The Complete Guide to Space ETFs: ARKX, UFO, ITA and Beyond

The space economy is projected to reach $1.8 trillion by 2035, and exchange-traded funds have become the most accessible way for investors to gain diversified exposure to this growth. But not all space ETFs are created equal. Some focus on pure-play space companies, others blend aerospace and defense, and a few take speculative bets on emerging space technologies.

This guide breaks down every space-focused ETF available in 2026 (their holdings, costs, performance, and strategic fit) so you can make an informed allocation decision.

Why Space ETFs Matter

Updated August 2026: When this guide was first published, its biggest caveat was that SpaceX, the industry's most valuable company, was private and unreachable through any fund. That changed on June 12, 2026, when SpaceX listed on Nasdaq as SPCX in the largest IPO in history (~$1.78 trillion at pricing; ~$1.84 trillion today). Expect index and ETF compositions to evolve around it; check current fund holdings before buying. See SPCX Since the IPO for the full analysis.

Investing in individual space companies carries concentrated risk. Many publicly traded space companies are small-caps or mid-caps with volatile earnings. The SPAC class of 2021 taught investors a painful lesson about speculative single-stock bets: names like Astra and Momentus declined 80-90% from their peaks.

Space ETFs solve this by spreading risk across dozens of holdings while still capturing the sector's structural growth. They also provide exposure to companies that are difficult to buy individually in certain brokerage accounts, and they rebalance automatically as the industry evolves.

ARKX: ARK Space Exploration & Innovation ETF

Issuer: ARK Invest
Inception: March 2021
Expense Ratio: 0.75%
AUM: ~$350 million
Strategy: Actively managed, thematic growth

ARKX is Cathie Wood's bet on the convergence of space technology and innovation. As an actively managed fund, ARK's team selects holdings based on their assessment of disruptive potential rather than tracking an index.

Top Holdings

• Rocket Lab (RKLB): ~8% of fund. ARK has been a consistent buyer of Rocket Lab shares, reflecting conviction in the Electron/Neutron strategy.
• Kratos Defense (KTOS): ~7%. Satellite communications and unmanned systems for defense.
• Iridium Communications (IRDM): ~6%. The only LEO constellation with global voice and data coverage outside Starlink.
• Trimble (TRMB): ~5%. GPS-enabled positioning technology for construction, agriculture, and transportation.
• L3Harris Technologies (LHX): ~5%. Space-based ISR, missile warning satellites, and ground systems.

What Makes ARKX Different

ARKX's active management means the portfolio shifts as ARK's conviction changes. The fund has historically included non-obvious picks: companies that ARK views as space-adjacent, like 3D printing firms and drone manufacturers. This broader definition of "space" is either a feature or a bug depending on your perspective. If you want pure space exposure, some holdings may feel tangential. If you want exposure to the broader innovation ecosystem that enables space, ARKX captures that.

Performance Note

ARKX launched near the peak of the growth stock rally in 2021 and suffered alongside the broader ARK family during the 2022 correction. Since then, performance has recovered meaningfully as space companies have matured from speculative stories into revenue-generating businesses. The fund's active management has allowed it to increase positions in outperformers like Rocket Lab while trimming laggards.

UFO: Procure Space ETF

Issuer: Procure ETFs
Inception: April 2019
Expense Ratio: 0.75%
AUM: ~$35 million
Strategy: Index-based, pure-play space focus

UFO tracks the S-Network Space Index and was the first space-dedicated ETF on the market. Its index methodology requires that constituent companies derive at least 50% of revenue from space-related activities, making it one of the purest space plays available.

Top Holdings

• SES S.A.: ~6%. Luxembourg-based GEO and MEO satellite operator, major player in video distribution and government communications.
• Eutelsat Group: ~6%. Following the OneWeb merger, Eutelsat operates both GEO and LEO satellite constellations.
• Rocket Lab (RKLB): ~5%. Small launch and space systems.
• Iridium Communications (IRDM): ~5%. LEO satellite communications.
• Planet Labs (PL): ~4%. Earth observation constellation operator.

