What is the parent company of Google called, established in 2015?

The parent company established above Google in 2015 is Alphabet Inc.

Google reorganized into Alphabet on October 2, 2015. Under the new structure, Google became the largest subsidiary, while separately managed businesses such as Calico, Verily, and Google Ventures could operate with greater independence.

The name Alphabet was chosen to represent a collection of letters and ideas rather than one single product. A common mix-up is treating Alphabet as a renamed version of Google; Google continued as a subsidiary and retained its major consumer services, including Search, YouTube, Android, and Maps. Alphabet’s corporate headquarters remain in Mountain View, California.