SIDU vs ASTS

For growth investors, AST SpaceMobile, Inc.

(ASTS) is the stronger pick with 1505% revenue growth year-over-year, versus -21. 6% for Sidus Space, Inc. (SIDU). Analysts rate Sidus Space, Inc. (SIDU) a "Buy" — based on 3 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 +688. 2%, compared to -99. 8% for Sidus Space, Inc. (SIDU). Over 10 years, the gap is even starker: ASTS returned +568. 8% versus SIDU's -99. 8%. 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), Sidus Space, Inc.

(SIDU) is the lower-risk stock at 2. 64β versus AST SpaceMobile, Inc. 's 2. 82β — meaning ASTS is approximately 7% more volatile than SIDU relative to the S&P 500. On balance sheet safety, AST SpaceMobile, Inc. (ASTS) carries a lower debt/equity ratio of 1% versus 43% for Sidus Space, 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 -21. 6% for Sidus Space, Inc. (SIDU). On earnings-per-share growth, the picture is similar: Sidus Space, Inc. grew EPS 84. 7% year-over-year, compared to 30. 9% for AST SpaceMobile, 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.

Sidus Space, Inc.

(SIDU) is the more profitable company, earning -375. 0% net margin versus -482. 2% for AST SpaceMobile, Inc. — meaning it keeps -375. 0% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: SIDU leads at -336. 4% 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.

None of the stocks in this comparison currently pay a material dividend.

All are effectively zero-yield and should be held for capital appreciation rather than 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 (+568. 8% 10Y return). Sidus Space, Inc. (SIDU) carries a higher beta of 2. 64 — 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: +568. 8%, SIDU: -99. 8%), 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 (SIDU (Industrials) and ASTS (Technology)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: SIDU is a small-cap quality compounder stock; ASTS is a mid-cap high-growth 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.