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MARS ETF Explained: Returns, Expense Ratio, Holdings, and Alternative ETFs

Updated July 2, 2026 · First published July 2, 2026

The Roundhill Space & Technology ETF (MARS) is an actively managed space-themed ETF that invests across the global space economy value chain, including satellite communications, rocket launches, and space-based data. It is designed for investors who want to capture the growth outlook of the space industry and related companies in a single product.

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🏷️

What Is the Roundhill Space & Technology ETF?

It is an actively managed ETF that provides exposure to companies across the global space economy value chain, including satellite communications, rocket launch services, and space-based data. The portfolio team actively selects companies expected to benefit from the commercialization of low-Earth orbit and the growth of the space industry.

It is well suited to growth-oriented investors who want to bet on the long-term expansion of the space and aerospace industry while leaving individual stock selection to the portfolio managers.

The ETF is actively managed by Roundhill.

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How Does the Roundhill Space & Technology ETF Invest?

ItemDetails
Tracking IndexActively managed (does not track a specific index)
Management StyleActive (stock selection)
Rebalancing CycleAt the portfolio managers' discretion
Dividend ScheduleNo distributions paid
Total Expense Ratio0.75%

The portfolio managers actively select and include companies across the space economy value chain, spanning satellite communications, launch vehicles, space data, and aerospace. It uses an active structure that does not track a specific index, allowing the portfolio to be adjusted in line with the commercialization of space.

  • Active space theme that does not track a specific index
  • Aimed at pure-play exposure across the space value chain
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Roundhill Space & Technology ETF Size and Cost (AUM and Expense Ratio)

Assets under management (AUM) stand at $48.6M, and the total expense ratio is 0.75% per year.

Its expense ratio is higher than that of broad core ETFs due to the narrower theme and the active structure, but it offers a differentiated option for investors seeking concentrated exposure to the space industry.

Roundhill Space and Technology ETF Performance and Flows

The space theme has gained attention on expectations of expanded commercial launches and satellite demand, but has shown a volatile trajectory shaped by individual company earnings and investor sentiment. Short-term swings have been wide.

As a relatively new category, space-themed ETFs see inflows and outflows that react sensitively to news and commercial space events, and tend to attract capital when the market's risk appetite is strong.

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Roundhill Space & Technology ETF: Strengths and Weaknesses

Pure-play exposure across the space economy and active stock selection are the strengths, while high volatility from thematic concentration and a relatively high expense ratio are the weaknesses.

💪 Key Strengths

Pure-Play Space Exposure
Provides concentrated exposure across the space value chain, including satellites, launch, and space data.
Active Stock Selection
The portfolio managers include growth companies at their discretion, without being tied to an index.
Emerging Growth Theme
Offers access to the long-term structural growth driven by the commercialization of low-Earth orbit.

⚠️ Points to Watch

High Volatility
The thematic focus and concentration in small- and mid-cap stocks lead to wider swings than the broader market.
High Expense Burden
The active structure results in a higher expense ratio than broad core ETFs.
No Distributions
There are no payouts, making it unsuitable for investors seeking income.
Currency Exposure
Won-based investors also bear the impact of dollar exchange rate fluctuations.
Roundhill Space and Technology ETF Alternatives and Related Products

The ETFs shown in the table, BAI, AIQ, and CHAT, invest broadly across artificial intelligence and technology themes. Compared with these, MARS is more narrowly focused on the space industry, with a different profile and fee structure. For more direct space-focused substitutes, consider space-specific themed products such as UFO, ARKX which invests in space and defense innovation, and ROKT, a space exploration theme. For exposure centered on large-cap aerospace and defense names, a defense ETF such as ITA is also worth reviewing alongside these.

Roundhill Space & Technology ETF Investor Checklist

Here are the key points to review before investing in MARS. The growth potential of the space theme is significant, but volatility, costs, and the absence of income are factors that should be examined carefully in advance, so it is advisable to go through each item below.

CheckpointWhat to ConfirmCurrent Status
🚀 Thematic ConcentrationWhether you can tolerate the space industry tilt and its volatilityVolatility tends to be high
💵 Expense RatioThe long-term impact of the active management feeSomewhat elevated level
💧 LiquidityTrading volume of this new, small ETFNeeds to be checked
💱 CurrencyImpact on won-denominated returnsNo currency hedge applied

The space theme is an early-stage industry with limited visibility into individual company results, and short-term swings can be large as investor sentiment shifts. Because of its concentrated nature, drawdowns can deepen during market corrections.

It is a satellite-style holding suited to investors who want to actively bet on the long-term growth of the space economy. However, given its high volatility and expense ratio, it is preferable to approach it as a complementary allocation rather than a core holding.

