GSM vs MTRN vs MP vs CSTM vs AA

For growth investors, MP Materials Corp.

(MP) is the stronger pick with 35. 1% revenue growth year-over-year, versus -18. 8% for Ferroglobe PLC (GSM). Alcoa Corporation (AA) offers the better valuation at 14. 2x trailing P/E (8. 8x forward), making it the more compelling value choice. Analysts rate Ferroglobe PLC (GSM) a "Buy" — based on 11 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.

2x versus Materion Corporation at 55. 7x. On forward P/E, Alcoa Corporation is actually cheaper at 8. 8x.

Over the past 5 years, Materion Corporation (MTRN) delivered a total return of +167.

4%, compared to -1. 2% for Ferroglobe PLC (GSM). Over 10 years, the gap is even starker: MTRN returned +759. 2% versus GSM's -53. 3%. 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), MP Materials Corp.

(MP) is the lower-risk stock at 1. 44β versus Constellium SE's 1. 87β — meaning CSTM is approximately 29% more volatile than MP 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), MP Materials Corp.

(MP) is pulling ahead at 35. 1% versus -18. 8% for Ferroglobe PLC (GSM). On earnings-per-share growth, the picture is similar: Alcoa Corporation grew EPS 1486% year-over-year, compared to -31. 3% for Ferroglobe PLC. 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.

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

0% net margin versus -31. 2% for MP Materials Corp. — meaning it keeps 9. 0% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: AA leads at 7. 6% versus -44. 6% for MP. At the gross margin level — before operating expenses — MTRN leads at 16. 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.

On forward earnings alone, Alcoa Corporation (AA) trades at 8.

8x forward P/E versus 254. 2x for MP Materials Corp. — 245. 4x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for MP: 20. 1% to $81. 00.

In this comparison, GSM (1.

4% yield), AA (0. 6% yield), MTRN (0. 3% 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, Ferroglobe PLC (GSM) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (1.

4% yield). Constellium SE (CSTM) carries a higher beta of 1. 87 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (GSM: -53. 3%, CSTM: +521. 6%), 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.

Both stocks operate in the Basic Materials sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: GSM is a small-cap quality compounder stock; MTRN is a small-cap quality compounder stock; MP is a mid-cap high-growth stock; CSTM is a small-cap high-growth stock; AA is a mid-cap deep-value stock. GSM, AA pay a dividend while MTRN, MP, CSTM 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.