| Sep 20, 2026 | CIENEVP & Chief Customer Officer | Shares withheld for tax or exercise priceCode F · direct | 268 | $348.80 | $93K@ $348.80 | 60,017 | Form 4 |
| Sep 20, 2026 | CIENEVP & Chief Customer Officer | Shares withheld for tax or exercise priceCode F · direct | 503 | $348.80 | $175K@ $348.80 | 60,285 | Form 4 |
| Sep 20, 2026 | CIENEVP & Chief Customer Officer | Shares withheld for tax or exercise priceCode F · direct | 859 | $348.80 | $300K@ $348.80 | 60,788 | Form 4 |
| Sep 20, 2026 | CIENEVP & Chief Customer Officer | Shares withheld for tax or exercise priceCode F · direct | 735 | $348.80 | $256K@ $348.80 | 61,647 | Form 4 |
| Jul 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 2,629 | $466.20 | $1.2M@ $466.20 | 62,382 | Form 4 |
| Jun 20, 2026 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 268 | $428.22 | $115K@ $428.22 | 65,011 | Form 4 |
| Jun 20, 2026 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 504 | $428.22 | $216K@ $428.22 | 65,279 | Form 4 |
| Jun 20, 2026 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 859 | $428.22 | $368K@ $428.22 | 65,783 | Form 4 |
| Jun 20, 2026 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 735 | $428.22 | $315K@ $428.22 | 66,642 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 162 | $417.07 | $68K@ $417.07 | 67,377 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 1,029 | $416.56 | $429K@ $416.56 | 68 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 400 | $415.20 | $166K@ $415.20 | 68,568 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 1,708 | $414.16 | $707K@ $414.16 | 68,968 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 2,279 | $413.35 | $942K@ $413.35 | 70,676 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 3,441 | $412.24 | $1.4M@ $412.24 | 73 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 3,100 | $411.23 | $1.3M@ $411.23 | 76,396 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 3,250 | $408.75 | $1.3M@ $408.75 | 79,996 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 460 | $407.48 | $187K@ $407.48 | 83,246 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 600 | $406.45 | $244K@ $406.45 | 83,706 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 2,100 | $405.07 | $851K@ $405.07 | 84,306 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 750 | $403.90 | $303K@ $403.90 | 86,406 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 500 | $402.82 | $201K@ $402.82 | 87,156 | Form 4 |
| Apr 1, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 1,735 | $401.58 | $697K@ $401.58 | 87,656 | Form 4 |
| Mar 20, 2026 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 506 | $383.89 | $194K@ $383.89 | 89,391 | Form 4 |
| Mar 20, 2026 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 863 | $383.89 | $331K@ $383.89 | 89,897 | Form 4 |
| Mar 20, 2026 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 736 | $383.89 | $283K@ $383.89 | 90,760 | Form 4 |
| Mar 20, 2026 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 269 | $383.89 | $103K@ $383.89 | 91,496 | Form 4 |
| Jan 15, 2026 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 21,383 | $247.89 | $5.3M@ $247.89 | 91,765 | Form 4 |
| Dec 20, 2025 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 1,664 | $230.34 | $383K@ $230.34 | 113,148 | Form 4 |
| Dec 20, 2025 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 2,437 | $230.34 | $561K@ $230.34 | 114,812 | Form 4 |
| Dec 20, 2025 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 2,120 | $230.34 | $488K@ $230.34 | 117,249 | Form 4 |
| Dec 20, 2025 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 9,484 | $230.34 | $2.2M@ $230.34 | 119,369 | Form 4 |
| Dec 20, 2025 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 489 | $230.34 | $113K@ $230.34 | 128,853 | Form 4 |
| Dec 20, 2025 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 508 | $230.34 | $117K@ $230.34 | 129,342 | Form 4 |
| Dec 20, 2025 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 867 | $230.34 | $200K@ $230.34 | 129,850 | Form 4 |
| Dec 20, 2025 | CIENSVP Global Sales and Marketing | Shares withheld for tax or exercise priceCode F · direct | 741 | $230.34 | $171K@ $230.34 | 130,717 | Form 4 |
| Dec 16, 2025 | CIENSVP Global Sales and Marketing | Grant or awardCode A · direct | 9,650 | — | — | 131,458 | Form 4 |
| Dec 16, 2025 | CIENSVP Global Sales and Marketing | Grant or awardCode A · direct | 21,196 | — | — | 121,808 | Form 4 |
| Dec 16, 2025 | CIENSVP Global Sales and Marketing | Grant or awardCode A · direct | 20,368 | — | — | 100,612 | Form 4 |
| Oct 1, 2025 | CIENSVP Global Sales and Marketing | Open-market saleCode S · direct | 1,984 | $143.42 | $285K@ $143.42 | 80,244 | Form 4 |