Elon Musk investments: companies, deals and lessons

Brian Nichols is the co-founder of Angel Squad, an angel investing community where aspiring and active angels learn from Hustle Fund’s approach, review curated deal flow, and connect with peers.

Elon Musk’s name appears beside automakers, rockets, payment companies and artificial intelligence labs. Those connections can mean very different things for an investor. Founding a company, buying another business and writing an early startup check each create a different relationship.

Understanding those differences helps you make sense of his investments and decide which lessons belong in your own angel investing approach.

The main companies tied to Elon Musk’s investments

The clearest starting point is Musk’s role in each business. Several familiar names are now parts of larger companies, so counting every brand as a separate investment can give you the wrong picture.

Tesla: an early investment followed by an operating role

Musk led Tesla’s Series A financing, an early round of startup funding, in 2004. He invested $6.5 million and became chairman. He became CEO in October 2008, according to the historical record in Tesla’s proxy filing.

Tesla makes electric vehicles, batteries and energy products. Musk’s relationship combines share ownership with responsibility for running the company. An outside shareholder has a very different level of control.

SpaceX: a founder-led company that is now public

Musk founded SpaceX in 2002. Its businesses include rocket launches, Starlink satellite connectivity and, following its acquisition of xAI, artificial intelligence.

SpaceX completed its initial public offering, the first sale of its shares to public-market investors, in June 2026. Its Class A shares began Nasdaq trading on June 12, 2026, under SPCX, according to its earnings release. Starlink is a business within SpaceX, rather than a separately listed stock.

X and xAI: acquisitions changed the ownership map

Musk acquired Twitter in October 2022; the platform later became X. He founded xAI in 2023, which develops the Grok artificial intelligence system.

The companies then combined. xAI acquired X in March 2025, and SpaceX acquired xAI in February 2026. SpaceX’s financial disclosures describe that sequence and identify space, connectivity and artificial intelligence as its three operating segments.

X and xAI now sit within the SpaceX ownership map, with their results contributing to the combined business.

Neuralink and The Boring Company: private founder-backed businesses

Musk co-founded Neuralink, which develops brain-computer interfaces, technology that links brain activity with external devices. He also founded The Boring Company, which develops tunneling equipment and underground transport systems.

Both remain private companies. Their private-securities fundraising is documented in Neuralink’s offering notice and The Boring Company’s notice. Neither has an ordinary publicly traded stock ticker.

They also have distinct products and legal entities; a connection to Musk doesn’t make them subsidiaries of Tesla. Private or indirect investment routes have their own access conditions, terms and restrictions.

SolarCity, Zip2 and PayPal: historical interests

Musk backed SolarCity and served as its chairman. Tesla acquired it in November 2016, and his SolarCity shares were converted into Tesla shares under the merger’s terms. SolarCity is no longer a separate publicly traded investment.

Earlier, Musk co-founded Zip2, which Compaq acquired in 1999. He then founded X.com, the online financial services business that became part of PayPal. eBay acquired PayPal in 2002.

Those exits belong to his entrepreneurial history. Buying PayPal shares today doesn’t recreate Musk’s early investment or its economics.

Startups Musk backed without building them himself

Musk has also invested in companies run by other founders. These investments are closer to the angel investing model: an individual provides capital while another team operates the business.

Reported examples include:

• Stripe: TechCrunch’s 2011 report named Musk among investors but noted that Stripe would not confirm the financing.
• DeepMind and Vicarious: Musk discussed his investments in both artificial intelligence companies in a 2014 interview. Google had already acquired DeepMind that year.
• NeuroVigil: The brain-monitoring technology company named Musk among its investors in a 2015 funding announcement covered by NASA’s research newsletter.

These are historical investments, rather than a verified inventory of everything Musk owns today. A funding round’s total size also doesn’t reveal his personal check size, purchase price or eventual return.

OpenAI needs a separate label. Its 2015 founding announcement named Musk as a co-chair and donor to the nonprofit research organization. A charitable contribution to a nonprofit doesn’t establish an equity stake in a later commercial business.

That distinction matters whenever a famous investor’s name appears on a company page. “Founder,” “donor,” “advisor” and “shareholder” describe different relationships.

Where vertical integration fits

Vertical integration means bringing more stages of a product’s supply chain inside one company. A manufacturer might make a component it previously bought, or own the distribution channel through which it reaches customers.

SpaceX’s rocket launches and Starlink satellite network illustrate the logic. Launch capability supports deployment of the network. The company has more control over a dependency that another satellite operator might buy from an outside supplier.

The X, xAI and SpaceX transactions show a different kind of combination: businesses with different products brought under common ownership. That may create opportunities to share infrastructure or distribution, but common ownership alone doesn’t prove that those opportunities will produce better financial results.

