Do SMRF and TNUK hold the same stocks?

By their latest filings, 32% 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, SMRF or TNUK?

SMRF has 28% of its weight in S&P 500 names and TNUK has 18%, so TNUK differs more from the index.

Which is cheaper, SMRF or TNUK?

SMRF charges 0.65% a year and TNUK charges 0.85%, so SMRF is cheaper. Fees come from each fund's prospectus.

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SMRF vs TNUK: which is really different?

SMRF and TNUK hold 32% of their weight in the same names. ALPS Nautilus SMR, Nuclear & Technology ETF and Tortoise Nuclear Renaissance ETF.

27.8%

SMRF in the S&P 500

17.5%

TNUK in the S&P 500

−11.7%

SMRF total return, since launch

−11.8%

TNUK total return, since launch

SMRF · 6 months to Sep 30, 202672% of its weight is outside the S&P 500

28% of SMRF's weight is in S&P 500 companies and 72% is outside the index

TNUK · 6 months to Sep 30, 202683% of its weight is outside the S&P 500

18% of TNUK's weight is in S&P 500 companies and 83% is outside the index

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

SMRF 27.5

TNUK 66.3

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, SMRF and TNUK hold 32% 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 May 31, 2026.

50%

half

32% in common

Positions both hold, largest shared weight first

Holding SMRF TNUK

Cameco Corp 4.30% 7.48%

Bwx Technologies Inc 4.23% 6.66%

Uranium Energy Corp 4.00% 4.97%

Centrus Energy Corp 3.17% 4.23%

Nac Kazatomprom Jsc 3.82% 2.31%

Rolls-royce Holdings Plc 2.16% 5.06%

Oklo Inc 4.22% 1.77%

Nuscale Power Corp 3.77% 1.73%

Constellation Energy Corp 1.44% 4.51%

Ge Vernova Inc 3.82% 1.44%

Nexgen Energy Ltd 4.23% 1.29%

Denison Mines Corp 2.96% 1.09%

Only in SMRF

Cgn Power Co Ltd 4.28%

Paladin Energy Ltd 3.41%

Astera Labs Inc 2.83%

Micron Technology Inc 2.43%

Sandisk Corp/de 2.04%

Nebius Group Nv 2.02%

Seagate Technology Holdings Plc 1.85%

Western Digital Corp 1.85%

Only in TNUK

Curtiss-Wright Corp 8.15%

Doosan Enerbility Co Ltd 6.94%

Amentum Holdings Inc 4.16%

Jacobs Solutions Inc 2.11%

VanEck Uranium and Nuclear ETF 2.05%

Range Nuclear Renaissance Inde 2.05%

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

32% 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	SMRF	TNUK	SMRF	TNUK	SMRF	TNUK
3 months	−11.2%	−10.1%	−13.7 pts	−12.6 pts	−13.3 pts	−12.2 pts
6 months	−2.9%	−15.3%	−19.9 pts	−32.3 pts	−29.8 pts	−42.2 pts
Since launch SMRF Feb 2026 · TNUK Dec 2025	−11.7%	−11.8%	−24.0 pts	−25.7 pts	−34.7 pts	−33.8 pts

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

On the same fields

SMRF

ALPS Nautilus SMR, Nuclear & Technology ETF · Holds 72 stocks in nuclear and uranium, 28% of its weight in S&P 500 companies

TNUK

Tortoise Nuclear Renaissance ETF · Holds 25 stocks in nuclear and uranium, 18% of its weight in S&P 500 companies

Issuer ALPS Tortoise

Theme Nuclear and uranium Nuclear and uranium

In the S&P 500 27.8% 17.5%

Active share vs the S&P 500 92.5% 99.2%

In the Nasdaq-100 14.4% 4.5%

Holdings 72 25

Top ten, share of the fund 40.2% 61.8%

Expense ratio 0.65% 0.85%

Fee for the differing part 0.70% 0.86%

Total return, 1 year −11.7% (since launch on Feb 19, 2026) −11.8% (since launch on Dec 18, 2025)

vs the S&P 500 −24.0 pts −25.7 pts

vs the Nasdaq-100 −34.7 pts −33.8 pts

Below its high −22.1% −26.4%

Net assets $11m $2m

SMRF and TNUK on the same fields, as of Sep 30, 2026. Source: ETFIQ.

SMRF in plain words

By weight, 28% of SMRF's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 92%. The top ten holdings are 40% of the fund across 72 positions, as filed for May 31, 2026. Since it launched on Feb 19, 2026 the fund returned −11.7% with distributions reinvested against +12.3% for the S&P 500, so a holder was behind by 24.0 pts. It sits 22.1% below its all-time high of Jun 2, 2026.

TNUK in plain words

By weight, 18% of TNUK'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 62% of the fund across 25 positions, as filed for May 31, 2026. Since it launched on Dec 18, 2025 the fund returned −11.8% with distributions reinvested against +13.9% for the S&P 500, so a holder was behind by 25.7 pts. It sits 26.4% below its all-time high of Jan 28, 2026.

Questions people ask

Do SMRF and TNUK hold the same stocks?: By their latest filings, 32% 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, SMRF or TNUK?: SMRF has 28% of its weight in S&P 500 names and TNUK has 18%, so TNUK differs more from the index.
Which is cheaper, SMRF or TNUK?: SMRF charges 0.65% a year and TNUK charges 0.85%, so SMRF is cheaper. Fees come from each fund's prospectus.

Other comparisons

SMRF vs URAN SMRF vs UX SMRF vs URNJ SMRF vs URNM TNUK vs URAN TNUK vs URNJ TNUK vs UX TNUK vs URNM

SMRF on its own →TNUK on its own →How every figure is computed →Standards and sources →

Where these figures came from

SMRF filings on SEC EDGAR ↗SMRF prospectus with the expense ratio (SEC) ↗ALPS website ↗TNUK filings on SEC EDGAR ↗Tortoise 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, SMRF against TNUK, data as of Sep 30, 2026. https://etfiq.com/compare/themes/smrf-vs-tnuk

Open data

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