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What Is a Stock Split? Forward & Reverse
Published Jun 16, 2026
What Is a Stock Split? Forward and Reverse Splits Explained
A stock split is a corporate action that changes the number of shares a company has outstanding while proportionally adjusting the price per share — leaving the total market capitalisation unchanged. If you own 100 shares at $150 each and the company executes a 2-for-1 split, you now hold 200 shares at $75 each. Your total value stays at $15,000.
Use the Stock Split Calculator to find your exact new share count and price for any split ratio.
Why Companies Split Their Stock
Forward splits (more common) are typically a sign of success:
- Affordability — a $1,500 share is less accessible to retail investors than a $150 share. Apple, Tesla, and Amazon have all split to make shares purchaseable in smaller dollar amounts.
- Liquidity — more shares and lower prices increase trading volume, which tightens bid-ask spreads.
- Index inclusion — some price-weighted indices (like the Dow Jones) have rules about share prices; splits can affect inclusion eligibility.
- Positive signal — companies typically split after strong price appreciation, so splits often follow strong performance.
Reverse splits (less common) usually happen when a company is in trouble:
- Shares have fallen to a very low price (e.g. below $1)
- The exchange (NYSE, NASDAQ) requires a minimum share price; a reverse split lifts the stock above the threshold
- Reducing share count can attract institutional investors who have policies against penny stocks
Common Split Ratios
| Ratio | Description | Effect on 100 shares at $150 |
|---|---|---|
| 2-for-1 | Forward split | 200 shares @ $75 |
| 3-for-1 | Forward split | 300 shares @ $50 |
| 5-for-1 | Forward split | 500 shares @ $30 |
| 10-for-1 | Forward split | 1,000 shares @ $15 |
| 1-for-10 | Reverse split | 10 shares @ $1,500 |
| 1-for-3 | Reverse split | ~33 shares @ $450 |
Does a Split Affect My Investment?
No — a split does not change your investment value. Splits are purely cosmetic. The company's total market cap, earnings, debt, and competitive position are all unchanged. You have more (or fewer) shares, each worth proportionally less (or more).
However, splits can have indirect effects:
- Increased retail participation can push prices up after a forward split (but this is a market sentiment effect, not a fundamental one)
- Reverse splits often accompany ongoing business deterioration — the split itself isn't the problem but it often signals one
- The stock may feel more "affordable" post-split and attract new buyers
Cost Basis After a Split
Your total cost basis is unchanged, but the per-share cost basis adjusts proportionally.
Example: You bought 100 shares at $100/share ($10,000 total). After a 2-for-1 split:
- You now own 200 shares
- Your per-share cost basis is $50 (not $100)
- Total cost basis is still $10,000
This matters for tax purposes. When you sell after a split, your capital gain is calculated against the adjusted per-share basis. Your brokerage typically handles this automatically.
Fractional Shares from Splits
When a split ratio doesn't divide evenly into your share count (e.g. a 3-for-2 split on 100 shares = 150 shares — fine), you get a clean number. But some splits create fractional shares. Companies handle fractions in two ways:
- Cash in lieu — the company pays cash for any fractional share (at market price)
- Round down — the fraction is simply dropped and no compensation is given (rare)
Historical Notable Splits
| Company | Year | Ratio | Pre-split price |
|---|---|---|---|
| Apple | 2020 | 4-for-1 | ~$500 |
| Tesla | 2020 | 5-for-1 | ~$2,200 |
| Amazon | 2022 | 20-for-1 | ~$2,400 |
| Alphabet (Google) | 2022 | 20-for-1 | ~$2,800 |
| Berkshire Hathaway B | 2010 | 50-for-1 | ~$3,475 |
Berkshire Hathaway A shares have never split — they trade above $600,000 per share.
Reverse Split Examples (Cautionary)
Reverse splits frequently precede further declines. They do not fix the underlying business problems that drove the share price down. Some historical examples:
- Companies facing delisting that reverse-split but continued declining
- Reverse splits in sectors with structural headwinds (retail, oil exploration)
If a company you own announces a reverse split, treat it as a prompt to review the fundamentals, not just the share count.
Use the Stock Split Calculator to verify your new position after any split, and the ROI Calculator to track your investment performance.