Stock Buybacks Explained: When They Help and When They're a Red Flag
Updated: 5 hours ago
A stock buyback is when a company uses its own cash to buy back and usually cancel its shares, so each remaining share owns a bigger slice of the business. Buybacks are great when the shares are bought below intrinsic value with genuinely spare cash. They are a red flag when they are done at high prices, funded with debt, or simply soak up shares issued to employees. The mechanism is neutral. The price paid and the reason behind it decide whether you gain or lose.
This guide explains how buybacks work, the maths behind good and bad ones, and four questions to test any buyback programme.
Where this fits: buybacks are a key part of Criterion 3 (aligned management) in the Five Criteria. For the full management test, see the hub, how to evaluate management before you invest.
What Is a Stock Buyback?
A share repurchase, or buyback, happens when a company buys its own shares, usually on the stock market. The shares bought back are typically cancelled or held in treasury, so the number of shares outstanding falls.
It is the mirror image of dilution. Dilution shrinks your slice of the company. A buyback enlarges it, without you buying another share.
Here is the simple arithmetic. A company earns 100 million dollars and has 100 million shares, so earnings per share are 1.00 dollar. If it buys back 10 million shares, the same 100 million dollars is now split across 90 million shares. Earnings per share rise to about 1.11 dollars.
That is why buybacks are popular. But higher earnings per share is not the same thing as more value. That depends on the price paid.
Why Companies Buy Back Shares
Companies give several reasons, and they are not equally good:
To return surplus cash. The business generates more cash than it can reinvest well.
Because the shares are cheap. Management believes the price is below what the business is worth.
To offset dilution. Shares issued to employees through stock-based compensation are bought back to keep the share count stable.
To lift earnings per share. Sometimes linked to executive bonus targets. This is the problematic one.
Knowing which motive is really at work is the whole game.
When Buybacks Create Real Value
A buyback creates value for the shareholders who stay when the company pays less than the shares are worth. Warren Buffett set out the test clearly in his 2011 letter. He wrote that he and Charlie Munger favour repurchases when two conditions are met: the company has ample funds for its operational and liquidity needs, and the stock sells at a material discount to intrinsic business value, conservatively calculated.
Both conditions matter. The first protects the balance sheet. The second makes sure the purchase is an investment, not a gift to selling shareholders.
The maths of a good and a bad buyback
Company A has 100 million shares and an intrinsic value you estimate at 5 billion dollars, or 50 dollars a share. It has cash available for buybacks and buys 10 million shares.
Scenario | Price paid | Cash spent | Value left | Value per share after |
Before buyback | n/a | n/a | 5,000m | 50.00 |
Buy at 30 dollars | 30 | 300m | 4,700m | 52.22 (up 4.4%) |
Buy at 50 dollars | 50 | 500m | 4,500m | 50.00 (no change) |
Buy at 80 dollars | 80 | 800m | 4,200m | 46.67 (down 6.7%) |
In all three cases, earnings per share rise by the same amount, because the share count falls by the same 10%. But only the first creates value for continuing owners. The third destroys it, while still making earnings per share look better. That is why you should never judge a buyback by its effect on earnings per share alone.
What the great allocators did
William Thorndike's The Outsiders describes CEOs who treated buybacks as one option among several. The best-known example is Henry Singleton of Teledyne. Thorndike reports that Teledyne repurchased roughly 90% of its shares during the 1970s and early 1980s, when its shares traded at low valuations. In earlier years, when the shares were expensive, Singleton had done the opposite and issued them to fund acquisitions.
The lesson is not "always buy back shares." It is "buy when cheap, and be willing to stop when the price is high." You can read more about this approach in the hierarchy of capital allocation.
When Buybacks Are a Red Flag
1. Buying at high prices
Many companies buy back the most shares when business is booming and share prices are high, then cut back sharply in downturns when prices are low. In the broad US market, buyback spending fell sharply in both 2009 and 2020, just when shares were cheapest. That is the reverse of what an owner would do.
