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US semiconductor stocks staged a powerful single-day rally. On September 21, the Philadelphia Semiconductor Index closed up 4.29% at 12,398.17, marking its best daily performance since August 4. AMD rose roughly 10%, with its market cap crossing USD 1 trillion for the first time (up 186% year-to-date), becoming the fourth US chip firm to join the “trillion-dollar club”. ARM climbed more than 17%, Intel over 12%, and Qualcomm above 9%. In optical communications, Astera Labs gained over 12% and Credo more than 6%. Capital flowed back into AI hardware amid optimistic expectations for the China-US presidential talks.
Mature nodes shift from inventory restocking to structural shortage. UMC signaled “meaningful price hikes” in 2027. Some products of Powerchip are reportedly seeing price increases of up to 40% (memory foundry prices already rose 45% in July). Capacity utilization rates at the three major foundries are approaching 90%. Institutional estimates show the global 8-inch supply-demand ratio will fall to -1.2% in 2027, officially entering a supply-constrained market.
Memory price hikes continue and HBM forecasts are revised upward. TrendForce raised its projected Q3 NAND contract price increase to 18%–23%. Micron guided Q4 net profit of approximately USD 35 billion for FY2026, and its FY2027 profit may surpass Microsoft. JPMorgan lifted Samsung’s HBM value market share to 34% in 2026 and 39% in 2027, forecasting a 64% YoY rise in blended HBM ASP for FY2027.
Advanced packaging capacity expansion accelerates. TSMC’s Kaohsiung Baipu Industrial Park broke ground on September 21. The site will host a technology validation lab and talent training center, scheduled to commence operations in Q4 2029. Intel partnered with AUO to develop advanced packaging for Micro LED substrates, targeting CPO and high-density computing integration.
Spillover from structural component shortages: Samsung Electro-Mechanics implemented a 30% across-the-board price increase starting August 1. High-capacity MLCC for AI servers saw manufacturer price hikes of 15%–35%. A single GB200 NVL72 rack requires roughly 440,000 MLCCs. High-end domestic AI orders for leading suppliers are booked through Q2 2027.
In-depth Analysis
Optical Communications / Optical Chips: Eoptolink stated its 1.6T optical modules have entered sustained ramp-up with accelerating shipment cadence amid tight supply chains. The firm adopts volume-locking agreements and prepayments to secure material stock in advance. Coherent launched a compact QSFP-packaged full C-band high-power POLS targeting 800G ZR/ZR+. A single fiber pair supports 32-channel DWDM with a maximum bandwidth of 25.6 Tbps. Marvell and GlobalFoundries are ramping production of high-speed optical interconnect chips for AI. On the demand side, NVIDIA has notified major clients of broad price hikes exceeding 15% for AI chip servers, and Nebius raised GPU cloud rental prices again by 17%–21%. Price increases are propagating from computing power to server hardware and optical modules.
Advanced Packaging & Testing：TSMC’s Kaohsiung Baipu campus serves as an on-site verification hub for advanced packaging equipment and materials, designed to shorten mass-production cycles for new technologies. Intel is negotiating cooperation with AUO on advanced packaging for Micro LED substrates to explore CPO and high-density computing integration. Morgan Stanley maintains its view that China’s advanced packaging market will reach RMB 100 billion by 2029, yet equipment vendors offer stronger revenue certainty than packaging & testing houses. No new updates on price hikes or capacity expansion for upstream ABF films / IC substrates today. There is no fresh progress on domestic substitution of build-up films including CBF/NBF/GBF; this segment is marked “no major developments today”.
SiC / Power Semiconductors: Ma Donghui of Li Auto responded publicly for the first time that the company’s Maher chips and SiC modules can be supplied externally (PACK assemblies are not available for external sales). Jiejie Microelectronics stated it only performs small-batch packaging and testing for SiC devices with mass production yet to kick off. Demand fundamentals are strengthening: Morgan Stanley estimates power semiconductors for AI servers deliver 8–18 times the value per unit compared with traditional servers, and AI-related orders have occupied over 30% of mature wafer capacity. The 8-inch power platform remains tight; related foundry quotations rose 5%–15% across the board in Q2, and the industry is preparing for a third round of price hikes from H2 this year to 2027.
