--- title: "Tower's Innolight filing says the AI optics silicon is still in its fabs; the tape disagrees" description: "A 6-K filed November 3, 2026, puts Innolight's first near-package optics device into production inside Tower's fabs, hours after the foundry printed record results and its stock fell 6.70%. The filing says the silicon is still made by Tower; the market is pricing in a rival foundry winning the same customer's chips." publisher: "The Inference" section: "Chips" published: 2026-11-03T16:08:23.854Z modified: 2026-11-03T16:08:23.854Z canonical: https://theinference.org/article/tower-s-innolight-filing-says-the-ai-optics-silicon-is-still-in-its-fabs-the-tape-disagrees language: en keywords: "Semiconductors, Silicon Photonics, Foundries, Optical Networking, AI Infrastructure" --- # Tower's Innolight filing says the AI optics silicon is still in its fabs; the tape disagrees > A 6-K filed November 3, 2026, puts Innolight's first near-package optics device into production inside Tower's fabs, hours after the foundry printed record results and its stock fell 6.70%. The filing says the silicon is still made by Tower; the market is pricing in a rival foundry winning the same customer's chips. On November 3, 2026, [Tower Semiconductor](https://theinference.org/markets/companies/tower-semiconductor) [filed a 6-K with the SEC](https://www.sec.gov/Archives/edgar/data/928876/000117891326004972/0001178913-26-004972-index.htm) that no wire had picked up: Innolight, the world's largest maker of data-center optical transceivers, has its first near-package optics device in early production on Tower's PH18M silicon photonics flow, with more NPO products taped out on Tower's 300mm platform [1]. The filing landed the morning after Tower [printed the best quarter in its history](https://towersemi.com/2026/11/02/11022026/) and its stock still closed down 6.70% at $155.32 [3]. The market's worry is not the numbers; it is that UMC, the Taiwanese foundry, [has reportedly won photonic integrated circuit orders](https://www.trendforce.com/news/2026/11/02/news-umc-reportedly-wins-photonic-integrated-circuit-orders-initial-volume-may-hit-10k-wafers-at-7x-cmos-process-pricing/) from that same customer, Innolight, and from [Tencent](https://theinference.org/markets/companies/tencent)-backed SILITH, at seven times conventional CMOS pricing [5]. ## What the new optics shift means for Tower NPO is the step after pluggable optics, the modules that link AI servers today. An NPO device integrates 16 or more optical channels on one die and typically replaces the digital signal processor with silicon-germanium amplifiers and drivers [1][3]. That moves more silicon content into the foundry. Tower says most analysts see NPO doubling the optical transceiver market, and it is prototyping NPO with more than ten of its top customers [3]. Innolight's CTO called NPO "a key technology for next-generation AI and cloud infrastructure" [1]. ## The receipts, and the gap The quarter behind the filing: revenue of $526 million, up 33% year over year; record net profit of $120 million at a 23% margin; Q4 guided to $600 million, closing 2026 at $2 billion with a $2.4 billion exit run rate [2]. Silicon photonics ran about $240 million in Q3, targeted at a $1.1 billion annualized rate in Q4, five times 2025 [2][3]. *Chart: **Photonics is guided from about $240 million a quarter to $700 million by Q3 2027** Column chart of Tower Semiconductor's quarterly silicon photonics revenue: about $240 million in Q3 2026, an implied $275 million pace in Q4 2026 from a $1.1 billion annualized target, and a company target of roughly $700 million by Q3 2027.* *Silicon photonics revenue by calendar quarter, US dollars. The Q4 2026 bar is the quarterly equivalent of Tower's $1.1 billion annualized target and the Q3 2027 bar is the company's own revenue target; both are estimates, not reported figures. Sources: Tower Q3 2026 results release [2] and earnings call [3]. [2][3]* Customers prepay: advances rose $305 million over nine months, cushioning $191 million of quarterly capex against $185 million of operating cash flow [2]. Capacity roughly doubles by year end, triples with Japan's Track-1, and is "[spoken for](https://theinference.org/article/tower-semiconductor-guides-to-a-2-4-billion-run-rate-as-ai-optics-customers-prepay-through-2029)" through contracts extended to 2029 [3]. *Chart: **Record Q3 revenue of $526 million, guided to $600 million next quarter** Tower Semiconductor quarterly revenue: $396 million in Q3 2025, $460 million in Q2 2026, a record $526 million in Q3 2026, and Q4 2026 guided to $600 million.* *Tower Semiconductor quarterly revenue in US dollars; Q4 2026 is the mid-point of company guidance. Sources: Tower Q3 2026 results release [2] and earnings call [3]. [2][3]* ## What the sellers are pricing Here is the tension. UMC's reported win means Tower's cornerstone customer is also buying from a rival; UMC would not comment [5]. Q3's gross margin came in near 34% against Tower's own updated model of 45%, a gap the company bridges partly with price increases of up to 20% [3][4]. Wedbush [cut its price target](https://uk.investing.com/news/stock-market-news/wedbush-cuts-tower-semiconductor-stock-price-target-on-market-headwinds-93CH-4951900) on November 3 citing market headwinds [6]. CEO Russell Ellwanger, asked about the nearly 50% fall from the summer share-price peak: "There has been no change in demand, nor are there any headwinds" [4]. The bet is narrow and checkable: whether NPO keeps its silicon inside Tower's fabs, and whether gross margin walks toward 45% [3][4]. The next readings are Q4 results and the company's own target of roughly $700 million of quarterly photonics revenue by Q3 2027 [3][4]. ## Takeaway Tower's own filing confirms Innolight's first NPO device is in early production on Tower's PH18M photonics flow, but the stock is pricing a reported UMC win at the same customer and a 34% gross margin against Tower's own 45% model; the checkable tests are Q4 results and roughly $700 million of quarterly photonics revenue by Q3 2027. ## Sources 1. [SEC Form 6-K, Tower Semiconductor and Innolight Advance Near-Package Optics, 3 November 2026](https://www.sec.gov/Archives/edgar/data/928876/000117891326004972/0001178913-26-004972-index.htm) 2. [Tower Semiconductor press release, Third Quarter Record Results, 2 November 2026](https://towersemi.com/2026/11/02/11022026/) 3. [Tower Semiconductor Q3 2026 Earnings Call Transcript, 2 November 2026](https://stockanalysis.com/stocks/tsem/transcripts/723781-q3-2026/) 4. [Calcalist Tech, Tower CEO says AI demand remains intact, 3 November 2026](https://www.calcalistech.com/ctechnews/article/7cpy7fnk2) 5. [TrendForce, UMC Reportedly Wins Photonic Integrated Circuit Orders, 2 November 2026](https://www.trendforce.com/news/2026/11/02/news-umc-reportedly-wins-photonic-integrated-circuit-orders-initial-volume-may-hit-10k-wafers-at-7x-cmos-process-pricing/) 6. [Investing.com UK, Wedbush cuts Tower Semiconductor stock price target, 3 November 2026](https://uk.investing.com/news/stock-market-news/wedbush-cuts-tower-semiconductor-stock-price-target-on-market-headwinds-93CH-4951900) --- Tower's Innolight filing says the AI optics silicon is still in its fabs; the tape disagrees — The Inference. Canonical: https://theinference.org/article/tower-s-innolight-filing-says-the-ai-optics-silicon-is-still-in-its-fabs-the-tape-disagrees