Ticker · CUSIP 171779309

CIEN

CIENA CORP
Technology·Communication Equipment
···Share
Holders (tracked)
21
Combined shares
10,304,449
Combined value
$2.41B
Last close
$507.43
Quarter
2025Q4
Price · 1Y$507.43+447.29 (+743.75%)H $507.43 · L $57.84 · Avg Vol 2.7M
Insider sellCongress buyCongress sell
$100.00$200.00$300.00$400.00$500.00VolJul 25Oct 25Jan 26Apr 26
Tracked holders · last 8 quarters
+6 vs previous quarter over the last 8.
2192024Q12025Q4
Price is +117.0% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

29 events
  1. DiPerna Dino · SVP Global R&D
    2026-04-15
    Sold $623.7K @ $471.79
    Insider sell
  2. DiPerna Dino · SVP Global R&D
    2026-04-15
    Sold $711.0K @ $471.79
    Insider sell
  3. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +161,400 shares · 2025Q4
    Position
  4. Ken Griffin (Citadel Advisors) trimmed2026-02-17
    −366,782 shares · 2025Q4
    Position
  5. D.E. Shaw & Co. trimmed2026-02-17
    −54,856 shares · 2025Q4
    Position
  6. AQR Capital Management trimmed2026-02-17
    −89,908 shares · 2025Q4
    Position
  7. Izzy Englander (Millennium Mgmt) trimmed2026-02-17
    −81,267 shares · 2025Q4
    Position
  8. Steve Cohen (Point72) trimmed2026-02-17
    −110,342 shares · 2025Q4
    Position
  9. Whale Rock Capital trimmed2026-02-17
    −444,317 shares · 2025Q4
    Position
  10. T. Rowe Price added2026-02-17
    +1,404,132 shares · 2025Q4
    Position
  11. Wellington Management opened position2026-02-17
    +107,488 shares · 2025Q4
    Position
  12. Stephen Mandel (Lone Pine Capital) exited2026-02-17
    −2,006,662 shares · 2025Q4
    Position
  13. Ray Dalio (Bridgewater Associates) added2026-02-13
    +50,936 shares · 2025Q4
    Position
  14. Renaissance Technologies opened position2026-02-12
    +32,600 shares · 2025Q4
    Position
  15. Norges Bank (Norway SWF) opened position2026-02-10
    +811,950 shares · 2025Q4
    Position
  16. First Eagle Investment Management trimmed2026-02-04
    −26,500 shares · 2025Q4
    Position
  17. Two Sigma Investments trimmed2025-11-14
    −99,703 shares · 2025Q3
    Position
  18. D.E. Shaw & Co. added2025-11-14
    +3,381 shares · 2025Q3
    Position
  19. AQR Capital Management added2025-11-14
    +281,541 shares · 2025Q3
    Position
  20. Izzy Englander (Millennium Mgmt) added2025-11-14
    +232,357 shares · 2025Q3
    Position
  21. Steve Cohen (Point72) trimmed2025-11-14
    −2,173,653 shares · 2025Q3
    Position
  22. Stephen Mandel (Lone Pine Capital) opened position2025-11-14
    +2,006,662 shares · 2025Q3
    Position
  23. Lee Ainslie (Maverick Capital) exited2025-11-14
    −10,546 shares · 2025Q3
    Position
  24. Whale Rock Capital added2025-11-14
    +501,952 shares · 2025Q3
    Position
  25. T. Rowe Price added2025-11-14
    +2,385,270 shares · 2025Q3
    Position
  26. Ray Dalio (Bridgewater Associates) added2025-11-13
    +113,751 shares · 2025Q3
    Position
  27. Norges Bank (Norway SWF) exited2025-11-13
    −78,190 shares · 2025Q3
    Position
  28. Norges Bank (Norway SWF) added2025-11-12
    +30,900 shares · 2024Q3
    Position
  29. First Eagle Investment Management trimmed2025-11-12
    −50,949 shares · 2025Q3
    Position

