Do ARKX and MARS hold the same stocks?

By their latest filings, 19% of their books are the same securities at the same weight, which is mostly different names. Overlap is the sum of the smaller weight of every security they share.

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

ARKX has 51% of its weight in S&P 500 names and MARS has 0%, so MARS differs more from the index.

Which is cheaper, ARKX or MARS?

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

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ARKX vs MARS: which is really different?

ARKX and MARS hold 19% of their weight in the same names. ARK Space & Defense Innovation ETF and Roundhill Space & Technology ETF.

51.4%

ARKX in the S&P 500

0.0%

MARS in the S&P 500

+11.7%

ARKX total return, 1 year

+1.4%

MARS total return, since launch

ARKX · 1 year to Sep 30, 202649% of its weight is outside the S&P 500

51% of ARKX's weight is in S&P 500 companies and 49% 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?

ARKX 15.9

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, ARKX and MARS hold 19% 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

19% in common

Positions both hold, largest shared weight first

Holding ARKX MARS

SPACE EXPLORATION TECHN-CL A 10.84% 24.39%

ROCKET LAB 5.86% 10.05%

INTUITIVE MACHINES INC 1.91% 2.67%

IRIDIUM COMMUNICATIONS INC 0.47% 3.45%

Only in ARKX

L3HARRIS TECHNOLOGIES INC 6.17%

DEERE & CO 5.60%

KRATOS DEFENSE & SECURITY 5.49%

NVIDIA CORP 5.37%

AEROVIRONMENT INC 4.61%

ADVANCED MICRO DEVICES 4.52%

AMAZON.COM INC 4.48%

TERADYNE INC 4.14%

Only in MARS

AST SpaceMobile Inc 7.02%

Globalstar Inc 5.07%

Viasat Inc 4.69%

Planet Labs PBC 3.63%

MDA Space Ltd 3.27%

OHB SE 3.21%

Firefly Aerospace Inc 3.13%

SKY Perfect JSAT Corp 2.91%

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

19% 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	ARKX	MARS	ARKX	MARS	ARKX	MARS
3 months	−5.7%	−19.7%	−8.2 pts	−22.2 pts	−7.8 pts	−21.8 pts
6 months	+6.7%	−5.6%	−10.3 pts	−22.6 pts	−20.2 pts	−32.5 pts
1 year	+11.7%	not published	−4.0 pts	not published	−12.1 pts	not published
3 years	+131.5%	not published	+46.5 pts	not published	+21.5 pts	not published
Since launch ARKX Mar 2021 · MARS Mar 2026	+57.1%	+1.4%	−50.8 pts	−11.4 pts	−85.9 pts	−20.5 pts

ARKX 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

ARKX

ARK Space & Defense Innovation ETF · Holds 34 stocks in space, 51% 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 ARK Roundhill

Theme Space Space

In the S&P 500 51.4% 0.0%

Active share vs the S&P 500 83.6% 100.0%

In the Nasdaq-100 28.4% 0.0%

Holdings 34 29

Top ten, share of the fund 57.1% 67.9%

Expense ratio 0.75% 0.75%

Fee for the differing part 0.90% 0.75%

Total return, 1 year +11.7% +1.4% (since launch on Mar 5, 2026)

vs the S&P 500 −4.0 pts −11.4 pts

vs the Nasdaq-100 −12.1 pts −20.5 pts

Below its high −15.5% −44.9%

Net assets $737m $46m

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

ARKX in plain words

By weight, 51% of ARKX's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 84%. The top ten holdings are 57% of the fund across 34 positions, as published by its issuer for Oct 1, 2026. Over the year to Sep 30, 2026 the fund returned +11.7% with distributions reinvested against +15.7% for the S&P 500, so a holder was behind by 4.0 pts. It sits 15.5% below its all-time high of May 28, 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 ARKX and MARS hold the same stocks?: By their latest filings, 19% of their books are the same securities at the same weight, which is mostly different names. Overlap is the sum of the smaller weight of every security they share.
Which is more different from the S&P 500, ARKX or MARS?: ARKX has 51% of its weight in S&P 500 names and MARS has 0%, so MARS differs more from the index.
Which is cheaper, ARKX or MARS?: ARKX charges 0.75% a year and MARS charges 0.75%, so ARKX is cheaper. Fees come from each fund's prospectus.

Other comparisons

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

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

Where these figures came from

ARKX filings on SEC EDGAR ↗ARKX prospectus with the expense ratio (SEC) ↗ARK page for ARKX ↗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, ARKX against MARS, data as of Sep 30, 2026. https://etfiq.com/compare/themes/arkx-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.