John Murray
Great reminder that an authorization is permission, not a promise, so a buyback headline is just one piece of the picture. If you're new to this, try jotting down what a company says it may do versus what it has actually done.
What is a stock buyback, and why do companies announce them alongside earnings?
Discussion
A buyback, also called a share repurchase, is when a company uses its own cash to buy back its own shares from the market. With fewer shares left, each remaining share stands for a slightly bigger slice of the company, and the same profit gets divided across fewer shares, so earnings per share can rise even if total profit doesn't. Buybacks and dividends are the two main ways companies hand cash back to shareholders.
Several companies announced buybacks with their results on Oct 29. Dexcom's board approved a program of up to $1.0 billion running through the end of 2027. Republic Services approved $5 billion for 2027 through 2029, and said it had already spent $197 million buying back 0.9 million shares in the third quarter. One important detail is that an "authorization" is permission, not a promise. Dexcom's own filing says the program doesn't oblige it to buy any amount and can be changed or stopped at any time. U.S. rules (the SEC's Rule 10b-18) also set limits on how, when, at what price and in what size a company can buy its own stock each day.
A buyback headline doesn't tell you whether the company is paying a good price for its shares, or whether that cash would have been better spent on the business. It's one piece of the picture, not a signal by itself. Got a question about buybacks, dividends or earnings per share? Ask below. There are no silly questions here.
Sources: Dexcom Form 8-K (Oct 29, 2026); Republic Services Q3 2026 results release (Oct 29, 2026); SEC Rule 10b-18 (eCFR) and SEC Division of Trading and Markets Rule 10b-18 FAQ.