Corning (GLW) Stock Pops 11% as Analysts Turn More Bullish on Fiber Demand

TLDR

• Corning (GLW) stock rose 11.16% after a Zacks upgrade to Rank #2 (Buy)
• UBS reiterated a Buy rating with a $171 price target on March 19
• UBS attended the Optical Fiber Communications conference and flagged strong fiber demand
• The fiber market is being described as a “seller’s market” due to limited supply
• Zacks Consensus Estimate for Corning’s 2026 EPS has risen 3.3% over the past three months

Corning (GLW) stock jumped over 11% on Tuesday after two bullish signals landed in quick succession — a Zacks upgrade and a UBS Buy reiteration backed by fresh industry intel.

Corning Incorporated, GLW

Zacks upgraded Corning to a Rank #2 (Buy), driven by upward revisions to earnings estimates. The Zacks system tracks EPS estimates from sell-side analysts and flags stocks where the earnings outlook is improving.

Over the past three months, the Zacks Consensus Estimate for Corning’s fiscal year 2026 EPS has climbed 3.3%. The company is expected to earn $3.10 per share for the year ending December 2026.

That figure represents no year-over-year change, but the trend in revisions is what matters to Zacks. Rising estimates signal that analysts covering the stock are getting more optimistic about the business.

The Zacks Rank #1 and #2 categories cover only the top 20% of the more than 4,000 stocks the firm monitors, giving the upgrade some weight.

UBS Points to Strong Fiber Demand

On the analyst side, UBS separately reiterated its Buy rating on GLW on March 19, keeping its price target at $171.

The reiteration came after UBS attended the Optical Fiber Communications conference, where the firm met with fiber producers, sellers, and other key players in the supply chain.

The takeaway from the conference was clear: demand for fiber remains very strong. UBS noted that industry participants are describing the fiber market as a “seller’s market,” meaning supply is struggling to keep up with demand.

That dynamic supports pricing power for Corning in its optical-communications segment and gives the company better visibility into future revenues from that business.

Mixed Signals on Copper vs. Optical Inside AI Racks

One open question is how quickly optical fiber will replace copper connections inside AI server racks. UBS’s conversations with hyperscalers and optical suppliers produced “mixed” views — some expect faster adoption of optical, others slower.

UBS also pointed to Nvidia’s GTC roadmap, which showed continued investment in both copper and optical inside the rack. That means the transition isn’t a clean one-way story, at least not yet.

Still, UBS’s overall read on the fiber market was positive enough to hold the Buy rating and the $171 price target.

The Zacks upgrade, layered on top of the UBS stance, appears to have been enough to push GLW higher on Tuesday, with the stock closing up 11.16%.

Corning’s Zacks Consensus Estimate for 2026 EPS now stands at $3.10, reflecting the 3.3% upward revision over the last three months.

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