Do RCTR and TNUK hold the same stocks?

By their latest filings, 44% 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, RCTR or TNUK?

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

Which is cheaper, RCTR or TNUK?

RCTR charges 0.70% a year and TNUK charges 0.85%, so RCTR is cheaper. Fees come from each fund's prospectus.

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RCTR vs TNUK: which is really different?

RCTR and TNUK hold 44% of their weight in the same names. First Trust Bloomberg Nuclear Power ETF and Tortoise Nuclear Renaissance ETF.

27.5%

RCTR in the S&P 500

17.5%

TNUK in the S&P 500

−2.0%

RCTR total return, 1 year

−11.8%

TNUK total return, since launch

RCTR · 1 year to Sep 30, 202673% of its weight is outside the S&P 500

28% of RCTR's weight is in S&P 500 companies and 73% 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?

RCTR 60.1

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, RCTR and TNUK hold 44% 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 and Sep 30, 2026.

50%

half

44% in common

Positions both hold, largest shared weight first

Holding RCTR TNUK

Doosan Enerbility Co., Ltd. 5.08% 6.94%

Rolls-Royce Holdings Plc 4.57% 5.06%

Constellation Energy Corporation 5.03% 4.51%

Vistra Corp. 4.34% 4.70%

Cameco Corp. 4.18% 7.48%

Talen Energy Corporation 4.06% 6.90%

BWX Technologies, Inc. 3.39% 6.66%

Fortum Oyj 1.98% 4.50%

Oklo Inc. (Class A) 1.92% 1.77%

Uranium Energy Corp. 1.61% 4.97%

GE Vernova Inc. 4.04% 1.44%

NexGen Energy Ltd. 2.03% 1.29%

Only in RCTR

Hitachi, Ltd. 5.75%

Mitsubishi Heavy Industries, Ltd. 4.91%

BHP Group Limited 4.77%

Duke Energy Corporation 4.17%

Entergy Corporation 4.08%

The Southern Company 4.01%

CEZ, a.s. 3.39%

The Kansai Electric Power Company, Incorporated 2.93%

Only in TNUK

Curtiss-Wright Corp 8.15%

Public Service Enterprise Grou 4.75%

Amentum Holdings Inc 4.16%

NAC Kazatomprom JSC 2.31%

Jacobs Solutions Inc 2.11%

VanEck Uranium and Nuclear ETF 2.05%

Range Nuclear Renaissance Inde 2.05%

Energy Fuels Inc/Canada 0.83%

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

44% 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	RCTR	TNUK	RCTR	TNUK	RCTR	TNUK
3 months	−3.6%	−10.1%	−6.1 pts	−12.6 pts	−5.7 pts	−12.2 pts
6 months	−10.6%	−15.3%	−27.6 pts	−32.3 pts	−37.5 pts	−42.2 pts
1 year	−2.0%	not published	−17.7 pts	not published	−25.8 pts	not published
Since launch RCTR Jul 2025 · TNUK Dec 2025	+6.0%	−11.8%	−16.3 pts	−25.7 pts	−25.7 pts	−33.8 pts

RCTR 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

RCTR

First Trust Bloomberg Nuclear Power ETF · Holds 50 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 First Trust Tortoise

Theme Nuclear and uranium Nuclear and uranium

In the S&P 500 27.5% 17.5%

Active share vs the S&P 500 98.9% 99.2%

In the Nasdaq-100 5.0% 4.5%

Holdings 50 25

Top ten, share of the fund 46.9% 61.8%

Expense ratio 0.70% 0.85%

Fee for the differing part 0.71% 0.86%

Total return, 1 year −2.0% −11.8% (since launch on Dec 18, 2025)

vs the S&P 500 −17.7 pts −25.7 pts

vs the Nasdaq-100 −25.8 pts −33.8 pts

Below its high −17.8% −26.4%

Net assets $29m $2m

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

RCTR in plain words

By weight, 28% of RCTR'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 47% of the fund across 50 positions, as published by its issuer for Sep 30, 2026. Over the year to Sep 30, 2026 the fund returned −2.0% with distributions reinvested against +15.7% for the S&P 500, so a holder was behind by 17.7 pts. It sits 17.8% below its all-time high of May 6, 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 RCTR and TNUK hold the same stocks?: By their latest filings, 44% 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, RCTR or TNUK?: RCTR has 28% of its weight in S&P 500 names and TNUK has 18%, so TNUK differs more from the index.
Which is cheaper, RCTR or TNUK?: RCTR charges 0.70% a year and TNUK charges 0.85%, so RCTR is cheaper. Fees come from each fund's prospectus.

Other comparisons

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

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

Where these figures came from

RCTR filings on SEC EDGAR ↗RCTR prospectus with the expense ratio (SEC) ↗First Trust page for RCTR ↗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, RCTR against TNUK, data as of Sep 30, 2026. https://etfiq.com/compare/themes/rctr-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.