A Shared Customer Does Not Make Two Suppliers Substitutes
Published August 23, 2026
Altsets
Research by Altsets Research
Use the supply chain graph to find candidate alternatives, then filter by product function, qualification, capacity, geography, and existing customer relationships.
Dataset reference:Altsets supply chain relationships dataset covers 115k+ entities, 550k+ relationships, and history since 2006 across the full dataset; individual analyses use a narrower scope.
Key findings
- A shared customer does not establish functional substitutability because suppliers connected to the same manufacturer can perform very different technical roles.
- Relationship size and existing customer connections can prioritize replacement candidates only after a valid product or process substitute set is defined.
A supplier substitution screen should first establish that a candidate can perform the disrupted function, then ask whether the customer can actually use it. Micron's mapped suppliers illustrate why reversing that order produces false alternatives. Five existing relationships provide evidence of commercial access and scale; none, by itself, establishes replacement capacity for another supplier's product.
The useful output is an admission decision for each candidate: functionally relevant, technically qualified, available within the required window, or still unresolved. Relationship Size and Customer Cost % help prioritize research after that decision. They cannot make an unrelated input interchangeable with the missing one.
Five commercial connections, several manufacturing functions
The displayed Altsets relationships are:
| Supplier to Micron | Relationship Size in the supplied view | Customer Cost % | Public product categories relevant to screening |
|---|---|---|---|
| ASML | $3 billion | 11.91% | Lithography systems; metrology and inspection |
| Lam Research | $1.2 billion | 5.52% | Deposition, etch, strip and clean |
| Applied Materials | $990 million | 3.84% | Materials engineering and semiconductor manufacturing equipment |
| KLA | $693 million | 2.84% | Inspection, metrology and process control |
| Shin-Etsu Chemical | JPY 59.1 billion in the broader network view | 1.34% | Silicon wafers and photoresists |
Product categories come from the companies' public materials: ASML, Lam Research, Applied Materials, KLA and Shin-Etsu. They describe supplier portfolios, not the exact products represented by each Micron edge. That distinction matters especially where portfolios overlap, such as inspection or metrology. A broad category match is a reason to investigate a particular tool, not a completed substitution test.
Consider a hypothetical interruption to a lithography system. Lam, Applied Materials and KLA together have $2.883 billion in displayed Micron relationships, calculated as $1.2 billion + $990 million + $693 million. That is 96.1% of the $3 billion ASML relationship. It would be a serious modeling error to interpret the near match as nearly enough replacement supply. These dollars describe commercial relationships spanning different functions. They measure neither equivalent lithography output nor unused tool capacity. The JPY Shin-Etsu amount is excluded from that dollar sum rather than silently converted.
Admit candidates against a specific input
Write the requirement narrowly enough to reject a false match: the affected process step, tool or material specification, relevant facility and date by which supply is needed. Establish which product sits behind the affected relationship, then test alternatives against that requirement.
| Admission gate | Evidence that advances a candidate | Decision if evidence is absent |
|---|---|---|
| Same function | Product documentation matching the affected process and specification | Keep outside the substitute set |
| Customer compatibility | Customer-specific qualification or an applicable approved configuration | Retain as a technical candidate, not a qualified replacement |
| Timely availability | Deliverable capacity, inventory or installation schedule within the disruption window | Do not count as available mitigation |
| Economic feasibility | Comparable delivered cost, conversion expense and expected operating performance | Keep the recovery scenario unpriced |
An existing Micron relationship can help prioritize a candidate that passes the first gate. It establishes a commercial connection worth investigating, while qualification remains specific to the input and facility. Even a supplier already serving one Micron process cannot be presumed qualified for another. Conversely, an alternative absent from this five-edge view should not be rejected solely for lacking a displayed relationship; the technical search may extend beyond the graph.
Rank the admitted set, then build the recovery case
Once the candidate set is functionally valid, relationship metrics can distinguish established commercial scale from a small or unquantified connection. Preserve the original currency and observation period when comparing dollars. Use Customer Cost % to describe financial exposure to the affected supplier, rather than treating it as the fraction of production that another supplier must replace.
A recovery model needs an explicit quantity and timetable: how much affected output a qualified alternative could restore, when it becomes available, and at what incremental cost. None of those inputs follows from the relationship-dollar sum. If capacity is unresolved, retain an unresolved recovery case instead of assuming that the customer's remaining suppliers absorb the shortfall.
The five-edge screen therefore reaches a bounded but useful result: Micron has several substantial upstream commercial relationships, but this evidence does not establish a qualified substitute for the hypothetical lithography interruption. The next research task is product-specific qualification and availability, not reallocating $3 billion across adjacent nodes. Metric definitions are in the Altsets methodology.
Sources
Related research
Methodology
Cite this research
Altsets Research. "A Shared Customer Does Not Make Two Suppliers Substitutes." Published August 23, 2026. https://www.altsets.com/research/replacement-supplier-screening