Dictionary › Dilution & financing
Dilution
Also called: share dilution, equity dilution, stock dilution
The shrinking of each existing shareholder’s ownership stake when a company issues new shares.
Explanation
When a company issues new shares, every existing share represents a smaller slice of the business. If a company with 10 million shares sells 5 million more, a holder of 1 million shares goes from owning 10% to about 6.7%, and from then on each share gets a smaller cut of future earnings, assets and votes.
New shares come from many places: offerings for cash (ATM programs, follow-ons, registered directs, PIPEs), conversions of convertible notes and preferred stock, exercises of warrants and options, vesting of employee stock awards, and stock issued to pay for acquisitions.
Ownership dilution is not automatically value destruction. Shares sold at a fair price bring in cash worth what was given up, and the money can fund growth. The damage comes when shares are sold well below what they are worth, again and again, to cover operating losses: holders then own a shrinking piece of a business that keeps needing more money.
Why it matters
For loss-making small caps, dilution is often the biggest single driver of long-run returns. A company can succeed operationally while its share price falls, because the share count grew several times over.
How Equity Dictionary measures it
The Dilution tab charts shares outstanding restated for stock splits, so a reverse split cannot hide earlier issuance. The historical-dilution factor (15% of the score) maps year-over-year share growth to 0 at no growth, 55 at +25%, 75 at +50% and 100 at +200%. Growth from a stock-for-stock merger is named in the summary but still counts. The screener ranks every listed filer by diluted weighted-average share growth versus a year earlier.
Related terms
- Dilution-risk score: Equity Dictionary’s 0–100 estimate of how much pressure a company is under to issue new stock, built from eight weighted factors.
- At-the-market offering (ATM): A program that lets a company sell new shares a little at a time directly into the market at prevailing prices, through a broker acting as its sales agent.
- Warrants: Contracts issued by a company that let the holder buy new shares at a fixed exercise price until an expiry date, often five years out.
- Overhang: Shares that could be added to the market from warrants, options, convertibles and unvested stock awards, which tends to weigh on the share price.
- Reverse stock split: Combining existing shares into fewer, higher-priced ones, for example 1-for-10, usually to lift the share price back above an exchange minimum.
- Authorized shares: The maximum number of shares a company’s charter allows it to issue; issuing more requires shareholders to approve a charter amendment.
Plain-English summary for research; not legal or investment advice.