Glossary A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 1 | 3 | 4 | 5 Definitions by InvestorWords.com   What is...? stock split Same as split. An increase in the number of outstanding shares of a company's stock, such that each shareholde's proportionate equity in the company remains the same. The market price per share drops proportionately. Usually done to make a stock with a very high per-share price more accessible to small investors. Requires approval from the board of directors and shareholders. Copyright ©2009 by InvestorGuide.com. All Rights Reserved.