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- A stock buyback happens when a company spends its own cash to repurchase shares of its own stock, shrinking the total number of shares in circulation.
- Buybacks can lift earnings per share and signal management confidence, but they compete with dividends, debt repayment and reinvestment for the same pool of cash.
- Regulators can cap how much a company can buy back in a single day and tax large repurchases, while GCC-listed firms such as Borouge use buybacks alongside dividends to return cash to shareholders.
A stock buyback is when a company uses its own money to purchase its own shares from the open market. Once bought, those shares may be reissued, retired, or used for employee compensation.
Retiring a share removes it permanently from circulation. Fewer shares remain outstanding, and each remaining share represents a slightly larger claim on the company’s future earnings.
Companies fund buybacks from free cash flow, the money left over after covering operating costs and capital spending. Some also borrow to fund repurchases, a choice that carries its own risks.
How Buybacks Move a Share Price
Buybacks work through a straightforward mechanism. When a company reduces its share count, the same earnings get divided among fewer shares.
This raises earnings per share, or EPS, a figure investors watch closely. A higher EPS can make a stock look more attractively valued, even if the underlying business has not grown.
Buybacks also change the balance of buyers and sellers. When a company steps into the market as a large, steady buyer, that added demand can support the share price, particularly during periods of weakness.
Announcing a buyback sends a signal too. Management is telling the market it believes the shares are undervalued relative to the company’s prospects.
That signal only holds weight if it is backed by real cash flow. A buyback funded by debt or announced without the earnings to support it tends to be read differently by experienced investors.
Buybacks vs Dividends: Two Ways to Return Cash
Buybacks and dividends both return cash to shareholders, but they work differently.
A dividend pays cash directly to every shareholder on a set schedule. It is visible, predictable and taxed immediately in most jurisdictions once received.
A buyback returns value indirectly. Shareholders who keep their shares benefit from a smaller share count and, potentially, a higher share price. Shareholders who sell into the buyback realise their gain immediately.
Buybacks give companies more flexibility. A dividend, once introduced, is hard to cut without unsettling investors. A buyback programme can be paused or resized as conditions change, without the same reputational cost.
When Buybacks Lose Their Appeal
Buybacks are not unlimited. In the United States, Rule 10b-18 caps a company’s daily repurchases at 25% of the stock’s average daily trading volume if it wants safe-harbour protection from claims of market manipulation. ⁽¹⁾
Since January 2023, US public companies have also faced a 1% excise tax on the value of shares they repurchase, introduced under the Inflation Reduction Act. The tax was designed to make buybacks marginally more expensive relative to reinvestment. ⁽²⁾
Cash constraints matter more than regulation in most cases. A company facing weaker earnings, rising debt costs or a heavier capital expenditure load has less room to justify large repurchases.
That trade-off is visible across the technology sector today. As firms including Amazon and Microsoft have raised their AI infrastructure spending sharply, some analysts have questioned whether that capital could instead have gone toward larger buyback programmes.
Buybacks Can Also Work Against Shareholders
A buyback is not automatically good for shareholders. Timing determines much of the outcome.
A company that repurchases shares at a high valuation, only to see the price fall afterward, has effectively destroyed value rather than created it. The cash is gone, and shareholders are left holding shares worth less than the company paid for them.
Debt-funded buybacks carry a separate risk. Borrowing to repurchase shares can boost EPS in the short term, but it raises the company’s financial leverage and its exposure if interest rates rise or monetary policy shifts.
Buybacks can also mask stagnant growth. A company with flat earnings can still report rising EPS purely by shrinking its share count, which is why analysts look at revenue and profit growth alongside EPS, not EPS alone.
Takeaways
A stock buyback is one of several tools a company has for returning cash to shareholders, alongside dividends and reinvestment. The right choice depends on cash flow, valuation and the opportunities available to the business.
Recent activity shows how differently the tool gets used. Apple authorised $110 billion in buybacks in 2024, the largest repurchase authorisation in US corporate history, while S&P 500 companies collectively spent a record $942.5 billion on buybacks that same year. ⁽³⁾
Closer to home, ADX-listed Borouge proposed a buyback of up to 2.5% of its shares in 2025, alongside a $1.3 billion dividend, after reporting a 24% rise in annual net profit. It is a reminder that buybacks are not just a US phenomenon. ⁽⁴⁾
What determines whether a buyback works out for shareholders comes down to:
- Whether the company is buying shares below or above their long-term value
- Whether the cash used could have earned a higher return elsewhere in the business
- Whether the buyback is funded by real cash flow or by new debt
Understood alongside these questions, a buyback is less a signal to follow blindly and more a data point in a much larger picture of how a company is choosing to manage its capital.
