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Ken Griffin's Ciena Corporation (CIEN) position

Yes: as of Q1 2026, Ken Griffin holds 140K shares of CIEN worth $52M (0.0% of the disclosed portfolio). Last quarter the position was reduced by 80.5%. First disclosed Q2 2021.
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Current value
$52M
Shares held
140K
% of portfolio
0.0%
Est. average buy price (i)
$101.40
Quarter-end price
$367.84

Estimated trade prices

Average price in quarters with purchases
$63.31
Average prices in quarters with sales
  • Q1 2026: $304.86 (579K shares sold)
  • Q4 2025: $194.00 (367K shares sold)
  • Q2 2025: $71.73 (382K shares sold)
  • Q1 2025: $79.05 (53K shares sold)
  • Q4 2024: $71.76 (148K shares sold)
  • Q2 2024: $47.46 (6K shares sold)
  • Q4 2023: $44.09 (1.1M shares sold)
  • Q1 2023: $49.92 (493K shares sold)
  • Q3 2022: $48.05 (272K shares sold)
  • Q1 2022: $65.45 (687K shares sold)
  • Q3 2021: $55.54 (83K shares sold)

CIEN price vs Griffin's position

1Y 3Y 5Y MAX
Dates
$20$500$1,00020192020202120222023202420252026New position of 451K shares · Q2 2021. Average closing price $55.12 · Price range $49.52–$60.77451KsharespurchasedSold 83K shares (18.3%) · Q3 2021. Average closing price $55.54 · Price range $50.84–$58.5183KsharessoldAdded 447K shares (121.4%) · Q4 2021. Average closing price $61.70 · Price range $51.73–$77.60447KsharespurchasedSold 687K shares (84.3%) · Q1 2022. Average closing price $65.45 · Price range $53.70–$77.38687KsharessoldAdded 205K shares (160.2%) · Q2 2022. Average closing price $51.84 · Price range $42.04–$61.74205KsharespurchasedSold 272K shares (81.6%) · Q3 2022. Average closing price $48.05 · Price range $39.71–$56.37272KsharessoldAdded 618K shares (over 1,000%) · Q4 2022. Average closing price $45.21 · Price range $39.16–$51.87618KsharespurchasedSold 493K shares (72.6%) · Q1 2023. Average closing price $49.92 · Price range $46.18–$52.52493KsharessoldAdded 624K shares (335.5%) · Q2 2023. Average closing price $45.54 · Price range $41.02–$52.27624KsharespurchasedAdded 346K shares (42.8%) · Q3 2023. Average closing price $44.08 · Price range $40.43–$49.98346KsharespurchasedSold 1.1M shares (95.3%) · Q4 2023. Average closing price $44.09 · Price range $40.60–$47.161.1MsharessoldAdded 23K shares (42.1%) · Q1 2024. Average closing price $52.75 · Price range $44.58–$62.4823KsharespurchasedSold 6K shares (8.3%) · Q2 2024. Average closing price $47.46 · Price range $43.56–$49.566KsharessoldAdded 522K shares (743.7%) · Q3 2024. Average closing price $52.69 · Price range $45.77–$62.46522KsharespurchasedSold 148K shares (24.9%) · Q4 2024. Average closing price $71.76 · Price range $61.45–$91.14148KsharessoldSold 53K shares (11.9%) · Q1 2025. Average closing price $79.05 · Price range $60.43–$98.1853KsharessoldSold 382K shares (97.6%) · Q2 2025. Average closing price $71.73 · Price range $53.50–$83.89382KsharessoldAdded 1.1M shares (over 1,000%) · Q3 2025. Average closing price $101.84 · Price range $77.75–$145.671.1MsharespurchasedSold 367K shares (33.8%) · Q4 2025. Average closing price $194.00 · Price range $151.45–$242.25367KsharessoldSold 579K shares (80.5%) · Q1 2026. Average closing price $304.86 · Price range $225.21–$437.70579Ksharessold
Average closing price · filing quarter
$304.86
Price range · filing quarter
$225.21 – $437.70
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Reduced −579K −$177M −80.5% 140K May 15, 2026
Q4 2025 Reduced −367K −$71M −33.8% 720K Feb 17, 2026
Q3 2025 Added +1.1M +$110M +11,260.6% 1.1M Nov 14, 2025
Q2 2025 Reduced −382K −$27M −97.6% 10K Aug 14, 2025
Q1 2025 Reduced −53K −$4.2M −11.9% 392K May 15, 2025
Q4 2024 Reduced −148K −$11M −24.9% 445K Feb 14, 2025
Q3 2024 Added +522K +$28M +743.7% 592K Nov 14, 2024
Q2 2024 Reduced −6K −$301K −8.3% 70K Aug 14, 2024
Q1 2024 Added +23K +$1.2M +42.1% 77K May 15, 2024
Q4 2023 Reduced −1.1M −$49M −95.3% 54K Feb 14, 2024
Q3 2023 Added +346K +$15M +42.8% 1.2M Nov 14, 2023
Q2 2023 Added +624K +$28M +335.5% 810K Aug 14, 2023
Q1 2023 Reduced −493K −$25M −72.6% 186K May 15, 2023
Q4 2022 Added +618K +$28M +1,011.4% 679K Feb 14, 2023
Q3 2022 Reduced −272K −$13M −81.6% 61K Nov 14, 2022
Q2 2022 Added +205K +$11M +160.2% 333K Aug 15, 2022
Q1 2022 Reduced −687K −$45M −84.3% 128K May 16, 2022
Q4 2021 Added +447K +$28M +121.4% 815K Feb 14, 2022
Q3 2021 Reduced −83K −$4.6M −18.3% 368K Nov 15, 2021
Q2 2021 New +451K +$25M – 451K Aug 16, 2021
Data through Q1 2026 · filed May 15, 2026
20 grouped rows from 20 quarters

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Common questions

Does Ken Griffin own CIEN?

Yes. As of Q1 2026, Ken Griffin disclosed 140K shares of CIEN, worth $52M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy CIEN?

Ken Griffin first disclosed a CIEN position in Q2 2021; every quarterly buy and sell since is in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Ken Griffin sell CIEN?

The quarter-by-quarter table above shows each sale and reduction Ken Griffin disclosed in CIEN. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of CIEN does Ken Griffin own?

Ken Griffin disclosed 140K shares of CIEN as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Ken Griffin pay for CIEN?

Ken Griffin's estimated average buy price for CIEN is $101.40, from quarter-average prices weighted by the shares added each quarter. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How are the estimated trade prices calculated?

13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.