What Is a Stock Split?
A stock split increases the number of shares outstanding while proportionally reducing the share price. Your total investment value does not change immediately after the split.
A stock split is a corporate action in which a company divides its existing shares into multiple new shares. If you owned 10 shares of a company before a 10-for-1 split, you would own 100 shares after — but the price per share would be one-tenth of what it was.
How a stock split works
Imagine a stock trading at $1,200. The company announces a 10-for-1 split. On the effective date, every share becomes 10 shares, and the price adjusts to roughly $120. Your total dollar position is unchanged. Your broker updates your account automatically overnight — no action required.
What actually changes
- Share count: multiplied by the split ratio.
- Share price: divided by the split ratio.
- Market cap: unchanged.
- Ownership percentage: unchanged.
- Cost basis per share: adjusted for tax purposes.
Recent Examples
Why splits exist
Splits are mostly about accessibility and psychology. A $1,000 share price can feel intimidating to retail investors, even though a $100 share of a $500 billion company represents the same fractional ownership as a $1,000 share of the same company. Splits also help with employee stock grants, options liquidity, and — historically — inclusion in price-weighted indices like the Dow.
A split doesn't create value. It slices the pizza into more pieces. The pizza is the same size.
What a split doesn't change
A split does not change the underlying business, revenue, earnings, or intrinsic value of the company. It's a purely mechanical change to share structure. Any price movement around a split is driven by investor behavior and attention — not by the split itself.