Do MARS and UFO hold the same stocks?

By their latest filings, 46% 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, MARS or UFO?

MARS has 0% of its weight in S&P 500 names and UFO has 36%, so MARS differs more from the index.

Which is cheaper, MARS or UFO?

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

Share on X Download as PDF Open live

MARS vs UFO: which is really different?

MARS and UFO hold 46% of their weight in the same names. Roundhill Space & Technology ETF and Procure Space ETF.

0.0%

MARS in the S&P 500

35.9%

UFO in the S&P 500

+1.4%

MARS total return, since launch

+19.0%

UFO total return, 1 year

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

UFO · 1 year to Sep 30, 202664% of its weight is outside the S&P 500

36% of UFO's weight is in S&P 500 companies and 64% 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

UFO 56.7

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 UFO hold 46% 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 Apr 30, 2026 and Sep 30, 2026.

50%

half

46% in common

Positions both hold, largest shared weight first

Holding MARS UFO

Globalstar Inc 5.07% 5.32%

Rocket Lab Corp 10.05% 5.06%

Viasat Inc 4.69% 5.94%

Planet Labs PBC 3.63% 6.21%

AST SpaceMobile Inc 7.02% 3.56%

Iridium Communications Inc 3.45% 4.53%

MDA Space Ltd 3.27% 4.13%

Firefly Aerospace Inc 3.13% 3.90%

SKY Perfect JSAT Corp 2.91% 3.52%

Intuitive Machines Inc 2.67% 3.48%

SES SA 2.04% 4.03%

Voyager Technologies Inc 1.82% 1.72%

Only in MARS

Space Exploration Technologies Corp 24.39%

OHB SE 3.21%

York Space Systems Inc 1.57%

Seraphim Space Investment Trust PLC 1.32%

Satrec Initiative Co Ltd 1.19%

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

Only in UFO

Sirius XM Holdings Inc 5.08%

EchoStar Corp 4.79%

Garmin Ltd 4.46%

Trimble Inc 4.27%

Boeing Co/The 2.35%

Airbus SE 2.17%

Honeywell International Inc 1.93%

L3Harris Technologies Inc 1.88%

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

46% 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	UFO	MARS	UFO	MARS	UFO
3 months	−19.7%	−15.7%	−22.2 pts	−18.2 pts	−21.8 pts	−17.8 pts
6 months	−5.6%	−8.4%	−22.6 pts	−25.4 pts	−32.5 pts	−35.3 pts
1 year	not published	+19.0%	not published	+3.3 pts	not published	−4.8 pts
3 years	not published	+160.4%	not published	+75.5 pts	not published	+50.5 pts
Since launch MARS Mar 2026 · UFO Apr 2019	+1.4%	+86.5%	−11.4 pts	−108.9 pts	−20.5 pts	−232.4 pts

MARS and UFO 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

UFO

Procure Space ETF · Holds 64 stocks in space, 36% of its weight in S&P 500 companies

Issuer Roundhill Procure

Theme Space Space

In the S&P 500 0.0% 35.9%

Active share vs the S&P 500 100.0% 98.6%

In the Nasdaq-100 0.0% 1.1%

Holdings 29 64

Top ten, share of the fund 67.9% 48.5%

Expense ratio 0.75% 0.75%

Fee for the differing part 0.75% 0.76%

Total return, 1 year +1.4% (since launch on Mar 5, 2026) +19.0%

vs the S&P 500 −11.4 pts +3.3 pts

vs the Nasdaq-100 −20.5 pts −4.8 pts

Below its high −44.9% −37.5%

Net assets $46m $587m

MARS and UFO 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.

UFO in plain words

By weight, 36% of UFO'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 48% of the fund across 64 positions, as filed for Apr 30, 2026. Over the year to Sep 30, 2026 the fund returned +19.0% with distributions reinvested against +15.7% for the S&P 500, so a holder was ahead by 3.3 pts. It sits 37.5% below its all-time high of May 28, 2026.

Questions people ask

Do MARS and UFO hold the same stocks?: By their latest filings, 46% 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, MARS or UFO?: MARS has 0% of its weight in S&P 500 names and UFO has 36%, so MARS differs more from the index.
Which is cheaper, MARS or UFO?: MARS charges 0.75% a year and UFO charges 0.75%, so MARS is cheaper. Fees come from each fund's prospectus.

Other comparisons

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

MARS on its own →UFO 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 ↗UFO filings on SEC EDGAR ↗UFO prospectus with the expense ratio (SEC) ↗Procure website ↗

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

Open data

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