Market Capitalization

The arithmetic is simple, but the share count is not. Issued shares are all shares a company has ever sold; outstanding shares are issued shares less those repurchased and held in treasury. Market capitalization uses shares outstanding, since treasury stock carries no claim on earnings and no vote. Free float goes one step further, excluding blocks held by founders, governments, cross-holding corporates and other strategic holders unlikely to trade.

Because the count moves, so does the measure. Buybacks retire shares and reduce capitalization even if price rises; secondary offerings, convertible conversions and employee option exercises increase it. Firms with multiple share classes require aggregating each class at its own price, which matters where a founder class trades thinly or not at all. Candidates should read "shares outstanding" from the balance sheet cover page or the equity note rather than assuming a single figure applies across periods.

Market capitalization prices one claim on the firm: residual common equity. The capital structure contains others. Enterprise value adds the market value of debt, preferred stock and non-controlling interests to the common equity value, then subtracts cash and short-term investments, since an acquirer effectively recovers that cash. The result approximates the value of the operating business independent of how it is financed.

This distinction drives multiple selection. Price-to-earnings and price-to-book are equity multiples and pair naturally with market capitalization. EV/EBITDA and EV/sales are enterprise multiples, because EBITDA and revenue accrue to all capital providers before interest. Comparing a levered firm to an unlevered peer on a pure equity multiple imports the financing decision into what was meant to be an operating comparison, which is why the two measures cannot be used interchangeably.

Capitalization is the organising variable of the equity universe. Large-, mid-, small- and micro-cap boundaries are provider-specific rather than fixed by regulation, and are often defined by cumulative percentiles of a market's total capitalization rather than absolute dollar thresholds, so the cutoffs drift as markets rise. Style frameworks then cross size against value and growth characteristics, and mandates, benchmarks and peer groups are built on those cells.

Most broad indices weight constituents by float-adjusted market capitalization rather than full capitalization. The reason is investability: a passive fund can only buy shares that actually trade, so weighting by locked-up stock would set targets no manager could fill. Float adjustment also curbs distortions from partially privatised state enterprises and family-controlled listings. Price-weighted and equal-weighted indices ignore capitalization entirely, which is the source of their different behaviour.

At Level I you should be able to compute capitalization from a price and a share count, adjust it for a buyback or an issuance, and confirm that a split, a stock dividend or a reverse split leaves it unchanged. You should also be able to run the enterprise value bridge in both directions and explain why a cash-rich company can carry an enterprise value well below its equity value.

Beyond mechanics, treat capitalization as a market opinion, not an accounting fact. It reflects consensus expectations about future cash flows and the discount rate applied to them, so it diverges from book value of equity by whatever the market assigns to intangible assets, growth options and franchise strength. Movements in the ratio of price to book value across a market therefore signal a repricing of expectations rather than a change in recorded assets.