A buyback, also known as a share repurchase, is when a company buys its own outstanding shares to reduce the number of shares available on the open market. Companies buy back shares for a number of reasons, such as to increase the value of remaining shares available by reducing the supply or to prevent other shareholders from taking a controlling stake.

When a stock buyback is announced, it means the issuing company intends to repurchase some or all of the outstanding shares originally issued to raise capital. In exchange for giving up ownership in the company and periodic dividends, shareholders are paid the fair market value of the stock at the time of the buyback.

A company may choose to buy back outstanding shares for a number of reasons. Repurchasing outstanding shares can help a business reduce its cost of capital, benefit from temporary undervaluation of the stock, consolidate ownership, inflate important financial metrics or free up profits to pay executive bonuses.