One share of stock represents a single fractional unit of corporate ownership in a publicly traded company, and its monetary cost varies entirely depending on the specific corporation's valuation and share price. For example, a single share of a company might cost ten dollars, while another tech giant's share could cost hundreds or thousands of dollars. Thanks to modern fractional share investing offered by online brokerages, investors do not need to buy a full single share, allowing them to purchase portions of a stock with small dollar amounts.