In many cases, a company will split a stock 2-for-1 or 3-for-1. In a 2-for-1 split, a share of stock worth $100 will be split into two shares worth $50 each. Each shareholder would have double the number of shares, each worth half the price of a pre-split share. A 20-for-1 stock split, as Amazon has done, is rare.
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