Do GALX and MARS hold the same stocks?

By their latest filings, 28% of their books are the same securities at the same weight, which is a meaningful overlap. Overlap is the sum of the smaller weight of every security they share.

Which is more different from the S&P 500, GALX or MARS?

GALX has 14% of its weight in S&P 500 names and MARS has 0%, so MARS differs more from the index.

Which is cheaper, GALX or MARS?

GALX charges 0.75% a year and MARS charges 0.75%, so GALX is cheaper. Fees come from each fund's prospectus.

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GALX vs MARS: which is really different?

GALX and MARS hold 28% of their weight in the same names. VistaShares Space Supercycle ETF and Roundhill Space & Technology ETF.

13.5%

GALX in the S&P 500

0.0%

MARS in the S&P 500

−1.9%

GALX total return, since launch

+1.4%

MARS total return, since launch

GALX · since launch to Sep 30, 202687% of its weight is outside the S&P 500

14% of GALX's weight is in S&P 500 companies and 87% is outside the index

MARS · 6 months to Sep 30, 2026100% of its weight is outside the S&P 500

0% of MARS's weight is in S&P 500 companies and 100% is outside the index

ETFIQ Off-Index Score · MARS scores higherHow much of it is not the index it is sold as an alternative to?

GALX 62.3

MARS 92

0.1, the lowest in this set92.0, the highest

A percentile among the 375 thematic ETFs with a holdings filing. It is a position in a set, not a rating, and neither end of it is a recommendation. All thematic ETFs ranked by it → How it is computed →

What they hold in common

By the books each fund has filed, GALX and MARS hold 28% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated Oct 1, 2026 and Sep 30, 2026.

50%

half

28% in common

Positions both hold, largest shared weight first

Holding GALX MARS

Rocket Lab Corp 4.25% 10.05%

MDA Space Ltd 3.87% 3.27%

AST SpaceMobile Inc 2.98% 7.02%

Space Exploration Technologies Corp 2.83% 24.39%

Firefly Aerospace Inc 2.24% 3.13%

Avio SpA 3.33% 1.93%

Gilat Satellite Networks Ltd 2.93% 1.32%

Redwire Corp 1.15% 2.26%

Viasat Inc 1.07% 4.69%

York Space Systems Inc 1.07% 1.57%

Intuitive Machines Inc 1.02% 2.67%

Astroscale Holdings Inc 1.00% 1.76%

Only in GALX

MACOM Technology Solutions Holdings Inc 4.35%

AMETEK Inc 4.00%

Moog Inc 3.66%

Frequency Electronics Inc 3.50%

Teledyne Technologies Inc 3.18%

Kongsberg Gruppen ASA 3.03%

5N Plus Inc 3.01%

Filtronic PLC 2.99%

Only in MARS

Globalstar Inc 5.07%

Planet Labs PBC 3.63%

Iridium Communications Inc 3.45%

OHB SE 3.21%

SKY Perfect JSAT Corp 2.91%

Eutelsat Communications SACA 2.13%

SES SA 2.04%

Synspective Inc 1.68%

Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed.

28% of the two portfolios are the same securities at the same weight.

Performance, window by window

	Total return		vs the S&P 500		vs the Nasdaq-100
Window	GALX	MARS	GALX	MARS	GALX	MARS
3 months	not published	−19.7%	not published	−22.2 pts	not published	−21.8 pts
6 months	not published	−5.6%	not published	−22.6 pts	not published	−32.5 pts
Since launch GALX Jul 2026 · MARS Mar 2026	−1.9%	+1.4%	−3.7 pts	−11.4 pts	−6.8 pts	−20.5 pts

GALX and MARS over each window. Every figure is an ETFIQ calculation with distributions reinvested. Source: ETFIQ. Open the live comparison on ETFIQ →

On the same fields

GALX

VistaShares Space Supercycle ETF · Holds 59 stocks in space, 14% of its weight in S&P 500 companies

MARS

Roundhill Space & Technology ETF · Holds 29 stocks in space, 0% of its weight in S&P 500 companies

Issuer VistaShares Roundhill

Theme Space Space

In the S&P 500 13.5% 0.0%

Active share vs the S&P 500 99.0% 100.0%

In the Nasdaq-100 0.0% 0.0%

Holdings 59 29

Top ten, share of the fund 36.2% 67.9%

Expense ratio 0.75% 0.75%

Fee for the differing part 0.76% 0.75%

Total return, 1 year −1.9% (since launch on Jul 16, 2026) +1.4% (since launch on Mar 5, 2026)

vs the S&P 500 −3.7 pts −11.4 pts

vs the Nasdaq-100 −6.8 pts −20.5 pts

Below its high −13.0% −44.9%

Net assets $3m $46m

GALX and MARS on the same fields, as of Sep 30, 2026. Source: ETFIQ.

GALX in plain words

By weight, 14% of GALX's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 99%. The top ten holdings are 36% of the fund across 59 positions, as published by its issuer for Oct 1, 2026. Since it launched on Jul 16, 2026 the fund returned −1.9% with distributions reinvested against +1.8% for the S&P 500, so a holder was behind by 3.7 pts. It sits 13.0% below its all-time high of Aug 12, 2026.

MARS in plain words

By weight, 0% of MARS's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 100%. The top ten holdings are 68% of the fund across 29 positions, as published by its issuer for Sep 30, 2026. Since it launched on Mar 5, 2026 the fund returned +1.4% with distributions reinvested against +12.8% for the S&P 500, so a holder was behind by 11.4 pts. It sits 44.9% below its all-time high of May 28, 2026.

Questions people ask

Do GALX and MARS hold the same stocks?: By their latest filings, 28% of their books are the same securities at the same weight, which is a meaningful overlap. Overlap is the sum of the smaller weight of every security they share.
Which is more different from the S&P 500, GALX or MARS?: GALX has 14% of its weight in S&P 500 names and MARS has 0%, so MARS differs more from the index.
Which is cheaper, GALX or MARS?: GALX charges 0.75% a year and MARS charges 0.75%, so GALX is cheaper. Fees come from each fund's prospectus.

Other comparisons

GALX vs ARKX GALX vs NASA GALX vs ORBX GALX vs WARP MARS vs NASA MARS vs ARKX MARS vs ORBX MARS vs UFO

GALX on its own →MARS on its own →How every figure is computed →Standards and sources →

Where these figures came from

GALX filings on SEC EDGAR ↗GALX prospectus with the expense ratio (SEC) ↗VistaShares page for GALX ↗MARS filings on SEC EDGAR ↗MARS prospectus with the expense ratio (SEC) ↗Roundhill page for MARS ↗

ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement. A comparison is not a recommendation.

Cite this page

ETFIQ, GALX against MARS, data as of Sep 30, 2026. https://etfiq.com/compare/themes/galx-vs-mars

Open data

Free to use with attribution. Every figure is calculated from a named public source; the method is at etfiq.com/methodology.