2. Buybacks funded with debt
Borrowing to buy back shares raises financial risk and lifts earnings per share at the same time. It can make sense in small doses for a very stable business at a low price. As a habit, it weakens the balance sheet just when a downturn might test it. Check the result against the Criterion 4 threshold of net debt no more than 2 times EBITDA; see how much debt is too much.
3. Buybacks that do not reduce the share count
This is the most common and least noticed problem. A company announces a large buyback, but issues just as many new shares to employees. If it buys 20 million shares and issues 25 million through stock-based compensation, the share count still rises. The buyback is really paying employees in cash through the back door. See stock dilution explained.
4. Buybacks tied to bonus targets
If executives are paid on earnings per share growth, buybacks become a shortcut to hitting targets, regardless of price. Look in the proxy statement or remuneration report for whether per-share targets adjust for buybacks.
5. Buybacks instead of needed investment
If a company is starving its core business of investment or research to fund buybacks, the higher earnings per share today may come at the cost of a weaker business tomorrow.
How to Evaluate Any Buyback Programme: Four Questions
Is the share count actually falling? Pull diluted shares outstanding for the last five years from the annual reports. Announcements do not count; the share count does.
What price is management paying? Many companies disclose the average price paid each quarter. Compare it with your own estimate of intrinsic value and with the share price history.
How is it funded? Buybacks funded by free cash flow are fine. Buybacks funded by rising debt need a hard look.
What are the alternatives? If the company has high-return reinvestment opportunities, those should come first.
A note on how management talks about buybacks
Having worked in investor relations, I pay close attention to the wording used. Good capital allocators explain buybacks in terms of value: "we believe our shares are trading below intrinsic value, so repurchases are the best use of cash." Weaker teams describe them only as "returning capital to shareholders," with no reference to price. The first shows discipline. The second may simply be habit.
How We Use This in the Five Criteria
Buybacks feed directly into Criterion 3, aligned management. Our house default threshold is simple: the share count should be flat or falling over five years. A buyback programme passes our test when:
Net shares outstanding actually fall over time, after stock compensation.
Repurchases are funded by free cash flow, not by pushing debt above 2 times EBITDA.
Management buys more when the shares are cheap and less when they are expensive.
Management can explain the buyback in terms of value, not just earnings per share.
Buybacks also touch Criterion 5. If you think the shares are expensive, so are the company's own purchases of them.
Common Mistakes
Treating every buyback as good news. The price paid decides the outcome.
Trusting the headline number. A 5 billion dollar programme means little if 5 billion dollars of shares are issued to staff.
Judging by earnings per share. EPS rises after almost any buyback, even a value-destroying one. Read more on earnings per share.
Ignoring the balance sheet. Debt-funded buybacks can turn a sound company into a fragile one.
Frequently Asked Questions
Are stock buybacks good for shareholders? They are good when shares are bought below intrinsic value with spare cash. At fair value they are roughly neutral, and above it they transfer value from remaining shareholders to those who sell.
Why does a buyback increase earnings per share? Because the same earnings are divided among fewer shares. That rise happens whatever price is paid, which is why EPS alone cannot tell you whether a buyback was wise.
Do buybacks push up the share price? They can add buying demand in the short term, but the long-term effect depends on value per share. A buyback at a high price does not create lasting value.
How can I tell if a company is actually reducing its share count? Compare diluted shares outstanding in the annual reports over five years. If the number is not falling, the buyback is at best offsetting dilution.
Your Next Step
Choose a company that advertises a large buyback and check its share count over the last five years. Then compare buybacks with the other way of returning cash in stock buybacks vs dividends. Finally, score the company on all five criteria using the Five Criteria Checklist.
About the author: Cameron Hayes is a senior investor relations and finance professional who has worked in IR at Nasdaq Copenhagen-listed companies including Nilfisk and Maersk Drilling. He holds an MSc from Copenhagen Business School and a BCom from the University of Ottawa, and founded Gingernomics to teach individual investors the Five Criteria framework. More about Gingernomics.
The content on Gingernomics is for educational and informational purposes only and does not constitute financial advice. Always do your own research and consult a licensed financial advisor before making any investment decisions. Past performance is not indicative of future results.
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