Firefly Aerospace vs. Rocket Lab: Which Space Stock Is a Better Buy in 2026?

Rocket Lab is identified as the preferred 2026 space-stock pick, supported by FY2025 revenue growth of 38% to $601.8M, a backlog above $2B, increasing launches, and the prospective Neutron rocket program. Firefly grew revenue 163% to $159.9M but posted a $298.3M net loss and negative $237.8M free cash flow, while Rocket Lab reported a $198.2M loss and negative $321.8M free cash flow. Rocket Lab's stronger commercial scale comes at a materially richer valuation, with a 49.0x P/S ratio and 1,100x forward P/E versus Firefly's 12.1x P/S ratio.

Analysis

The relevant valuation question is not launch cadence but the probability-adjusted transition from a subscale launch provider to a vertically integrated defense-space prime. RKLB’s premium implies investors are already underwriting successful Neutron development, rising space-systems mix, and eventual operating leverage simultaneously; any one leg can work, but the equity is vulnerable if development spending persists without a visible revenue conversion date. FLY’s lower sales multiple is not necessarily cheap: its cash burn relative to revenue means future contract wins may fund program execution rather than create near-term equity value.

Over the next 1-3 months, launch outcomes, Neutron schedule/milestone disclosures, and order-book quality matter more than annual revenue growth. For RKLB, a delay that shifts first meaningful Neutron revenue by even 12 months could compress the multiple sharply because the current valuation leaves little room for a higher discount rate or further capex escalation. For FLY, the key catalyst is evidence that SciTec adds higher-margin software/mission-services revenue rather than simply broadening an already capital-intensive platform.

The non-obvious beneficiary of sustained government demand is not necessarily the launch operator but defense primes with funded payload, missile-defense, and space-domain-awareness programs. LMT and NOC offer lower-beta exposure to the same budget cycle and can gain negotiating leverage if launch capacity remains constrained. Contrarian view: the market may be overpaying for scarcity in dedicated small launch just as rideshare economics and larger reusable vehicles reduce pricing power; successful launches alone do not establish attractive long-run margins.

Key Decisions for Investors

• Maintain RKLB as a tactical, catalyst-driven long only on pullbacks around independently verified Neutron milestone progress; use a 3-6 month horizon and size as venture-style risk. Exit or hedge if management moves the first-launch or first-revenue timeline by more than two quarters, or if space-systems growth decelerates while cash burn rises.
• Prefer a relative-value pair of long LMT or NOC / short RKLB for 6-12 months where mandate permits: primes monetize defense-space appropriations today, while RKLB carries execution and duration risk. Reassess if RKLB secures a material, funded Neutron contract that validates pricing and utilization before vehicle completion.
• Keep FLY on a watchlist rather than initiate on the lower P/S multiple. Require post-acquisition segment disclosure showing software/mission-services gross-margin accretion and a credible cash runway; absent that, a discounted equity multiple can persist through additional capital raises.
• Monitor BA as a potential indirect loser from procurement substitution toward more agile space suppliers, but do not short solely on this theme: its space exposure is too small versus commercial aerospace. A clearer trade signal would be a major defense award loss or backlog revision attributable to competitive displacement.