The $645 Billion Semiconductor Reshoring Wave Has a Blind Spot

Over $645 billion in US semiconductor supply chain investments have been announced since the passage of the CHIPS and Science Act in 2022. The scale is extraordinary. But the allocation of that capital reveals a structural imbalance that most investors have not yet recognized — and within that imbalance lies one of the most compelling long-term investment opportunities in the technology sector.

Where the Money Is Actually Going

The announced semiconductor investments break down roughly as follows: approximately $450 billion is directed at fab construction — the front-end manufacturing facilities that produce silicon wafers. Advanced packaging receives approximately $85 billion. Specialty chemicals and materials receive approximately $45 billion. Equipment and tools receive approximately $35 billion.

The pattern is clear: the overwhelming majority of reshoring investment is focused on the front end of the semiconductor supply chain. The back end — the assembly, packaging, testing, and inspection infrastructure that converts wafers into functional, shippable chips — has received a fraction of the attention and capital.

This is the blind spot.

What the Back End Actually Does

The semiconductor value chain can be divided into two broad phases. The front end encompasses wafer fabrication — the deposition, lithography, etching, and doping processes that create transistors on silicon. The back end encompasses everything that happens after the wafer leaves the fab: wafer dicing, die packaging, interconnect formation, testing, and final assembly.

A chip fabricated in a new TSMC facility in Arizona or an Intel fab in Ohio still needs to be packaged and tested before it can be used in a product. And that packaging and testing capacity is overwhelmingly located in Asia — primarily Taiwan, South Korea, Malaysia, and China.

The United States is investing hundreds of billions of dollars to build front-end fab capacity domestically. But if the back-end infrastructure does not exist to package and test the chips those fabs produce, the reshoring objective is only half-achieved.

Advanced Packaging: The Single Tightest Bottleneck

The most acute constraint in the current AI-driven semiconductor cycle is not wafer fabrication capacity — it is advanced packaging. Technologies such as CoWoS (Chip-on-Wafer-on-Substrate), HBM (High Bandwidth Memory) stacking, and 2.5D/3D integration place multiple dies in close proximity, dramatically increasing bandwidth and reducing latency. Every AI accelerator of consequence — NVIDIA's H100 and H200 GPUs, AMD's MI300X — requires advanced packaging.

CoWoS capacity became the single tightest supply bottleneck in 2023 to 2025. TSMC, the dominant provider, was unable to meet demand despite doubling capacity in 2024 and committing approximately $3 billion to further CoWoS expansion. The global advanced packaging market was valued at $33.5 billion in 2025 and is projected to reach $94.33 billion by 2034, growing at a CAGR of approximately 11% — more than twice the rate of the broader semiconductor market.

The OSAT Market and the Reshoring Opportunity

The outsourced semiconductor assembly and test (OSAT) market — which encompasses the full range of back-end services including packaging, burn-in, and final test — was valued at $46.5 billion in 2025 and is projected to reach $88.9 billion by 2031 at a CAGR of 11.5%.

The back-end reshoring gap is beginning to be addressed. SK Hynix has announced an advanced packaging investment at Purdue Research Park in Indiana. Amkor Technology has received $400 million in CHIPS Act incentives for its new advanced packaging facility in Peoria, Arizona — the first advanced packaging facility of its kind in the United States. Intel's packaging operations in Arizona are expanding.

But the scale of back-end investment remains a fraction of front-end investment, and the lead time to build and qualify new packaging capacity is measured in years, not months. The qualification process for new packaging facilities — validating that the facility can produce chips that meet the precise specifications required by chip designers — can take 12 to 24 months after construction is complete.

The Competitive Moat of the Back End

One of the most important and underappreciated characteristics of the semiconductor back-end supply chain is the qualification-based competitive moat. Once a supplier's materials, equipment, or services are qualified for use in a production process, switching costs are extremely high. The risk of introducing yield loss or contamination by changing a qualified supplier is simply too great for most chipmakers to accept without compelling reason.

This creates a structural advantage for established back-end suppliers: they are effectively insulated from competition by the qualification process itself. New entrants must invest years and substantial capital before they can compete for production contracts, and even then, they face the challenge of displacing incumbents who have built deep customer relationships and process knowledge over decades.

For investors, this means that the companies currently positioned in back-end semiconductor infrastructure — packaging, test, inspection, specialty materials, and process equipment — have durable competitive advantages that are difficult to replicate and that will compound over the multi-year reshoring buildout.

The Portfolio Implication

The Walmer Family Fund's Semiconductor Downstream Supply Chain report identifies ten US-listed public companies across four downstream segments — OSAT and advanced packaging, process equipment, specialty materials, and test and inspection — as the most compelling long-term investment opportunities in the semiconductor reshoring wave.

The report profiles Amkor Technology, Applied Materials, Lam Research, KLA Corporation, Entegris, MKS Instruments, FormFactor, Kulicke and Soffa, Onto Innovation, and Cohu, with live financial metrics, investment theses, and a portfolio construction framework. The full 25-page report is available free of charge at walmerportal.com.