Do MARS and ORBX hold the same stocks?

By their latest filings, 82% of their books are the same securities at the same weight, which is close to holding one of them twice. Overlap is the sum of the smaller weight of every security they share.

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

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

Which is cheaper, MARS or ORBX?

MARS charges 0.75% a year and ORBX charges 0.50%, so ORBX is cheaper. Fees come from each fund's prospectus.

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MARS vs ORBX: which is really different?

MARS and ORBX hold 82% of their weight in the same names. Roundhill Space & Technology ETF and Global X Space Tech ETF.

0.0%

MARS in the S&P 500

0.0%

ORBX in the S&P 500

+1.4%

MARS total return, since launch

−19.6%

ORBX total return, since launch

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

ORBX · 3 months to Sep 30, 2026100% of its weight is outside the S&P 500

0% of ORBX'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?

MARS 92

ORBX 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, MARS and ORBX hold 82% 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 Sep 30, 2026.

50%

half

82% in common

Positions both hold, largest shared weight first

Holding MARS ORBX

Space Exploration Technologies Corp 24.39% 22.74%

Rocket Lab Corp 10.05% 10.37%

AST SpaceMobile Inc 7.02% 9.60%

Globalstar Inc 5.07% 4.62%

Viasat Inc 4.69% 4.45%

Planet Labs PBC 3.63% 3.48%

Iridium Communications Inc 3.45% 4.64%

MDA Space Ltd 3.27% 4.57%

Firefly Aerospace Inc 3.13% 4.35%

Intuitive Machines Inc 2.67% 3.91%

Redwire Corp 2.26% 4.20%

Avio SpA 1.93% 2.19%

Only in MARS

SKY Perfect JSAT Corp 2.91%

Eutelsat Communications SACA 2.13%

SES SA 2.04%

Voyager Technologies Inc 1.82%

Seraphim Space Investment Trust PLC 1.32%

First American Government Obligations Fund 12/01/2031 0.48%

Only in ORBX

SES 2.63%

EUTELSAT COMMUNICATIONS 1.88%

FILTRONIC PLC 1.00%

VIRGIN GALACTIC HOLDINGS INC 0.82%

CREOTECH INSTRUMENTS SA 0.71%

INTELLIAN TECHNOLOGIES INC 0.65%

OVZON AB 0.57%

ISPACE INC/JAPAN 0.54%

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

82% 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	MARS	ORBX	MARS	ORBX	MARS	ORBX
3 months	−19.7%	−21.5%	−22.2 pts	−24.0 pts	−21.8 pts	−23.6 pts
6 months	−5.6%	not published	−22.6 pts	not published	−32.5 pts	not published
Since launch MARS Mar 2026 · ORBX Apr 2026	+1.4%	−19.6%	−11.4 pts	−29.2 pts	−20.5 pts	−36.0 pts

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

On the same fields

MARS

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

ORBX

Global X Space Tech ETF · Holds 38 stocks in space, 0% of its weight in S&P 500 companies

Issuer Roundhill Global X

Theme Space Space

In the S&P 500 0.0% 0.0%

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

In the Nasdaq-100 0.0% 0.0%

Holdings 29 38

Top ten, share of the fund 67.9% 73.5%

Expense ratio 0.75% 0.50%

Fee for the differing part 0.75% 0.50%

Total return, 1 year +1.4% (since launch on Mar 5, 2026) −19.6% (since launch on Apr 15, 2026)

vs the S&P 500 −11.4 pts −29.2 pts

vs the Nasdaq-100 −20.5 pts −36.0 pts

Below its high −44.9% −46.4%

Net assets $46m $41m

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

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.

ORBX in plain words

By weight, 0% of ORBX'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 74% of the fund across 38 positions, as published by its issuer for Sep 30, 2026. Since it launched on Apr 15, 2026 the fund returned −19.6% with distributions reinvested against +9.5% for the S&P 500, so a holder was behind by 29.2 pts. It sits 46.4% below its all-time high of May 28, 2026.

Questions people ask

Do MARS and ORBX hold the same stocks?: By their latest filings, 82% of their books are the same securities at the same weight, which is close to holding one of them twice. Overlap is the sum of the smaller weight of every security they share.
Which is more different from the S&P 500, MARS or ORBX?: MARS has 0% of its weight in S&P 500 names and ORBX has 0%, so MARS differs more from the index.
Which is cheaper, MARS or ORBX?: MARS charges 0.75% a year and ORBX charges 0.50%, so ORBX is cheaper. Fees come from each fund's prospectus.

Other comparisons

MARS vs NASA MARS vs ARKX MARS vs DIPR MARS vs UFO ORBX vs UFO ORBX vs WARP ORBX vs ARKX ORBX vs DIPR

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

Where these figures came from

MARS filings on SEC EDGAR ↗MARS prospectus with the expense ratio (SEC) ↗Roundhill page for MARS ↗ORBX filings on SEC EDGAR ↗ORBX prospectus with the expense ratio (SEC) ↗Global X page for ORBX ↗

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

Open data

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