On Monday, the U.S. semiconductor sector staged a significant rebound after enduring a prolonged multi-day decline, with the Philadelphia Semiconductor Index, which tracks global chip giants including Nvidia, AMD, Intel, and Micron, surging approximately 3% in early trading.

Almost simultaneously with the semiconductor sector launching its counteroffensive on Monday, Wall Street financial giant Morgan Stanley released a research report on the further acceleration of semiconductor equipment spending expansion, effectively adding fuel to the semiconductor sector's phase-bottom rebound momentum. The report emphasized that the global semiconductor equipment supply chain—closely tied to chip manufacturing capacity, including lithography machines, etching, thin-film deposition, CMP, advanced packaging, and process yield monitoring—continues to expand capacity for a larger AI investment cycle.

According to market data, as of October 16, the Philadelphia Semiconductor Index had fallen for eight consecutive trading days, accumulating a decline of approximately 15.7%. Last week alone it dropped 11.4%, pulling back about 24% from its peak and entering technical bear market territory. The memory sector came under particularly heavy pressure, with U.S. memory chip manufacturing giant Micron's stock plunging 14.6% last week.

South Korea's KOSPI index, often called the "barometer of AI computing trades," fell approximately 14.5% last week. Although it rose 1.76% on Monday, it has still declined about 15.6% since the start of October. This round of adjustment has evolved from high-level profit-taking into a concentrated reassessment by the market of the sustainability of strong AI computing capital expenditures and the ability to realize future AI profits amid rising financing costs for AI infrastructure.

In early trading on Monday, the market began to repair this sharp selloff. As of 21:37 Beijing time on October 19, the Philadelphia Semiconductor Index rose 2.88% to 11,458.24 points. Based on historical closing data, it has still declined about 9.3% since the start of October and remains approximately 21.8% below its high, yet its year-to-date gain still stands at 61.8%. Opening quotes at 21:35 Beijing time showed ASML, Lam Research, and Applied Materials rising 2.35%, 3.84%, and 3.74% respectively, while Micron gained 3.92%.

The coexistence of a significant phase-level decline alongside substantial year-to-date gains means the market is re-evaluating just how much of the strong growth expectations previously priced into stocks can actually be delivered.

Morgan Stanley's October 19 report titled "Semiconductor Capital Equipment: SEMICON West Recap" maintained an "In-Line" view on the North American semiconductor equipment industry, projecting global wafer fab equipment spending (WFE) to reach $223 billion in 2027, representing 37% year-over-year growth. The supply chain is strengthening its willingness to expand capacity, preparing for an optimistic scenario of $280 billion in 2028, though component shortages and customer cleanroom delays have already emerged.

The research report also focused on three main themes: Applied Materials' push into process control, MKS and Advanced Energy addressing supply bottlenecks, and advanced packaging increasing testing value. It supports the judgment that equipment demand remains resilient while also indicating that the next round of global semiconductor industry earnings upgrades requires more solid evidence of actual deliveries.

In terms of specific allocations, MKS (MKSI.US) and Advanced Energy (AEIS.US), which received relatively positive feedback from this Morgan Stanley semiconductor equipment industry exchange, both carry "Overweight" ratings. KLA (KLAC.US), Lam Research (LRCX.US), and Onto Innovation (ONTO.US) also carry "Overweight" ratings. Applied Materials (AMAT.US), Camtek (CAMT.US), Nova (NVMI.US), and Teradyne (TER.US) are rated "Equal Weight."

As the Philadelphia Semiconductor Index welcomes Monday's rebound after its deep decline, Morgan Stanley's latest research provides strong industrial support for the long-term growth prospects and bullish tone of semiconductor equipment and the broader semiconductor sector: AI-related equipment demand remains strong, the supply chain is ramping up capacity expansion, and preparations are underway for a larger-scale investment cycle. As growth drivers shift further from improving existing capacity utilization toward ramping new capacity, the key to the next phase of earnings realization lies in whether equipment suppliers' capacity expansion, key component supply, and customer wafer fab construction can advance in sync, converting robust demand into revenue delivered on schedule.

$223 Billion Growth Must Pass the Delivery Test as AI-Related Semiconductor Equipment Expansion Enters a More Difficult Phase

Growth in 2026 will mainly come from improving existing capacity utilization, while 2027 must rely on ramping new capacity. Morgan Stanley's analyst team noted that the industry's annualized run-rate has risen from approximately $125 billion in Q4 2025 to about $200 billion in Q4 2026; this $200 billion figure is a quarterly annualized run-rate and cannot be directly treated as full-year spending. Entering 2027, even achieving the $223 billion base case forecast requires suppliers to build and bring new capacity online.

