Alphabet is the parent company of Google. The list of its subsidiaries also includes Jigsaw, Sidewalk Labs, X. As its holding company, Alphabet has interest in all Google segments, such as Google Search, YouTube, Chrome and many others. Another part of the company's revenue comes from advertising, digital sales, apps and cloud services that Google delivers and maintains. Alphabet shares are traded on the NASDAQ stock exchange with the ticker symbol GOOGL. Being a parent company of Google, Alphabet automatically constitutes the main market indices that its famous subsidiary does: the NASDAQ-100 index, the S&P 100 and the S&P 500.