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Jeremy Grantham's Ciena Corporation (CIEN) position

Not anymore: Jeremy Grantham fully exited CIEN in Q2 2025. The position peaked at $46M in Q4 2024.
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Value at exit
$15M
Shares at exit
253K
Est. average buy price (i)
$49.22
Quarter-end price
$60.43

Estimated trade prices

Average price in quarters with purchases
$49.54
Average prices in quarters with sales
  • Q1 2025: $79.05 (291K shares sold)
  • Q4 2024: $71.76 (114K shares sold)
  • Q4 2023: $44.09 (16K shares sold)
  • Q4 2022: $45.21 (59K shares sold)

CIEN price vs Grantham's position

1Y 3Y 5Y MAX
Dates
$40$500$1,00020222023202420252026New position of 13K shares · Q3 2021. Average closing price $55.54 · Price range $50.84–$58.5113KsharespurchasedAdded 20K shares (155.4%) · Q4 2021. Average closing price $61.70 · Price range $51.73–$77.6020KsharespurchasedNew position of 16K shares · Q2 2022. Average closing price $51.84 · Price range $42.04–$61.7416KsharespurchasedAdded 158K shares (968.3%) · Q3 2022. Average closing price $48.05 · Price range $39.71–$56.37158KsharespurchasedSold 59K shares (33.8%) · Q4 2022. Average closing price $45.21 · Price range $39.16–$51.8759KsharessoldAdded 109K shares (94.7%) · Q1 2023. Average closing price $49.92 · Price range $46.18–$52.52109KsharespurchasedAdded 170K shares (75.7%) · Q3 2023. Average closing price $44.08 · Price range $40.43–$49.98170KsharespurchasedSold 16K shares (4.0%) · Q4 2023. Average closing price $44.09 · Price range $40.60–$47.1616KsharessoldAdded 200K shares (52.8%) · Q1 2024. Average closing price $52.75 · Price range $44.58–$62.48200KsharespurchasedAdded 25K shares (4.3%) · Q2 2024. Average closing price $47.46 · Price range $43.56–$49.5625KsharespurchasedAdded 55K shares (9.1%) · Q3 2024. Average closing price $52.69 · Price range $45.77–$62.4655KsharespurchasedSold 114K shares (17.4%) · Q4 2024. Average closing price $71.76 · Price range $61.45–$91.14114KsharessoldSold 291K shares (53.5%) · Q1 2025. Average closing price $79.05 · Price range $60.43–$98.18291Ksharessold
Average closing price · filing quarter
$79.05
Price range · filing quarter
$60.43 – $98.18
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q2 2025 Exited −253K −$18M −100.0% 0 Aug 13, 2025
Q1 2025 Reduced −291K −$23M −53.5% 253K May 14, 2025
Q4 2024 Reduced −114K −$8.2M −17.4% 544K Feb 13, 2025
Q3 2024 Added +55K +$2.9M +9.1% 658K Nov 13, 2024
Q2 2024 Added +25K +$1.2M +4.3% 603K Aug 13, 2024
Q1 2024 Added +200K +$11M +52.8% 578K May 14, 2024
Q4 2023 Reduced −16K −$703K −4.0% 378K Feb 13, 2024
Q3 2023 Added +170K +$7.5M +75.7% 394K Nov 13, 2023
Q2 2023 Unchanged – – – 224K Aug 14, 2023
Q1 2023 Added +109K +$5.4M +94.7% 224K May 12, 2023
Q4 2022 Reduced −59K −$2.7M −33.8% 115K Feb 13, 2023
Q3 2022 Added +158K +$7.6M +968.3% 174K Nov 10, 2022
Q2 2022 New +16K +$845K – 16K Aug 12, 2022
Q4 2021 Added +20K +$1.2M +155.4% 33K Feb 11, 2022
Q3 2021 New +13K +$711K – 13K Nov 12, 2021
Data through Q2 2025 · filed Aug 13, 2025
15 grouped rows from 15 quarters

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Common questions

Does Jeremy Grantham own CIEN?

Not currently. Jeremy Grantham fully exited CIEN in Q2 2025, and the complete history is above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Jeremy Grantham buy CIEN?

Jeremy Grantham first disclosed a CIEN position in Q3 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 Jeremy Grantham sell CIEN?

Yes. Jeremy Grantham reduced and then fully exited CIEN by Q2 2025; the reductions are in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of CIEN does Jeremy Grantham own?

None as of the latest filing: Jeremy Grantham has exited CIEN. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Jeremy Grantham pay for CIEN?

Jeremy Grantham's estimated average buy price for CIEN is $49.22, 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.