Ciena Corporation (NYSE: CIEN), a leading provider of optical networking equipment, saw its shares tumble 12.88% Thursday, March 5, 2026, closing at $299.30 after a volatile session tied to its fiscal first-quarter 2026 earnings report. The stock opened at $312.01, hit a high of $315.50 early but plunged to a low of $278.39 amid heavy selling, with volume surging to about 7.85 million shares — well above average — as investors digested the results.
The sharp decline followed Ciena's release of record quarterly revenue of $1.43 billion, up 33% year-over-year and exceeding analyst estimates. Adjusted earnings per share came in at $1.35, beating consensus forecasts of around $1.17. The company highlighted strong demand for its optical networking solutions, driven by AI infrastructure buildouts from hyperscalers and cloud providers. A robust backlog of approximately $7 billion underscored sustained momentum in high-speed connectivity needs.
