ACA vs SPIR vs MLM vs ASTS

For growth investors, AST SpaceMobile, Inc.

(ASTS) is the stronger pick with 1505% revenue growth year-over-year, versus -35. 2% for Spire Global, Inc. (SPIR). Spire Global, Inc. (SPIR) offers the better valuation at 13. 4x trailing P/E, making it the more compelling value choice. Analysts rate Arcosa, Inc. (ACA) a "Buy" — based on 8 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, Spire Global, Inc.

(SPIR) is the cheapest at 13. 4x versus Martin Marietta Materials, Inc. at 29. 7x. On forward P/E, Martin Marietta Materials, Inc. is actually cheaper at 29. 1x — 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: Arcosa, Inc. wins at 2. 05x versus Martin Marietta Materials, Inc. 's 2. 84x.

Over the past 5 years, AST SpaceMobile, Inc.

(ASTS) delivered a total return of +1052%, compared to -74. 7% for Spire Global, Inc. (SPIR). Over 10 years, the gap is even starker: ASTS returned +756. 4% versus SPIR's -73. 7%. 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), Martin Marietta Materials, Inc.

(MLM) is the lower-risk stock at 0. 90β versus Spire Global, Inc. 's 3. 29β — meaning SPIR is approximately 267% more volatile than MLM relative to the S&P 500. On balance sheet safety, Spire Global, Inc. (SPIR) carries a lower debt/equity ratio of 12% versus 94% for AST SpaceMobile, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), AST SpaceMobile, Inc.

(ASTS) is pulling ahead at 1505% versus -35. 2% for Spire Global, Inc. (SPIR). On earnings-per-share growth, the picture is similar: Spire Global, Inc. grew EPS 135. 0% year-over-year, compared to -42. 0% for Martin Marietta Materials, Inc.. Over a 3-year CAGR, ASTS leads at 72. 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.

Spire Global, Inc.

(SPIR) is the more profitable company, earning 71. 7% net margin versus -482. 2% for AST SpaceMobile, Inc. — meaning it keeps 71. 7% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: MLM leads at 23. 3% versus -405. 7% for ASTS. At the gross margin level — before operating expenses — ASTS leads at 53. 4%, 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, Arcosa, Inc. (ACA) is the more undervalued stock at a PEG of 2. 05x versus Martin Marietta Materials, Inc. 's 2. 84x. Both stocks trade at elevated growth-adjusted valuations, so expected growth needs to materialise. On forward earnings alone, Martin Marietta Materials, Inc. (MLM) trades at 29. 1x forward P/E versus 29. 1x for Arcosa, Inc. — 0. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for MLM: 24. 8% to $697. 40.

In this comparison, MLM (0.

6% yield), ACA (0. 2% yield) pay a dividend. SPIR, ASTS do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Martin Marietta Materials, Inc.

(MLM) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 90), 0. 6% yield, +212. 3% 10Y return). Spire Global, Inc. (SPIR) carries a higher beta of 3. 29 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (MLM: +212. 3%, SPIR: -73. 7%), 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 (ACA (Industrials) and SPIR (Industrials) and MLM (Basic Materials) and ASTS (Technology)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: ACA is a small-cap quality compounder stock; SPIR is a large-cap deep-value stock; MLM is a mid-cap quality compounder stock; ASTS is a mid-cap high-growth stock. MLM pays a dividend while ACA, SPIR, ASTS 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.