ASPN vs MTRN vs KALU vs MP

For growth investors, MP Materials Corp.

(MP) is the stronger pick with 35. 1% revenue growth year-over-year, versus -40. 1% for Aspen Aerogels, Inc. (ASPN). Kaiser Aluminum Corporation (KALU) offers the better valuation at 26. 0x trailing P/E (18. 7x forward), making it the more compelling value choice. Analysts rate Aspen Aerogels, Inc. (ASPN) a "Buy" — based on 23 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, Kaiser Aluminum Corporation (KALU) is the cheapest at 26.

0x versus Materion Corporation at 53. 4x. On forward P/E, Kaiser Aluminum Corporation is actually cheaper at 18. 7x. 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 Materion Corporation's 0. 82x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Materion Corporation (MTRN) delivered a total return of +155.

6%, compared to -73. 5% for Aspen Aerogels, Inc. (ASPN). Over 10 years, the gap is even starker: MTRN returned +724. 3% versus ASPN's +13. 6%. 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. 40β versus Aspen Aerogels, Inc. 's 1. 92β — meaning ASPN is approximately 37% more volatile than MP relative to the S&P 500. On balance sheet safety, MP Materials Corp. (MP) carries a lower debt/equity ratio of 44% versus 136% for Kaiser Aluminum Corporation — 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 -40. 1% for Aspen Aerogels, Inc. (ASPN). On earnings-per-share growth, the picture is similar: Materion Corporation grew EPS 1179% year-over-year, compared to -28. 9% for Aspen Aerogels, Inc.. Over a 3-year CAGR, ASPN leads at 14. 5% 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.

Materion Corporation (MTRN) is the more profitable company, earning 4.

2% net margin versus -143. 7% for Aspen Aerogels, Inc. — meaning it keeps 4. 2% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: MTRN leads at 6. 5% versus -44. 6% for MP. At the gross margin level — before operating expenses — ASPN leads at 17. 0%, 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 Materion Corporation's 0. 82x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Kaiser Aluminum Corporation (KALU) trades at 18. 7x forward P/E versus 274. 3x for MP Materials Corp. — 255. 6x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ASPN: 502. 2% to $30. 71.

In this comparison, KALU (1.

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

For long-horizon retirement investors, MP Materials Corp.

(MP) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+591. 3% 10Y return). Aspen Aerogels, Inc. (ASPN) carries a higher beta of 1. 92 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (MP: +591. 3%, ASPN: +13. 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.

These companies operate in different sectors (ASPN (Industrials) and MTRN (Basic Materials) and KALU (Basic Materials) and MP (Basic Materials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

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