AT&T announced a multi-year agreement with Corning valued at over $3 billion, under which Corning will supply optical fiber and cable to support AT&T's network expansion. The landmark deal provided a direct catalyst for the pre-market rally, helping offset lingering concerns over a previously disclosed $2 billion equity distribution agreement with Goldman Sachs that had triggered a sharp selloff of over 13% in prior sessions.

Corning rose 3.3% in pre-market trading.

Adding to positive sentiment, Corning recently collaborated with Qualcomm and Lumentum to demonstrate a high-density optical die-to-die interconnect solution for AI scale-up systems at ECOC in Spain, reinforcing its positioning in AI data center optical communications. Corning also announced capacity expansion for its Polarcor glass polarizer products, further strengthening its AI photonics pipeline. The broader optical communications sector rallied in tandem, with peers Coherent up 1.51%, Amphenol up 1.63%, and Belden up 1.99%.

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