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Arphra AIPlain-English read on Ciena Corporation’s valuationSplits to date
2
last · 1:7 Sep 2006
Cumulative split
1:4
across recorded splits
Dividend events
0
none on file
Corporate actions
· stock_splits · dividendsmost recent first
- Sep 2006Stock splitsplit
1-for-7 reverse split
- Sep 2000Stock splitsplit
2-for-1 forward split
Stock splits
DB · stock_splits2| Date | Ratio | Type | Multiplier |
|---|---|---|---|
| Sep 25, 2006 | 1-for-7 | Reverse | 0.14× |
| Sep 19, 2000 | 2-for-1 | Forward | 2.00× |
M&A activity
7DBWhole-company transactions where CIEN is acquirer or target.
Beneficial-ownership filings
DB · 13D/G50| Filed | Form | Reporter | % owned | Shares | |
|---|---|---|---|---|---|
| Apr 29, 2026 | — | Vanguard Portfolio Management | 5.22% | — | SEC → |
| Apr 29, 2026 | — | Vanguard Capital Management | 7.47% | — | SEC → |
| Apr 24, 2026 | — | BlackRock, Inc. | 8.00% | — | SEC → |
| Mar 26, 2026 | — | The Vanguard Group | 0.00% | — | SEC → |
| Jan 21, 2026 | — | JPMORGAN CHASE & CO. | 7.70% | — | SEC → |
| Dec 04, 2025 | — | BlackRock, Inc. | 10.30% | — | SEC → |
| Apr 17, 2025 | — | BlackRock, Inc. | 9.40% | — | SEC → |
| Jan 20, 2023 | — | (1) BlackRock, Inc. | 11.50% | — | SEC → |
| Feb 09, 2022 | — | The Vanguard Group - 23-1945930 | 9.39% | — | SEC → |
| Jan 27, 2022 | — | (1) BlackRock, Inc. | 10.00% | — | SEC → |
| Jan 26, 2022 | — | (1) BlackRock, Inc. | 10.00% | — | SEC → |
| Apr 12, 2021 | — | (1) BlackRock, Inc. | 10.20% | — | SEC → |
| Feb 10, 2021 | — | The Vanguard Group - 23-1945930 | 9.26% | — | SEC → |
| Jan 29, 2021 | — | (1) BlackRock, Inc. | 9.60% | — | SEC → |
| Feb 12, 2020 | — | The Vanguard Group - 23-1945930 | 9.45% | — | SEC → |
| Feb 04, 2020 | — | (1) BlackRock, Inc. | 10.20% | — | SEC → |
| Jan 30, 2019 | — | (1) BlackRock, Inc. | 11.40% | — | SEC → |
| Jan 24, 2019 | — | (1) BlackRock, Inc. | 11.40% | — | SEC → |
| Feb 14, 2018 | — | TIAA-CREF Investment Management, LLC | 1.79% | — | SEC → |
| Feb 14, 2018 | — | Teachers Advisors, LLC | 2.07% | — | SEC → |
| Feb 07, 2018 | — | 98-0557567 | 4.10% | — | SEC → |
| Jan 19, 2018 | — | (1) BlackRock, Inc. | 10.50% | — | SEC → |
| Feb 14, 2017 | — | Teachers Advisors, LLC | 2.88% | — | SEC → |
| Feb 14, 2017 | — | TIAA-CREF Investment Management, LLC | 4.47% | — | SEC → |
| Feb 09, 2017 | — | Wellington Group Holdings LLP | 3.71% | — | SEC → |
| Feb 09, 2017 | — | Wellington Investment Advisors Holdings LLP | 3.71% | — | SEC → |
| Feb 09, 2017 | — | Wellington Management Group LLP | 3.71% | — | SEC → |
| Feb 07, 2017 | — | 98-0557567 | 5.90% | — | SEC → |
| Oct 07, 2016 | — | (1) BlackRock, Inc. | 10.10% | — | SEC → |
| Feb 11, 2016 | — | Wellington Investment Advisors Holdings LLP | 5.15% | — | SEC → |
| Feb 11, 2016 | — | Wellington Group Holdings LLP | 5.15% | — | SEC → |
| Feb 11, 2016 | — | Wellington Management Group LLP | 5.15% | — | SEC → |
| Feb 10, 2016 | — | Teachers Advisors, Inc. | 2.17% | — | SEC → |
| Feb 10, 2016 | — | (1) BlackRock, Inc. | 8.30% | — | SEC → |
| Feb 10, 2016 | — | TIAA-CREF Investment Management, LLC | 2.51% | — | SEC → |
| Feb 12, 2015 | — | Teachers Advisors, Inc. | 2.00% | — | SEC → |
| Feb 12, 2015 | — | TIAA-CREF Investment Management, LLC | 3.07% | — | SEC → |
| Jan 23, 2015 | — | (1) BlackRock, Inc. | 8.40% | — | SEC → |
| Feb 10, 2014 | — | (1) BlackRock, Inc. | 9.20% | — | SEC → |
| Feb 07, 2014 | — | Hartford Capital Appreciation Fund | 0.00% | — | SEC → |
| Jan 24, 2014 | — | JPMorgan Chase & Co. | 5.50% | — | SEC → |
| Mar 19, 2013 | — | 2. | 5.10% | — | SEC → |
| Feb 14, 2013 | — | 04-2683227 | 13.91% | — | SEC → |
| Feb 13, 2013 | — | Fiduciary Trust Company International | 12.37% | — | SEC → |
| Feb 11, 2013 | — | Hartford Capital Appreciation Fund | 7.76% | — | SEC → |
| Sep 10, 2012 | — | (1) BlackRock, Inc. | 10.18% | — | SEC → |
| Jul 10, 2012 | — | 04-2683227 | 10.10% | — | SEC → |
| May 14, 2012 | — | S.A.C. Capital Advisors, L.P. | 5.20% | — | SEC → |
| May 14, 2012 | — | S.A.C. Capital Associates, LLC | 5.20% | — | SEC → |
| May 14, 2012 | — | Steven A. Cohen | 5.20% | — | SEC → |
Corporate actions combine splits (live, full history), symbol changes (refreshed weekly), the daily M&A wire, and 13D/G filings.