Shares Outstanding

Shares Outstanding is the total number of common shares a company has issued and that are held by investors (both public and insiders). It's a fundamental metric used in calculating earnings per share (EPS), market cap, book value per share, and other per-share metrics.

Formula

Market Cap = Stock Price × Shares Outstanding

Shares Outstanding can increase through new issuances (secondary offerings, employee stock options) or decrease through buybacks and consolidations (reverse splits).

Example

Apple (AAPL) has approximately 15 billion shares outstanding. At a stock price of $200, market cap = 15B × $200 = $3 trillion. Berkshire Hathaway (BRK-B) has a much smaller share count (about 1 billion B shares), but the per-share price is very high.

How to Interpret It

• Declining shares outstanding: Company is buying back shares, reducing share count. If earnings stay flat, EPS rises purely from math.
• Rising shares outstanding: Company is issuing new shares via offerings, option exercises, or acquisitions. This dilutes existing shareholders unless earnings grow faster.
• Share dilution: When a company issues new shares without a corresponding increase in earnings, existing shareholders own a smaller piece of the pie.
• Fully diluted shares: Include shares that could be issued via options, warrants, and convertible securities. Important for true dilution analysis.
• Share count trends: Look at trailing twelve-month (TTM) share count for most current data.

Limitations

• Share count alone is not meaningful; an increase in shares funded by acquisitions of profitable businesses can still increase EPS.
• Options and warrants (dilutive securities) are not counted in basic shares outstanding but dilute shareholders if exercised.
• Different classes of stock (Class A, Class B) complicate the picture; Class A might have different voting rights.
• Historical share counts can be distorted by stock splits and reverse splits.

Related Terms

• Earnings Per Share — net income divided by shares outstanding
• Float — the number of shares available for public trading (excluding insider holdings)
• Market Cap — stock price times shares outstanding
• Dilution — reduction in ownership and EPS per share from new issuances