Ciena Corp. short interest
Short interest in Ciena Corp. was 3.3 million shares at the 31 August 2026 settlement, up 14.5% on the previous settlement, with 1.99 days to cover at an average daily volume of 1.7 million shares, as reported to FINRA.
| Settlement | Shares short | Change | Average daily volume | Days to cover |
|---|---|---|---|---|
| 31 August 2026 | 3,345,857 | +14.5% | 1,684,576 | 1.99 |
| 14 August 2026 | 2,921,400 | -21.3% | 2,130,578 | 1.37 |
| 31 July 2026 | 3,711,106 | -7.1% | 2,296,038 | 1.62 |
| 15 July 2026 | 3,993,188 | +3.6% | 1,662,231 | 2.40 |
| 30 June 2026 | 3,853,439 | -19.1% | 4,068,949 | 1.00 |
| 15 June 2026 | 4,760,443 | +5.7% | 4,279,264 | 1.11 |
| 29 May 2026 | 4,505,490 | -0.5% | 2,093,785 | 2.15 |
| 15 May 2026 | 4,529,072 | +3.8% | 1,878,224 | 2.41 |
| 30 April 2026 | 4,365,229 | -7.0% | 2,159,596 | 2.02 |
| 15 April 2026 | 4,693,751 | -21.5% | 2,961,166 | 1.59 |
| 31 March 2026 | 5,977,920 | +18.5% | 3,607,944 | 1.66 |
| 13 March 2026 | 5,044,648 | -19.4% | 3,324,794 | 1.52 |
FINRA publishes consolidated short interest twice a month, about ten days after each settlement. Days to cover is shares short over average daily volume. Short interest as a share of the float is not shown: the float is not in the public record.
Source
FINRA equity short interest data, the public dataset.
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