CSTM vs AA vs KALU vs CENX vs ATI

For growth investors, Constellium SE (CSTM) is the stronger pick with 15.

2% revenue growth year-over-year, versus 4. 5% for Alcoa Corporation (AA). Alcoa Corporation (AA) offers the better valuation at 14. 1x trailing P/E (9. 0x forward), making it the more compelling value choice. Analysts rate Constellium SE (CSTM) a "Buy" — based on 17 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, Alcoa Corporation (AA) is the cheapest at 14.

1x versus Century Aluminum Company at 144. 2x. On forward P/E, Century Aluminum Company is actually cheaper at 5. 8x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, ATI Inc.

(ATI) delivered a total return of +572. 7%, compared to +40. 7% for Kaiser Aluminum Corporation (KALU). Over 10 years, the gap is even starker: ATI returned +1050% versus KALU's +135. 1%. 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), ATI Inc.

(ATI) is the lower-risk stock at 1. 51β versus Constellium SE's 1. 85β — meaning CSTM is approximately 22% more volatile than ATI relative to the S&P 500. On balance sheet safety, Alcoa Corporation (AA) carries a lower debt/equity ratio of 0% versus 2% for Constellium SE — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Constellium SE (CSTM) is pulling ahead at 15.

2% versus 4. 5% for Alcoa Corporation (AA). On earnings-per-share growth, the picture is similar: Alcoa Corporation grew EPS 1486% year-over-year, compared to -87. 2% for Century Aluminum Company. 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.

Alcoa Corporation (AA) is the more profitable company, earning 9.

0% net margin versus 1. 7% for Century Aluminum Company — meaning it keeps 9. 0% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ATI leads at 13. 8% versus 5. 6% for CSTM. At the gross margin level — before operating expenses — ATI leads at 21. 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.

On forward earnings alone, Century Aluminum Company (CENX) trades at 5.

8x forward P/E versus 37. 9x for ATI Inc. — 32. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for CENX: 25. 5% to $76. 00.

In this comparison, KALU (1.

8% yield), AA (0. 6% yield) pay a dividend. CSTM, CENX, ATI do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, ATI Inc.

(ATI) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+1050% 10Y return). Constellium SE (CSTM) carries a higher beta of 1. 85 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (ATI: +1050%, CSTM: +503. 1%), 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 (CSTM (Basic Materials) and AA (Basic Materials) and KALU (Basic Materials) and CENX (Basic Materials) and ATI (Industrials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: CSTM is a small-cap high-growth stock; AA is a mid-cap deep-value stock; KALU is a small-cap quality compounder stock; CENX is a small-cap quality compounder stock; ATI is a mid-cap quality compounder stock. AA, KALU pay a dividend while CSTM, CENX, ATI do 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.