Share buybacks explained: how they work, the EPS effect and buybacks vs dividends

A share buyback (or share repurchase) is when a company uses its own cash to buy back its shares from the market or from shareholders. The repurchased shares are cancelled or held in treasury, so there are fewer shares in issue and each remaining share owns a larger slice of the company’s profits and assets. Buybacks are, alongside dividends, the main way listed companies return cash to their owners.

This guide covers how buybacks are carried out, what they do to earnings per share and to the value of each share, how they compare with dividends, and why traders of shares and share CFDs should understand them. For the related topic of dividend dates and adjustments, see dividends and corporate actions.

Why companies buy back shares

Companies give several reasons, and in practice it is usually a mix:

• Returning surplus cash. A business generating more cash than it can sensibly reinvest can hand it back to shareholders.
• Flexibility. A dividend, once set, is something investors expect to continue; cutting it is usually taken badly. A buyback can be scaled up or down, or stopped, with less fuss.
• Offsetting dilution. Companies that pay staff partly in shares issue new shares every year. Buybacks are often used to keep the share count from rising.
• Signalling. Management may be saying it believes the shares are undervalued.
• Capital structure. Some companies fund buybacks with borrowing to move towards a target level of debt.
• Earnings per share. Fewer shares mechanically raise earnings per share, and some executive pay schemes are linked to EPS. This is the reason critics focus on.

How buybacks are carried out

Open-market repurchases

The most common method. The company announces an authorised programme, say up to a certain amount of money or number of shares over a period, and then buys shares on the exchange through a broker over weeks or months, like any other buyer. It is not obliged to complete the programme.

To avoid being accused of manipulating its own share price, a company usually follows safe-harbour rules on how much it buys each day, when and at what price. In the US the SEC’s Rule 10b-18 provides such a safe harbour; in the UK and EU, the Market Abuse Regulation has its own conditions for buyback programmes. Companies also generally avoid buying when they hold unpublished price-sensitive information, for example in the weeks before results, though pre-arranged trading plans can allow buying to continue.

Accelerated share repurchases

In an accelerated share repurchase (ASR), a company pays a bank a large sum up front and receives most of the shares immediately. The bank borrows the shares to deliver them, then buys in the market over the following months to cover its position. The final number of shares is settled at the end based on the average price over the period. ASRs reduce the share count quickly.

Tender offers

The company offers to buy a set number of shares directly from shareholders, usually at a premium to the market price, during a fixed window. In a fixed-price tender everyone is offered the same price; in a Dutch auction, shareholders state the lowest price they would accept within a range, and the company picks a single price that buys the amount it wants. Tenders are corporate actions in their own right, with announcements and deadlines.

Shareholder approval

Rules vary. In the US the board can usually authorise a buyback itself. In the UK, companies need shareholders to approve the authority, normally at the annual general meeting, and the authority sets a maximum number of shares and price limits.

Taxes on buybacks

Since January 2023, the United States has applied a 1% excise tax on the value of shares repurchased by most US-listed domestic companies, introduced by the Inflation Reduction Act of 2022. The company pays it, not the selling shareholders, and new share issues in the year can be netted against repurchases. Other countries have their own rules, including stamp duty on share purchases in some markets such as the UK.

Cancelled shares and treasury shares

Repurchased shares are either cancelled, so they cease to exist, or kept as treasury shares. Treasury shares carry no votes and receive no dividends while held, and do not count as outstanding for earnings per share. The company can later reissue them, for example to satisfy employee share plans. When you read a share count, check whether it is basic shares outstanding (excluding treasury) or a diluted count that includes options and awards.

The earnings per share effect

Earnings per share (EPS) is net income divided by the number of shares outstanding. A buyback reduces the denominator. But the cash spent also had a use: it was earning interest, or it could have paid down debt. So the buyback also slightly reduces net income. Whether EPS rises depends on the balance between the two.

Worked example: when a buyback lifts EPS

Illustrative numbers. A company has:

• Net income of 1,000 million.
• 500 million shares outstanding, so EPS = 1,000 ÷ 500 = 2.00.
• Share price 40.00, so a P/E of 20.
• 1,000 million of surplus cash earning 4% interest, taxed at 21%.

