MTRN vs MP vs CSTM vs KALU vs CRS

For growth investors, MP Materials Corp.

(MP) is the stronger pick with 35. 1% revenue growth year-over-year, versus 4. 3% for Carpenter Technology Corporation (CRS). Constellium SE (CSTM) offers the better valuation at 17. 1x trailing P/E (10. 4x forward), making it the more compelling value choice. Analysts rate Materion Corporation (MTRN) a "Buy" — based on 10 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, Constellium SE (CSTM) is the cheapest at 17.

1x versus Carpenter Technology Corporation at 60. 0x. On forward P/E, Constellium SE is actually cheaper at 10. 4x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Carpenter Technology Corporation wins at 0. 20x versus Materion Corporation's 0. 82x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Carpenter Technology Corporation (CRS) delivered a total return of +985.

7%, compared to +40. 7% for Kaiser Aluminum Corporation (KALU). Over 10 years, the gap is even starker: CRS returned +1387% 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), Carpenter Technology Corporation (CRS) is the lower-risk stock at 1.

37β versus Constellium SE's 1. 85β — meaning CSTM is approximately 35% more volatile than CRS relative to the S&P 500. On balance sheet safety, Carpenter Technology Corporation (CRS) carries a lower debt/equity ratio of 39% versus 2% for Constellium SE — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), MP Materials Corp.

(MP) is pulling ahead at 35. 1% versus 4. 3% for Carpenter Technology Corporation (CRS). On earnings-per-share growth, the picture is similar: Materion Corporation grew EPS 1179% year-over-year, compared to 12. 3% for MP Materials Corp.. Over a 3-year CAGR, CRS leads at 16. 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.

Carpenter Technology Corporation (CRS) is the more profitable company, earning 13.

1% net margin versus -31. 2% for MP Materials Corp. — meaning it keeps 13. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: CRS leads at 18. 1% versus -44. 6% for MP. At the gross margin level — before operating expenses — CRS leads at 26. 7%, 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, Carpenter Technology Corporation (CRS) is the more undervalued stock at a PEG of 0. 20x versus Materion Corporation's 0. 82x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Constellium SE (CSTM) trades at 10. 4x forward P/E versus 274. 3x for MP Materials Corp. — 263. 9x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for MP: 13. 2% to $78. 25.

In this comparison, KALU (1.

8% yield), MTRN (0. 3% yield), CRS (0. 2% yield) pay a dividend. MP, CSTM do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Carpenter Technology Corporation (CRS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+1387% 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 (CRS: +1387%, 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 (MTRN (Basic Materials) and MP (Basic Materials) and CSTM (Basic Materials) and KALU (Basic Materials) and CRS (Industrials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: MTRN is a small-cap quality compounder stock; MP is a mid-cap high-growth stock; CSTM is a small-cap high-growth stock; KALU is a small-cap quality compounder stock; CRS is a mid-cap quality compounder stock. KALU pays a dividend while MTRN, MP, CSTM, CRS 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.