The Blackstone Group Inc. is a multinational private equity alternative investment management and financial services firm based in Midtown Manhattan, New York City. As the largest alternative investment firm in the world founded in 1985, Blackstone specializes in private equity, credit, and hedge fund investment strategies. 

Blackstone's private equity business has been one of the largest investors in leveraged buyouts in the last decade, while its real estate business has actively acquired commercial real estate. 

Since its inception, Blackstone has invested in such notable companies as Hilton Worldwide, Merlin Entertainments Group, Performance Food Group, EQ Office, Republic Services, AlliedBarton, United Biscuits, Freescale Semiconductor, Vivint, and Travelport.

As of 2019, Blackstone was the world's largest private equity firm by capital commitments as ranked by Private Equity International. The firm invests through minority investments, corporate partnerships, and industry consolidations, and occasionally, start-up investments. The firm focuses on friendly investments in large capitalization companies.

As of 2019, the company's total assets under management were approximately US$545 billion dollars. 

According to en.wikipedia