It spends all 1,000 million buying back shares at 40.00, which retires 25 million shares.

• Lost interest after tax: 1,000 × 4% × (1 − 0.21) = 31.6 million.
• New net income: 1,000 − 31.6 = 968.4 million.
• New share count: 500 − 25 = 475 million.
• New EPS: 968.4 ÷ 475 ≈ 2.039, a rise of about 1.9%.

Total profit fell, yet EPS rose. This is why it is worth checking whether EPS growth comes from a growing business or a shrinking share count.

Worked example: when a buyback dilutes EPS

Now the same company, but the share price is 80.00, a P/E of 40. The same 1,000 million buys only 12.5 million shares.

• New net income: still 968.4 million.
• New share count: 487.5 million.
• New EPS: 968.4 ÷ 487.5 ≈ 1.986, a fall of about 0.7%.

The rule of thumb: a cash-funded buyback raises EPS when the earnings yield on the shares (EPS ÷ price, the inverse of the P/E) is higher than the after-tax return the cash was earning. At 40.00 the earnings yield is 5%, above the 3.16% after-tax return on cash. At 80.00 it is 2.5%, below it. Our guide to the P/E ratio and valuation basics explains earnings yield in more detail.

EPS is not value: the price paid matters

Higher EPS does not automatically make shareholders richer. What matters is the value of each share, and that depends on the price the company pays.

Worked example: fair price, cheap price, expensive price

Illustrative numbers. A company holds 1,000 million in cash and runs a business worth 19,000 million, so the whole company is worth 20,000 million. It has 500 million shares, so each is worth 40.00.

• Buyback at a fair price of 40.00. The company spends 1,000 million on 25 million shares. It is left with the business, worth 19,000 million, and 475 million shares. Value per share: 19,000 ÷ 475 = 40.00. Unchanged.
• Buyback at a high price of 50.00. The 1,000 million buys only 20 million shares. Remaining value per share: 19,000 ÷ 480 ≈ 39.58. The shareholders who sold received more than their shares were worth, at the expense of those who stayed.
• Buyback at a low price of 32.00. The 1,000 million buys 31.25 million shares. Remaining value per share: 19,000 ÷ 468.75 ≈ 40.53. The holders who stayed gained.

The market price is not the same as true value, and nobody knows true value precisely. But the principle holds: a buyback is a good use of cash only if the shares are bought for less than they are worth. Companies that buy heavily at market peaks and stop in downturns, when shares are cheapest, often destroy value even while their EPS rises.

Gross versus net buybacks

Many companies, particularly in technology, pay a large part of staff compensation in shares. Each year they issue new shares and buy back others. The gross buyback figure in the headlines can be much larger than the net reduction in shares outstanding. To see what is really happening, compare the diluted share count over several years, which you can find in quarterly and annual reports. Our guide on how to read an earnings report shows where to find it.

Buybacks versus dividends

Both hand cash to shareholders. In a simplified world with no taxes or costs, they are equivalent: a shareholder who wants cash from a buyback can sell a few shares, and one who receives a dividend but wants to stay invested can buy more shares. In practice they differ.

Who receives the cash

• Dividend: every shareholder receives cash in proportion to their holding, whether they want it or not.
• Buyback: only shareholders who sell receive cash. Those who hold on receive nothing now but own a larger share of the company.

Tax

In many countries dividends are taxed as income when paid, while a holder who does not sell under a buyback pays no tax until they eventually sell, usually under capital gains rules. That deferral is one reason buybacks became popular. Tax treatment depends entirely on where you live and your circumstances.

Flexibility and signalling

A regular dividend creates an expectation; cutting it often hits the share price hard. Buyback programmes can be paused quietly. That flexibility is useful for companies with uneven cash flows but makes buybacks a weaker signal of commitment.

Effect on the share price

On a dividend’s ex-date the share price usually drops by roughly the dividend amount, because cash leaves the company. A buyback has no ex-date; the company buys gradually, and its buying adds demand in the market.

