#4 United Health Group

Company Name	UnitedHealth Group Incorporated
Founded	1977 (as United Healthcare Corporation)
Founder(s)	Richard T. Burke
Headquarters	Minnetonka, Minnesota, USA
CEO	Andrew Witty (as of 2021)
Industry	Health Insurance, Healthcare Services
Primary Services	Health Insurance (UnitedHealthcare), Healthcare Services (Optum)
Market Cap (2023)	~$500 billion (subject to fluctuation)
Revenue (2023)	$400 billion (approx.)
Employees	Over 400,000 (as of 2023)
Stock Ticker	UNH (NYSE)
Notable Acquisitions	Optum (healthcare services), Catamaran, Davita Medical Group, Change Healthcare
Global Reach	Operates in the U.S. and internationally, with a large presence in health services
Key Competitors	Anthem, Aetna (CVS Health), Cigna, Humana, Molina Healthcare

1977	UnitedHealth Group is founded by Richard T. Burke as United Healthcare Corporation in Minnetonka, Minnesota. The company begins as a healthcare services provider and insurance company.
1984	UnitedHealth goes public: The company is listed on the New York Stock Exchange under the ticker UNH.
1991	UnitedHealth expands into healthcare services: The company starts offering healthcare services through its Optum division, which later becomes a key part of its business model.
1997	UnitedHealth merges with MetraHealth: The merger forms UnitedHealth Group, becoming a major player in health insurance and managed care.
2000	UnitedHealth launches Optum: The company creates Optum as a health services platform, initially focusing on pharmacy care services.
2002	UnitedHealth acquires Prescription Solutions: UnitedHealth expands its pharmacy services, a key component of Optum.
2004	UnitedHealth expands globally: The company begins offering international healthcare services, marking its global expansion.
2006	UnitedHealth acquires the health services company, Evercare: UnitedHealth adds long-term care and other healthcare services to its portfolio.
2011	OptumHealth launches: OptumHealth becomes a central part of the company's service offerings, providing healthcare management, technology, and consulting services.
2013	UnitedHealth acquires Catamaran: The company expands its pharmacy benefit management (PBM) capabilities with the acquisition of Catamaran.
2015	UnitedHealth begins focusing on value-based care: The company refines its business model to focus more on healthcare outcomes and cost-efficiency.
2017	UnitedHealth reaches $200 billion in revenue: The company achieves a major milestone in revenue growth, driven by both its health insurance and healthcare services divisions.
2018	UnitedHealth acquires DaVita Medical Group: The acquisition enhances Optum's capabilities in providing healthcare delivery and physician services.
2021	Andrew Witty becomes CEO: Witty succeeds Stephen Hemsley as CEO, marking a leadership change at the company.
2023	UnitedHealth continues global expansion and healthcare innovation: The company focuses on expanding its health services through Optum, as well as advancing its digital health technologies.