Tower Semiconductor is becoming to photonics what TSMC is to GPUs: a foundry building the next AI stack. It fabricates silicon photonics chips that combine lasers, modulators and detectors on one platform, and is integrating Lightwave Logic into that platform right after massive AI optical spending. As AI networks scale to 800G and 1.6T, photonics becomes the next bottleneck, with limited supply and exploding demand. x.com 

Tower Semiconductor looks set to be the leading silicon-photonics foundry as the path to CPO runs through NPO. First NPO deployments are planned for 2027, with $1.3B of contract value for 2027 alone and more after. A multi-year IQE epi-wafer deal protects it from the InP bottleneck, it is bringing laser-to-silicon bonding in-house, and a dual-track 300 mm plan in Japan aims to quadruple capacity without dilution. Its SiPho coherent modules for Marvell have passed multi-million units. x.com 

Tower Semiconductor's good news looks mostly priced in at a $27 billion market cap, with upside hinging on capacity timing. A reported BofA Buy call with a $367 target rests on Tower's silicon photonics lead, and the numbers have substance: SiPho's run rate rose from $180 million to $680 million in a year, backed by a $1.3 billion 2027 contract. But its Arai, Japan fab reaches full production only in Q4 2027, a delay would push back the 2028 model, and $367 assumes those targets are hit on time. … Show more

Tower Semiconductor's demand should climb as co-packaged optics gains strength, building on a report that Marvell has landed 5 million Tower PIC shipments for AI data-center optics. x.com 

Optics and photonics should be among AI's biggest winners as faster GPU networks need optical connections that suppliers cannot expand quickly enough. Lumentum says some components are sold out through early 2029; Sivers is investing $30M to target more than 100M lasers a year, with operations expected in Q4 2027. Potential US restrictions on Chinese transceivers could reshape supply in 2027. Applied Optoelectronics and Sivers are the favorites. x.com  x.com 

Lightwave Logic could be the next Lumentum because its Perkinamine polymer, spun onto standard silicon wafers, makes modulators with 110GHz+ bandwidth at 50% less power, a big edge at 800G and 1.6T in AI data centers. Tower Semiconductor and GlobalFoundries integrated it in the same week, and four Fortune Global 500 firms are in Stage 3, prototype to product. Its ARM-like royalty model is capital light. The risk is real: it is pre-revenue, with $70M cash and runway into early 2027. x.com 

Tower Semiconductor is a silicon photonics foundry behind the AI optical stack, and the market will price it for where its revenue mix is going. Its silicon photonics revenue doubled in 2025 on hyperscaler demand, more than 70% of capacity is booked through 2028, and it is partnered with Nvidia on next-gen optical modules. As @joedab12 noted, it is not a pure play yet: silicon photonics is still a minority of revenue, but the fastest-growing piece. x.com  x.com 

Tower Semiconductor's stronger-than-expected capacity expansion lets it fill more optical-chip orders itself, reducing customers' incentive to move to foundries they regard as technologically weaker. Its hybrid bonding packs dense connections between photonic chips and their driver electronics, an advantage viewed as effectively unmatched among Western suppliers. Tower remains one of the highest-conviction holdings despite the portfolio trim. x.com 

Tower Semiconductor's earnings call carried strong commentary, and the stock's steady performance makes it a calmer holding than Nebius. Its year-to-date and one-year trend show a steep angle of ascent, suiting an investor who cannot watch the screen all day. Proceeds from exiting Nebius go to Tower, with another third to be added. x.com  x.com 

Tower Semiconductor's silicon photonics demand is accelerating earnings, supporting a Buy with a $260 target, or 26x 2027E EPS. 2Q26 revenue rose 24% to $460M and operating profit 125%, with an EPS beat on utilization and mix. 3Q26 guidance is a record $520M, up 31% YoY. Hyperscalers have locked in $1.3B of 2027 SiPho revenue, 2028 wafer commitments should exceed 2027, and new customers are qualifying. 2026/27 EPS estimates rise to $4.5 and $10, with NPO volume ramping in 2H27. x.com