A stock split increases the number of shares in issue and cuts the price of each one in the same proportion. A two-for-one split gives every shareholder two shares for each one they held, and the price falls by about half. The company's market value is the same before and after, because nothing about the business has changed. Only the number of pieces has changed.
Splits are common, and they confuse many people. A lower price can look like a bargain, and a chart can show a drop that is not a real loss. This guide explains how splits work, how to read them on a chart, and why the price after a split tells you very little on its own.
How a split works
Suppose a company has 10 million shares at 100 each. Its market cap is 1 billion. It announces a two-for-one split. After the split it has 20 million shares. Each shareholder who held 100 shares now holds 200. The price falls to about 50, and the market cap stays at 1 billion.
Your holding is worth the same before and after. If you held 100 shares at 100, your position was worth 10,000. After the split you hold 200 shares at 50, which is still 10,000. Nothing has been gained or lost.
A split can be in any ratio. A three-for-one split, a five-for-one split and an unusual ratio such as three-for-two are all possible. The arithmetic is the same: the share count is multiplied by the ratio and the price is divided by it.
A reverse split
A reverse split does the opposite. A one-for-ten reverse split gives shareholders one share for every ten they held, and the price rises tenfold. Companies use reverse splits to lift a share price that has fallen very low, often to meet a minimum price rule for a market. A reverse split does not change the company's value either.
Reverse splits sometimes come before a company's problems are fixed, and the lower share count can make a small company harder to trade. Read the reason for a reverse split before you treat the higher price as a sign of strength.
What a split does to a chart
Most price charts adjust past prices for splits, so the history lines up. Some charts do not, and they show a sudden drop on the day of the split. That drop is not a loss. It is a change in the number of pieces.
Check whether a chart is split-adjusted before you read a fall as a real move. An unadjusted chart can make a stock look as though it halved in a day, when the shareholders' value did not change at all. This is one of the most common reasons for a false alarm.
The myths about splits
A split makes a stock cheaper. The price is lower, but the value per share and the market cap are the same. A stock that trades at 50 after a split is no cheaper than one that traded at 100 before it, in terms of the company's value.
A split means the company is doing well. Splits often follow a rise in the share price, and companies sometimes split to make the shares look more affordable. A split is a cosmetic change. It can accompany a strong business, but it is not evidence of one.
A split always leads to a rise. There is research suggesting that some stocks rise after a split, but the effect is small, inconsistent and hard to rely on. Many stocks do not rise, and some fall. Treat a split as a neutral event unless you have other reasons.
The more shares you own, the richer you are. Owning 200 shares at 50 is the same as owning 100 shares at 100. The number of shares is not the measure of value. Value is the number of shares multiplied by the price.
A worked example
Suppose you hold 150 shares at 80, so your position is worth 12,000. The company announces a three-for-one split. You now hold 450 shares at about 26.67. The position is still worth about 12,000.
If the share then rises to 30 after the split, your position is worth 13,500, a gain of 12.5 percent on the value after the split. The gain comes from the price move, not from the split. The split itself changed nothing.
| Stage | Shares | Price | Value |
|---|---|---|---|
| Before split | 150 | 80 | 12,000 |
| After split (3-for-1) | 450 | 26.67 | 12,000 |
| Later, price rises | 450 | 30 | 13,500 |
Why companies split
Companies usually give a few reasons for a split. The most common is to bring the share price into a range that more investors can buy, especially those who buy in small amounts. Some companies also want the share price to look more comparable with its peers, although the market does not value shares by their price.
For a company already priced high, a split can make it easier for employees who hold shares to trade them in small lots. None of these reasons change the company's value. Read the stated reason and the company's own commentary, and do not assume more than they say.
How splits affect indexes
A split changes the share count and price together, so a market-cap-weighted index is unaffected: the company's market value is the same before and after. A price-weighted index is different. If it simply averaged the prices, a split would cut the company's weight in the index, even though its value had not changed. Price-weighted indexes therefore use a divisor that is adjusted when a split happens, so the index level does not jump.
When you read an index's history, check whether the level is adjusted for splits and other corporate actions. An unadjusted index history can show a fall that was caused entirely by a company splitting its shares.
Fractional shares
Some brokers allow you to hold fractions of a share, and many markets require whole shares only. After a split, an odd number of shares can leave you with a fraction. Check how your broker and the market handle fractional entitlements, so you know how much you will receive and in what form.
Checklist
- When a split is announced, note the ratio, the record date and the effective date.
- Check that your chart is split-adjusted before you read a price fall.
- Check that your position value is the same before and after the split.
- Read the stated reason for the split, and check whether a reverse split is involved.
- Judge the company on its business and the price move after the split, not on the lower price itself.
Key takeaways
A stock split changes the number of shares and their price in the same proportion, so the company's market value and your position's value stay the same. A lower price after a split does not make a stock cheaper, and a chart that is not split-adjusted can show a false fall. Reverse splits do the opposite and carry their own signals. Judge a split by what it means for the business and the price move that follows, not by the new price on the screen.
This guide is for general information, not financial advice. See the disclaimer.