Tower Semiconductor jumps on AI silicon photonics contracts to $38B

Tower Semiconductor saw its market cap surge to about $37.7–$38B in mid-June 2026, briefly becoming Israel’s most valuable publicly traded company and overtaking Teva Pharmaceutical. The rally was driven by AI infrastructure demand for silicon photonics, which enables high-speed optical data transmission between server racks. Momentum built after Tower Semiconductor’s May 13 Q1 2026 update. Revenue rose to $414M (+15% YoY). The company also disclosed $1.3B in new silicon photonics contracts aimed at generating revenue in 2027, all tied to AI applications. Shares then climbed more than 17% intraday. Tower Semiconductor added that it is collaborating with NVIDIA on 1.6T optical modules and showcased related progress at OFC 2026. However, the “crown” was short-lived. By late June 2026, Tower Semiconductor’s market cap retreated to roughly $32–$34B (about 10–11% below the peak), falling back below peers such as Bank Leumi and Teva. Tower operates fabrication facilities in Israel, the US, Japan, and Italy, producing both 200mm and 300mm wafers. For the broader AI supply chain, silicon photonics is increasingly viewed as a potential bottleneck. The $1.3B forward-looking contract figure suggests customers are locking in supply early. Still, the rapid run-up and quick pullback underline stock-volatility risk. Tower Semiconductor has no reported ties to crypto or blockchain; this is a traditional semiconductor story.