How a stock split works
When a company decides to split its stock, it will first issue a press release with key details of the split. For example, this will include the ratio of the stock split (how many shares you'll get for each one you own), as well as the effective date of the split, when the stock will begin trading on a split-adjusted basis.
On the effective date of a stock split, the share price will be proportionately reduced, but the additional shares will appear in investors' accounts. If the company completes a 10-for-1 stock split, like Nvidia did in 2024, and you owned 20 shares worth $100 each prior to the split, you would now own 200 shares worth $10 each.