Space ETFs Compared: What They Hold and Who They're For

The best space ETF depends on what investors want to own. The Procure Space ETF (UFO), ARK Space & Defense Innovation ETF (ARKX), and SPDR S&P Kensho Final Frontiers ETF (ROKT) offer different approaches to investing in space-related businesses.

Although these funds are associated with the space economy, they do not follow identical investment strategies. Their portfolios may include satellite communications providers, rocket manufacturers, aerospace contractors, defense companies, and businesses developing technologies used in other industries.

These differences matter because two ETFs marketed as space investments can deliver very different results.

Some investors want direct exposure to commercial space companies. Others prefer established aerospace businesses or a broader combination of space, defense, and advanced technologies.

The investment landscape has also evolved with SpaceX's public listing in June 2026, making direct ownership of its publicly traded shares another consideration for investors comparing space-focused funds.

However, investors should not assume that every space ETF holds SpaceX or provides meaningful exposure to the company's operations.

This guide compares UFO, ARKX, and ROKT, explains their investment strategies, examines their potential advantages and limitations, and helps retail investors understand which type of fund may suit different objectives.

For a broader introduction to the industry's investment opportunities, read Is Investing in Space a Good Idea? Opportunities and Risks for Retail Investors.

What Are the Main Space ETFs?

Three U.S.-listed ETFs illustrate the different ways investors can obtain exposure to space-related businesses.

Note: The expense ratios shown are historical reference figures from the article's source material, not independently verified current October 2026 rates. Investors should consult the latest fund prospectuses before making investment decisions.

The primary difference between these ETFs is not simply their cost. It is the type of businesses they are designed to own.

UFO emphasizes companies participating in the commercial space economy.

ARKX combines space-related opportunities with defense and advanced technology investments.

ROKT follows a broader frontier-exploration approach that can include industries beyond space.

Understanding these distinctions is more useful than choosing an ETF based solely on its name or recent performance.

What Does the Procure Space ETF (UFO) Hold?

The Procure Space ETF is designed to provide exposure to businesses involved in space-related industries.

Its investment strategy focuses on companies associated with activities such as satellite communications, launch services, Earth observation, and infrastructure supporting space operations.

Examples of companies relevant to this investment theme include:

• Rocket Lab: Launch services, spacecraft manufacturing, and space systems.
• AST SpaceMobile: Satellite-based cellular broadband connectivity.
• Planet Labs: Earth observation imagery and data services.
• Iridium Communications: Satellite communications networks and services.
• Viasat: Satellite connectivity and communications infrastructure.
• SpaceX: Launch services, spacecraft systems, and satellite connectivity, subject to the fund's actual holdings and eligibility rules.

These companies illustrate the businesses associated with commercial space investing. They should not be interpreted as a verified list of UFO's current portfolio holdings or weights.

UFO's investment approach can provide exposure to companies whose commercial activities are closely connected to space infrastructure.

However, the fund may also include businesses whose products and services support space-related activities without being exclusively focused on the space industry.

Investors should therefore examine the percentage of each company's revenue associated with space operations.

Who Might Consider UFO?

UFO may appeal to investors seeking relatively focused exposure to the commercial space economy.

Its investment universe includes businesses that may benefit from growing demand for satellite communications, space infrastructure, launch services, and related technologies.

However, focused exposure can also increase risk.

Some commercial space companies operate in capital-intensive markets and may require substantial investment before generating sustainable profits.

Share prices can be sensitive to financing announcements, technological milestones, competition, and changes in investor expectations.

UFO may therefore be more suitable for investors who understand the volatility associated with a specialized investment theme.

What Does ARK Space & Defense Innovation ETF (ARKX) Hold?

ARKX is an actively managed ETF focused on space, defense, and related innovation.

Unlike an index-based ETF, an actively managed fund allows its portfolio managers to select investments and adjust positions according to their assessment of business opportunities.

An important distinction is that ARKX is not exclusively a space exploration fund.

In November 2025, the fund changed its name from ARK Space Exploration & Innovation ETF to ARK Space & Defense Innovation ETF, reflecting a broader investment mandate.

Its investment universe can include companies developing technologies associated with:

• Reusable rockets and spacecraft.
• Satellite communications and infrastructure.
• Defense systems and autonomous technologies.
• Robotics and unmanned systems.
• Artificial intelligence and advanced computing.
• Technologies with applications across space and defense markets.

Examples of companies relevant to these investment themes include SpaceX, Rocket Lab, L3Harris Technologies, Kratos Defense & Security Solutions, Amazon, Nvidia, and Alphabet.

These examples illustrate the breadth of ARKX's investment mandate. They are not a verified list of current holdings.

