How does a stock split work?

Think of the company as a pizza. A split cuts the same pizza into more slices: each slice is smaller, but the pizza is no bigger and your share of it does not change. That is the drawing at the top of the page.

Hypothetical 2-for-1 split: you own 100 shares at $100, worth $10,000. After the split you own 200 shares and the stock trades around $50: still $10,000. In a 3-for-1 split, the same 100 shares would become 300 at about $33.33.

The company announces the ratio and the dates in advance. From the effective date the stock trades at the new price, and your broker adds the shares automatically and adjusts your cost per share; your total cost stays the same. Earnings per share and the dividend per share are restated on the new share count too, so ratios such as the P/E ratio do not change.

Split ratio
New shares for old ones. 2-for-1 doubles the share count and halves the price; 1-for-10 (a reverse split) divides the share count by 10 and multiplies the price by 10.
Forward split
A split that increases the number of shares and lowers the price per share, such as 2-for-1 or 3-for-1.
Reverse split
A split that merges shares, reducing their number and raising the price per share, such as 1-for-10.

Why do companies split their stock?

A split changes nothing about the business, its profits or its value. Companies usually split after a long rise has pushed the share price high, for reasons like these:

  • A lower price per share can make the stock feel more affordable to individual investors, especially where fractional shares are not offered.
  • Options get cheaper: one standard US option covers 100 shares, so a lower share price lowers the cost of each contract; see options trading for beginners.
  • Price-weighted indexes such as the Dow Jones Industrial Average give higher-priced stocks more weight, so a split reduces a company’s weight there; see stock market indexes.
  • It shows the board’s confidence after a strong run, but a split is not a forecast. Buying a stock only because it will split is a bet on a story, not on the business.

What is a reverse stock split?

A reverse split merges several shares into one. In a 1-for-10 reverse split, every 10 shares become 1 and the price is multiplied by 10. Hypothetical: you own 1,000 shares at $0.80, worth $800. After the split you own 100 shares at about $8.00, still $800.

Reverse splits are often a warning sign. Many come after a long decline, when a company needs to lift its price back above $1, the minimum both Nasdaq and the NYSE require to stay listed. The split fixes the price, not the business: if the losses continue, the new, higher price can keep falling. Both exchanges have tightened their rules for companies that rely on reverse splits repeatedly.

If your shares do not divide evenly, you usually receive cash for the leftover fraction (cash in lieu). Some reverse splits have neutral reasons, such as a merger or a change of share class, so read the reason in the company’s announcement.

Turn your phone sideways to read the drawing. Tap to close.

A hand-drawn 1-for-10 reverse split: ten small boxes worth $0.80 each merge into one big box worth $8.00, with 1,000 × $0.80 = $800 becoming 100 × $8.00 = $800, and a red warning: often after a long decline, for example to stay above the $1 listing minimum.

Why your chart does not show a crash after a split

On the first trading day after a 3-for-1 split, a $300 stock trades around $100. A chart of raw prices would show a 67% plunge that cost nobody anything. So charting platforms and data providers adjust past prices for splits: every earlier price is divided by 3, and the history lines up with today’s price.

Keep this in mind when you compare old prices. A stock that “traded at $100 ten years ago” on today’s chart may have traded at a very different price at the time. For chart basics, see how to read stock charts.

Turn your phone sideways to read the drawing. Tap to close.

Two hand-drawn panels of the same stock: on the left, raw prices fall from about $300 to about $100 on the 3-for-1 split day, labeled not a crash; on the right, the split-adjusted chart divides the history by 3 so the line runs smoothly from about $90 to $108, with the note: charts divide past prices by 3.

What happens to options and open orders after a split?

Listed options are adjusted by the Options Clearing Corporation (OCC) so the contracts keep their value. After a 2-for-1 split, one call with a $200 strike usually becomes two calls with a $100 strike, each still covering 100 shares. Uneven ratios, such as 3-for-2, are usually handled by changing the number of shares each contract delivers instead, and such adjusted contracts can trade less actively.

Open orders can be affected too: many brokers cancel or adjust good-’til-canceled limit and stop orders around a split, so check your orders after the effective date.

Turn your phone sideways to read the drawing. Tap to close.

A hand-drawn call contract card before the split (strike $200, 100 shares) with arrows marked 2:1 to two call cards after it (strike $100, 100 shares each), the note same total value, and the line 100 × $200 = 2 × 100 × $100 = $20,000.

Stock split vs stock dividend

A stock dividend pays shareholders in extra shares instead of cash, for example 5 new shares for every 100 held (a 5% stock dividend). Like a split, it adds shares without adding value: the price adjusts down in about the same proportion. The differences are size and accounting. Stock dividends are usually small percentages, splits are usually whole ratios, and companies book them differently; some even carry out a split in the form of a stock dividend.

Neither should change your decision to own the stock. What matters is the business and the price you pay for it; see valuation ratios. For cash dividends, see how dividends work.