PPA Is a One-Ticker Bet on Rising Defense Spending. Nearly 30% of Holdings Are in Just Four Stocks

Invesco Aerospace & Defense ETF (PPA) offers exposure to rising U.S. and NATO defense budgets, including roughly $156B of additional U.S. mandatory defense funding through September 2029 and $384B of planned FY2026 acquisition spending. However, the 63-stock ETF is concentrated: RTX, GE Aerospace, Boeing and Lockheed Martin comprise 28.8% of assets, while the top six holdings account for about 38.7%. PPA closed at $159.78 on September 18, about 11% below its recent level and below its 52-week high above $186, with YTD returns only slightly positive; investors also pay a 0.58% expense ratio.

Analysis

The investable issue is not whether defense outlays rise, but where appropriations convert into revenue and margin. LMT, NOC and GD have the cleanest exposure to classified programs, missile defense, munitions and naval systems, where replenishment cycles and capacity constraints can support multiyear backlog conversion. RTX is more mixed: its defense upside can be offset by commercial-engine supply-chain costs, while BA and GE introduce meaningful civil-aerospace, delivery and aftermarket-cycle beta that can dominate an ostensibly defense-led ETF return.

Over the next 1-3 months, the key catalyst is program-level budget execution rather than top-line spending headlines: supplemental appropriations, production-rate increases, contract awards and management commentary on margin recovery. A defense ETF may lag pure plays if commercial aerospace weakens, because delayed aircraft deliveries or engine-shop-visit disruptions have little relation to military demand but can still pressure its largest constituents. Conversely, a broad risk-on rally could favor PLTR and RKLB more than incumbents, though their returns will depend on valuation tolerance and contract conversion rather than the aggregate procurement cycle.

Consensus appears too focused on a single broad vehicle and insufficiently on the mismatch between exposure and objective. The more attractive structural trade is to own contractors with scarce production capacity and long-duration programs rather than pay for diversified commercial aerospace exposure. This thesis is falsified by a meaningful reduction in procurement authority, cancellation/deferment of major missile, aircraft or naval programs, or two consecutive quarters of backlog deterioration and margin-guide cuts at LMT/NOC/GD.

Key Decisions for Investors

• Favor a 6-18 month equal-weight long basket of LMT, NOC and GD over PPA for dedicated defense exposure; reassess if aggregate backlog growth turns negative or FY2027 procurement guidance is cut. The expected payoff is cleaner budget sensitivity and avoidance of BA/GE-specific execution risk.
• Implement a 3-6 month relative-value trade: long LMT/NOC, short BA in dollar-neutral size after BA strength or ahead of a commercial-aerospace delivery catalyst. Risk is a sharp BA operational recovery or broad cyclicals rally; stop/review on a sustained improvement in BA delivery cadence and free-cash-flow guidance.
• Do not treat PLTR or RKLB as substitutes for prime contractors. Maintain only event-driven watch positions until disclosed defense awards translate into recurring revenue guidance; their downside risk is multiple compression if contract timing slips despite favorable spending rhetoric.
• For existing PPA holders, use the next earnings cycle to assess whether RTX, GE and BA are contributing more to returns than defense pure plays. If commercial-aerospace revisions remain negative, rotate part of exposure into LMT/NOC/GD rather than adding to the ETF.