A stock buyback (or share repurchase) is when a company uses its own cash to buy its own shares back from investors. The shares it buys are either cancelled or held as treasury stock. Either way they stop counting as shares outstanding, so every remaining share represents a slightly larger slice of the business.
Think of a pizza cut into eight slices. If the pizzeria buys two slices back and takes them off the table, the six people still holding a slice each now own a sixth of the pizza instead of an eighth. Nothing about the pizza changed. The ownership did.
How a buyback actually happens
The board first approves an authorisation: permission to spend up to a certain amount, or to buy up to a certain number of shares, usually over one to three years. An authorisation is a ceiling, not a promise. Companies often leave part of it unused, and they can pause or cancel it without notice.
Execution then happens in one of a few ways. Most repurchases are open-market purchases: a broker buys shares on the exchange over weeks or months, like any other investor, within rules that limit volume and timing (in the US, SEC Rule 10b-18; in the EU and UK, the Market Abuse Regulation safe harbour). Larger or faster programmes may use an accelerated share repurchase, where a bank delivers most of the shares up front, or a tender offer, where the company invites all holders to sell at a stated price or within a price range. Our guide to buyback methods covers each one.
Why companies buy back their shares
- Returning surplus cash. When a business earns more than it can reinvest at good returns, the cash has to go somewhere. Buybacks are the alternative to dividends.
- Flexibility. A dividend cut is treated as a crisis signal. A paused buyback barely makes the news. Management therefore prefers to put the steady part of returns in the dividend and the variable part in buybacks.
- Offsetting dilution. Employee stock compensation creates new shares every year. Many technology companies buy back mainly to stop the share count from drifting upward. See net buybacks and stock-based compensation.
- Signalling. A board that believes the shares are undervalued can say so with cash rather than words. The signal only works if the company follows through.
- Per-share metrics. Fewer shares means higher earnings per share, even on flat profits. This is mathematically true and also where most of the criticism of buybacks comes from.
- Tax. In many countries a buyback is taxed more lightly than a dividend for the typical investor. The details differ by country, and in the Netherlands they differ a lot.
How big is this?
Very. Companies in the S&P 500 spent roughly $940 billion on repurchases in 2024, more than they paid out in dividends, and the pace has stayed near record levels since. A single company, Apple, has retired well over a third of its shares since 2013. In Europe, buybacks were rare before the 2010s and are now routine among banks, energy majors and consumer-goods groups. The rankings on this site show where the money is going right now.
What changes for you
If you keep your shares, you own a larger share of the company and of its future profits and dividends. Your position does not pay you cash, so you are trusting management to have bought at a sensible price. If you sell, you have simply sold shares, and the company happened to be the buyer.
Where to go next
Start with buyback yield to put the dollar figures in proportion, then read how to evaluate a buyback for the checklist we use when we look at a company.