Analysts contrast passive defence giants with active space innovation in ETF comparison

The Motley Fool published an analysis on 7 June 2026 comparing two exchange-traded funds targeting the aerospace and defence sectors. The report contrasts the iShares U.S. Aerospace & Defense ETF (ITA) with the ARK Space & Defense Innovation ETF (ARKX), outlining distinct approaches to capitalising on global defence spending at generational highs. The comparison highlights the structural differences between passive exposure to established contractors and active management focused on disruptive space technologies.

ITA provides passive exposure to established U.S. defence contractors and manages $13.6 billion in assets under management. Launched in 2006, the fund tracks a market-cap-weighted index of domestic aerospace firms. Its portfolio consists of 44 holdings concentrated in domestic giants, with top positions in GE Aerospace, RTX, and Boeing. The fund is exclusively focused on the industrials sector, offering investors exposure to the domestic supply chain and major government contractors.

In contrast, the ARK Space & Defense Innovation ETF employs an active management strategy focused on global space innovation. Launched in 2021, ARKX holds approximately $717.3 million in assets and charges a 0.75% expense ratio. The fund takes a more diversified sector approach, with approximately 56% in industrials, 27% in technology, and 8% in consumer cyclicals. Its largest positions include Advanced Micro Devices, Rocket Lab, and L3Harris Technologies.

Cost efficiency remains a significant differentiator between the two vehicles. ITA carries an expense ratio of 0.38%, which is nearly half the fee charged by ARKX. The analysis notes that this lower fee structure provides a persistent advantage for the iShares fund, as higher expenses can significantly erode total returns over an extended investment horizon. For long-term investors, the cost disparity creates a higher hurdle for the active fund to outperform the passive alternative.

Volatility profiles also diverge sharply, with ARKX reporting a beta of 1.42 relative to the S&P 500. This indicates higher price volatility compared to ITA, reflecting the risks associated with owning frontier technology companies rather than established primes. The Motley Fool’s Stock Advisor service, which cited historical outperformance from stocks like Netflix and Nvidia, did not include ITA in its current top ten recommendations, suggesting a preference for high-growth opportunities over the stability offered by traditional defence contractors.