LXFR vs KALU vs CENX vs CSTM vs MTRN

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

2% revenue growth year-over-year, versus -1. 9% for Luxfer Holdings PLC (LXFR). Luxfer Holdings PLC (LXFR) offers the better valuation at 13. 5x trailing P/E (12. 9x forward), making it the more compelling value choice. Analysts rate Luxfer Holdings PLC (LXFR) a "Buy" — based on 9 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, Luxfer Holdings PLC (LXFR) is the cheapest at 13.

5x 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. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Kaiser Aluminum Corporation wins at 0. 62x versus Luxfer Holdings PLC's 1. 32x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Century Aluminum Company (CENX) delivered a total return of +283.

2%, compared to -21. 3% for Luxfer Holdings PLC (LXFR). Over 10 years, the gap is even starker: CENX returned +794. 8% versus LXFR's +68. 9%. 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), Luxfer Holdings PLC (LXFR) is the lower-risk stock at 1.

37β versus Constellium SE's 1. 85β — meaning CSTM is approximately 35% more volatile than LXFR relative to the S&P 500. On balance sheet safety, Luxfer Holdings PLC (LXFR) carries a lower debt/equity ratio of 17% 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 -1. 9% for Luxfer Holdings PLC (LXFR). On earnings-per-share growth, the picture is similar: Materion Corporation grew EPS 1179% year-over-year, compared to -87. 2% for Century Aluminum Company. Over a 3-year CAGR, MTRN leads at 0. 6% 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.

Luxfer Holdings PLC (LXFR) is the more profitable company, earning 8.

1% net margin versus 1. 7% for Century Aluminum Company — meaning it keeps 8. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: MTRN leads at 6. 5% versus 5. 6% for CSTM. At the gross margin level — before operating expenses — LXFR leads at 23. 2%, 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, Kaiser Aluminum Corporation (KALU) is the more undervalued stock at a PEG of 0. 62x versus Luxfer Holdings PLC's 1. 32x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Century Aluminum Company (CENX) trades at 5. 8x forward P/E versus 30. 0x for Materion Corporation — 24. 2x 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, LXFR (3.

3% yield), KALU (1. 8% yield), MTRN (0. 3% yield) pay a dividend. CENX, CSTM do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Luxfer Holdings PLC (LXFR) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (3.

3% yield). 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 (LXFR: +68. 9%, 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 (LXFR (Industrials) and KALU (Basic Materials) and CENX (Basic Materials) and CSTM (Basic Materials) and MTRN (Basic Materials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

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