What Is a Stock Split? How It Works and Why Companies Do It

A stock split is when a company increases its number of shares by giving existing shareholders extra shares, which lowers the price of each share by the same proportion. In a 10-for-1 split, every share you own becomes ten, and a $1,000 stock starts trading at about $100. The total value of your holding and the company’s market value do not change.

So what is a stock split really for, if nothing of value changes? Mostly it is about making shares easier to trade and own, and sometimes about signaling confidence. The reverse version, where shares are combined to raise the price, is a different story and often a warning sign.

This guide explains how a stock split works, walks through a 10-for-1 example with real arithmetic, covers why companies split, what happens to options and dividends, and what famous splits at Apple, Nvidia and Tesla looked like. If you are new to shares, start with our guide to how the stock market works.

What is a stock split, in plain terms?

Think of a company’s value as a pizza. A stock split cuts the same pizza into more slices. You end up with more slices, each one smaller, but the same amount of pizza.

A split is described by a ratio. In a 2-for-1 split you get two shares for every one you held. In a 3-for-1 split you get three. In a 3-for-2 split you get three shares for every two, or 1.5 for each one. The share price is divided by the same ratio, so the total value stays the same.

Splits are decided by the company’s board of directors, and in some cases also need shareholder approval, for example when the company must increase the number of shares its charter authorizes. You do not need to do anything; your broker updates your account automatically.

How a stock split works: the key dates

A forward split follows a fixed timeline, set out in the company’s announcement:

1. Announcement date: The company says it will split and gives the ratio and dates.
2. Record date: Shareholders on the company’s books as of this date receive the extra shares.
3. Distribution date: The new shares are delivered, typically after the market closes.
4. Split-adjusted trading (ex-date): From the next trading session, the stock trades at the new, lower price, and your account shows the new share count.

If you buy shares between the record date and the ex-date, you are still entitled to the split shares; the exchange’s due-bill process makes sure they follow the shares you bought. In practice, you only need to watch for the first day of split-adjusted trading.

10-for-1 stock split example

Because the P/E ratio is unaffected, a split does not make a stock cheaper in any valuation sense. Our guide to the P/E ratio explains why price per share alone tells you nothing about value.

Why companies split their stock

If a split changes nothing fundamental, why bother? Companies usually give some combination of these reasons:

• Accessibility for smaller investors: A $1,000 share is hard to buy in small amounts if your broker does not offer fractional shares. A $100 share is easier.
• Employees: Lower share prices make stock grants and employee purchase plans easier to manage. Netflix cited employee stock options when it announced a 10-for-1 split in October 2025.
• Trading and options liquidity: A standard US options contract covers 100 shares, so on a $1,000 stock one contract controls $100,000 of stock. After a 10-for-1 split, it controls $10,000, which opens options trading to more investors.
• Index considerations: The Dow Jones Industrial Average is weighted by share price, so a very high-priced stock would dominate it. Apple’s 2020 split reduced its weight in the Dow, and Nvidia’s 2024 split preceded its addition to the index in November 2024.
• Signaling: Companies rarely split after their shares have fallen. A split often follows a long rise and can signal that management expects the business to keep doing well.

Fractional shares have weakened the first argument. Many US brokers now let you buy $10 of any large stock, which is one reason some companies with very high share prices have never split. Berkshire Hathaway’s Class A shares, for example, have never split.

Is a stock split good for investors?

A stock split is neutral in value terms: you own the same slice of the same company. But it is often read as a good sign because of what usually comes before it, namely strong performance and a confident board.

Academic research going back to the 1960s has found that share prices tend to rise around split announcements, largely because splits tend to follow good news about earnings or dividends. Whether split stocks keep outperforming afterward is much less clear, and any short-term bump can fade. More shares at a lower price can attract more small investors and options traders, which may increase trading activity, but that does not change what the business earns.

Reverse stock splits and why they are often a warning sign

A reverse stock split combines shares instead of dividing them. In a 1-for-10 reverse split, every 10 shares become 1, and a $0.60 stock starts trading at about $6. As with a forward split, the total value does not change on the day.