This broader strategy means ARKX may behave differently from an ETF concentrated primarily on satellite operators or launch providers.

Its performance may be influenced by developments in defense spending, artificial intelligence, robotics, and other technology markets.

Who Might Consider ARKX?

ARKX may appeal to investors interested in the intersection of space, defense, and technological innovation.

Its active management allows the portfolio to evolve as managers identify new opportunities.

However, this flexibility introduces additional considerations.

The fund's performance depends partly on the investment decisions of its managers, including company selection, position sizing, and portfolio adjustments.

Investors should also recognize that owning ARKX does not necessarily provide concentrated exposure to commercial space activities.

Someone primarily interested in satellite broadband or rocket launch companies may find that a significant portion of the portfolio is invested in other industries.

What Does SPDR S&P Kensho Final Frontiers ETF (ROKT) Hold?

ROKT follows an index-based investment strategy associated with frontier exploration.

Its investment universe extends beyond commercial space businesses.

The fund can include companies involved in aerospace, space-related technologies, and other exploration activities.

Examples of businesses relevant to its broader investment universe include:

• Iridium Communications: Satellite communications services.
• Lockheed Martin: Aerospace, defense, and space programs.
• RTX: Aerospace and defense technologies.
• Teledyne Technologies: Sensors, imaging, and industrial technologies.
• Ducommun: Aerospace and defense components.
• Oceaneering International: Underwater engineering and industrial technologies.
• Forum Energy Technologies: Equipment associated with energy and subsea operations.

These examples describe businesses relevant to frontier-exploration investing rather than confirmed current ROKT holdings.

The distinction is important because not every company associated with exploration operates in the commercial space economy.

Some companies derive much of their revenue from established industrial or defense markets.

As a result, ROKT's performance can be influenced by economic developments that have relatively little connection to rocket launches or satellite demand.

Who Might Consider ROKT?

ROKT may appeal to investors interested in a broader combination of aerospace, industrial, and exploration-related businesses.

Its historically lower expense ratio may also be relevant when comparing long-term investment costs.

However, a lower fee does not automatically make an ETF the best choice.

Investors seeking concentrated exposure to commercial satellite networks or launch providers may find that ROKT's broader investment universe does not match their objectives.

The appropriate choice depends on what investors want to own, not simply which fund charges the lowest annual fee.

Which Space ETF Has the Most Direct Exposure to the Space Economy?

Based on their stated investment approaches, UFO generally provides the clearest emphasis on commercial space businesses.

ARKX offers a broader combination of space, defense, and advanced technology exposure.

ROKT includes space-related activities within a wider frontier-exploration strategy.

This comparison describes the funds' investment strategies rather than fixed portfolio allocations.

Actual holdings and position weights can change.

Investors interested specifically in commercial space operations may want to examine UFO first.

Those seeking exposure to space-related innovation alongside defense technologies may find ARKX more relevant.

Investors interested in a broader mix of exploration and established aerospace businesses may want to examine ROKT.

These distinctions do not predict which ETF will generate the highest returns.

Do Any Space ETFs Own SpaceX?

SpaceX's public listing in June 2026 changed the ways investors can obtain exposure to the company.

Before the IPO, investment access generally involved private-market arrangements, specialized funds, or indirect exposure through other companies.

Following the listing, SpaceX Class A shares began trading publicly under the ticker SPCX.

This created the possibility for eligible ETFs to acquire publicly traded SpaceX shares, subject to their investment mandates and portfolio decisions.

However, investors should not assume that UFO, ARKX, or ROKT automatically owns SpaceX.

Whether a fund holds SPCX depends on its investment rules, portfolio construction, and most recently disclosed holdings.

Before purchasing a space ETF for SpaceX exposure, investors should ask:

• Does the fund currently hold SPCX shares?
• What percentage of its portfolio is invested in SpaceX?
• Has the allocation changed since the IPO?
• Does the fund have position-size or eligibility restrictions?
• How much of the fund's performance depends on its other holdings?

Even when an ETF holds SpaceX, buying the ETF is different from directly purchasing SPCX shares.

The investor owns shares of a fund containing multiple securities.

SpaceX could perform strongly while the ETF declines because other holdings experience losses.

Conversely, an ETF could perform well even if SpaceX shares decline.

Investors seeking concentrated exposure to SpaceX should distinguish direct stock ownership from diversified fund exposure.

How Much Do Space ETFs Cost?

ETF expenses are important because they reduce the investment returns shareholders ultimately receive.

The annual expense ratio represents the fund's operating expenses as a percentage of its assets.

Consider a hypothetical investment of $10,000.

These calculations use historical reference rates for illustration, not verified current expense ratios. Actual costs depend on current fund fees and the value of the investment.

The expense ratio is generally reflected in the fund's net asset value rather than charged as a separate annual bill.

