Space Exploration ETFs: How They Work and What They Hold

The best space exploration ETF depends on the type of exposure an investor wants. The Procure Space ETF (UFO) focuses on companies involved in the space economy, while the ARK Space & Defense Innovation ETF (ARKX) takes a broader approach that includes aerospace, defense, and enabling technologies.

Both funds allow retail investors to buy a portfolio of space-related stocks through a single exchange-traded security. However, their holdings, investment strategies, and exposure to individual companies can differ significantly.

As of October 2026, both UFO and ARKX have annual expense ratios of 0.75%. Both also provide exposure to SpaceX, although the percentage invested in the company can change as stock prices and portfolio allocations move.

For investors interested in satellites, rockets, spacecraft, and commercial space infrastructure, understanding what these ETFs actually own is more important than choosing a fund based on its name.

What Is a Space Exploration ETF?

A space exploration ETF is an exchange-traded fund that invests in companies connected to the space industry.

Instead of buying individual shares of several businesses, investors purchase shares of one fund that holds a portfolio of securities.

Depending on its investment strategy, a space ETF may include companies involved in:

• Rocket launches and spacecraft manufacturing.
• Satellite communications and broadband networks.
• Earth observation and satellite imagery.
• Aerospace and defense systems.
• Navigation and positioning technologies.
• Space infrastructure and supporting equipment.
• Robotics and other technologies used in aerospace applications.

These businesses do not all depend on the same economic drivers.

A satellite communications company may generate revenue from recurring customer subscriptions, while a launch provider earns revenue from missions and contracts.

An aerospace manufacturer may depend heavily on government spending, whereas an Earth observation company may sell data services to commercial customers.

A space ETF combines several of these business models into one investment.

For a broader explanation of the companies operating across the industry, see Space Stocks Explained: A Guide to the Companies Investors Should Know.

How Do Space Exploration ETFs Work?

Space ETFs operate similarly to other equity ETFs.

Investors purchase shares through a brokerage account, and the fund holds a portfolio of stocks according to its investment strategy.

The value of the ETF changes as the market value of its underlying holdings fluctuates.

However, not all space ETFs select their investments in the same way.

Index-Based Space ETFs

An index-based ETF attempts to track a defined group of companies selected according to predetermined rules.

Those rules may consider business activities, revenue exposure, market capitalization, liquidity, and other criteria.

The Procure Space ETF follows this general approach by seeking to track the performance of the VettaFi Space Index before fees and expenses.

Its portfolio reflects the index methodology rather than individual stock selections made entirely at the discretion of a portfolio manager.

Actively Managed Space ETFs

An actively managed ETF allows investment managers to select and adjust holdings according to the fund's investment objectives.

ARKX follows this approach.

Its managers can adjust exposure to companies involved in space, defense, and related innovation themes.

This flexibility may allow the fund to respond to changing business conditions, but it also introduces additional dependence on investment decisions made by the management team.

Neither approach guarantees better performance.

An index fund can suffer when its underlying industry declines, while an actively managed fund can underperform because of unsuccessful stock selections.

Procure Space ETF (UFO): A Focus on the Space Economy

The Procure Space ETF, trading under the ticker UFO, is designed to provide exposure to companies involved in space-related businesses.

The fund began trading in April 2019 and seeks to track the VettaFi Space Index.

Its investment universe includes businesses associated with satellite communications, launch services, spacecraft manufacturing, Earth observation, and supporting technologies.

UFO is particularly relevant for investors who want a portfolio centered on the commercial space economy rather than a broader technology innovation theme.

What Does UFO Hold?

According to the fund's published holdings dated October 7, 2026, its ten largest positions included:

These holdings illustrate the variety of businesses included in a space-focused portfolio.

SpaceX and Rocket Lab provide exposure to launch and spacecraft activities.

AST SpaceMobile, Viasat, and Iridium operate in satellite communications markets.

Planet Labs focuses on Earth observation data.

Other holdings provide technologies or services that support space-related applications.

The portfolio is not equally weighted. Larger positions have a greater influence on overall fund performance.

For example, with SpaceX representing approximately 16.7% of the fund on the stated date, a substantial movement in SpaceX shares could materially affect UFO's value, even if other holdings remain relatively stable.

These weights are historical snapshots and should not be treated as current allocations without checking the latest fund disclosures.

What Are UFO's Main Advantages and Risks?

UFO provides exposure to multiple space-related companies through a single investment.

This can be useful for investors who want to participate in industry growth without selecting only one company.

However, the fund remains concentrated in a relatively specialized sector.

Several holdings may face similar risks, including high capital requirements, technological uncertainty, competition, and changes in government spending.

Diversification across space companies does not eliminate exposure to broader industry downturns.

