Stocks · Intermediate · 5 min

Share buybacks

You can explain how a share buyback works, calculate its effect on earnings per share, and compare it with paying a dividend.

Buying itself

A profitable company often ends the year with more cash than it needs. It has three main options: invest it in the business, pay it out as a dividend, or use it to buy its own shares from the market.

The third option, the share buyback, has become one of the largest flows of money in stock markets. It sounds technical, but the effect on shareholders is simple to calculate, and so is its catch.

Fewer shares, bigger slices

In a share buyback, a company buys its own shares, usually on the stock market over months, and often cancels them. Fewer shares remain, and each remaining share represents a larger part of the company.

The most quoted effect is on earnings per share, or EPS: the company's profit divided by the number of shares. If profit stays the same and the number of shares falls, EPS rises.

For shareholders, a buyback works like a dividend in some ways:

Cash leaves the company and goes to shareholders, but only to those who sell.
Shareholders who keep their shares end up owning a larger part of the company without paying for it.
In some countries, this is taxed differently from a dividend, because no payment reaches those who do not sell.

Buybacks are regulated. In the US, SEC Rule 10b-18 gives companies a safe harbor from manipulation claims if they follow conditions on timing, price and volume. Since 2023, listed US companies also pay an excise tax of 1% on the value of their net repurchases, introduced by the Inflation Reduction Act. In the EU, the Market Abuse Regulation sets conditions and disclosure duties for buyback programmes.

A buyback is also an investment decision. Buying shares at a high price can waste money, just as overpaying for any other asset would.

EPS 1.00 → 1.11

A fictional company earns a profit of 100 million and has 100 million shares. The share trades at 20.

EPS before: 100 million ÷ 100 million = 1.00.
The company spends 200 million to buy back 10 million shares and cancels them.
EPS after: 100 million ÷ 90 million ≈ 1.11, about 11% higher.

The business earns exactly the same. The company has 200 million less cash. Whether the buyback was a good use of that money depends on whether the shares were worth more than 20. Compare a dividend: the same 200 million could have paid 2 per share to every shareholder. With the buyback, only those who sold received cash, and those who kept their shares now own about 11% more of the company each.

Common mistakes

Reading rising EPS as growth. It may come from fewer shares, not more profit.
Assuming buybacks always help. Buying at high prices can destroy value.
Ignoring new shares issued at the same time. Shares for employees can cancel out a buyback.
Treating an announcement as a done deal. Companies announce programmes they may never complete.

The takeaway

In a buyback, a company buys its own shares. Fewer shares raise each one's share of profits, but the cash leaves the company.

Check yourself

Quick quiz

4 questions. Instant feedback, nothing is saved.

1Tap the side with the higher earnings per share.

Tap the chart.

The same profit is divided by fewer shares: 100 million ÷ 90 million ≈ 1.11 per share.
2Does a higher EPS after a buyback mean the business earns more?

A buyback changes the number of shares, not the business. And the cash spent is no longer available to the company.
3Which tax applies to share buybacks of listed US companies since 2023?

The Inflation Reduction Act of 2022 introduced a 1% excise tax on net repurchases by publicly traded US corporations.
4A company buys back shares at a very high price, and the price later halves. What happened to the shareholders' money?

A buyback is an investment in the company's own shares. Buying at a high price can destroy value, like any bad investment.

of 4 correct.