Shares Outstanding

Shares outstanding is the total number of a company's shares currently held by all investors — insiders, institutions, and the public combined. It is the denominator in per-share math: EPS, book value per share, and market cap all depend on it.

The count is not fixed. Buybacks shrink it, stock issuance and employee stock compensation grow it, and splits multiply it without changing anyone's ownership. A company that buys back 3% of its shares a year lifts EPS 3% annually before the business grows at all; one that issues 8% a year in stock comp quietly claws that much back from holders.

Shares outstanding is not the float — the float excludes insider and restricted shares that do not trade. A stock can have 100M shares outstanding and a 10M float, and it will trade like a 10M-share stock.