Definition
In a 2-for-1 split, every shareholder receives one additional share for each share owned; the stock price is halved simultaneously. Fundamentals (revenue, earnings, market cap) are unchanged — only the numbers on paper. Companies typically split when the share price rises to levels that make round-lot ($100-share increments) purchases unaffordable to retail investors. Tesla did a 3-for-1 in 2022 (from ~$900 to ~$300); NVIDIA did a 10-for-1 in June 2024. Some research suggests splits historically produce modest post-split outperformance, possibly due to increased retail accessibility and improved options-market liquidity — though the effect is small and inconsistent. Reverse splits (e.g., 1-for-10) go the opposite direction — usually a warning sign, as they're often used to avoid delisting after prolonged price declines.
Example
NVIDIA announced a 10-for-1 split in May 2024. Pre-split: ~$1,200/share, 2.5B shares outstanding. Post-split: ~$120/share, 25B shares outstanding. Market cap unchanged at ~$3T. A shareholder with 10 shares before now has 100 shares.
Frequently Asked Questions
Does a stock split make me richer?
No — your total position value is unchanged. If you had $10,000 in AAPL before a 4-for-1 split, you have $10,000 after. Just more shares at a lower price each.
Why do companies split their stock?
Historically to make the share price more accessible to retail investors (round lots of 100 shares fit smaller accounts) and improve options market liquidity. With fractional shares now widely available, the accessibility argument is weaker.
What is a reverse split?
The opposite: 10 shares consolidated into 1 (a 1-for-10 reverse split). Used to raise share price, often to maintain listing requirements when a stock has dropped below $1. Usually a bearish signal about the company's health.