The final trading week of 2025 has launched with a literal bang for the aerospace sector. On the morning of December 24, “Space Concept” stocks defied broader market caution, with Sidus Space (SIDU) rocketing over 24%, AST SpaceMobile (ASTS) climbing 6%, and Redwire (RDW) gaining over 3%. This intraday volatility isn’t just retail noise; it reflects a fundamental shift in the space economy as speculative startups mature into infrastructure providers with real-world contracts.
While the triple-digit intraday moves of Sidus Space capture the headlines, the critical question for investors is where to park capital for 2026. Is the most “valuable” buy the explosive defense-tech newcomer, the satellite-to-phone disruptor, or the quiet infrastructure backbone of the orbital economy?
Sidus Space: The High-Octane Defense Play
Sidus Space has become the talk of the town following its inclusion in the $151 billion “SHIELD” program from the Missile Defense Agency. This federal validation is what drove the stock to surge by nearly 100% on Monday before settling into its current volatile climb. By securing a spot in this massive defense buildout, Sidus has pivoted from a “Space-as-a-Service” startup to a credible defense contractor.
However, investors should tread carefully. Despite the recent surge to approximately $2.29, the company recently announced a public offering to raise capital, which typically leads to shareholder dilution. While its technical milestones, such as the successful commissioning of LizzieSat-3, prove its hardware works, the company’s operating margins remain deeply negative. Sidus is currently a classic high-risk, high-reward “Buy” only for those who believe its defense revenue will scale fast enough to outpace its burn rate.
AST SpaceMobile: The Infrastructure Titan
For those seeking a more established growth narrative, AST SpaceMobile remains the sector’s heavy hitter. The stock’s 6% gain today follows the successful orbital launch of BlueBird 6, which features the largest commercial communications array ever deployed in low Earth orbit. ASTS is no longer a theoretical “pre-revenue” bet; it is in the early stages of deploying a network that covers nearly 3 billion mobile subscribers through global carrier agreements.
Valuation-wise, ASTS has a market cap exceeding $31 billion. While traditional P/E ratios are irrelevant as it is not yet GAAP profitable, the company’s revenue is forecast to grow at an annual rate of over 57%. With a 52-week high of $102.79 and current prices hovering around $84, the stock is consolidating for its next leg up as it moves toward its goal of breakeven in 2026. It represents the “Value” pick in terms of market dominance and moat.
Redwire: The Undervalued “Toll Booth”
Perhaps the most overlooked winner in today’s session is Redwire. While its 3% gain is modest compared to Sidus, its fundamentals are arguably the strongest. Redwire recently secured an eight-figure contract with Europe’s “The Exploration Company” for advanced docking systems, marking a successful expansion into the international market.
Redwire currently trades at a Price-to-Sales (P/S) ratio of just 1.4x, making it significantly “cheaper” than the high-flying ASTS or the volatile SIDU. With analysts forecasting the company to turn free cash flow positive in 2026, Redwire is the “Buy” for the disciplined investor. It provides the essential components—solar arrays, sensors, and docking mechanisms—that every other space company needs to function.
Verdict: Where to Invest?
If you are looking for a speculative “moonshot,” Sidus Space offers the most intraday momentum, but its financial instability makes it a gamble. AST SpaceMobile is the best play for those who want a piece of a potential trillion-dollar telecommunications shift. However, for a balance of valuation and stability, Redwire is the most fundamentally sound buy in the current environment.
The space sector in late 2025 is no longer about just “getting there”; it is about who owns the orbital real estate and the infrastructure that connects it. As these companies join major indices and secure sovereign contracts, the window for “cheap” entry is rapidly closing.