A 20-for-1 stock split means that for each individual share that a shareholder owns, they will be issued an additional 19 shares, so that share’s original value is now split among 20 shares. For example, someone owns 1 stock of a company valued at $1,000. The company decides to do a 20-for-1 stock split. After the stock split, that person will own 20 shares of the company worth $50 each. There is no change in the value of the position.