Glossary·Written by a CPA

Dilution

When a company issues more shares, so each existing share owns a smaller slice of the business.

Dilution is what happens when the total number of shares goes up, which basically just means your piece of the pie gets smaller even though you didn't sell anything. It's like a pizza that gets cut into 12 slices instead of 8... you still have one slice, but it's a smaller one.

New shares can come from a stock offering to raise cash, from stock-based compensation paid to employees, from convertible bonds turning into stock, or from using shares to pay for an acquisition.

For you, the easy check is the share count over time. If it keeps creeping up by a few percent every year, your ownership is shrinking, and earnings per share have to grow faster just to stand still.

Example. As an example, say a company has 100 million shares and you own 1 million, so you own 1%. If it issues 25 million new shares, there are now 125 million shares, and your 1 million shares are 1 million divided by 125 million, which is 0.8%.

The catch. Dilution isn't automatically bad if the cash raised earns a good return, but steady dilution that never seems to pay off is a real cost to shareholders.

Where I talk about it

Try it with your own numbers

Cheat sheet

Dilution cheat sheet: When a company issues more shares, so each existing share owns a smaller slice of the business.

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Related terms

Stock-based compensation Share buyback EPS Cash burn

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This is education, not tax or investment advice. I'm a CPA, but I'm not your CPA. Full disclaimer.