Invesco (PPA) vs Tema (NASA): Which Aerospace and Space ETF Is the Better Buy?

Invesco Aerospace & Defense ETF (PPA) carries a lower 0.58% expense ratio versus Tema Space Innovators ETF (NASA) at 0.75%, and also offers a 0.37% dividend yield and $8.4 billion in AUM. The article favors PPA for its broader diversification, 61-stock portfolio, and longer track record since 2005, while NASA is positioned as a higher-risk, space-focused alternative launched in April 2026. Overall, it is a comparative ETF analysis with modest relevance to defense and space-investing sentiment rather than a market-moving event.

Analysis

The market is effectively comparing a cash-yielding, defense-heavy compounder versus a venture-style space basket. That matters because in a risk-off tape, capital usually rotates toward businesses with procurement visibility, better margin durability, and less financing dependence; the older defense complex is the beneficiary of that preference, while the space sleeve is more exposed to equity duration and the cost of capital.

The second-order effect is that the space ETF is not just a thematic bet on launch and satellite demand — it is a levered call on investors’ willingness to fund unprofitable growth. If rates stay sticky or credit spreads widen, the names most likely to re-rate lower are the smaller, mission-critical suppliers and operators with recurring equity issuance risk. By contrast, the defense basket should remain relatively insulated because backlogs and government demand create a slower earnings-reset cycle.

Within the disclosed holdings, the market may be underappreciating the divergence between “aerospace industrial” exposure and true space beta. BA and GE are more economically sensitive industrial proxies than pure defense assets, so the defensive quality of the older fund is not perfect; that said, it still has a materially better liquidity profile and a higher probability of capital return support over the next 12 months. ASTS is the most fragile piece of the space trade: it has the highest upside if commercialization accelerates, but it also faces the sharpest multiple compression if execution slips by even one quarter.

Contrarian take: the apparent preference for the lower-cost fund may be too simple. If the space economy keeps attracting speculative flows, the newer ETF can outperform on narrative momentum even with worse fundamentals, especially over 3-6 month horizons. But that outperformance is likely episodic and mean-reverting; the cleaner expression is to own the established defense complex and selectively add single-name space exposure only on pullbacks, not via an all-in thematic basket.

Key Decisions for Investors

• Long PPA vs short NASA as a 3-6 month relative-value trade; thesis is lower financing risk, better liquidity, and less multiple compression in a sticky-rate environment. Target 8-12% spread move; stop if space sentiment broadens and NASA continues to outperform for more than 2-3 weeks on strong volume.
• Overweight RTX and GE over BA inside the defense/aerospace bucket for the next 6-12 months; they offer cleaner operating leverage and lower headline risk than BA. Use BA only as a smaller tactical recovery position, not the core defense exposure.
• For higher-risk accounts, buy ASTS on 20-25% pullbacks only, paired with a short position in a defense ETF or aerospace industrial basket to isolate space beta. Expect wide swings; position size should reflect a potential 30-40% drawdown even if the long-term thesis remains intact.
• If rates back up materially over the next 1-2 months, add to PPA and reduce exposure to NASA immediately; space names are the more duration-sensitive leg of the trade and should react first to funding stress.