Ciena shares plunge after Q2 beat as investors seek bigger AI gains

Ciena shares fell more than 19% in early trading Thursday after the networking equipment maker reported fiscal second-quarter results that beat analyst estimates but left some investors seeking greater AI-related upside.

For the quarter, adjusted earnings were $1.64 per share, up from $0.42 a year earlier and above the FactSet consensus of $1.46. Revenue rose 40% year over year to $1.57 billion, topping estimates of $1.51 billion.

The company raised its fiscal 2026 revenue outlook to a range of $6.2 billion to $6.4 billion from $5.9 billion to $6.3 billion. Analysts had been modeling about $6.18 billion. Ciena also projected third-quarter revenue between $1.58 billion and $1.68 billion, above Wall Street’s $1.56 billion estimate.

Investor reaction focused on expectations that had built into Ciena’s stock after a strong run this year. Through Wednesday’s close the shares had climbed roughly 165% in 2026. The early drop was the company’s largest one-day percentage decline since Jan. 27, 2025; later in the session the stock was trading about 14.6% below the prior close.

UBS analyst David Vogt wrote that the market had been pricing in a “more material beat and raise” than Ciena delivered.

The broader optical networking sector also pulled back after a sharp rally earlier in the week. Peer suppliers Lumentum, Coherent and Corning have all gained more than 100% so far in 2026. Industry demand has been linked to hyperscale data center buildouts tied to artificial intelligence, and some investors consider optical components a potential bottleneck for scaling AI infrastructure.

In a press release, Ciena Chief Executive Gary Smith said, “Our long-term strategy to be the global leader in high-speed connectivity – both across the WAN and in and around the data center – is tightly aligned to the structural, multi-year opportunities created by AI-driven demand.”

Ciena’s reported results and the higher revenue outlook exceeded analyst estimates but market moves indicated investors were looking for clearer signs that AI-related demand will drive sustained and outsized revenue growth.