The MarketCapLens ranking lists companies by market capitalization, largest first. Here is exactly how that list comes together, so you know what you are looking at.
Key takeaways
The ranking covers U.S.-listed companies, those trading on major American exchanges such as the NYSE and NASDAQ, above a minimum market-cap threshold. The floor keeps the list focused on companies above a size threshold rather than the long tail of tiny listings. The threshold in effect appears on the homepage next to the company count.
We focus on common equity. ETFs, funds, preferred shares, equity units, warrants, and exchange-traded notes (including junior subordinated “baby bonds”) are left out so the list stays a ranking of operating companies, not every tradable ticker. A notes ticker is not treated as an alias of the issuer’s common shares.
U.S.-listed includes ADRs. SK hynix and Toyota are Korean and Japanese companies whose shares trade in the U.S.; they appear because they clear the exchange and size tests, not because we rank every listing worldwide. A name that is not U.S.-listed (Samsung is the usual Memory-hub question) is not in this ranking.
Ranking market cap is the provider-reported capitalization on the snapshot, in U.S. dollars.
That figure is what Financial Modeling Prep reports for the listing on the company screener. In principle it is share price × shares outstanding, but this site does not recompute ranking cap as live price times a share count we invent. Company pages also show a separate historical market-cap series from a different FMP endpoint; those points can disagree with the headline when timestamps or share-count definitions differ.
One detail matters here. Many companies have more than one class of shares, sometimes under separate tickers. Where that happens, the classes are combined so the company is counted once, at its full size, rather than split into two smaller entries. That keeps the ranking a list of companies, not a list of tickers. Alphabet (GOOGL and GOOG) is the worked example; see dual-class shares and market cap.
Prices, share counts, and fundamentals come from Financial Modeling Prep (opens in a new tab).
Ranking market cap is the company-screener snapshot figure. The homepage, the sector pages, and the ranking number on each company page all use that same snapshot, so those ranking figures agree with one another.
Historical market cap on company pages comes from a separate FMP endpoint, historical-market-capitalization. That series is date-stamped and can disagree with the ranking snapshot even when both display as the same calendar day. Ranking as-of is a snapshot timestamp shown as a date; the historical point is a date-only observation. This site reports both and does not replace one series with the other.
Two dated examples from 22 September 2026: Compass Pathways (CMPS) showed ranking cap about $1.99 billion and a historical point about $1.38 billion. NuScale Power (SMR) showed ranking about $2.65 billion and historical about $3.24 billion. Both pairs use the same listed ticker, a single share class in this ranking, and are not mapped onto each other.
The underlying data refreshes multiple times every trading day, and the ranking is rebuilt from the latest snapshot. Each page shows an "as of" date so you always know how current the figures are. Prices can be delayed by anywhere from a few minutes to a few hours, so treat the ranking as a research and comparison tool rather than a live trading feed.
It is a consistent, transparent way to compare companies by size and to browse the market by sector or curated groups like the Magnificent 7. It is not a buy-or-sell list. Size says nothing about whether a company is a good investment; see the size tiers for what large versus small tends to imply, and what a sector is for industry groupings — and nothing more.
For general education only. Nothing here is investment advice.
Formulas and worked examples are MarketCapLens's. See who checks the numbers.