An increase in the number of outstanding shares by a corporation, through the issuance of a set number of shares to a shareholder for a set number of shares that the shareholder already owns. For example, a corporation might declare a '2-for-1 stock split.' This means that for every share of stock an investor owns, he/she will be given another, thus owning 2 shares instead of 1. There will be a corresponding reduction in equity value per share. In this case, the new shares (post-split) will be worth one-half their previous value but the investor will own twice as many shares.