What Makes UFO Different

UFO's purity is its selling point. The 50% revenue threshold means you are buying companies that are genuinely in the space business, not defense conglomerates or tech firms with a small space division. The trade-off is a smaller universe of eligible stocks and lower AUM, which can mean wider bid-ask spreads. UFO also carries meaningful international exposure, with significant allocations to European and Asian satellite operators.

ITA: iShares U.S. Aerospace & Defense ETF

Issuer: BlackRock (iShares)
Inception: May 2006
Expense Ratio: 0.40%
AUM: ~$6.5 billion
Strategy: Index-based, U.S. aerospace and defense sector

ITA is not a pure space ETF; it is an aerospace and defense fund. But it provides substantial space exposure through the major defense primes and aerospace manufacturers that dominate government space contracts.

Top Holdings

• RTX Corporation (RTX): ~18%. Pratt & Whitney engines, Raytheon missiles and sensors, Collins Aerospace avionics.
• Boeing (BA): ~7%. SLS manufacturer, Starliner operator, satellite systems.
• Lockheed Martin (LMT): ~6%. Space division builds GPS III satellites, Orion capsule, missile warning systems.
• Northrop Grumman (NOC): ~5%. James Webb Space Telescope prime contractor, solid rocket motors, space logistics vehicles.
• General Dynamics (GD): ~5%. Gulfstream jets, submarine construction, IT services.

What Makes ITA Different

ITA offers the lowest expense ratio of any ETF on this list (0.40%) and the highest AUM ($6.5B), which means tight spreads and deep liquidity. It is the institutional choice for space-adjacent exposure. The drawback is dilution: many holdings derive most of their revenue from traditional defense and commercial aviation, not space. You are buying space exposure bundled with fighter jet and missile programs. For investors who view defense and space as a combined thesis (especially given the Space Force buildout and Golden Dome program), ITA captures both tailwinds.

ROKT: SPDR S&P Kensho Final Frontiers ETF

Issuer: State Street (SPDR)
Inception: October 2018
Expense Ratio: 0.45%
AUM: ~$25 million
Strategy: Index-based, AI-selected space and deep-sea exploration

ROKT uses S&P's Kensho methodology, which applies natural language processing to company filings, patents, and earnings transcripts to identify companies involved in space and deep-sea exploration. This AI-driven selection process surfaces companies that traditional sector classifications might miss.

Top Holdings

• Planet Labs (PL): Daily Earth observation imagery and geospatial analytics.
• Virgin Galactic (SPCE): Suborbital space tourism (currently between vehicles, commercial flights are paused until its Delta-class spaceplanes enter service, expected 2026-27).
• Aerojet Rocketdyne: Rocket propulsion systems, now part of L3Harris.
• BWX Technologies (BWXT): Nuclear propulsion and power for space missions.
• Kratos Defense (KTOS): Satellite ground systems and unmanned platforms.

What Makes ROKT Different

The Kensho NLP methodology means ROKT can identify space-relevant companies that human analysts might overlook: firms whose space involvement is mentioned in filings but not reflected in their sector classification. The deep-sea exploration component is unique but adds holdings that have nothing to do with space. ROKT's small AUM is a concern for liquidity-sensitive investors.

XAR: SPDR S&P Aerospace & Defense ETF

Issuer: State Street (SPDR)
Inception: September 2011
Expense Ratio: 0.35%
AUM: ~$2 billion
Strategy: Equal-weighted index, U.S. aerospace and defense

XAR is ITA's equal-weighted counterpart. While ITA concentrates in mega-cap defense primes, XAR gives equal weight to each constituent, providing more exposure to small-cap and mid-cap space companies.

Top Holdings

Because XAR is equal-weighted and rebalances quarterly, no single holding dominates. This means companies like Rocket Lab, BlackSky, Spire Global, and Momentus carry the same weight as Lockheed Martin and Boeing. For space investors, this is significant: the equal-weight approach gives emerging space companies far more influence on fund performance than they receive in cap-weighted funds.

