BlackRock, Inc. 13D and 13G filings for Ciena Corporation:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2025-12-04 2:24 pm Purchase | 2025-11-30 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 14,537,914 10.300% | 1,145,053 (+8.55%) | Filing |
| 2025-04-17 09:35 am Sale | 2025-03-31 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 13,392,861 9.400% | -2,903,400 (-17.82%) | Filing |
| 2024-01-30 4:08 pm Sale | 2023-12-31 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 16,296,261 11.300% | -843,663 (-4.92%) | Filing |
| 2023-01-26 08:52 am Unchanged | 2022-12-31 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 17,139,924 11.500% | 0 (Unchanged) | Filing |
| 2023-01-20 09:43 am Purchase | 2022-12-31 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 17,139,924 11.500% | 1,625,549 (+10.48%) | Filing |
| 2022-01-27 1:59 pm Unchanged | 2021-12-31 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 15,514,375 10.000% | 0 (Unchanged) | Filing |
| 2022-01-25 6:45 pm Sale | 2021-12-31 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 15,514,375 10.000% | -362,963 (-2.29%) | Filing |
| 2021-04-09 6:02 pm Purchase | 2021-03-31 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 15,877,338 10.200% | 1,085,289 (+7.34%) | Filing |
| 2021-01-28 5:55 pm Sale | 2020-12-31 | 13G | Ciena Corporation CIEN | BlackRock Inc. BLK | 14,792,049 9.600% | -905,993 (-5.77%) | Filing |