Do MARS and NASA hold the same stocks?

By their latest filings, 51% 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 NASA?

MARS has 0% of its weight in S&P 500 names and NASA has 3%, so MARS differs more from the index.

Which is cheaper, MARS or NASA?

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

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MARS vs NASA: which is really different?

MARS and NASA hold 51% of their weight in the same names. Roundhill Space & Technology ETF and Tema Space Innovators ETF.

0.0%

MARS in the S&P 500

2.6%

NASA in the S&P 500

+1.4%

MARS total return, since launch

−4.8%

NASA 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

NASA · 6 months to Sep 30, 202697% of its weight is outside the S&P 500

3% of NASA's weight is in S&P 500 companies and 97% 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

NASA 82.3

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 NASA hold 51% 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

51% in common

Positions both hold, largest shared weight first

Holding MARS NASA

Rocket Lab Corp 10.05% 10.35%

Space Exploration Technologies Corp 24.39% 7.46%

AST SpaceMobile Inc 7.02% 6.94%

Viasat Inc 4.69% 5.19%

Firefly Aerospace Inc 3.13% 3.81%

MDA Space Ltd 3.27% 2.99%

Intuitive Machines Inc 2.67% 3.44%

Voyager Technologies Inc 1.82% 3.11%

Astroscale Holdings Inc 1.76% 2.33%

Planet Labs PBC 3.63% 1.55%

Synspective Inc 1.68% 1.44%

BlackSky Technology Inc 1.34% 2.24%

Only in MARS

Globalstar Inc 5.07%

Iridium Communications Inc 3.45%

SKY Perfect JSAT Corp 2.91%

Telesat Corp 2.21%

Eutelsat Communications SACA 2.13%

SES SA 2.04%

Avio SpA 1.93%

Gilat Satellite Networks Ltd 1.32%

Only in NASA

SPACEX SPV EXPOSURE 16.75%

UNIVERSAL MICROWAVE TECHNOLOGY INC 4.88%

FILTRONIC PLC 3.89%

5N PLUS INC 3.38%

LUMENTUM HOLDINGS INC 2.17%

WIN SEMICONDUCTORS CORP 1.82%

AIXTRON SE 1.60%

LIGHTPATH TECHNOLOGIES INC 1.56%

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

51% 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	NASA	MARS	NASA	MARS	NASA
3 months	−19.7%	−18.6%	−22.2 pts	−21.2 pts	−21.8 pts	−20.8 pts
6 months	−5.6%	−9.3%	−22.6 pts	−26.3 pts	−32.5 pts	−36.1 pts
Since launch MARS Mar 2026 · NASA Mar 2026	+1.4%	−4.8%	−11.4 pts	−22.7 pts	−20.5 pts	−33.3 pts

MARS and NASA 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

NASA

Tema Space Innovators ETF · Holds 35 stocks in space, 3% of its weight in S&P 500 companies

Issuer Roundhill Tema

Theme Space Space

In the S&P 500 0.0% 2.6%

Active share vs the S&P 500 100.0% 99.9%

In the Nasdaq-100 0.0% 2.2%

Holdings 29 35

Top ten, share of the fund 67.9% 66.1%

Expense ratio 0.75% 0.75%

Fee for the differing part 0.75% 0.75%

Total return, 1 year +1.4% (since launch on Mar 5, 2026) −4.8% (since launch on Mar 31, 2026)

vs the S&P 500 −11.4 pts −22.7 pts

vs the Nasdaq-100 −20.5 pts −33.3 pts

Below its high −44.9% −42.8%

Net assets $46m $1.1bn

MARS and NASA 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.

NASA in plain words

By weight, 3% of NASA'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 66% of the fund across 35 positions, as published by its issuer for Sep 30, 2026. Since it launched on Mar 31, 2026 the fund returned −4.8% with distributions reinvested against +17.9% for the S&P 500, so a holder was behind by 22.7 pts. It sits 42.8% below its all-time high of May 27, 2026.

Questions people ask

Do MARS and NASA hold the same stocks?: By their latest filings, 51% 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 NASA?: MARS has 0% of its weight in S&P 500 names and NASA has 3%, so MARS differs more from the index.
Which is cheaper, MARS or NASA?: MARS charges 0.75% a year and NASA charges 0.75%, so MARS is cheaper. Fees come from each fund's prospectus.

Other comparisons

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

MARS on its own →NASA 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 ↗NASA filings on SEC EDGAR ↗NASA prospectus with the expense ratio (SEC) ↗Tema page for NASA ↗

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 NASA, data as of Sep 30, 2026. https://etfiq.com/compare/themes/mars-vs-nasa

Open data

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