A proportionate decrease in the number of shares, but not the total value of shares of stock held by shareholders. Shareholders maintain the same percentage of equity as before the split. For example, a 1-for-3 split would result in stockholders owning one share for every three shares owned before the split. After the reverse split, the firm's stock price is, in this example, three times the pre-reverse split price. A firm generally institutes a reverse split to boost its stock's market price. Some think this supposedly attracts investors.