CIEN short interest
Ciena Corporation · Technology · Communication Equipment · settlement date 2026-09-30
| Shares short | 3,868,972 |
|---|---|
| Change vs prior report | 278,070 (+7.7%) |
| Change over six months | -35.3% |
| Days to cover | 1.44 (sector: 2.83) |
| Average daily volume | 2,681,505 |
| Rank in Technology | #562 of 719 by days to cover |
CIEN short interest, last 12 months
| Settlement | Shares short | Change | Days to cover | Avg daily volume |
|---|---|---|---|---|
| 2026-09-30 | 3,868,972 | +7.7% | 1.44 | 2,681,505 |
| 2026-09-15 | 3,590,902 | +7.3% | 1.17 | 3,059,545 |
| 2026-08-31 | 3,345,857 | +14.5% | 1.99 | 1,684,576 |
| 2026-08-14 | 2,921,400 | -21.3% | 1.37 | 2,130,578 |
| 2026-07-31 | 3,711,106 | -7.1% | 1.62 | 2,296,038 |
| 2026-07-15 | 3,993,188 | +3.6% | 2.40 | 1,662,231 |
| 2026-06-30 | 3,853,439 | -19.1% | 1.00 | 4,068,949 |
| 2026-06-15 | 4,760,443 | +5.7% | 1.11 | 4,279,264 |
| 2026-05-29 | 4,505,490 | -0.5% | 2.15 | 2,093,785 |
| 2026-05-15 | 4,529,072 | +3.8% | 2.41 | 1,878,224 |
| 2026-04-30 | 4,365,229 | -7.0% | 2.02 | 2,159,596 |
| 2026-04-15 | 4,693,751 | -21.5% | 1.59 | 2,961,166 |
| 2026-03-31 | 5,977,920 | +18.5% | 1.66 | 3,607,944 |
| 2026-03-13 | 5,044,648 | -19.4% | 1.52 | 3,324,794 |
| 2026-02-27 | 6,258,043 | +11.4% | 2.58 | 2,426,111 |
| 2026-02-13 | 5,619,035 | +32.4% | 1.00 | 6,414,906 |
| 2026-01-30 | 4,244,185 | -28.7% | 1.88 | 2,260,600 |
| 2026-01-15 | 5,952,010 | -8.4% | 2.23 | 2,668,792 |
| 2025-12-31 | 6,498,989 | -11.1% | 3.09 | 2,105,586 |
| 2025-12-15 | 7,308,972 | +14.1% | 2.01 | 3,638,124 |
| 2025-11-28 | 6,406,321 | +9.8% | 1.58 | 4,061,820 |
| 2025-11-14 | 5,836,886 | +42.4% | 1.84 | 3,166,244 |
| 2025-10-31 | 4,098,820 | -7.4% | 1.82 | 2,253,720 |
| 2025-10-15 | 4,426,005 | -8.8% | 1.78 | 2,482,372 |
| 2025-09-30 | 4,852,614 | +21.0% | 1.77 | 2,740,289 |
import finzdata as yf
yf.Ticker("CIEN").short_interest # every report since 2017
yf.Client().short_interest(["CIEN"], start="2018-01-01")Technology short interest · CIEN price history · Who owns CIEN · All short interest