[15] In December 2004, Hyatt Hotels Corporation acquired AmeriSuites, an upscale chain of all-suite business class hotels from affiliates of the Blackstone Group, a New York-based private equity investment firm.

In December 2005, Hyatt acquired limited service company Summerfield Suites from the Blackstone Group.

In August 2009, it was reported that Hyatt Hotels Corporation filed plans to raise up to $1.15 billion in an initial share sale.

That November Hyatt completed an initial public offering and began trading publicly on the New York Stock Exchange under the symbol H.[19] According to the filing Mark S. Hoplamazian was to serve as CEO and Thomas Pritzker as Executive Chairman.

[20] The public offering was a result of the acrimonious breakup of the Pritzker family empire.

On October 28, 2015, Hyatt announced that they were in advanced talks to acquire Starwood Hotels in a cash and stock transaction.

[25] In August 2021, Hyatt acquired Apple Leisure Group (ALG), a luxury resort-management services, travel and hospitality group, from affiliates of Kohlberg Kravis Roberts and KSL Capital Partners for $2.7 billion in cash.

[27] In April 2023, Hyatt acquired Mr and Mrs Smith, a UK-based platform offering direct booking access to over 1,500 boutique and luxury properties worldwide for £53.0 million in cash consideration.

[29] In August 2024, Hyatt announced the planned acquisition of Standard International, an upscale boutique hotel operator, for $150 million, with up to an additional $185 million over time as additional properties enter the portfolio.

[30] That same month, Hyatt Regency Orlando, one of the region’s largest convention hotels, was sold for $1.02 billion to Los Angeles-based Ares Management and Houston-based Rida Development — the nation's highest hotel sale in 2024.

Since then, Hyatt has added a wide range of other brands either through organic growth or via a series of acquisitions, especially in the lifestyle and resort segments.

Following the acquisition of Standard Hotels announced in August 2024, Hyatt will form a dedicated lifestyle group led by Standard International's Executive Chairman Amar Lalvani overseeing all lifestyle hotel operations.

Brands include: In 2013, Hyatt partnered with MGM Resorts International in bringing 12 MGM properties in Las Vegas to Hyatt booking channels, as well as in-depth collaborations with each other's loyalty program.

[57] The partnership has since ceased in 2024 following Hyatt's acquisition of Mr & Mrs Smith, a direct booking platform of luxury hotels.

[59] This program includes membership tiers of base members, Discoverists, Explorists, and Globalists.

[60] Fortune magazine ranked Hyatt #32 on its list of "America's Best Companies to Work For" in 2019,[61] rising to #16 in 2021.