O'Reilly Automotive, Inc.

Market Cap calculates a company's market value. It answers: "How big is this company and what size risk am I taking?"

PEG Ratio measures if a stock is expensive relative to its growth rate. It answers: "Am I paying a fair price for growth?"

Trailing P/E shows what you are paying for each dollar of last year's earnings. It answers: "How expensive is this stock relative to its past year's profits?"

Forward P/E shows what you are paying for each dollar of next year's projected earnings. It answers: "How expensive is this stock relative to its expected future profits?"

Net Profit Margin (TTM) shows what percentage of revenue remains after all costs. It answers: "How much does the company keep as a final profit?"

Diluted EPS (TTM) shows the profit per share over the last 12 months. It answers: "How profitable is each share I buy?"