1-Year Price Performance
Dividend & Yield
No dividend or yield data available
52-Week Price Range
$25
Low $22 High $46
vs. low +12.83% vs. high -45.23%
⚔️

Roundhill Space & Technology ETF: Strengths and Weaknesses

Pure-play exposure across the space economy and active stock selection are the strengths, while high volatility from thematic concentration and a relatively high expense ratio are the weaknesses.

💪 Key Strengths

Pure-Play Space Exposure
Provides concentrated exposure across the space value chain, including satellites, launch, and space data.
Active Stock Selection
The portfolio managers include growth companies at their discretion, without being tied to an index.
Emerging Growth Theme
Offers access to the long-term structural growth driven by the commercialization of low-Earth orbit.

⚠️ Points to Watch

High Volatility
The thematic focus and concentration in small- and mid-cap stocks lead to wider swings than the broader market.
High Expense Burden
The active structure results in a higher expense ratio than broad core ETFs.
No Distributions
There are no payouts, making it unsuitable for investors seeking income.
Currency Exposure
Won-based investors also bear the impact of dollar exchange rate fluctuations.
Roundhill Space and Technology ETF Alternatives and Related Products

The ETFs shown in the table, BAI, AIQ, and CHAT, invest broadly across artificial intelligence and technology themes. Compared with these, MARS is more narrowly focused on the space industry, with a different profile and fee structure. For more direct space-focused substitutes, consider space-specific themed products such as UFO, ARKX which invests in space and defense innovation, and ROKT, a space exploration theme. For exposure centered on large-cap aerospace and defense names, a defense ETF such as ITA is also worth reviewing alongside these.

Peer Comparison ETFs
TickerNamePriceChangeAUMTotal Expense RatioDividend Yield1Y
BAIBAIiShares A.I. Innovation and Tech Active ETF$45.33+0.2%$14.4B0.55%1.31%+37.6%
AIQAIQGlobal X Artificial Intelligence & Technology ETF$64.11-0.3%$10.2B0.68%0.07%+38.0%
ARTYARTYiShares Future AI & Tech ETF$76.32-0.5%$4.1B0.47%0.06%+75.3%
CHATCHATRoundhill Generative AI & Technology ETF$90.69-0.2%$1.9B0.75%1.85%+61.3%
LITLITGlobal X Lithium & Battery Tech ETF$73.77-0.0%$1.5B0.75%0.68%+48.5%
Top Holdings
TickerNameWeightPriceChangeMarket CapP/EDividend Yield
NVDANVIDIA Corp0.08%$223.79-0.9%$5.39T28.30.33%
AMZNAmazon.com Inc0.05%$252.47-1.8%$2.72T20.3-
NVDANVIDIA Corp0.08%$223.79-0.9%$5.39T28.30.33%
GOOGLAlphabet Inc0.07%$330.65-2.3%$4.03T16.60.24%
GOOGAlphabet Inc0.07%$328.38-2.1%$4.04T16.50.24%
AAPLApple Inc0.05%$315.41-0.3%$4.60T36.20.35%
AAPLApple Inc0.05%$315.41-0.3%$4.60T36.20.35%
MSFTMicrosoft Corp0.05%$491.80-0.4%$3.65T27.40.79%
AMZNAmazon.com Inc0.05%$252.47-1.8%$2.72T20.3-
AVGOBroadcom Inc0.04%$364.38-1.1%$1.73T46.50.72%

Roundhill Space & Technology ETF Investor Checklist

Here are the key points to review before investing in MARS. The growth potential of the space theme is significant, but volatility, costs, and the absence of income are factors that should be examined carefully in advance, so it is advisable to go through each item below.

CheckpointWhat to ConfirmCurrent Status
🚀 Thematic ConcentrationWhether you can tolerate the space industry tilt and its volatilityVolatility tends to be high
💵 Expense RatioThe long-term impact of the active management feeSomewhat elevated level
💧 LiquidityTrading volume of this new, small ETFNeeds to be checked
💱 CurrencyImpact on won-denominated returnsNo currency hedge applied

The space theme is an early-stage industry with limited visibility into individual company results, and short-term swings can be large as investor sentiment shifts. Because of its concentrated nature, drawdowns can deepen during market corrections.

It is a satellite-style holding suited to investors who want to actively bet on the long-term growth of the space economy. However, given its high volatility and expense ratio, it is preferable to approach it as a complementary allocation rather than a core holding.

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Disclaimer: This content is for informational purposes only and does not constitute investment advice. All investment responsibility lies with the investor.

This article reflects information as of July 2, 2026.

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