Morgan Stanley stated that major sub-suppliers mentioned during exchanges that Applied Materials plans to double capacity by 2028, and more companies worry that falling behind in expansion will cede orders to competitors, making them willing to commit resources for the optimistic 2028 scenario of $280 billion. This shows the industry is still allocating capital for growth, but equipment manufacturing, personnel training, and supplier qualification will make growth realization more complex.

Real constraints have already appeared simultaneously on both the equipment manufacturing side and the wafer fab receiving side. Morgan Stanley's research shows that PCB suppliers are prioritizing AI customer demand, squeezing supply quotas for equipment subsystem manufacturers; another DRAM customer delayed equipment delivery from the December quarter to the following March quarter because its cleanroom was not ready. Such delays first affect equipment revenue recognition and the timing of wafer capacity release.

Meanwhile, Morgan Stanley indicated that North American semiconductor equipment supplier MKS stated about 95% of its supplier supply situations require no concern, with the remaining 5% needing focused management. Some competitors are ramping more slowly, and customers have already asked MKS to increase supply of dual-sourced products. Both MKS and Advanced Energy have proactively built inventory of potentially scarce components ahead of time, which Morgan Stanley views positively. The investment implication behind this is that a small number of components can bottleneck entire system deliveries, making supply chain execution capability convertible into market share.

Valuation adjustments have also changed the conditions required for further gains. Morgan Stanley's 2026 forecasts had previously been revised upward by a cumulative 26%, and the market had grown accustomed to consistent beats. Now, some equipment stocks' valuations based on the firm's strong 2027 earnings forecasts have approached cyclical trough levels, reflecting investors beginning to doubt whether the 2028 upcycle can continue. Morgan Stanley stated that this exhibition strengthened the credibility of supply chain expansion but did not provide sufficient new evidence to confirm 2028 earnings.

Combined with the current market environment, for the semiconductor equipment sector and the broader global semiconductor industry's significant rebound trajectory to continue, cloud service providers' investment returns and financing capabilities need to achieve new expansion pathways against a backdrop of sustained stability, further manifesting as customers receiving equipment on schedule and equipment makers realizing revenue and cash flow. These links determine how much of the strong demand can ultimately be converted into shareholder returns.

The More Expensive the AI Chip, the More Valuable the Yield: Inspection and Testing Equipment Competing for New Value

U.S.-headquartered semiconductor equipment giant Applied Materials is increasing investment in front-end optical wafer inspection and materials metrology and attempting to extend its e-beam advantages and new optical products into advanced packaging. Morgan Stanley acknowledges its logic for challenging KLA's front-end leadership position: Applied Materials' process control business grew over 50% this year, higher than the approximately 25% the firm estimates for KLA; however, this only brings the former slightly above its 2022 peak and still requires more sustained growth to prove share gains.

Morgan Stanley stated that disagreements within the industry regarding advanced packaging technology and market share direction are more significant: Onto believes Applied Materials may be overestimating the addressable market, while Nova emphasizes that metrology equipment costing millions of dollars per unit with limited customer deployment quantities must win orders through performance and total cost of ownership. KLA's advanced packaging revenue will not exceed $1 billion until 2026, and for Applied Materials to reach the same scale, it would need to capture significant share. Advanced packaging expansion brings opportunities, but throughput, sensitivity, and customer qualification capabilities of different inspection technologies determine how much revenue each player can capture.

Changes in the testing segment are more structural. The report cites Teradyne's "test shift-left" framework, which threads testing through wafer, post-dice bare die, interposer and substrate, post-dice device, final test, and system-level test, with the goal of detecting defects at the earliest economically viable stage. The underlying reason is that when compute dies, HBM, and advanced packaging capacity are all scarce, a single defective die entering expensive packaging can simultaneously waste multiple high-value resources and reduce deliverable products that cannot be quickly replenished.

Testing also handles parameter trimming, fuse programming, and product binning, directly affecting whether chips can be sold. Morgan Stanley estimates that testing spending as a proportion of WFE will rise from 5.8% during 2020-2024 to 8.5% in 2026, acknowledging its value increase while questioning how much more testing intensity can be raised.

The most investment-significant change for semiconductor equipment here is that testing has begun protecting the efficiency of converting scarce capacity into revenue. That is, testing equipment improves deliverable qualified chip output by screening out defects early and reducing waste of high-value components and scarce packaging capacity, thereby safeguarding revenue realization. By identifying defects earlier, it reduces waste of expensive chips and scarce packaging capacity, allowing limited production resources to ultimately yield more marketable qualified products. For example, screening out defective compute dies early can avoid the problem only being exposed after expensive packaging with qualified HBM is completed, which would cause losses across other components and packaging investments as well. When capacity is tight, such losses also mean fewer products delivered and less revenue recognized, making customers more willing to invest in effective testing.