What Makes XAR Different

The lowest expense ratio on this list (0.35%) combined with equal weighting makes XAR a compelling choice for investors who believe small-cap space companies will outperform the defense primes. Historically, XAR has shown higher volatility than ITA but has also captured more upside during space-sector rallies.

Space ETF Comparison Table

ETF	Expense Ratio	AUM	Holdings	Strategy	Space Purity
ARKX	0.75%	~$350M	35-50	Active, thematic	Medium
UFO	0.75%	~$35M	30-35	Index, pure-play	High
ITA	0.40%	~$6.5B	35-40	Index, cap-weighted	Low
ROKT	0.45%	~$25M	25-30	Index, NLP-selected	Medium
XAR	0.35%	~$2B	30-35	Index, equal-weight	Low

How to Choose the Right Space ETF

The right ETF depends on your investment thesis and risk tolerance:

For Maximum Space Purity

Choose UFO. It has the strictest revenue threshold for space-related activities. You are buying companies that live and breathe space, not defense conglomerates with a space division. Accept the trade-offs: lower liquidity, higher expense ratio, and international currency exposure.

For Active Management and Thematic Conviction

Choose ARKX. If you trust ARK's research team to identify the winners in the space innovation ecosystem, ARKX offers concentrated bets that an index cannot make. The 0.75% expense ratio is the price of active selection. ARKX is best suited for investors with a 5+ year horizon who believe in the ARK thesis.

For Institutional-Grade Exposure with Low Costs

Choose ITA. With $6.5B in AUM, a 0.40% expense ratio, and deep liquidity, ITA is the default choice for large allocations and tax-sensitive accounts. You sacrifice space purity for execution quality and cost efficiency.

For Small-Cap Space Tilts

Choose XAR. The equal-weight methodology gives emerging space companies outsized influence relative to their market cap. If you believe the next decade's space winners are today's small-caps, XAR captures that thesis at 0.35%.

For AI-Driven Discovery

Choose ROKT. The Kensho NLP approach surfaces non-obvious space plays. But the deep-sea exploration component and low AUM make this a niche choice: consider it a complement to a core space ETF position, not a replacement.

Building a Space ETF Portfolio

Many sophisticated space investors combine multiple ETFs to build their ideal exposure profile. A common approach:

• Core (60%): ITA or XAR for broad, low-cost aerospace and defense exposure
• Satellite (25%): UFO or ARKX for pure-play or thematic space concentration
• Tactical (15%): Individual space stocks (RKLB, IRDM, PL) for high-conviction positions

This layered approach captures the sector's structural growth through the core allocation while allowing targeted bets through satellite and tactical positions.

Risks to Consider

Space ETFs carry sector-specific risks that broad market funds do not:

• Launch failures: A single anomaly can move multiple holdings simultaneously.
• Government budget dependency: Many space companies rely on NASA, Space Force, and NRO contracts. Budget sequestration or political shifts can affect the entire sector.
• SpaceX concentration. Now that SpaceX trades publicly as SPCX (~$1.84 trillion), the opposite problem applies: any fund that holds it at market weight becomes dominated by a single name, and any fund that excludes it misses most of the sector's market value. SpaceX's pricing power also pressures competitors' margins.
• Regulatory risk: Changes to debris mitigation rules, spectrum allocation, or export controls can affect satellite operators and manufacturers.
• Concentration: The publicly traded space universe is still relatively small. Multiple ETFs hold overlapping positions in names like Rocket Lab, Iridium, and L3Harris.

The Bottom Line

Space ETFs have matured significantly since ARKX and UFO launched in 2019-2021. The sector is no longer driven purely by speculative narratives: companies like Rocket Lab, Iridium, and Planet Labs are generating real revenue and approaching profitability. The defense primes are winning multi-billion-dollar space contracts through Golden Dome, SDA Tranche programs, and next-generation missile warning systems.

For investors who believe the space economy's trajectory from $630 billion to $1.8 trillion is structural rather than speculative, ETFs remain the most efficient way to build diversified exposure. The key is matching your ETF selection to your thesis: pure space, broad aerospace, active management, or equal-weight tilts.

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