Authorized vs Issued Shares
Authorized shares are the maximum number of shares a corporation is legally permitted to issue as stated in its certificate of incorporation; issued shares are the subset of authorized shares that have actually been sold or granted to shareholders, with the difference representing shares available for future issuance.
The distinction between authorized and issued shares is foundational to corporate capital structure. A company's certificate of incorporation (filed with the state of incorporation — typically Delaware for most US public companies) specifies the total number of shares the company is authorized to issue across all classes. Increasing the authorized share count requires a formal amendment to the certificate, which in turn requires a shareholder vote.
Issued shares are authorized shares that have been formally issued to shareholders through sales, equity compensation grants, stock dividends, or conversions of other instruments. Of these, outstanding shares are issued shares that are currently held by external shareholders — excluding treasury shares the company has repurchased and holds in its own name. Outstanding shares are the standard denominator for calculating basic earnings per share and market capitalization.
Treasury shares are issued shares that the company has bought back through open-market repurchases or tender offers. They are held by the company itself, carry no voting rights, and receive no dividends. They can be retired (reducing authorized share count) or reissued (for employee compensation plans or future financing).
From a governance perspective, companies typically maintain a significant cushion between issued and authorized shares to preserve flexibility for future equity issuances — employee option plan grants, at-the-market equity offerings, convertible note conversions, or acquisition currency. Too small a cushion requires an inconvenient shareholder vote before capital can be raised; too large a cushion (an overhang of unused authorized shares) can concern some shareholders about potential dilution.
For investors, the number of authorized shares relative to issued shares signals how much dilution capacity the board has without seeking shareholder approval. Proposals to increase authorized shares at annual meetings are a common item for institutional shareholder review.