ARK Space & Defense Innovation ETF (ARKX): A Broader Approach

The ARK Space & Defense Innovation ETF, trading under the ticker ARKX, is an actively managed fund focused on companies connected to space and defense innovation.

Originally launched in March 2021 as the ARK Space Exploration & Innovation ETF, the fund changed its name and investment policy in November 2025 to reflect its broader space and defense theme.

This distinction is important for investors researching space exploration ETFs.

ARKX is not limited to companies whose primary business is operating in space.

Its investment strategy can include businesses developing technologies that enable or benefit from innovation in aerospace, defense, autonomous systems, robotics, and related fields.

What Does ARKX Hold?

A published portfolio snapshot dated September 4, 2026, included the following major holdings:

The holdings demonstrate ARKX's broader investment approach.

SpaceX and Rocket Lab provide direct exposure to major space activities.

L3Harris, Kratos, and AeroVironment add exposure to aerospace and defense technologies.

Other companies contribute through technologies such as automation, computing, and advanced industrial systems.

However, investors should not assume that all revenue generated by these companies comes from space-related activities.

For example, a large technology company may participate in aerospace-related innovation while deriving most of its revenue from unrelated markets.

Consequently, ARKX may behave differently from a fund more narrowly focused on satellite operators and space infrastructure.

What Are ARKX's Main Advantages and Risks?

ARKX offers exposure to a broader range of technologies and businesses associated with space and defense innovation.

This can reduce dependence on a single commercial space segment.

However, the broader strategy also means investors may receive less concentrated exposure to the commercial space economy.

The fund's performance depends partly on portfolio management decisions and the market performance of businesses operating outside traditional space activities.

Investors should evaluate whether this wider investment mandate matches their expectations.

UFO vs. ARKX: Which Space ETF Is Better?

UFO and ARKX are two important choices for investors researching space-related ETFs, but neither is automatically the best option.

Their differences are primarily about investment focus and portfolio construction.

Fund information reflects published disclosures available in October 2026. Holdings and other portfolio characteristics can change.

When Might UFO Be More Suitable?

UFO may appeal to investors who want a fund whose investment strategy is more directly associated with the space economy.

Its holdings include businesses involved in satellite communications, launch services, and space-related infrastructure.

However, investors should examine the fund's actual revenue exposure and portfolio concentration rather than assuming every holding is a pure space company.

When Might ARKX Be More Suitable?

ARKX may appeal to investors who want exposure to space alongside defense, robotics, and other enabling technologies.

Its broader approach creates a different investment profile.

However, investors specifically seeking concentrated exposure to satellite operators and commercial space infrastructure may find that some ARKX holdings are less directly connected to their intended theme.

Does the Expense Ratio Decide Which Is Better?

Both funds report annual expense ratios of 0.75%, so their stated management costs are similar.

The more important differences are their holdings, investment strategies, concentration, and performance.

Investors should also consider trading spreads, fund liquidity, and how closely each portfolio matches the exposure they want.

Does a Space ETF Own SpaceX?

Yes, some space-focused ETFs hold publicly traded SpaceX shares.

Following SpaceX's June 2026 IPO, investors gained the ability to obtain direct exposure through its publicly traded Class A shares, while certain ETFs also added or maintained SpaceX positions.

Both UFO and ARKX have reported SpaceX among their major holdings.

However, buying an ETF that owns SpaceX is not equivalent to investing the entire amount directly in SpaceX.

Consider a simplified example.

If an ETF allocates 10% of its portfolio to SpaceX, a $1,000 investment in the ETF represents approximately $100 of indirect SpaceX exposure at that allocation.

The remaining $900 is invested in other holdings.

This calculation describes portfolio exposure, not a guarantee that the fund's price will move in a fixed proportion to SpaceX shares.

Portfolio weights can change as prices fluctuate or fund managers adjust positions.

Investors who want to compare publicly traded space businesses beyond SpaceX can read SpaceX Alternatives: Publicly Traded Space Companies to Watch, which examines companies involved in launch services, satellite communications, Earth observation, and space infrastructure.

How Much Does It Cost to Invest in a Space ETF?

The cost of investing in a space ETF includes more than the price of one share.

Investors should understand three main considerations.

Annual Expense Ratio

The expense ratio represents the annual operating costs of the fund as a percentage of its assets.

Both UFO and ARKX report expense ratios of 0.75%.

For a hypothetical $1,000 investment, a 0.75% annual expense ratio corresponds to approximately $7.50 per year, assuming the investment value remains constant.

The expense ratio is generally reflected in fund performance rather than charged as a separate annual bill to the investor.

Actual costs vary with the value of the investment.

Brokerage Trading Costs

Some brokerages offer commission-free trading for U.S.-listed ETFs.

However, investors should confirm the fees and conditions associated with their accounts.

Other charges may apply depending on the brokerage and transaction.