Investors may also face other expenses.

• Brokerage commissions.
• Bid-ask spreads.
• Currency conversion costs.
• Differences between market price and net asset value.
• Applicable taxes.

The bid-ask spread is the difference between the price buyers are willing to pay and the price sellers are asking.

For ETFs with limited trading activity, this spread can be relatively important.

A fund with a lower annual expense ratio may still involve higher transaction costs if its shares are less liquid.

Investors should therefore evaluate both recurring expenses and the costs of buying and selling shares.

Are Space ETFs Safer Than Individual Space Stocks?

Space ETFs can reduce company-specific risk by spreading investments across multiple businesses.

However, they are not necessarily low-risk investments.

Consider an investor who purchases shares in one satellite communications company.

If that business experiences a major technical failure or unexpected financing requirement, the investor's entire position may be affected.

An ETF holding several companies may experience a smaller impact from that single event.

However, all its holdings may still be exposed to broader industry risks.

These include:

• High capital requirements for rockets, satellites, and infrastructure.
• Technical failures and commercial delays.
• Competition between launch and satellite providers.
• Dependence on government contracts.
• Higher interest rates and financing costs.
• Valuations based on uncertain future growth.
• Shareholder dilution among underlying companies.
• Concentration in a small number of major holdings.

Diversification also depends on portfolio weights.

An ETF holding 30 companies may still be highly concentrated if a few businesses represent a substantial percentage of its assets.

Investors should examine the largest holdings rather than relying solely on the total number of companies.

ETFs can help manage certain risks, but they cannot eliminate the possibility of substantial investment losses.

Why Can Two Space ETFs Perform Very Differently?

Two ETFs can both be described as space investments while producing very different returns.

The main explanation is that they own different companies in different proportions.

Imagine a period when emerging satellite companies outperform established aerospace contractors.

An ETF with substantial satellite exposure may benefit more than a fund concentrated in diversified industrial businesses.

The opposite can happen when investors become concerned about financing costs or speculative valuations.

Established companies with more predictable earnings may perform differently from businesses still investing heavily in development.

Active management introduces another source of variation.

ARKX managers can adjust holdings based on their investment decisions, while index-based funds generally follow their respective index methodologies.

The inclusion or exclusion of a major publicly traded company such as SpaceX can also affect relative performance, depending on its portfolio weight.

For these reasons, recent performance alone is not sufficient to determine which space ETF is best.

Investors should examine the underlying companies and the reasons for historical returns.

How Should You Compare Space ETFs Before Buying?

1. Examine the Actual Holdings

Start by reviewing the largest positions in each fund.

Determine which companies generate meaningful revenue from space-related activities and which participate only indirectly.

An ETF holding several well-known technology businesses may provide less concentrated commercial space exposure than its name suggests.

Investors specifically interested in SpaceX should check whether the fund owns SPCX and the size of that position.

2. Understand the Investment Strategy

Determine whether the ETF follows an index or uses active management.

Index-based funds generally follow published selection and weighting rules.

Actively managed funds allow managers greater discretion in selecting and adjusting investments.

Neither structure guarantees better results.

3. Check Portfolio Concentration

Review how much of the fund is allocated to its largest holdings.

A portfolio containing numerous companies can still be highly concentrated.

Large positions increase the impact of individual company developments on overall fund performance.

4. Compare Fees and Liquidity

Evaluate the latest expense ratio, trading activity, and bid-ask spread.

Recurring costs can reduce long-term compounded returns.

Liquidity also affects how efficiently investors can enter or exit positions.

5. Evaluate Financial Risk

Examine the financial condition of the underlying companies.

A fund concentrated in businesses with negative cash flow and substantial development spending may be more sensitive to financing conditions.

Funds holding established businesses may have different financial characteristics, but they remain exposed to valuation and market risks.

6. Review Portfolio Overlap

Owning multiple space ETFs does not automatically create substantial additional diversification.

Two funds may hold many of the same companies.

If their largest positions overlap, purchasing both can increase exposure to the same businesses.

Investors should compare holdings before assuming that multiple ETFs provide independent sources of return.

7. Check Current Fund Documentation

ETF holdings, investment objectives, expense ratios, and fund names can change.

Investors should review the latest official prospectuses and portfolio disclosures.

This is especially important when evaluating whether an ETF currently holds SpaceX shares or has changed its investment strategy.

Should You Buy a Space ETF or Build Your Own Space Stock Portfolio?

Investors can choose between purchasing a space ETF and constructing a portfolio of individual space-related companies.

Each approach has advantages and limitations.

Advantages of Space ETFs

• Exposure to multiple companies through one investment.
• Less dependence on a single company's performance.
• Portfolio management according to a defined investment strategy.
• Convenient access through eligible brokerage accounts.

