MARS ETF Explained: Returns, Expense Ratio, Holdings, and Alternative ETFs
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.
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.
How Does the Roundhill Space & Technology ETF Invest?
| Item | Details |
|---|---|
| Tracking Index | Actively managed (does not track a specific index) |
| Management Style | Active (stock selection) |
| Rebalancing Cycle | At the portfolio managers' discretion |
| Dividend Schedule | No distributions paid |
| Total Expense Ratio | 0.75% |
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
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 FlowsThe 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.
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
⚠️ Points to Watch
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.
| Checkpoint | What to Confirm | Current Status |
|---|---|---|
| 🚀 Thematic Concentration | Whether you can tolerate the space industry tilt and its volatility | Volatility tends to be high |
| 💵 Expense Ratio | The long-term impact of the active management fee | Somewhat elevated level |
| 💧 Liquidity | Trading volume of this new, small ETF | Needs to be checked |
| 💱 Currency | Impact on won-denominated returns | No 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.
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
⚠️ Points to Watch
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.
| Ticker | Name | Price | Change | AUM | Total Expense Ratio | Dividend Yield | 1Y |
|---|---|---|---|---|---|---|---|
| iShares A.I. Innovation and Tech Active ETF | $45.33 | +0.2% | $14.4B | 0.55% | 1.31% | +37.6% | |
| Global X Artificial Intelligence & Technology ETF | $64.11 | -0.3% | $10.2B | 0.68% | 0.07% | +38.0% | |
| iShares Future AI & Tech ETF | $76.32 | -0.5% | $4.1B | 0.47% | 0.06% | +75.3% | |
| Roundhill Generative AI & Technology ETF | $90.69 | -0.2% | $1.9B | 0.75% | 1.85% | +61.3% | |
| Global X Lithium & Battery Tech ETF | $73.77 | -0.0% | $1.5B | 0.75% | 0.68% | +48.5% |
| Ticker | Name | Weight | Price | Change | Market Cap | P/E | Dividend Yield |
|---|---|---|---|---|---|---|---|
| NVDA | NVIDIA Corp | 0.08% | $223.79 | -0.9% | $5.39T | 28.3 | 0.33% |
| AMZN | Amazon.com Inc | 0.05% | $252.47 | -1.8% | $2.72T | 20.3 | - |
| NVDA | NVIDIA Corp | 0.08% | $223.79 | -0.9% | $5.39T | 28.3 | 0.33% |
| GOOGL | Alphabet Inc | 0.07% | $330.65 | -2.3% | $4.03T | 16.6 | 0.24% |
| GOOG | Alphabet Inc | 0.07% | $328.38 | -2.1% | $4.04T | 16.5 | 0.24% |
| AAPL | Apple Inc | 0.05% | $315.41 | -0.3% | $4.60T | 36.2 | 0.35% |
| AAPL | Apple Inc | 0.05% | $315.41 | -0.3% | $4.60T | 36.2 | 0.35% |
| MSFT | Microsoft Corp | 0.05% | $491.80 | -0.4% | $3.65T | 27.4 | 0.79% |
| AMZN | Amazon.com Inc | 0.05% | $252.47 | -1.8% | $2.72T | 20.3 | - |
| AVGO | Broadcom Inc | 0.04% | $364.38 | -1.1% | $1.73T | 46.5 | 0.72% |
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.
| Checkpoint | What to Confirm | Current Status |
|---|---|---|
| 🚀 Thematic Concentration | Whether you can tolerate the space industry tilt and its volatility | Volatility tends to be high |
| 💵 Expense Ratio | The long-term impact of the active management fee | Somewhat elevated level |
| 💧 Liquidity | Trading volume of this new, small ETF | Needs to be checked |
| 💱 Currency | Impact on won-denominated returns | No 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.
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.