New York, Jan 5, 2026, 13:20 EST — Regular session
- Ciena shares slid about 7.8% midday, reversing an early spike to a fresh intraday high.
- The drop came as the broader U.S. market held gains, while optical peer Lumentum also fell sharply.
- Investors are weighing valuation after Ciena’s late-2025 surge, with attention turning to the next update cycle.
Ciena Corp shares were down about 7.8% at $226.75 in midday New York trading on Monday, after touching $253.30 earlier in the session and then sliding to a low of $223.61.
The move stood out against a firmer tape: the S&P 500 ETF and Nasdaq 100 ETF were both higher, while optical components maker Lumentum dropped about 7.7%, pointing to a broader unwind in parts of the AI-networking trade.
Why it matters now is valuation. In a note published Monday, Zacks Equity Research highlighted Ciena’s premium multiple — a forward price-to-earnings ratio, a valuation gauge based on expected profit — while reiterating management’s fiscal 2026 revenue outlook of $5.7 billion to $6.1 billion and pointing to roughly $5 billion in backlog, or orders not yet recognized as revenue. Nasdaq
Short positioning has also crept higher. Yahoo Finance data show about 7.31 million Ciena shares were sold short as of Dec. 15 — stock borrowed and sold by traders betting on declines — representing 8.42% of float, the shares available for public trading. Yahoo Finance
The stock’s sharp run into year-end left it exposed to fast reversals. Ciena’s investor relations site shows shares closed at $246.06 on Jan. 2 after hitting $248.50, a 52-week high. Ciena Investor Relations
Recent disclosures have been light. Ciena’s SEC-filings page lists a Form 144 filed on Jan. 2, a notice tied to planned sales of restricted stock, alongside late-December insider transaction reports. Ciena Investor Relations
Some valuation models circulating among retail platforms have added to the debate. Simply Wall St, using a discounted cash flow model, flags the stock as trading above its estimate of fair value — one of several frameworks investors use to stress-test expectations after big runs. Simply Wall St
The bigger risk is that the market starts demanding a higher return to hold high-multiple AI-linked names. “You need a pin that pricks the bubble and it will probably come through tighter money,” said Trevor Greetham, head of multi-asset at Royal London Asset Management, in a Reuters report on inflation risks tied to heavy AI investment. Reuters
Technically, traders often watch the day’s extremes for clues on where buyers and sellers step in. Ciena has swung between roughly the low-$220s and low-$250s on Monday’s range, putting the $223 area in focus as near-term support and the $250 region as the next resistance. Investing
