Why High ROE Can Be Misleading: Lessons from 200 US Companies

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A finance professional new to Python used a Kaggle dataset of pre-calculated financial ratios for the top 200 US companies to explore what profitability metrics really reveal. Sorting companies by Return on Equity (ROE) placed McKesson Corporation at the top, but the result proved deceptive. McKesson's aggressive stock buybacks have shrunk its shareholder equity over the years, artificially inflating its ROE figure rather than reflecting genuine business outperformance. Comparing ROE alongside current ratio and debt-to-equity data showed that the 'best' company changes entirely depending on which financial question is being asked. The analysis underscores that no single ratio tells the full story, and that context — especially capital structure — is essential to interpreting financial health accurately.

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