Market cap equals price times shares
Market capitalization, or market cap, is a company's value found by a single multiplication. Take the market price of one share, then multiply by the total outstanding shares.[S1]
Market cap moves whenever the price or the share count changes. It is not cash the company holds, and a price is always tied to a date.
Every figure below shows the date of the price it uses. The list is A–Z, not a ranking.
See it in real companies
Market cap at companies on Cityfort
5 companies on Cityfort, listed A–Z (not ranked).
From each company's filings, as cited on its Cityfort stock page. These figures change when a stock page is updated. Price-based figures use the price on the date shown and may be out of date.
Each stock page shows the price and share count behind its figure.
Amazon's are in its market context section. Its Nasdaq closing price: $240.35 (price as of Oct 30, 2026).[S6]
Its share count: 10,786.3 million (on Jul 22, 2026). Price times shares gives its market cap at that Nasdaq close: $2.60T (price as of Oct 30, 2026).[S6]
P/E equals price divided by earnings
The price-earnings ratio, or P/E, divides the stock price by earnings per share.[S2] Earnings per share is the past 12 months' earnings divided by the common shares outstanding.[S2]
The SEC's guide gives an example: a $20 stock earning $2 per share sells at 10 times earnings.[S3] In words, the P/E is the number of dollars of price for each $1 of earnings over the past year.
A company with a net loss has negative earnings, so the division has no plain meaning. At SpaceX, the four quarters to Sep 30, 2026 added up to a net loss. Its stock page showed no P/E for that period.
See it in real companies
P/E ratio at companies on Cityfort
4 companies on Cityfort, listed A–Z (not ranked).
From each company's filings, as cited on its Cityfort stock page. These figures change when a stock page is updated. Price-based figures use the price on the date shown and may be out of date.
Why can gains outside the main business move a P/E?
Earnings are the bottom of the P/E fraction. Anything that lifts earnings moves the ratio, even if it has nothing to do with selling to customers.
Amazon's filings show gains of this kind. Its FY2025 10-K says that year's net gain in other income was primarily tied to its investments in Anthropic.[S5]
Its Q2 2026 earnings release is dated Jul 30, 2026. It says net income that quarter included non-operating pre-tax other income, "primarily from our investments in Anthropic".[S4]
The release gives the amount.[S4] The risks section of Amazon's stock page covers how these gains affect net income.
Gains appeared in both periods. They sit in net income, and they are not operating income.[S4][S5]
Amazon's P/E on Cityfort, using the Nasdaq closing price on the date shown, is 19.4× (price as of Oct 30, 2026).[S6]
The market context section shows the earnings per share behind it, and the 12 months they cover.
The Amazon stock page notes that those earnings include the gains.
What does P/E not tell you?
P/E is one division, so it leaves out everything that is not in the fraction:
- It looks back. Its earnings are from the past 12 months, not any later period.[S2]
- It says nothing about debt. Two companies with the same P/E can owe very different amounts.
- It does not show cash. Earnings and cash differ, as revenue, profit and cash flow explains.
- It does not explain itself. It does not say why the price or earnings are what they are.
- It depends on the share count. Diluted earnings per share can count more shares than basic. See stock-based pay and dilution.
Cityfort explains how a P/E is built. It does not label any P/E as high or low, and it does not say what a share is worth.