Lockheed Martin vs. RTX: Which Defense Stock Is a Better Buy in 2026?

Lockheed Martin posted FY2025 revenue of $75.1B (+5.7%) and free cash flow of $6.9B, while RTX generated $88.6B in revenue (+9.8%) and $7.94B in free cash flow. The article argues Lockheed is the better value on cheaper valuation multiples (17x forward P/E vs. 26.7x for RTX; 1.6x vs. 2.8x P/S), though RTX has higher growth and diversification. Key risks include Lockheed’s customer concentration and F-35 execution, and RTX’s supply-chain issues, regulatory scrutiny, and Pratt & Whitney engine inspections through 2026.

Analysis

The market is effectively pricing two different defense regimes: LMT as a quasi-annuity on U.S. procurement, and RTX as a broader industrial recovery story with embedded cleanup risk. The valuation gap is telling: LMT’s cheaper multiple is not just “defensive discount,” it reflects lower execution optionality and a more concentrated revenue base, while RTX deserves a premium only if Pratt & Whitney and supply-chain remediation stop consuming management bandwidth. In other words, RTX has more operational beta, but LMT has cleaner cash visibility.

Second-order effects matter more than headline growth. RTX’s commercial aerospace exposure gives it upside if narrowbody utilization and aftermarket demand stay firm, but that same mix makes it more sensitive to parts shortages, labor inflation, and airline capex deferrals than a pure-defense peer. By contrast, LMT’s concentration risk cuts both ways: a few budget/program decisions can move the stock faster than fundamentals, and the long-duration F-35 backlog can become a political asset if NATO and Indo-Pacific rearmament stays elevated for years.

The near-term catalyst set is asymmetric. RTX needs multiple quarters of execution improvement before the market pays for growth, so any new inspection issue, DOJ/SEC headline, or engine-related slip likely compresses the multiple quickly. LMT’s main upside catalyst is not revenue acceleration but multiple re-rating if investors gain confidence that F-35 sustainment and missiles can compound free cash flow without litigation overhangs or program slippage. The contrarian miss is that RTX may be the better operating business, but LMT is the better stock if the macro backdrop remains geopolitical rather than cyclical.

Key Decisions for Investors

• Long LMT / short RTX as a 6-12 month relative-value pair: target 10-15% outperformance for LMT if defense spending stays sticky and RTX remediation drags on multiple expansion; stop if RTX delivers two clean quarters of margin and production improvement.
• Buy LMT on pullbacks below ~16-17x forward earnings for a 12-18 month hold; the risk/reward is strongest if the market over-discounts customer concentration while cash flow remains resilient.
• Avoid initiating new RTX longs ahead of the next two earnings prints unless you are explicitly underwriting a remediation reset; the stock can de-rate fast on any fresh Pratt & Whitney or compliance headline.
• For event-driven exposure, consider a modest RTX call spread only after confirmation that accelerated inspections are stabilizing; this gives upside to a re-rating while capping premium at risk over 3-6 months.
• Use LMT as the lower-volatility defense hedge within a geopolitical basket, pairing it against cyclical industrial exposure rather than owning RTX outright if the objective is policy-driven cash-flow durability.