added+$57.8MQ2 2026
Point72 Asset Management, L.P.
CIK 0001603466
Hedge Fund211K$103.3M3.4%0.1%Reduced+$49.8MQ2 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
Hedge Fund185K$90.6M3.0%0.1%Added+$42.7MQ2 2026
Squarepoint Ops LLC
CIK 0001642575
Hedge Fund167K$82.1M2.7%0.1%Added+$71.8MQ2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPAdded
Hedge Fund
$822.7M· 27.1% of total· 0.4% port· 1.68M sh· +$141.6M QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$507.2M· 16.7% of total· 0.2% port· 1.05M sh· +$505.8M QoQ· Q2 2026
BALYASNY ASSET MANAGEMENT LLCAdded
Hedge Fund
$182.7M· 6.0% of total· 0.2% port· 372K sh· +$24.1M QoQ· Q2 2026
Man Group plcAdded
Hedge Fund
$164.2M· 5.4% of total· 0.3% port· 335K sh· +$141.6M QoQ· Q2 2026
PRIMECAP MANAGEMENT CO/CA/Reduced
Institutional Manager
$151.1M· 5.0% of total· 0.1% port· 308K sh· $-63.8M QoQ· Q2 2026
Qube Research & Technologies LtdAdded
Hedge Fund
$138.8M· 4.6% of total· 0.1% port· 283K sh· — QoQ· Q2 2026
CITADEL ADVISORS LLCAdded
Hedge Fund
$105.0M· 3.5% of total· 0.0% port· 214K sh· +$57.8M QoQ· Q2 2026
Point72 Asset Management, L.P.Reduced
Hedge Fund
$103.3M· 3.4% of total· 0.1% port· 211K sh· +$49.8M QoQ· Q2 2026
RENAISSANCE TECHNOLOGIES LLCAdded
Hedge Fund
$90.6M· 3.0% of total· 0.1% port· 185K sh· +$42.7M QoQ· Q2 2026
Squarepoint Ops LLCAdded
Hedge Fund
$82.1M· 2.7% of total· 0.1% port· 167K sh· +$71.8M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCAdded
Hedge Fund
$81.6M· 2.7% of total· 0.0% port· 166K sh· +$54.5M QoQ· Q2 2026
JUPITER ASSET MANAGEMENT LTDAdded
Hedge Fund
$69.6M· 2.3% of total· 0.3% port· 142K sh· +$53.3M QoQ· Q2 2026
SHAW D E & CO INCAdded
Hedge Fund
$65.3M· 2.2% of total· 0.0% port· 133K sh· +$47.5M QoQ· Q2 2026
Senvest Management, LLCReduced
Hedge Fund
$64.0M· 2.1% of total· 1.9% port· 130K sh· $-20.8M QoQ· Q2 2026
Rokos Capital Management LLPAdded
Hedge Fund
$62.3M· 2.1% of total· 0.2% port· 127K sh· +$29.7M QoQ· Q2 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.Added
Hedge Fund
$61.8M· 2.0% of total· 0.1% port· 126K sh· +$4.8M QoQ· Q2 2026
CAXTON ASSOCIATES LLPAdded
Hedge Fund
$57.8M· 1.9% of total· 1.1% port· 118K sh· — QoQ· Q2 2026
Gotham Asset Management, LLCReduced
Hedge Fund
$55.4M· 1.8% of total· 0.1% port· 113K sh· $-4.1M QoQ· Q2 2026
Bridgewater Associates, LPReduced
Hedge Fund
$49.6M· 1.6% of total· 0.2% port· 101K sh· $-21.0M QoQ· Q2 2026
Walleye Capital LLCAdded
Hedge Fund
$43.8M· 1.4% of total· 0.2% port· 89K sh· +$36.8M QoQ· Q2 2026
MARSHALL WACE, LLPReduced
Hedge Fund
$22.1M· 0.7% of total· 0.0% port· 45K sh· +$8.6M QoQ· Q2 2026
Woodline Partners LPAdded
Hedge Fund
$15.1M· 0.5% of total· 0.0% port· 31K sh· +$1.6M QoQ· Q2 2026
VOLORIDGE INVESTMENT MANAGEMENT, LLCAdded
Hedge Fund
$11.9M· 0.4% of total· 0.1% port· 24K sh· — QoQ· Q2 2026
Brevan Howard Capital Management LPAdded
Hedge Fund
$7.4M· 0.2% of total· 0.1% port· 15K sh· +$6.2M QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPAdded
Hedge Fund
$4.7M· 0.2% of total· 0.0% port· 10K sh· +$4.2M QoQ· Q2 2026
Schonfeld Strategic Advisors LLCAdded
Hedge Fund
$4.1M· 0.1% of total· 0.0% port· 8K sh· — QoQ· Q2 2026
Rockefeller Capital Management L.P.Added
Hedge Fund
$3.0M· 0.1% of total· 0.0% port· 6K sh· $-5.3M QoQ· Q2 2026
TCW GROUP INCAdded
Hedge Fund
$1.2M· 0.0% of total· 0.0% port· 2K sh· +$21K QoQ· Q2 2026
Fulcrum Asset Management LLPAdded
Hedge Fund
$1.2M· 0.0% of total· 0.1% port· 2K sh· — QoQ· Q2 2026
First Eagle Investment Management, LLCReduced
Institutional Manager
$981K· 0.0% of total· 0.0% port· 2K sh· $-294K QoQ· Q2 2026
Hudson Bay Capital Management LPAdded
Hedge Fund
$451K· 0.0% of total· 0.0% port· 920 sh· — QoQ· Q2 2026
Alphadyne Asset Management LPAdded
Hedge Fund
$419K· 0.0% of total· 0.0% port· 855 sh· $-13.3M QoQ· Q2 2026
Magnetar Financial LLCAdded
Hedge Fund
$377K· 0.0% of total· 0.0% port· 769 sh· — QoQ· Q2 2026
Fisher Asset Management, LLCAdded
Institutional Manager
$333K· 0.0% of total· 0.0% port· 679 sh· +$34K QoQ· Q2 2026
Bridgewater Advisors Inc.Reduced
Hedge Fund
$279K· 0.0% of total· 0.0% port· 723 sh· $-385 QoQ· Q2 2026
Lighthouse Investment Partners, LLCAdded
Hedge Fund
$267K· 0.0% of total· 0.0% port· 544 sh· — QoQ· Q2 2026
Verition Fund Management LLCReduced
Hedge Fund
$219K· 0.0% of total· 0.0% port· 446 sh· $-20.4M QoQ· Q2 2026
Ancora Advisors, LLCReduced
Hedge Fund
$9K· 0.0% of total· 0.0% port· 18 sh· $-3K QoQ· Q2 2026
1–10 of 38
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