Share repurchase, also known as share buyback or stock buyback, is the reacquisition by a company of its own shares. It represents an alternative way of returning money to shareholders instead of dividends. Repurchases allow stockholders to legally reduce taxes, where instead of paying tax on dividends they pay the lower taxes on the capital gains when selling the stock, whose price is now proportionally higher because of the smaller number of shares outstanding.
In most countries, a corporation can repurchase its own stock by distributing cash to existing shareholders in exchange for a fraction of the company's outstanding equity; that is, cash is exchanged for a reduction in the number of shares outstanding. The company either retires the repurchased shares or keeps them as treasury stock, available for reissuance.