Key takeaways
- In a stock split, each share becomes several shares and the price adjusts in proportion; your total stake and the company's value are unchanged.
- In a two-for-one split, 100 shares at $100 become 200 shares at $50, and the dividend per share halves.
- A reverse split combines shares: in a one-for-ten reverse split, 10,000 shares become 1,000.
- Companies often split to make shares more affordable, and reverse split to raise a low share price, sometimes to keep an exchange listing.
- Per-share figures such as earnings per share and dividends per share are adjusted, so compare them on a split-adjusted basis.
A company announces a ten-for-one stock split and the share price drops from $500 to $50 overnight. Nothing went wrong. Splits change how a company's ownership is divided, not how much it is worth. Investor.gov defines a stock split as an increase in the number of shares of a corporation's stock without a change in the shareholders' equity, and that last phrase is the key to everything below.
How a split works
In an N-for-1 split, each share becomes N shares, and the price per share is divided by N.
Investor.gov's example: you own 100 shares trading at $100. The company declares a two-for-one split. Immediately afterwards you own 200 shares at $50. Your holding was worth $10,000 before and is worth $10,000 after.
| Split | Shares before → after | Price before → after | Holding value |
|---|---|---|---|
| 2-for-1 | 100 → 200 | $100 → $50 | $10,000 → $10,000 |
| 3-for-1 | 100 → 300 | $90 → $30 | $9,000 → $9,000 |
| 10-for-1 | 10 → 100 | $500 → $50 | $5,000 → $5,000 |
The company's market capitalisation, price times shares outstanding, is unchanged too, because both factors move in opposite directions by the same ratio. Investor.gov adds that, unlike issuing new shares, a split does not dilute existing shareholders: everyone's percentage ownership stays the same.
Why companies split
Investor.gov says companies often split their stock to make shares more affordable to investors. A share price in the hundreds or thousands of dollars can feel out of reach, even though nothing about the business has changed. Where a broker offers fractional shares, a high price is less of a barrier anyway.
The split itself creates no value. Any price move afterwards reflects how investors feel about the company, not the arithmetic of the split.
What else adjusts
Every per-share figure is divided by the split ratio:
- Dividends per share. Investor.gov notes that if the company pays a dividend, dividends per share fall proportionately. A $1 annual dividend becomes $0.50 per share after a two-for-one split, and your total dividend income is unchanged. See how dividends work.
- Earnings per share. Reported EPS is restated on the new share count, which is why historical figures are shown "split-adjusted". Earnings per share explains the figure.
- Historical prices. Charts may adjust past prices for splits, so an old $500 price appears as $50 after a ten-for-one split. If a chart shows a sudden cliff on the split date, it is unadjusted.
- Cost basis. Your cost per share is divided by the ratio for tax records; the total cost stays the same.
Reverse splits
A reverse split combines shares into fewer, higher-priced ones. Investor.gov's example: in a one-for-ten reverse split, every ten shares become one, so 10,000 shares become 1,000. The price rises roughly tenfold and the holding's value is unchanged at that moment.
Investor.gov gives the usual reasons: to increase the trading price, for example when the company believes the price is too low to attract investors, or to regain compliance with an exchange's minimum bid price requirement. That second reason is worth noticing: it means the share price had fallen low enough to put the listing at risk.
Investor.gov also notes:
- Cash-outs. In some reverse splits, small shareholders are cashed out, receiving cash instead of fractional shares, so they no longer own the stock.
- Where the rules come from. State corporate law and the company's own documents generally govern whether it can reverse split and whether shareholders must approve; reporting companies disclose it in filings such as Forms 8-K, 10-Q or 10-K, available on EDGAR. Depending on the facts, a company may also have to file a proxy statement on Schedule 14A if shareholder approval is required, or a Schedule 13E-3 if the reverse split will take the company private.
Reading split announcements
When a split is announced, check the ratio, the effective date and whether it is a forward or reverse split. Then remember the core point: the number of pieces changes, the size of the cake does not.
On a quote screen, a split shows up as a sudden change in the price and in per-share figures; how to read a stock quote explains those fields. To see how share counts and prices feed into a position's value, Learn to Trade Stocks Beginner lets you track positions with a virtual balance. It is part of our education app collection, and the investing basics hub has the related guides.
Good to know
Frequently asked questions
What is a stock split?
Does a stock split make the company more valuable?
Why do companies do reverse splits?
What happens to fractional shares in a reverse split?
Sources
- Stock Split (glossary) (opens in a new tab)Investor.gov, U.S. Securities and Exchange Commission — accessed
- Reverse Stock Splits (glossary) (opens in a new tab)Investor.gov, U.S. Securities and Exchange Commission — accessed
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