Memory & Compute Chips: Samsung management stated unmet demand in 2026 will carry over into 2027, with next year’s supply-demand balance tighter than this year, and long-term contracts backed by substantive prepayments. Apple has accepted Samsung’s 2027 Q1 memory quotation (+30%–40% YoY). On the computing side, NVIDIA plans an additional USD 1.5 billion investment ahead of SB Energy’s US IPO, lifting total committed capital to USD 3 billion. Aolani partners with NVIDIA to expand Southeast Asian AI factories, with 22,000 GPUs to be deployed across Malaysian and Philippine plants in early 2027.
Equipment & Materials: Lead times for core components of Korean semiconductor equipment have generally more than doubled, with critical Japanese components waiting up to 40 months, opening windows for domestic component suppliers. Jiwei’s statistics show 52 semiconductor equipment component firms booked combined revenue of RMB 55.50 billion in H1 2026 (+16.9% YoY) and attributable net profit of RMB 8.639 billion (+49.7% YoY). Stripping out a one-off gain of RMB 1.778 billion from KMC, the underlying growth stands at roughly 20.8% (non-recurring profit +19.3%). Eleven firms posted losses, and the top 3 players capture a CR3 profit concentration ratio of 51.5%. Advanced ceramics (+52.9%) and precision motion spindles (+63.4%) lead the upturn. Jiwei Consulting released the 2026 Research Report on Diamond for Semiconductors. The global market reached approximately USD 1.38 billion in 2025 and is projected to surpass USD 16 billion by 2032 (CAGR ~50%). China’s domestic thermal dissipation market will near RMB 400 million in 2026 and exceed RMB 20 billion by 2032. Huanghe Whirlwind has taken the lead in mass-producing 8-inch polycrystalline diamond heat spreaders.
Wafer Fabrication: UMC lifted capacity utilization from 79% in Q1 to 85% in Q2; gross margin expanded from 29.2% to 32.5%. Q3 utilization is expected to exceed 90% with gross margin at 34%–36%. Vanguard International Semiconductor posted Q2 revenue of TWD 14.245 billion (+13.7% QoQ), ASP up 3% QoQ. Powerchip’s August consolidated revenue hit TWD 7.009 billion, a 50-month high. Pricing logic has shifted to a three-dimensional framework: process platform, locked customer volume, and automotive/industrial qualification grades. Average quotations for mature nodes are expected to rise 4%–8% in 2026. Huahong Grace stated orders for MCU, memory and AI-related products stand at 1.5–2x of current capacity.
Policy & Macro Environment: Fed’s Musalem said interest rates may need further increases, advocating “early and gradual” rate hikes. Trump stated he will “only encourage” AI overall. EU member states agreed to extend Russia sanctions for three additional years. Domestically, superhard materials (diamond) have been added to export control lists by China, the US and Japan sequentially, elevating their strategic importance.
Daily Investment Tips
1. The highest-conviction main track lies in mature nodes / 8-inch wafers and their supporting price-hike chain for power devices, power management ICs and MCUs. Automotive/industrial-grade platforms with high certification barriers will see price gains closer to the upper end of the range. However, the risk of long-term oversupply after 2027 from concentrated capacity expansion by mainland Chinese manufacturers has been flagged in mid-year report risk disclosures; cyclicality remains intact.
2. The price-hike narratives for memory and advanced packaging will face critical validation with Micron’s earnings release at month-end. Structural shortages in components (high-capacity MLCCs, equipment components) are spilling over from AI servers to automotive-grade applications. Lead times and price increase notices from overseas large manufacturers serve as core tracking metrics. Risks include valuation pressure on high-growth stocks amid the Fed’s hawkish liquidity stance, plus repeated market swings around the “AI demand slowdown” thesis.
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