Bid-Ask Spread

ETFs trade on stock exchanges, where buyers and sellers may quote slightly different prices.

The difference between the highest available buying price and the lowest available selling price is called the bid-ask spread.

A wider spread can increase the effective cost of entering or exiting a position.

This is particularly relevant for funds with lower trading activity.

Are Space ETFs Safer Than Individual Space Stocks?

Space ETFs can reduce the company-specific risk associated with owning only one space stock.

For example, an investor holding shares in a single launch company is highly exposed to that company's financial results and operational developments.

An ETF holding multiple companies distributes the investment across several businesses.

However, diversification within one industry has limits.

Many space-related companies can be affected by the same developments, including:

• Rising financing costs.
• Reduced government spending.
• Slower satellite deployment.
• Competition in launch and communications markets.
• Lower investor appetite for speculative growth companies.
• Changes in technology or regulation.

An ETF concentrated in space companies can still experience substantial losses during an industry downturn.

Investors should distinguish between reducing dependence on one company and reducing overall portfolio risk.

A space ETF is not necessarily a substitute for a broadly diversified stock or bond portfolio.

How to Evaluate a Space ETF Before Buying

Choosing a space ETF requires examining more than historical returns or fund branding.

Several factors deserve attention.

Look at the Actual Holdings

The fund's portfolio reveals which businesses investors are buying.

Check whether its largest positions are directly involved in space activities or operate mainly in broader industries.

Examine Concentration

A fund may hold dozens of companies but allocate a substantial portion of its assets to only a few.

If one company represents a large percentage of the portfolio, its stock performance can significantly influence the ETF.

Compare Investment Strategies

An index-based fund follows predetermined selection rules, while an actively managed fund relies on portfolio management decisions.

Neither approach is inherently superior.

The appropriate choice depends on the investor's objectives and preferences.

Review Costs and Liquidity

Expense ratios affect long-term returns, while trading spreads can influence transaction costs.

Fund size and trading activity may also be relevant.

Understand What Drives Performance

A space ETF's returns may depend on satellite communications, aerospace manufacturing, defense spending, or technology stocks.

Investors should identify the actual economic drivers of the portfolio rather than assuming that all space-related funds respond to the same developments.

How Do You Buy a Space Exploration ETF?

Buying a space ETF is generally similar to purchasing an individual stock.

Most U.S. retail investors can access eligible exchange-traded funds through brokerage accounts.

The typical process involves opening and funding an account, searching for the ETF ticker, reviewing the fund's details, and placing an order.

Investors can usually choose between market orders and limit orders.

A market order prioritizes execution at available prices, while a limit order allows the investor to specify the maximum price they are willing to pay.

Before submitting an order, investors should verify the fund name, ticker, investment amount, and transaction details.

It is also important to read the fund's latest prospectus and holdings information.

For a more complete explanation of brokerage accounts, order types, and investment research, see How to Invest in Space Stocks: A Practical Guide.

Can Space ETFs Be Good Long-Term Investments?

Space ETFs may appeal to investors who believe demand for satellite connectivity, launch services, Earth observation, and other space-related technologies will expand over time.

The industry has several potential growth drivers.

Satellite networks can extend communications coverage.

Earth observation systems can provide data for businesses and government agencies.

Launch infrastructure supports the deployment and maintenance of orbital systems.

National security programs can create demand for advanced aerospace capabilities.

However, growing demand for space services does not guarantee strong investment returns.

Companies may face intense competition, high development costs, financing requirements, and uncertain profitability.

ETF performance also depends on the valuations of the underlying stocks.

If investors pay high prices based on optimistic growth expectations, even successful industry expansion may produce disappointing returns.

Long-term investors should therefore consider the financial strength of the underlying businesses and the prices reflected in the portfolio.

A promising industry is not automatically an attractively valued investment.

Which Space Exploration ETF Should Investors Choose?

For investors specifically seeking exposure to the commercial space economy, UFO offers a portfolio centered on companies involved in space-related activities.

For those who prefer a broader investment theme combining space, defense, and enabling technologies, ARKX provides a different approach.

Both funds offer exposure to important companies in the industry, including SpaceX and Rocket Lab, but their holdings and allocations are not identical.

Neither ETF guarantees superior returns, and both remain exposed to stock market volatility.

The most useful approach is to compare their current holdings, concentration, investment strategies, and costs before deciding whether either belongs in a portfolio.

Ultimately, the best space exploration ETF is not necessarily the one with the strongest recent performance or the most recognizable companies.

It is the fund whose underlying businesses, risk characteristics, and investment strategy most closely match the investor's objectives.

Financial disclaimer: This article is for informational and educational purposes only and does not constitute financial or investment advice. ETFs and individual stocks involve market risk, including potential loss of capital. Investors should review current fund documents and consider their financial circumstances before making investment decisions.