Shareholder yield

Because both return cash, some investors look at shareholder yield: dividends plus net buybacks over the past year, divided by market value. A company with a modest dividend yield but large net buybacks can return more cash in total than a high-dividend payer. The growth vs value stocks guide touches on how payout policies differ between the two styles.

What buybacks mean for traders

Share CFDs

On a share CFD, a dividend triggers a cash adjustment on the ex-date: longs are credited, shorts are debited, as explained in stock CFDs vs real shares. An open-market buyback triggers nothing of the kind. Its effect reaches you only through the share price. A tender offer is different: it is a formal corporate action, and providers decide how to treat CFD positions, which often means CFD holders cannot participate directly. Check the provider’s corporate action notices.

Announcement days

A new or larger buyback is often announced with results. The news can move the share on the day, but the reaction depends on what the market expected and on the rest of the results. Our guide to earnings season covers those days, including the gap risk for positions held through an announcement.

Index-level demand

Across a whole market, companies buying their own shares are a meaningful source of demand. When companies enter their pre-results quiet periods and pause buying, that demand temporarily falls away. This is often discussed in market commentary about US indices, though the size of the effect is hard to measure and easy to overstate. See what is a stock index for how company share counts feed into index weights.

Short sellers

A shrinking share count reduces the free float over time, and a company buying steadily is a persistent buyer. Neither prevents a share from falling, but both are worth knowing about when you hold a short position. See short selling stocks explained.

Risk and sizing

None of this changes the basic arithmetic of a leveraged position. Share CFDs are capped at 5:1 leverage for retail clients under ESMA rules, financing is charged nightly on the full position, and most retail CFD accounts lose money. Size every trade from the loss you can accept, using the position size calculator, and read the risk warning.

How to assess a buyback quickly

When a company announces a buyback, a few questions help separate substance from headline:

1. How big is it relative to market value? A programme worth 1% of market value is modest; 10% is large.
2. How is it funded? From free cash flow, existing cash, or new borrowing? Debt-funded buybacks raise financial risk.
3. Is it net or gross? Will the share count actually fall, or is it offsetting share-based pay?
4. What price is the company paying? Compare valuation ratios with the company’s own history and peers.
5. Has the company followed through before? An authorisation is not a commitment, and some programmes are never completed.

Common mistakes

• Reading EPS growth as business growth. Check net income and revenue alongside EPS.
• Assuming every buyback creates value. Overpaying for shares transfers value to those who sell.
• Taking the headline amount at face value. Gross buybacks can hide steady share issuance.
• Expecting a CFD adjustment. Open-market buybacks do not trigger cash adjustments on CFDs; dividends do.
• Treating a buyback as a price floor. Companies can and do stop buying, and shares with large buybacks can still fall sharply in a bear market.

Frequently asked questions

What happens to shares when a company buys them back?

They are either cancelled, which permanently reduces the number of shares in issue, or held as treasury shares. Treasury shares have no votes, receive no dividends and are excluded from shares outstanding, but the company can reissue them later.

Do buybacks increase the share price?

They add demand while the company is buying and reduce the number of shares over which future profits are divided. Whether the price rises depends on everything else affecting the share, including earnings, interest rates and market sentiment. A buyback does not stop a share from falling.

Why do buybacks increase earnings per share?

EPS is net income divided by shares outstanding. A buyback reduces the number of shares. If the profit lost by spending the cash, such as forgone interest, is smaller than the effect of the reduced share count, EPS rises even though total profit has not grown.

Are buybacks better than dividends?

Neither is better in general. Buybacks give flexibility and, in many tax systems, let shareholders defer tax; dividends give every holder cash directly and signal a firmer commitment. A buyback at too high a price is worse for remaining shareholders than paying the same cash as a dividend.

Do I benefit from a buyback if I hold a share CFD?

Only through any effect on the share price. Open-market buybacks do not trigger cash adjustments on CFDs, unlike dividends. Tender offers are handled as corporate actions, and CFD holders often cannot take part directly.

What is a Dutch auction tender offer?

A buyback where the company sets a price range and shareholders state the lowest price within it at which they would sell. The company then picks the lowest single price that lets it buy the number of shares it wants and pays that price to everyone who tendered at or below it.