Tesla remains a separate public company, even though it has commercial and investment relationships with SpaceX. Tesla reported $430 million in Megapack battery sales to xAI during 2025 in its annual financial filing.

Tesla also agreed to invest in xAI in January 2026. After SpaceX acquired xAI, that transaction became an investment in SpaceX Class A common shares.

Tesla completed the investment of approximately $2 billion in SpaceX Class A common shares on March 12, 2026. Its second-quarter filing reported an ownership interest of less than 1%.

That was Tesla investing corporate capital. It belongs in a different category from Musk writing a personal angel check.

A customer under common ownership can provide early demand while leaving the supplier exposed if that customer cuts spending. Shared infrastructure can lower costs while spreading an operational failure across several businesses.

What angel investors can use from this approach

Musk’s record offers examples of ambitious technical bets and close involvement in company building. Your own investment process still needs to match your capital, access and ability to help.

Most angels hold minority stakes, meaning they own part of a company without controlling it. You can’t assume you’ll be able to redirect its strategy, supply its next funding round or arrange a merger.

Build a portfolio around a thesis, with different failure paths

A thesis is a clear belief about where valuable companies could emerge. For example, an experienced hospital operator might believe that better billing software can reduce administrative work. That expertise gives the investor useful questions to ask founders.

It doesn’t remove concentration risk, the risk of depending too heavily on one investment or shared outcome. In a hypothetical portfolio, three hospital software startups might all sell to the same health systems. A freeze in those customers’ budgets could hurt all three at once, even if the products solve different problems.

Our general partner Elizabeth Yin writes in Democratizing Knowledge (Hustle Fund, 2021), “Don't try to pick a co. Select a portfolio.” The point is to evaluate how your investments fit together, alongside the merits of each company.

Our approach to spreading your bets makes room for uncertainty. Different customers, funding needs and routes to market can reduce dependence on a single outcome. Diversification still can’t prevent losses, and most startup investments may fail.

Require evidence for the connection between businesses

“These companies could work together” is an investment hypothesis. Evidence makes it useful.

For a startup whose pitch depends on an ecosystem of partners, customers or affiliated companies, examine three things:

1. Independent demand: Paying customers outside the founder’s network provide evidence that the product solves a broader problem. Revenue from an affiliated customer deserves its own scrutiny.
2. The economic benefit: A connection should have a specific effect, such as lower delivery costs, faster installation or access to customers. A shared founder or fashionable technology is a weak substitute.
3. The dependency: Identify what happens if the partner stops buying, raises prices or becomes unavailable. A startup needs a credible response to that failure.

Imagine a battery company whose first customer is another business owned by its founder. That contract could help the team learn and scale. Stronger evidence would include unrelated customers buying at sustainable prices and a product that remains useful without the original customer.

The lesson is to separate a useful operating relationship from an assumption that related businesses will support each other indefinitely.

Judge each deal with a repeatable process

A recognizable founder can draw your attention. Your investment decision still needs a view on the team, market, traction and deal terms.

A startup evaluation framework we've shared from investor Sandy Naidu uses five lenses: team, target market, technology, traction and terms. The target market is the group of customers the company can serve, and traction is evidence of customer adoption. Terms determine what you pay and what rights your investment carries.

Use the same lenses across deals. Record the evidence behind your decision, the assumptions that could break it and what progress would change your view.

In the same 2021 book, Elizabeth Yin explains, “The more disciplined you are in your thought process/rubric, the more you can improve over time.” A consistent rubric, a set of evaluation criteria, helps you learn from decisions without confusing one lucky outcome with a reliable process.

In Angel Squad, you can learn from our investing approach and discuss deals with other angels. Comparing the reasoning behind a decision helps you see risks and assumptions you might miss alone.

Can you invest in Elon Musk’s companies?

Tesla stock trades under TSLA, and SpaceX Class A shares trade under SPCX. Buying either stock gives you ownership in that issuer, the company whose shares you bought, subject to its share class and rights. It doesn’t give you a direct personal stake in every company associated with Musk.

SpaceX’s ownership of xAI and X means those businesses contribute to the combined company’s risks and results. Tesla’s investment in SpaceX creates another connection, but Tesla shares remain shares in Tesla.

Private companies such as Neuralink and The Boring Company require a different analysis. Access to a private offering depends on its terms and securities rules. Any fund or special purpose vehicle, an entity formed to hold an investment, also adds its own ownership structure, fees and restrictions.

Private startup investments are speculative, generally illiquid and long-term. You may be unable to sell when you want to, and you can lose your entire investment. A famous founder doesn’t change those risks.

If you want to build your own startup evaluation process with experienced investors and peers, apply to Angel Squad.

This content is for education and does not constitute investment, legal or tax advice. Seek independent advice from qualified investment, legal and tax professionals for your circumstances.