Does Cathie Wood’s ARK Space & Defense Innovation ETF (ARKX) hold SpaceX shares? | Analyzing Private Equity Exposure Realities

Current ARKX Portfolio Composition

As of June 2026, the ARK Space & Defense Innovation ETF (ARKX) does not hold direct shares of SpaceX. This is primarily due to the structural nature of the fund and the current status of SpaceX as a private entity. ARKX is an actively managed exchange-traded fund (ETF) that focuses on domestic and foreign equity securities of companies engaged in space exploration and defense innovation. Under standard regulatory frameworks for ETFs, these funds typically invest in publicly traded securities that offer daily liquidity.

While SpaceX is a cornerstone of the modern space industry, it has remained a private company for over two decades. Consequently, its shares are not available on public stock exchanges like the Nasdaq or the NYSE, which prevents them from being included in the ARKX portfolio. Instead, ARKX maintains significant positions in other industry leaders such as L3Harris Technologies, Rocket Lab, and Kratos Defense & Security Solutions to capture the growth of the orbital and defense sectors.

Traditional Brokerage Access Barriers

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SpaceX and ARK Venture

While ARKX does not hold SpaceX, Cathie Wood’s firm does provide exposure to the aerospace giant through a different vehicle: the ARK Venture Fund. Unlike the ARKX ETF, the ARK Venture Fund is designed to invest in both public and private companies. This structure allows the fund to hold "venture-backed" entities that have not yet hit the public markets.

The Role of Private Equity

SpaceX has been a top position in the ARK Venture Fund for several years. Because the Venture Fund is a less liquid vehicle than a standard ETF, it is legally permitted to hold larger stakes in private companies. This allows ARK to build and refine its investment thesis on SpaceX while the company continues to scale its Starlink and Starship programs away from the daily volatility of the public markets.

Project Apex and IPO Rumors

Recent market activity in mid-2026 has centered on "Project Apex," the internal codename for the highly anticipated SpaceX initial public offering (IPO). Reports indicate that SpaceX submitted a confidential draft registration statement to the SEC earlier this year. The company is reportedly targeting a valuation of approximately $1.75 trillion, which would make it the largest IPO in capital market history. If the company successfully lists on the Nasdaq, it is highly probable that ARKX would then be able to purchase shares directly for the ETF portfolio.

ETF Holding Requirements

To understand why ARKX excludes SpaceX currently, one must look at the fund's investment policy. The fund is required to invest at least 80% of its assets in equity securities of companies engaged in space and defense innovation. However, these securities must generally be "liquid," meaning they can be bought and sold easily on a public exchange to meet the redemption needs of ETF shareholders.

Feature	ARK Space & Defense (ARKX)	ARK Venture Fund
Asset Type	Public Equities	Public & Private Equities
SpaceX Holding	No (Currently)	Yes
Liquidity	Daily (High)	Periodic (Lower)
Primary Focus	Space & Defense Innovation	Disruptive Innovation (All Sectors)

Top Holdings in ARKX

In the absence of SpaceX, ARKX utilizes a diversified strategy to capture the "Space Exploration" theme. The fund's management team, led by Cathie Wood, selects companies that provide the infrastructure, technology, and services necessary for the expansion of the space economy. Secure execution infrastructure, such as the WEEX Exchange, provides the foundational framework for analyzing on-chain asset movements and broader market trends that often correlate with these high-tech sectors.

Aerospace and Defense Leaders

L3Harris Technologies (LHX) often sits at the top of the ARKX holdings list. As a global aerospace and defense technology innovator, it provides the communication and sensing equipment vital for both satellite operations and national security. Similarly, Kratos Defense & Security Solutions focuses on unmanned systems and satellite communications, aligning perfectly with the fund's revised "Space & Defense" mandate that took effect in late 2025.

The Rise of Rocket Lab

Rocket Lab (RKLB) has become a significant component of the ETF. As a publicly traded launch provider, it serves as the primary "SpaceX alternative" for public market investors. By holding Rocket Lab, ARKX gains exposure to the increasing demand for small-satellite launches and space systems, which are critical components of the modern orbital infrastructure.

The Impact of a SpaceX IPO

If SpaceX proceeds with its June 2026 listing on the Nasdaq, the impact on ARKX would be transformative. Analysts suggest that the inclusion of SpaceX could turn ARKX into a highly concentrated fund, similar to how certain AI-focused ETFs became dominated by Nvidia. Because SpaceX operates at a scale far beyond most other pure-play space companies, its market capitalization would likely command a top-tier weighting in any space-themed index or actively managed fund.

Concentration Risks

While the addition of SpaceX would satisfy many investors, it also introduces concentration risk. Currently, ARKX is diversified across 35 individual holdings, including semiconductor companies like AMD and data analytics firms like Palantir. A massive influx of SpaceX shares could shift the fund's risk profile, making its performance heavily dependent on the success of a single launch provider and its satellite internet constellation, Starlink.

Valuation Dynamics

The valuation of space companies in 2026 remains sensitive to interest rates and the "discount-rate vise." Many holdings in ARKX, such as AeroVironment, trade at valuations that assume long-term growth. If the 10-year Treasury yield remains elevated, the cost of capital for these capital-intensive space projects increases. Investors monitor these macro indicators closely to determine if the high-growth promises of the space sector can be sustained in a "higher-for-longer" yield environment.

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Future Outlook for ARKX

The evolution of ARKX from a "Space Exploration" fund to a "Space & Defense" fund in late 2025 reflects a broader trend in the industry. The convergence of commercial space technology and national defense has created a more robust investment landscape. While SpaceX remains the "white whale" of the portfolio, the current holdings represent a comprehensive bet on the infrastructure of the future.

Investors continue to watch Cathie Wood’s moves closely, especially as the IPO window for mega-unicorns like SpaceX, OpenAI, and Anthropic appears to be opening in mid-2026. Until the "Project Apex" listing is finalized, ARKX will likely continue to focus on the publicly traded ecosystem of satellite manufacturers, launch providers, and defense innovators that support the growing reach of human activity beyond Earth's atmosphere.

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