What Is a Share Buyback?
A share buyback, also called a share repurchase, is when a company buys back its own stock from existing shareholders. The repurchased shares are typically retired or held as treasury stock, which shrinks the number of shares outstanding. Along with dividends, buybacks are one of the two main ways companies return cash to shareholders.
Most buybacks happen through open-market purchases executed gradually over months, but companies can also run tender offers, where they offer to buy a set number of shares at a stated price, or negotiate accelerated share repurchase programs with banks.
How It Works
When shares are repurchased, the company's cash goes down and its share count goes down, but total earnings are unchanged, so earnings per share rises. Remaining shareholders own a larger percentage of the same business without buying anything.
Unlike dividends, buybacks are flexible: a company can announce a large authorization and then repurchase opportunistically, slowing down or stopping without the negative signal that cutting a dividend sends. Critics note that buybacks can be used to offset dilution from stock compensation or to flatter EPS when the stock is actually expensive.
Example
Suppose a company has 100 million shares outstanding, 500 million dollars of net income, and a stock price of 50 dollars, so EPS is 5.00 dollars. It spends 500 million dollars buying back 10 million shares at 50 dollars each.
Share count falls to 90 million, and EPS rises to 500 million divided by 90 million, or about 5.56 dollars, an increase of roughly 11 percent with no change in the underlying business. Whether that created value depends on whether 50 dollars was a good price relative to the company's intrinsic value.
Why It Matters
Buybacks have become the dominant form of shareholder return for large US companies, often exceeding dividends in total dollars. They affect EPS-based valuation multiples, per-share growth rates, and how analysts model share counts.
In investment banking, equity capital markets and M&A teams routinely model buyback capacity and accretion, and in interviews you may be asked how a buyback changes EPS, book value, and key ratios.
