Investing term
What is Dilution?
Your ownership percentage shrinks because the company issued more shares.
Dilution is the shrinking of your ownership percentage when a company issues new shares. The pie gets cut into more slices, so each existing slice — including yours — is smaller, and your claim on future earnings drops unless the new cash creates enough value to make up for it.
Companies issue new shares for many reasons: to raise capital, to pay staff in stock, or to fund acquisitions. Some dilution is healthy if the money raised generates strong returns. But heavy, repeated dilution is a quiet way shareholders get poorer even when a company looks like it's growing — revenue and headline value rise while each share's slice of them steadily shrinks. Watching share-count growth alongside revenue growth reveals whether existing holders are actually benefiting.
Issue 25% more shares and a 10% stake becomes about 8% — a smaller slice of the same pie, without you selling a thing. Heavy dilution erodes owners even as revenue grows.
For example
You own 10% of a company that issues 25% more shares; your stake falls to about 8% — a smaller slice of the same pie, without you selling a thing.
Learn it by doing
That's Dilution in theory — it clicks when you use it. Practise it hands-on in a free, interactive lesson (Stage 8, Corporate Actions: What Lands in Your Account).
Try the free lesson →Why it matters to you
Dilution matters because it can erode your real ownership even as a company appears to be thriving. Per-share metrics — earnings per share, your ownership percentage — are what actually determine your wealth, and heavy share issuance drags them down regardless of how fast total revenue grows. Checking whether a company's share count is quietly ballooning is a key way to tell whether growth is genuinely reaching shareholders or being offset by an ever-expanding share base.
⚠ Watching total growth, not per-share growth
A company can grow its revenue and total profit impressively while issuing so many new shares that earnings per share barely move — leaving shareholders no better off. Focusing on headline growth and ignoring the rising share count hides this dilution. Always check per-share figures, which reflect what you actually own, not just the company's overall size.