Westin belongs to the Marriott Group. In 2016, the Starwood Hotel Group was successfully acquired by Marriott and is now part of the Marriott Group.

The main brands of Starwood International Hotel Group: St. Regis, Supreme Collection, Sheraton, Westin, Four Points and W Hotels, and Beauty Hall.

Starwood Group is one of the world's largest hotel and entertainment groups.

In 1998, Starwood acquired Westin Hotels & Resorts Worldwide and several of its subsidiaries, as well as American International Telephone and Telegraph Company, which was named Sheraton Holdings.

In October 1999, it acquired Vistana Co., Ltd., which made Starwood Group the leader among many hotel and entertainment groups.

Starwood Group, through its subsidiaries, directly and indirectly manages hotel, entertainment and leisure businesses.