RIO vs CAT

For growth investors, Caterpillar Inc.

(CAT) is the stronger pick with 4. 3% revenue growth year-over-year, versus -0. 7% for Rio Tinto Group (RIO). Rio Tinto Group (RIO) offers the better valuation at 14. 2x trailing P/E (12. 3x forward), making it the more compelling value choice. Analysts rate Caterpillar Inc. (CAT) a "Buy" — based on 53 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On trailing P/E, Rio Tinto Group (RIO) is the cheapest at 14.

2x versus Caterpillar Inc. at 48. 0x. On forward P/E, Rio Tinto Group is actually cheaper at 12. 3x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Caterpillar Inc. wins at 1. 39x versus Rio Tinto Group's 1. 60x — a reasonable growth-adjusted valuation.

Over the past 5 years, Caterpillar Inc.

(CAT) delivered a total return of +291. 3%, compared to +41. 8% for Rio Tinto Group (RIO). Over 10 years, the gap is even starker: CAT returned +1203% versus RIO's +386. 2%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), Rio Tinto Group (RIO) is the lower-risk stock at 0.

98β versus Caterpillar Inc. 's 1. 54β — meaning CAT is approximately 58% more volatile than RIO relative to the S&P 500. On balance sheet safety, Rio Tinto Group (RIO) carries a lower debt/equity ratio of 24% versus 2% for Caterpillar Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Caterpillar Inc.

(CAT) is pulling ahead at 4. 3% versus -0. 7% for Rio Tinto Group (RIO). On earnings-per-share growth, the picture is similar: Rio Tinto Group grew EPS 14. 8% year-over-year, compared to -14. 6% for Caterpillar Inc.. Over a 3-year CAGR, CAT leads at 4. 4% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

Rio Tinto Group (RIO) is the more profitable company, earning 21.

5% net margin versus 13. 1% for Caterpillar Inc. — meaning it keeps 21. 5% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: RIO leads at 29. 2% versus 16. 6% for CAT. At the gross margin level — before operating expenses — RIO leads at 56. 4%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, Caterpillar Inc. (CAT) is the more undervalued stock at a PEG of 1. 39x versus Rio Tinto Group's 1. 60x. A PEG below 1. 5 suggests fair-to-attractive pricing relative to expected growth. On forward earnings alone, Rio Tinto Group (RIO) trades at 12. 3x forward P/E versus 39. 2x for Caterpillar Inc. — 26. 9x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for RIO: 1. 2% to $101. 75.

All stocks in this comparison pay dividends.

Rio Tinto Group (RIO) offers the highest yield at 4. 3%, versus 0. 6% for Caterpillar Inc. (CAT).

For long-horizon retirement investors, Caterpillar Inc.

(CAT) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (0. 6% yield, +1203% 10Y return). Both have compounded well over 10 years (CAT: +1203%, RIO: +386. 2%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

These companies operate in different sectors (RIO (Basic Materials) and CAT (Industrials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: RIO is a large-cap deep-value stock; CAT is a large-cap quality compounder stock. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.