How to Find Public Stocks Exposed to Private Companies
September 2, 2026
Altsets
Research by Altsets Research
Use verified customer and supplier relationships to identify public companies with operating exposure to private businesses without pretending the public stock is a substitute for owning the private company.
Data used:Altsets Supply Chain Intelligence: 90k+ entities, 400k+ relationships, 20+ years of history.
Key findings
- Tesla disclosed 405M USD of first-half 2026 revenue from SpaceX purchases of Megapack products, creating a directly observable public-company operating exposure to a private customer.
- Tesla also holds a separate SpaceX equity investment, demonstrating why operating exposure and ownership exposure should be analyzed independently when screening public proxies for private companies.
To find public stocks exposed to a private company, start with the private entity, map its public suppliers and customers, and verify the commercial function and materiality of each relationship. This identifies investable exposure paths without pretending the public stock is equivalent to owning the private company.
Tesla and SpaceX provide a clean example. The supplied Altsets graph contains a structural relationship from Tesla to SpaceX. Tesla's June 2026 filing then confirms that SpaceX purchased Tesla Megapack products. That creates a public-company exposure path to a private-company customer.
The relationship is commercially observable
Tesla disclosed 405M USD of revenue from SpaceX during the first six months of 2026 for Megapack purchases. Tesla also disclosed 307M USD of cost of revenues associated with those sales. Those are filing figures, not Altsets relationship-size estimates.
The graph identifies the relationship. The filing confirms a current product and accounting effect. That is enough to treat Tesla as a public company with directly observable commercial exposure to SpaceX demand.
This is not the same as owning SpaceX
A public supplier is not a substitute for owning the private customer. Tesla's share price depends on many businesses unrelated to SpaceX. SpaceX purchases are only one component of Tesla's overall operations.
A supplier can benefit from private-company growth while its stock is driven by completely different factors. The correct framing is economic exposure, not synthetic ownership.
The exposure can be operational rather than financial
Investors often search for "stocks exposed to SpaceX" and end up with companies that own a financial stake. A supply-chain graph can surface a different category: suppliers, customers, service providers, infrastructure vendors, logistics companies, and manufacturers. These companies can have operating exposure even if they own no equity in the private company. That is a different investment thesis.
Tesla actually has both kinds of exposure
Tesla disclosed that it invested 2B USD in SpaceX common stock in March 2026 and held less than 1%. So Tesla currently has both: commercial exposure through Megapack sales and investment exposure through its SpaceX equity stake. Those channels should remain separate.
The commercial relationship can affect Tesla revenue and gross profit. The equity investment can affect investment value and accounting. One does not measure the other.
Supply-chain data can expand the candidate universe
The same workflow can be used for other private companies. Start with the private company and search outward for public suppliers, public customers, infrastructure providers, contract manufacturers, and major service providers. Then verify each candidate with public disclosures.
A relationship graph is especially useful because private companies do not always provide detailed supplier lists themselves. The public counterparty may disclose the relationship instead.
The relationship still needs materiality work
A confirmed commercial relationship can be too small to matter to the public company's stock. The investor therefore needs to ask:
- What share of supplier revenue is associated with the private customer?
- Is the relationship growing?
- Is the product high margin?
- Is the customer concentrated?
- Is the supplier capacity constrained?
- Is the relationship recurring?
- Does the public supplier have many larger businesses?
The graph creates the candidate. Materiality analysis decides whether the candidate belongs in the investment thesis.
Avoid weak "proxy stock" logic
A bad private-company proxy screen says: "Company X works with SpaceX, therefore Company X is a SpaceX stock." A stronger screen says:
"Company X has a verified commercial relationship with SpaceX. Here is the revenue, product, duration, and materiality we can actually observe."
That difference matters for SEO research too. The second answer provides information a generic list of related companies cannot.
A repeatable private-company exposure workflow
- Start with the private company.
- Map public counterparties.
- Verify the commercial relationship.
- Identify the product or service.
- Separate operating exposure from equity ownership.
- Measure public-company materiality.
- Check whether the relationship is recurring.
- Track changes over time.
- Avoid describing the public company as a substitute for the private stock.
- Build a basket only when each member has independently verified economic exposure.
The Tesla and SpaceX exposure article separates Tesla's commercial and investment channels in detail. This guide generalizes the investing use case: finding public companies with real economic links to businesses that are not directly investable. For relationship methodology, read the Altsets supply-chain data methodology.