Big four American companies

Goldman Sachs Group, Morgan Stanley, Merrill Lynch (now Bank of America Merrill Lynch), Citigroup.

1. Goldman Sachs Group: Founded in 1869, Goldman Sachs Group is one of the largest investment banks with a long history in the world, headquartered in new york, and ranked 47th in the Forbes Global Enterprise 2000 list on May 3, 2020.

2. Morgan Stanley: The financial industry, commonly known as "Morgan Stanley", is an international financial service company established in New York, USA, providing various financial services including securities, asset management, corporate mergers and acquisitions, credit cards and so on. It has representative offices in more than 600 cities in 27 countries around the world, with more than 60,000 employees.

Merrill Lynch: Merrill Lynch is one of the most famous securities retailers and investment banks in the world. Headquartered in new york, USA, it is one of the largest financial management consulting companies in the world.

4. Citigroup: 1955, Citibank of new york merged with the First Bank of new york, renamed as the First National City Bank of new york, with its headquarters in new york. 1998 merged with Traveler Group to form Citigroup, becoming the largest financial services company in the world.