Why companies reverse split

• To keep an exchange listing: Nasdaq and the NYSE require listed stocks to stay above $1. On Nasdaq, a company that closes below $1 for 30 consecutive business days gets a deficiency notice and generally 180 days to fix it. A reverse split is the fastest fix.
• To meet institutional rules: Some funds and brokers will not hold or lend against stocks priced under $5.
• To shed the “penny stock” image and reduce the shares outstanding before raising new capital.

The problem is that the share price got that low for a reason. A reverse split does not fix losses, debt or dilution from repeated share sales. Studies have generally found that stocks tend to underperform after reverse splits on average, and many companies that do one later raise more money, diluting shareholders again, or end up doing a second reverse split. Nasdaq has tightened its rules in recent years to limit companies that rely on repeated reverse splits to stay listed. The SEC’s investor alerts also flag very large reverse splits as a possible red flag in small, thinly traded stocks.

There are exceptions. Large companies sometimes reverse split as part of a restructuring: Citigroup did a 1-for-10 reverse split in 2011 after the financial crisis, and General Electric did a 1-for-8 reverse split in 2021. Even then, the reverse split followed years of falling share prices.

What happens to options and dividends after a split?

Dividends

The dividend per share is divided by the split ratio, so your total dividend income stays the same. If a company paid $2.00 a quarter per share and does a 10-for-1 split, it pays $0.20 per share afterward; with 50 shares instead of 5, you still receive $10.00. Some companies combine a split with a dividend increase, as Nvidia did in 2024, when it raised its quarterly dividend from the split-adjusted equivalent of $0.004 to $0.01 per share. Our dividend investing guide covers how payouts work.

Options

Listed US options are adjusted by the Options Clearing Corporation (OCC) so that no one gains or loses from the split itself.

• Whole-number splits (2-for-1, 10-for-1): The number of contracts is multiplied and the strike price divided. One call with a $1,100 strike becomes 10 calls with a $110 strike, each still covering 100 shares. Before: 100 shares at $1,100 = $110,000 of exercise value. After: 10 × 100 × $110 = $110,000.
• Fractional splits (3-for-2): The contract count stays the same, the strike is divided by 1.5 and each contract covers 150 shares instead of 100. These adjusted contracts can be less liquid.
• Reverse splits: Contracts usually become non-standard, covering fewer shares, and often trade thinly. Check the OCC adjustment memo before trading them.

Taxes and charts

In the US, a stock split is generally not a taxable event; you simply spread your original cost basis over the new number of shares, as in the example above. Cash paid for fractional shares can be taxable. Price charts and historical data are adjusted for splits, so a past price of $1,000 may show as $100 on today’s chart. Keep that in mind when you read a stock chart that spans a split.

Famous stock split examples

Apple 4-for-1 (2020)

Apple announced a 4-for-1 split with its July 2020 earnings. Shareholders of record on August 24 received three extra shares for each one, and the stock began trading on a split-adjusted basis on August 31, 2020. It was Apple’s fifth split since its 1980 IPO, following a 7-for-1 split in 2014. One share bought at the IPO has become 224 shares (2 × 2 × 2 × 7 × 4).

Tesla 3-for-1 (2022)

Tesla shareholders approved a 3-for-1 split at the August 4, 2022 annual meeting. Holders of record on August 17 received two additional shares for each share, and split-adjusted trading began on August 25, 2022. It came two years after a 5-for-1 split in August 2020.

Nvidia 10-for-1 (2024)

Nvidia announced a 10-for-1 split on May 22, 2024. Shareholders of record on June 6 received nine extra shares for each one after the close on June 7, and the stock began split-adjusted trading on June 10, 2024. The pre-split price of roughly $1,209 became roughly $121. Nvidia had previously done a 4-for-1 split in July 2021.

Bottom line

A stock split changes the number of shares and the price per share, but not the value of the company or of your holding. Forward splits usually follow strong performance and make shares and options more accessible, while reverse splits usually follow a falling price and deserve a closer look at the company’s finances. Your dividends, options and cost basis are adjusted automatically. Base decisions on the business, not the split. For more, see our stocks and ETFs guides.

Sources

• Investor.gov (SEC) – Stock Split
• SEC – Stock Splits
• SEC EDGAR – NVIDIA Form 8-K, May 22, 2024 (ten-for-one stock split)
• Apple – Investor Relations FAQ (stock split history)
• IRS – Publication 550, Investment Income and Expenses