ATI vs STLD vs NUE vs RS

For growth investors, Nucor Corporation (NUE) is the stronger pick with 5.

7% revenue growth year-over-year, versus 3. 3% for Reliance Steel & Aluminum Co. (RS). Reliance Steel & Aluminum Co. (RS) offers the better valuation at 26. 4x trailing P/E (18. 9x forward), making it the more compelling value choice. Analysts rate ATI Inc. (ATI) a "Buy" — based on 29 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, Reliance Steel & Aluminum Co.

(RS) is the cheapest at 26. 4x versus ATI Inc. at 57. 0x. On forward P/E, Steel Dynamics, Inc. is actually cheaper at 15. 6x — notably different from the trailing picture, reflecting expected earnings growth. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Steel Dynamics, Inc. wins at 0. 62x versus Reliance Steel & Aluminum Co. 's 0. 96x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, ATI Inc.

(ATI) delivered a total return of +572. 7%, compared to +119. 6% for Reliance Steel & Aluminum Co. (RS). Over 10 years, the gap is even starker: ATI returned +1050% versus NUE's +426. 7%. 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), Reliance Steel & Aluminum Co.

(RS) is the lower-risk stock at 0. 75β versus ATI Inc. 's 1. 51β — meaning ATI is approximately 103% more volatile than RS relative to the S&P 500. On balance sheet safety, Reliance Steel & Aluminum Co. (RS) carries a lower debt/equity ratio of 28% versus 102% for ATI Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Nucor Corporation (NUE) is pulling ahead at 5.

7% versus 3. 3% for Reliance Steel & Aluminum Co. (RS). On earnings-per-share growth, the picture is similar: ATI Inc. grew EPS 11. 8% year-over-year, compared to -18. 8% for Steel Dynamics, Inc.. Over a 3-year CAGR, ATI leads at 6. 1% 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.

ATI Inc.

(ATI) is the more profitable company, earning 8. 8% net margin versus 5. 2% for Reliance Steel & Aluminum Co. — meaning it keeps 8. 8% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ATI leads at 13. 8% versus 7. 2% for RS. At the gross margin level — before operating expenses — RS leads at 26. 8%, 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, Steel Dynamics, Inc. (STLD) is the more undervalued stock at a PEG of 0. 62x versus Reliance Steel & Aluminum Co. 's 0. 96x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Steel Dynamics, Inc. (STLD) trades at 15. 6x forward P/E versus 37. 9x for ATI Inc. — 22. 3x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ATI: 6. 6% to $173. 40.

In this comparison, RS (1.

3% yield), NUE (1. 0% yield), STLD (0. 8% yield) pay a dividend. ATI does not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Reliance Steel & Aluminum Co.

(RS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 75), 1. 3% yield, +463. 7% 10Y return). ATI Inc. (ATI) carries a higher beta of 1. 51 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (RS: +463. 7%, ATI: +1050%), 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 (ATI (Industrials) and STLD (Basic Materials) and NUE (Basic Materials) and RS (Basic Materials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

STLD, NUE, RS pay a dividend while ATI does not, making them suitable for different income and tax situations. 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.