Formatting financial statements in commn size can eliminate inherent bias' that usually occurs whenever analyzing companies of differing sizes. Common size also allows for the analysis of a company over various time periods rapidly, e.g. revealing what percentage of sales is cost of goods sold and how that value has changed over time.
UnitedHealth Group Inc, https://www.unitedhealthgroup.com/, SIC Code: 6324, HOSPITAL AND MEDICAL SERVICE PLANS
View Financial Statements Report for UnitedHealth Group Inc