Ticker · CUSIP 171779309

CIEN

CIENA CORP
Technology·Communication Equipment
···Share
Holders (tracked)
21
Combined shares
10,304,449
Combined value
$1.46B
Last close
$495.17
Quarter
2025Q4
Tracked holders · last 8 quarters
+6 vs previous quarter over the last 8.
2192024Q12025Q4
Price is +248.7% 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
    13F
  4. Ken Griffin (Citadel Advisors) trimmed2026-02-17
    −366,782 shares · 2025Q4
    13F
  5. D.E. Shaw & Co. trimmed2026-02-17
    −54,856 shares · 2025Q4
    13F
  6. AQR Capital Management trimmed2026-02-17
    −89,908 shares · 2025Q4
    13F
  7. Izzy Englander (Millennium Mgmt) trimmed2026-02-17
    −81,267 shares · 2025Q4
    13F
  8. Steve Cohen (Point72) trimmed2026-02-17
    −110,342 shares · 2025Q4
    13F
  9. Whale Rock Capital trimmed2026-02-17
    −444,317 shares · 2025Q4
    13F
  10. T. Rowe Price added2026-02-17
    +1,404,132 shares · 2025Q4
    13F
  11. Wellington Management opened position2026-02-17
    +107,488 shares · 2025Q4
    13F
  12. Stephen Mandel (Lone Pine Capital) exited2026-02-17
    −2,006,662 shares · 2025Q4
    13F
  13. Ray Dalio (Bridgewater Associates) added2026-02-13
    +50,936 shares · 2025Q4
    13F
  14. Renaissance Technologies opened position2026-02-12
    +32,600 shares · 2025Q4
    13F
  15. Norges Bank (Norway SWF) opened position2026-02-10
    +811,950 shares · 2025Q4
    13F
  16. First Eagle Investment Management trimmed2026-02-04
    −26,500 shares · 2025Q4
    13F
  17. Two Sigma Investments trimmed2025-11-14
    −99,703 shares · 2025Q3
    13F
  18. D.E. Shaw & Co. added2025-11-14
    +3,381 shares · 2025Q3
    13F
  19. AQR Capital Management added2025-11-14
    +281,541 shares · 2025Q3
    13F
  20. Izzy Englander (Millennium Mgmt) added2025-11-14
    +232,357 shares · 2025Q3
    13F
  21. Steve Cohen (Point72) trimmed2025-11-14
    −2,173,653 shares · 2025Q3
    13F
  22. Stephen Mandel (Lone Pine Capital) opened position2025-11-14
    +2,006,662 shares · 2025Q3
    13F
  23. Lee Ainslie (Maverick Capital) exited2025-11-14
    −10,546 shares · 2025Q3
    13F
  24. Whale Rock Capital added2025-11-14
    +501,952 shares · 2025Q3
    13F
  25. T. Rowe Price added2025-11-14
    +2,385,270 shares · 2025Q3
    13F
  26. Ray Dalio (Bridgewater Associates) added2025-11-13
    +113,751 shares · 2025Q3
    13F
  27. Norges Bank (Norway SWF) exited2025-11-13
    −78,190 shares · 2025Q3
    13F
  28. Norges Bank (Norway SWF) added2025-11-12
    +30,900 shares · 2024Q3
    13F
  29. First Eagle Investment Management trimmed2025-11-12
    −50,949 shares · 2025Q3
    13F

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 13F share-delta history. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
T. Rowe Price2016Q1$0.20+243731.9%$2.01B
Renaissance Technologies2016Q1$38.95+1171.4%$16.1M
Two Sigma Investments2016Q2$59.26+735.6%$10.4M
First Eagle Investment Management2022Q1$78.02+534.6%$20.3M
AQR Capital Management2016Q1$81.15+510.2%$699.5M
D.E. Shaw & Co.2016Q1$96.58+412.7%$6.9M
Whale Rock Capital2025Q2$105.47+369.5%$442.4M
Ray Dalio (Bridgewater Associates)2018Q2$150.51+229.0%$105.3M
Steve Cohen (Point72)2016Q1$188.52+162.7%$43.1M
Steve Cohen (Point72)2016Q1$188.52+162.7%$43.1M
Steve Cohen (Point72)2016Q1$188.52+162.7%$43.1M
Ken Griffin (Citadel Advisors)2016Q1$190.17+160.4%$135.1M
Ken Griffin (Citadel Advisors)2016Q1$190.17+160.4%$135.1M
Ken Griffin (Citadel Advisors)2016Q1$190.17+160.4%$135.1M
Wellington Management2016Q1$194.40+154.7%$53.2M
Paul Tudor Jones (Tudor Investment)2016Q2$195.14+153.7%$39.5M
Paul Tudor Jones (Tudor Investment)2016Q2$195.14+153.7%$39.5M
Izzy Englander (Millennium Mgmt)2016Q2$219.26+125.8%$35.4M
Izzy Englander (Millennium Mgmt)2016Q2$219.26+125.8%$35.4M
Izzy Englander (Millennium Mgmt)2016Q2$219.26+125.8%$35.4M
Norges Bank (Norway SWF)2016Q1$274.65+80.3%$402.1M

Who moved on this name in 2025Q4

13F transactions 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
$54.6M
2022Q4
16
$1.03B
2023Q1
15
$1.03B
2023Q2
13
$892.7M
2023Q3
15
$965.2M
2023Q4
12
$887.3M
2024Q1
9
$827.0M
2024Q2
11
$851.5M
2024Q3
13
$237.3M
2024Q4
16
$254.6M
2025Q1
17
$348.6M
2025Q2
19
$517.5M
2025Q3
15
$1.17B
2025Q4
21
$1.46B
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
$1.46B
% of shares outstanding
—
shares-out unknown
Quarter action mix
New5Added2Trim13Held1
#ManagerSharesValue
1AQR Capital Management1.41M$330M
2Whale Rock Capital893.5K$209M
3Norges Bank
Norway SWF
812.0K$190M
4Ken Griffin
Citadel Advisors
719.7K$168M
5Steve Cohen
Point72
470.7K$110M
6Izzy Englander
Millennium Mgmt
422.6K$99M
7Ken Griffin
Citadel Advisors
313.6K$73M
8Ken Griffin
Citadel Advisors
272.8K$64M
9Ray Dalio
Bridgewater Associates
212.6K$50M
10Steve Cohen
Point72
127.4K$30M
11Wellington Management107.5K$25M
12Steve Cohen
Point72
87.0K$20M
13Paul Tudor Jones
Tudor Investment
81.7K$19M
14Paul Tudor Jones
Tudor Investment
79.7K$19M
15Izzy Englander
Millennium Mgmt
71.5K$17M
16Izzy Englander
Millennium Mgmt
59.5K$14M
17First Eagle Investment Management40.9K$10M
18Renaissance Technologies32.6K$8M
19Two Sigma Investments21.1K$5M
20D.E. Shaw & Co.13.9K$3M
21T. Rowe Price4.05M$948K

Recent moves

20 transactions
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