A company is worth $10 trillion

Where things stand (as of 9 Oct 2026 close)

• Nvidia is the largest company, at about $5.54T. It closed at $229.28 with 24.147B shares outstanding (Yahoo Finance quote and chart API, query1/query2.finance.yahoo.com). Its peak close was about $5.77T on 5–6 Oct. To reach $10T it needs about $414 a share, roughly +81%. No company has ever closed above about $5.8T.
• Next largest (companiesmarketcap.com, 9 Oct): Apple $4.91T (needs 2.04x), Alphabet $4.30T (2.33x), Microsoft $3.97T (2.52x), Amazon $2.83T, TSMC $2.35T, SpaceX $2.14T (listed at $1.77T), Meta $1.83T.
• New entrants: Anthropic plans a listing before Thanksgiving at about $1.8–2T (Bloomberg via Quartz, 1–2 Oct). OpenAI has delayed its listing to 2027 (CNN, 5 Oct).
• Nvidia's fundamentals: fiscal Q2 2027 revenue was $96.2B, up 106%. It guided $108B for Q3 and about 70% growth for fiscal 2028 (Fortune, 26 Aug). Consensus fiscal 2028 earnings per share is $15.70 and has risen 23.5% in 90 days (24/7 Wall St., 9 Oct). That puts the stock at about 15x next year's earnings. So $10T needs only about 26x fiscal 2028 earnings, but the low multiple shows the market doubts the boom will last.
• Macro risks: the 10-year Treasury yield is at 5.3–5.35%, the highest since 2002 (CNBC, 5 Oct). The Fed is hiking (CNBC, 7 Oct). Oil is above $100 because of the Iran war, market breadth is narrow, and there are mega-listings. AI stocks fell on 8 Oct after OpenAI revised its revenue figure (Baystreet, 9 Oct).

Evidence and base rates

1. Options prices (computed from Yahoo chains for $414 strikes). These are risk-neutral odds that Nvidia ever touches $414, using the implied volatility at that strike and the reflection approximation:

   • about 2.7% by March 2027
   • about 6% by June 2027
   • 7–11% by September 2027
   • 13.5–15% by December 2027
   • about 24% by June 2028
   • about 28–30% by December 2028

   Adjusting to real-world odds (adding an equity risk premium) pushes these slightly higher.

2. Metaculus community forecast ("When will Nvidia's market cap exceed $10T?"): median February 2032 (Verity newsletter, 4 Oct 2026), lower quartile about December 2028. That implies roughly 25% for Nvidia by end-2028 and about 48% by end-2031.

3. My Monte Carlo model (12 correlated candidates, daily closes, 20,000 paths; volatilities from realised and implied data; Anthropic and OpenAI enter on probable listing dates):

   Case	Any company by end-2031	Nvidia alone	Any by end-2027	Any by end-2028
   Base	71%	53%	–	–
   Conservative	63%	48.5%	16%	33%
   Conservative, 10% lower volatility	59.5%	–	–	–

4. Historical base rate. I used rough year-end figures from memory for the world's largest company, 1990–2021 starting years. The largest value grew at least 1.8x within five years in about 56–69% of windows. The failures cluster after bubble peaks: 1998–2001, 2006–08 and 2012.

5. Prediction markets. Manifold (play money) has 74% for Nvidia above $10T before 2030, and 46% for any US company worth $10T in 2022 dollars by end-2030. I gave these little weight.

Judgment

Nvidia is the main route to YES, at about 48% by 2031, consistent with Metaculus and the conservative model. I think the model overstates the extra contribution from mature, already highly valued companies like Apple and Microsoft. But there is real additional chance from Alphabet, Anthropic, OpenAI or SpaceX if the value of AI shifts away from chips. I add about 8–9 points for these.

The chance of first crossing is highest in 2027–28, when fiscal 2028 earnings arrive and either confirm the boom or show its peak. It then declines but stays meaningful as other contenders mature.

Q4 2026 is near zero, because Nvidia would need +81% in 11 weeks.

Publication adds no real friction: Reuters or Bloomberg would report such a milestone immediately, and exchange closing prices plus SEC share counts would establish it.

Strongest case against

This looks like a late-stage bubble: rising yields and Fed hikes (as in 1999–2000), $2T listings, and concentrated, circular AI financing. After the 2000 and 1989 peaks, the leaders took a decade or more to double. A 2027 AI-capital-spending bust would probably push $10T beyond 2031. The strongest case for higher odds is explosive AI revenue: Anthropic's run-rate went from $4.6B in 2025 revenue to about $100B, so several companies could cross $10T. I weigh these about equally, which puts me slightly below the plain model output.

Result: about 14% by end-2027, 30% by end-2028, 41% by end-2029, 49% by end-2030 and 56% by end-2031.

Question. By the last day of each quarter, has any company closed a trading day with a market capitalisation of US$10 trillion or more?

Definitions.

• Company: any publicly traded company worldwide, regardless of domicile, industry, or developer status. A listed holding company counts; a fund, ETF, index, cryptocurrency, or aggregate of separate companies does not.
• Market capitalisation: the total value of the company's outstanding ordinary/common equity, using official regular-session closing share prices and the shares outstanding applicable to that trading day. Count all outstanding shares, not just the free float; exclude treasury shares, preferred shares, debt, options, and unissued shares. For multiple equity classes, sum the class values, valuing unlisted economically equivalent classes at the listed equivalent's price. Do not double-count cross-listings or depositary receipts and their underlying shares.
• Close of a trading day: the official regular-session close on the security's primary listing exchange, including a closing auction. For separately traded classes, use their respective primary-exchange closes for that trading date. Intraday, pre-market, and after-hours prices do not count.
• US$10 trillion: US$10,000,000,000,000 in nominal dollars, without inflation adjustment. For non-dollar listings, use the same-day USD conversion used by the qualifying financial-news source; if calculating from primary records, use Bloomberg's closing spot exchange rate for that date.

Resolves YES if a qualifying source explicitly reports that a company's market capitalisation at a specified trading-day close was at least US$10 trillion, or publishes closing-price and shares-outstanding data establishing that result under the definitions above. An explicit statement that the company closed at or above the threshold counts; a rounded figure of “$10 trillion” without an explicit threshold statement or sufficiently precise underlying data does not.

The trading day must end after the opening date, under the Observation period convention, and the confirming publication must fall within the Resolution window and be published by the relevant quarter-end. No duration beyond one qualifying close is required. No attribution to AI is required.

Resolves NO if no qualifying confirmation has been published by the quarter-end. Private funding-round valuations, enterprise values, acquisition offers, projected valuations, and intraday threshold crossings without a qualifying close are excluded. A subsequent share-price decline does not reverse a YES.

Resolving source. Bloomberg, Reuters, or The Wall Street Journal reporting a specified closing valuation, or the primary listing exchange's official closing-price record combined with the company's regulatory filings or official share-count disclosures. These are the designated resolving sources rather than the developer-focused Public confirmation convention A2. In a material conflict, official exchange prices and company regulatory share counts take priority; among news reports, use Reuters, then Bloomberg, then The Wall Street Journal. Use explicit corrections available at adjudication, not superseded errors. Apply the Resolution date convention A3 to the publication establishing the qualifying close, not the trading date; for a calculation requiring multiple publications, use the latest necessary publication date. The Resolution window and once-YES rule apply.