Insider activity

Last 30 days
Net (open-market)
−$1.33M
Buys
0 · $0
Sells
2 · $1.33M
Unique insiders
1
DateInsiderCodeSharesPriceValue
04-15DiPerna Dino
SVP Global R&D · Officer
S1,507$471.79$711.0K
04-15DiPerna Dino
SVP Global R&D · Officer
S1,322$471.79$623.7K
View full insider history for CIEN →
Follow-the-investor returns
If you'd copied each holder of CIEN…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
Renaissance Technologies2016Q1$53.01+857.2%$16.5M
Two Sigma Investments2016Q2$59.26+756.2%$10.7M
First Eagle Investment Management2022Q1$78.17+549.2%$20.8M
AQR Capital Management2016Q1$81.15+525.3%$716.8M
D.E. Shaw & Co.2016Q1$96.59+425.4%$7.0M
Whale Rock Capital2025Q2$105.47+381.1%$453.4M
Ray Dalio (Bridgewater Associates)2018Q2$150.51+237.1%$107.9M
T. Rowe Price2016Q1$171.56+195.8%$2.06B
Steve Cohen (Point72)2016Q1$188.52+169.2%$44.1M
Steve Cohen (Point72)2016Q1$188.52+169.2%$44.1M
Steve Cohen (Point72)2016Q1$188.52+169.2%$44.1M
Ken Griffin (Citadel Advisors)2016Q1$190.17+166.8%$138.4M
Ken Griffin (Citadel Advisors)2016Q1$190.17+166.8%$138.4M
Ken Griffin (Citadel Advisors)2016Q1$190.17+166.8%$138.4M
Wellington Management2016Q1$194.40+161.0%$54.5M
Paul Tudor Jones (Tudor Investment)2016Q2$195.15+160.0%$40.4M
Paul Tudor Jones (Tudor Investment)2016Q2$195.15+160.0%$40.4M
Izzy Englander (Millennium Mgmt)2016Q2$219.26+131.4%$36.3M
Izzy Englander (Millennium Mgmt)2016Q2$219.26+131.4%$36.3M
Izzy Englander (Millennium Mgmt)2016Q2$219.26+131.4%$36.3M
Norges Bank (Norway SWF)2016Q1$274.65+84.8%$412.0M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.
New positions4
Added to2
Trimmed7
Exited1

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
13
$86.40B
2022Q2
12
$67.43B
2022Q3
14
$824.7M
2022Q4
16
$1.10B
2023Q1
15
$1.08B
2023Q2
13
$896.6M
2023Q3
15
$969.7M
2023Q4
12
$897.8M
2024Q1
9
$928.9M
2024Q2
11
$914.5M
2024Q3
13
$333.4M
2024Q4
16
$646.5M
2025Q1
17
$419.2M
2025Q2
19
$538.8M
2025Q3
15
$1.55B
2025Q4
21
$2.41B
Congress members trading this stock
DateMemberTypeAmount rangeFiling
2025-10-31Lisa McClainSell$1K – $15KPDF ↗
2025-10-30Lisa McClainSell$1K – $15KPDF ↗
2025-10-30Lisa McClainBuy$1K – $15KPDF ↗
2025-10-15Lisa McClainSell$1K – $15KPDF ↗
2025-06-17Lisa McClainBuy$1K – $15KPDF ↗

Who owns CIEN

21 super-investors · 2025Q4
Tracked stake
10.30M
shares
Combined value
$2.41B
% of shares outstanding
—
shares-out unknown
Quarter action mix
New5Added2Trim13Held1
#ManagerSharesValue
1T. Rowe Price4.05M$948M
2AQR Capital Management1.41M$330M
3Whale Rock Capital893.5K$209M
4Norges Bank
Norway SWF
812.0K$190M
5Ken Griffin
Citadel Advisors
719.7K$168M
6Steve Cohen
Point72
470.7K$110M
7Izzy Englander
Millennium Mgmt
422.6K$99M
8Ken Griffin
Citadel Advisors
313.6K$73M
9Ken Griffin
Citadel Advisors
272.8K$64M
10Ray Dalio
Bridgewater Associates
212.6K$50M
11Steve Cohen
Point72
127.4K$30M
12Wellington Management107.5K$25M
13Steve Cohen
Point72
87.0K$20M
14Paul Tudor Jones
Tudor Investment
81.7K$19M
15Paul Tudor Jones
Tudor Investment
79.7K$19M
16Izzy Englander
Millennium Mgmt
71.5K$17M
17Izzy Englander
Millennium Mgmt
59.5K$14M
18First Eagle Investment Management40.9K$10M
19Renaissance Technologies32.6K$8M
20Two Sigma Investments21.1K$5M
21D.E. Shaw & Co.13.9K$3M

Recent moves

20 transactions
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