A stock split which reduces the number of outstanding shares and increases the per-share price proportionately. This is usually an attempt by a company to disguise a falling stock price, since the actual market capitalization of the stock does not change at all. For example, if a company declares a one-for-ten reverese split, then a person who previously held 20 shares valued by the market at $1 each will then have 2 shares worth $10 each. Many stock exchanges in the U.S. do not allow companies with a stock price of less than $1 to remain listed, and many such companies then have to undertake reverse splits if they want to remain listed.