Should Investors Care More About a Company's Customers or Its Suppliers?
September 14, 2026
Altsets
Research by Altsets Research
Customer relationships usually explain demand and revenue risk, while supplier relationships often explain continuity and cost risk, so the side that matters most depends on how the investment thesis can fail.
Data used:Altsets Supply Chain Intelligence: 90k+ entities, 400k+ relationships, 20+ years of history.
Key findings
- The supplied Tesla-LG Energy Solution relationship shows strong directional asymmetry: Tesla represents 19.03% of LG Energy Solution revenue while LG Energy Solution represents 3.41% of Tesla's cost base in the displayed data.
- Supplier importance can exceed financial spend when replacement is difficult, so the correct priority follows the thesis failure mode rather than a universal rule that customers or suppliers always matter more.
Neither customers nor suppliers always matter more. Prioritize the side whose failure can most directly break the investment thesis: customers through demand and revenue, or suppliers through cost, availability, and production continuity.
Customers usually matter through demand, revenue concentration, bargaining power, and the durability of sales. Suppliers usually matter through cost, availability, production continuity, qualification, and the ability to deliver the product at all. The right side to prioritize depends on what can break the thesis.
The same relationship can matter very differently to each company
LG Energy Solution and Tesla show why direction matters. The supplied Altsets relationship associates Tesla with 19.03% of LG Energy Solution revenue while LG Energy Solution is associated with 3.41% of Tesla's cost base.
Those percentages have different denominators, so they should not be compared as if they measured the same thing. They still reveal an important asymmetry: Tesla is a large customer dependency from LG Energy Solution's perspective, while LG Energy Solution represents a much smaller share of Tesla's total cost base in the displayed relationship data.
That means the same commercial relationship can deserve far more attention in one investment thesis than in the other.
Customer risk usually begins with demand
A major customer can influence revenue growth, order timing, pricing, product qualification, and the visibility of future demand. When one customer represents a meaningful share of supplier revenue, the investor should understand what could cause that customer's purchases to accelerate, slow, or move elsewhere.
LG Energy Solution publicly identifies itself as a Tesla ESS battery supplier, and the company says batteries for Tesla's Megapack 3 are planned to be produced at its Lansing facility beginning in 2027. That public context makes Tesla useful to monitor as a demand source rather than merely a customer label.
The customer side of the network is therefore especially important when the thesis depends on revenue growth or a specific product cycle.
Supplier risk usually begins with continuity
The upstream side can matter even when the financial percentage looks smaller. A low-cost component can halt production if it is technically difficult to replace, regulated, capacity constrained, or available from only one qualified source.
Micron's fiscal Q2 2026 filing makes that point explicitly. The company says some materials and services have only a limited number of capable suppliers, some inputs can be single or sole source, and certain key equipment categories can depend on a single supplier.
That means supplier importance cannot be ranked only by spend.
A growth thesis and a resilience thesis may prioritize opposite sides
An investor buying a supplier because of expanding AI demand may spend more time on customers. The important question is whether the supplier remains attached to the customers and products driving the growth story.
An investor worried about production resilience may spend more time upstream. The important question becomes whether the company can keep manufacturing if one supplier, facility, material, or equipment source is disrupted.
Both analyses can be correct for the same company because they are answering different investment questions.
Portfolio context can change the priority again
A company may have diversified customers and suppliers in isolation while the investor's portfolio repeats one outside node across several holdings. In that case, the most important dependency may come from portfolio overlap rather than the company's standalone concentration.
Three holdings sharing one customer can create a portfolio-level demand risk. Three holdings relying on one supplier can create a portfolio-level bottleneck. The investor needs to know which side is repeated across the account.
This is why customers versus suppliers is not only a company question.
Start with the failure mode
The fastest way to decide which side deserves more research is to ask what would have to happen for the thesis to fail. If the answer is "the customer stops buying," start downstream. If the answer is "the company cannot produce," start upstream.
If the answer is "several holdings react to the same outside event," start with the shared node regardless of whether it is a customer or supplier.
Supply-chain data becomes useful when it organizes the investigation around that failure mode.
The conclusion is not customers or suppliers
The answer is whichever side contains the dependency capable of changing the investment outcome.
Customers tend to explain demand and revenue risk. Suppliers tend to explain continuity and cost risk. Portfolio overlap can make either side more important than it appears from one company's financial statements. The investor should follow the side that connects most directly to the thesis being tested.
The customer-concentration guide explains why customer exposure and end-market diversification can diverge. The financial versus operational criticality guide explains why supplier importance can exceed its apparent financial weight.
For relationship definitions and evidence limits, read the Altsets methodology.