Glossary · UK
What is Share Buyback?
A corporate action in which a company repurchases its own shares from shareholders, reducing the number of shares in issue and typically increasing earnings per share and the value of remaining shares.
Full Definition
A share buyback (also called a share repurchase) is a corporate action in which a company buys back its own shares from the market or directly from shareholders, using its own cash reserves, and then either cancels those shares or holds them in treasury. Companies carry out buybacks for several reasons: to return surplus cash to shareholders as an alternative to paying a larger dividend, to increase earnings per share and other per-share metrics by reducing the total number of shares in issue over which profits are divided, to offset the dilutive effect of new shares issued under employee share schemes, or because management believes the shares are undervalued by the market and buying them represents good use of company funds. From the perspective of a shareholder who sells shares back to the company as part of a buyback, the transaction is generally treated as a disposal for Capital Gains Tax purposes in the same way as selling shares to any other buyer, with any gain calculated against the shareholder's Section 104 pool cost and taxed at 18% (basic rate) or 24% (higher rate) after deducting the GBP 3,000 annual exempt amount for 2026/27, though in certain circumstances -- particularly for unlisted or closely-held trading companies -- a buyback can instead be treated as an income distribution (effectively a dividend) rather than a capital disposal, subject to specific conditions under the Corporation Tax Act 2010 that companies and advisers must check carefully before relying on capital treatment. For shareholders who do not participate in a buyback and simply continue holding their shares, there is no immediate tax consequence, but the reduction in the total number of shares in issue means their proportionate ownership of the company increases slightly, and the market often responds positively to a buyback announcement since it signals management's confidence in the company's prospects and increases scarcity value, though critics sometimes argue that buybacks can be used to flatter short-term earnings-per-share figures rather than reinvesting in long-term growth. Buybacks are common among large, cash-generative listed companies and are one of two main ways -- alongside ordinary dividends -- that public companies typically return capital to shareholders, with the choice between the two often depending on tax considerations for the shareholder base, the certainty of cash flows, and whether management wants the flexibility to vary or pause the return of capital more easily than a dividend commitment usually allows.