Share buybacks explained: when they help owners and when they do not

A share buyback, or repurchase, is when a company uses its cash to buy its own shares from investors. It is one of the main ways companies return money to shareholders, alongside dividends. Buybacks can add to the value of what remaining owners hold, but only under the right conditions, and they are sometimes misunderstood.

How buybacks work

Most buybacks happen through open-market purchases over time. Companies can also use tender offers, in which they offer to buy a set number of shares at a stated price, or accelerated programs arranged with a bank. A board typically approves an authorization, a ceiling on the amount or number of shares that may be bought. An authorization is permission, not a commitment, so a company can buy less than authorized, or nothing at all.

In the US, an SEC safe harbor (Rule 10b-18) sets conditions for how open-market repurchases are carried out, covering things like timing, price and volume, so that purchases are not treated as market manipulation.

Repurchased shares are either retired or held as treasury stock. Treasury shares are no longer counted as outstanding, and they do not vote or receive dividends. On the balance sheet they reduce shareholders' equity. In the cash flow statement, repurchases appear under financing activities. See how to read a cash flow statement.

Since January 2023 the US has levied a 1% excise tax on net stock repurchases by publicly traded domestic corporations, which is paid by the company.

What buybacks do to the numbers

Fewer shares outstanding means each remaining share represents a bigger slice of the company's earnings and assets. Earnings per share rise even if the company's total profit is unchanged.

EPS = Net income / Weighted average shares outstanding
Net buyback yield = (Shares repurchased - Shares issued, in dollars) / Market capitalization
Shareholder yield = Dividend yield + Net buyback yield

Example (illustrative numbers)

A company earns $1,000 million with 100 million shares outstanding, so EPS is $10. The share price is $200, which is a price-to-earnings ratio of 20, or an earnings yield of 5%.

It spends $500 million buying 2.5 million shares at $200. With 97.5 million shares left and the same $1,000 million of profit, EPS becomes about $10.26, a rise of roughly 2.6%.

Two cautions. First, the cash had alternatives. If it would have earned interest, profit would be slightly lower after the buyback, so the EPS gain would be a bit smaller. Second, the return on a buyback is roughly the earnings yield at the price paid. Buying at $200 with $10 of EPS "earns" about 5% on the cash. If the company paid $400 per share, the same cash would buy a 2.5% earnings yield.

Now consider a different case. The company grants employees 2 million new shares a year through stock compensation and spends $400 million (2 million x $200) buying back 2 million shares. The share count is unchanged. The buyback absorbed the cash needed to stand still, and no value was returned to owners. See stock-based compensation and dilution.

When buybacks help owners

• The price paid is below what the business is reasonably worth. Buying at a discount adds value for remaining owners, and buying at a premium transfers value to the sellers.
• The cash is surplus, funded by free cash flow after the company has paid for the investments and maintenance its business needs.
• The balance sheet stays healthy, with debt at manageable levels.
• The net share count actually falls over time, rather than just offsetting issuance.
• Management has a record of capital allocation discipline.

When they do not

• Buying at high valuations. Repurchasing shares at an inflated price destroys value for those who stay.
• Borrowing to fund them. Debt-funded buybacks raise financial risk. See debt-to-equity ratio.
• Offsetting dilution only. As in the example above, spending cash to keep the share count flat.
• Crowding out investment. Spending on repurchases instead of research, capacity or acquisitions with higher returns.
• Cosmetic EPS management. A buyback can lift EPS growth even when the underlying business is flat. Compare EPS growth with growth in net income.
• Pro-cyclical timing. Buyback spending often rises when profits and prices are high and falls in downturns, which is the opposite of buying at a discount.

Buybacks versus dividends

Dividends are paid to all holders and are generally taxed when received. Buybacks are flexible, and holders who do not sell owe no tax until they eventually sell their shares. Companies often treat dividends as a commitment that is hard to cut and buybacks as adjustable. Both returns of capital should be measured against what the company could earn by reinvesting. See dividend payout ratio.

How to check a company's buybacks

1. Look at the repurchase line in the cash flow statement over several years.
2. Compare the diluted share count over time. See basic vs diluted EPS.
3. Check whether repurchases were funded by free cash flow or by debt.
4. Compare the average price paid with the company's valuation range at the time.

Where to see it on StocksXray

A stock page includes a dilution check among its red flags, and its SEC filings list links to the underlying documents so you can verify the repurchase figures.

Key takeaways

• A buyback shrinks the share count, which raises EPS and each remaining holder's share of the company.
• Value depends on price: buying below worth helps, buying above worth hurts remaining owners.
• A buyback that only offsets stock-based compensation leaves the share count flat.
• Check net share count, funding source and valuation before treating a buyback as good news.