Today, Google becomes Alphabet. Well, Google still exists, but Alphabet is the parent company, and Google is under that.
As you probably know, Google announced a new corporate structure, which included the birth of Alphabet, back in August. Larry Page becomes CEO of Alphabet, and Sundar Pichai becomes CEO of Google. Co-founder Sergey Brin is Alphabet's President. The co-founders will oversee all of the companies under Alphabet, including Google, Fiber, Calico, Google Ventures, Google Capital, Google X, Life Sciences, and Nest. Most of Google's well-known products (YouTube, Android, Gmail, etc. will remain under Google.
Google announced today on its Investor Relations site:
Google Inc. announced today that, pursuant to its previously announced plans to create a new public holding company, Alphabet Inc. (“Alphabet”), by implementing a holding company reorganization (the “Alphabet Merger”), it expects that the Alphabet Merger will close after the close of business on October 2, 2015. Google anticipates that shares of Google Class C Capital Stock and shares of Google Class A Common Stock will begin trading as Alphabet Class C Capital Stock and Alphabet Class A Common Stock, respectively, on the NASDAQ Global Select Market on October 5, 2015. Shares of Alphabet Class C Capital Stock and shares of Alphabet Class A Common Stock will continue to be traded under the same ticker symbols under GOOG and GOOGL, respectively.