FLY vs MNTS vs ASTS vs SPIR

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 11. 0x trailing P/E, making it the more compelling value choice. Analysts rate Firefly Aerospace Inc. (FLY) a "Buy" — based on 7 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.

Over the past 5 years, AST SpaceMobile, Inc.

(ASTS) delivered a total return of +892. 7%, compared to -99. 9% for Momentus Inc. (MNTS). Over 10 years, the gap is even starker: ASTS returned +646. 8% versus MNTS's -99. 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), AST SpaceMobile, Inc.

(ASTS) is the lower-risk stock at 2. 83β versus Momentus Inc. 's 3. 65β — meaning MNTS is approximately 29% more volatile than ASTS relative to the S&P 500. On balance sheet safety, Spire Global, Inc. (SPIR) carries a lower debt/equity ratio of 8% 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 137. 8% year-over-year, compared to -161. 0% for Firefly Aerospace Inc.. Over a 3-year CAGR, MNTS leads at 85. 7% 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 -1653. 1% for Momentus Inc. — meaning it keeps 71. 7% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: SPIR leads at -121. 4% versus -1404. 1% for MNTS. At the gross margin level — before operating expenses — MNTS leads at 96. 9%, 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.

In this comparison, FLY (0.

2% yield) pays a dividend. MNTS, ASTS, SPIR do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, AST SpaceMobile, Inc.

(ASTS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+646. 8% 10Y return). Momentus Inc. (MNTS) carries a higher beta of 3. 65 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (ASTS: +646. 8%, MNTS: -99. 9%), 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 (FLY (Industrials) and MNTS (Industrials) and ASTS (Technology) and SPIR (Industrials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: FLY is a small-cap high-growth stock; MNTS is a small-cap quality compounder stock; ASTS is a mid-cap high-growth stock; SPIR is a large-cap deep-value stock. 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.