However, investors have limited control over the individual holdings.

They cannot generally remove an unwanted company from an ETF or independently adjust its portfolio weight.

Advantages of Individual Space Stocks

• Direct exposure to selected companies.
• Greater control over position sizes.
• Ability to focus on preferred business models.
• Flexibility to exclude companies that do not meet investment criteria.

However, constructing an individual stock portfolio requires additional research and ongoing monitoring.

Investors must evaluate financial statements, competitive positions, valuations, capital requirements, and company-specific risks.

SpaceX's public listing has expanded the range of individual space-related companies available to eligible investors.

But adding a prominent company to a portfolio does not automatically create diversification or improve expected returns.

For a broader explanation of investment methods, read How to Invest in Space: Stocks, ETFs and Other Ways to Get Exposure.

For a closer look at individual companies and their business models, read Space Stocks to Watch: A Guide to the Companies Leading the Sector.

Which Space ETF Is Best for Long-Term Investors?

There is no universally best space ETF for long-term investors.

The appropriate choice depends on the type of exposure an investor wants and the financial risks they are prepared to accept.

UFO may be more relevant for investors seeking commercial space exposure, particularly satellite communications and businesses directly involved in space operations.

ARKX may appeal to investors interested in space and defense innovation, including technologies with applications across multiple industries.

ROKT may suit investors seeking broader frontier-exploration exposure, including established aerospace and industrial businesses.

However, these descriptions do not establish which fund will generate the strongest future returns.

Long-term performance depends on the underlying companies, their financial results, portfolio composition, market valuations, fund expenses, and broader economic conditions.

Investors should also consider whether a specialized space ETF fits within their overall portfolio.

Even a fund holding numerous companies can remain concentrated in a narrow investment theme.

A diversified portfolio across industries and asset classes may reduce dependence on the success of the space economy alone.

Frequently Asked Questions About Space ETFs

What is the best space ETF?

There is no single best choice for every investor. UFO, ARKX, and ROKT follow different strategies. Investors should compare their current holdings, fees, concentration, and investment objectives.

Which ETF focuses most directly on commercial space?

Based on its stated investment approach, UFO generally has the clearest emphasis on businesses connected to commercial space activities. Actual portfolio exposure should be confirmed using current holdings.

Is ARKX still a space exploration ETF?

ARKX broadened its investment mandate and changed its name to ARK Space & Defense Innovation ETF in November 2025. Its strategy includes defense and related technologies alongside space-related opportunities.

Does ROKT invest only in space companies?

No. ROKT follows a broader frontier-exploration strategy that can include businesses outside the commercial space economy.

Do space ETFs own SpaceX stock?

Some funds may be eligible to hold publicly traded SpaceX shares, but investors must check current portfolio disclosures. A space-focused investment strategy does not guarantee ownership of SPCX.

Are space ETFs safer than individual stocks?

They can reduce company-specific risk through diversification, but they remain exposed to sector-wide declines, valuation changes, and the financial risks of their underlying holdings.

Can space ETFs lose money?

Yes. ETF share prices can decline substantially, particularly when underlying companies experience financial problems or investors reduce their exposure to growth-oriented industries.

Are space ETFs suitable for beginners?

They may provide a simpler way to access multiple companies, but beginners should understand their concentration, investment strategies, costs, and risks before buying.

Should investors buy more than one space ETF?

That depends on portfolio objectives and holdings overlap. Owning multiple funds may provide limited additional diversification if they invest in many of the same companies.

Final Thoughts: Which Space ETF Should Investors Choose?

UFO, ARKX, and ROKT offer different ways to participate in businesses associated with space and exploration.

UFO emphasizes commercial space activities, ARKX combines space with defense and advanced innovation, and ROKT provides broader frontier-exploration exposure.

These differences affect portfolio composition, investment risk, and potential performance.

The public listing of SpaceX has also changed the investment landscape by allowing eligible investors to compare direct SPCX ownership with exposure through ETFs that may include the company.

However, investors should not assume that a fund owns SpaceX or that its portfolio is concentrated in commercial space merely because it uses space-related terminology.

The most important steps are to examine current holdings, understand the investment strategy, compare expenses, assess financial risks, and determine whether the fund fits the investor's broader portfolio.

The best space ETF is not necessarily the fund with the most recognizable name or the strongest recent performance. It is the one that provides the intended investment exposure at a cost and level of risk the investor understands.

Disclaimer: This article is for informational and educational purposes only and does not constitute financial or investment advice. ETF holdings, fees, and strategies may change. All investments involve risk, including the potential loss of principal. Investors should review current fund documentation and consider their financial circumstances before making investment decisions.