Dilution

What it means

Dilution happens when a company issues new shares, shrinking each existing shareholder's percentage of ownership. If you own 1,000 of a company's 1 million shares and it issues 250,000 more, your slice of the company gets smaller even though your share count is unchanged. Your voting power and your claim on future earnings are both spread thinner.

Dilution also hits per-share metrics directly. The same pool of earnings divided by more shares means lower earnings per share, which is why markets often punish stocks when new issuance is announced. Dilution occurs through secondary offerings, the exercise of employee stock options and restricted stock units, and the conversion of convertible bonds into shares.

Not all dilution is bad. If a company issues shares to fund a genuinely profitable expansion or to pay down expensive debt, the smaller slice can be worth more than the larger slice was. Stock buybacks work in reverse, shrinking the share count and concentrating ownership, which is why investors watch net share count over time rather than any single issuance.

An example

For illustration, you own 10% of a company with 1 million shares outstanding. After it issues 250,000 new shares to raise capital, 1.25 million shares exist and your stake is now 8%, with earnings per share spread across the larger base.

Related terms

Earnings per share (EPS), Stock buyback, IPO, Direct listing