Do IDEF and QTUM hold the same stocks?

By their latest filings, 12% of their books are the same securities at the same weight. Overlap is the sum of the smaller weight of every security they share.

Which is more different from the S&P 500, IDEF or QTUM?

IDEF has 42% of its weight in S&P 500 names and QTUM has 38%, so IDEF differs more from the index.

Which is cheaper, IDEF or QTUM?

IDEF charges 0.55% a year and QTUM charges 0.40%, so QTUM is cheaper. Fees come from each fund's prospectus.

Data as of Oct 28, 2026.

Thematic ETFs

IDEF vs QTUM: Holdings Overlap & Returns

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Over the year to Oct 28, 2026, IDEF returned −5.7% to QTUM's +28.9%; 12% of their weight is in the same names.

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Net assets: $3.7bn on Oct 28, 2026 for iShares Defense Industrials and Tech Active ETF, and $5.4bn on Oct 27, 2026 for Defiance Quantum ETF.

IDEF on its own →QTUM on its own →

At a glance

42.5%

IDEF in the S&P 500

37.5%

QTUM in the S&P 500

−5.7%

IDEF total return, 1 year

+28.9%

QTUM total return, 1 year

IDEF · 1 year to Oct 28, 2026 58% of its weight is outside the S&P 500

43% of IDEF's weight is in S&P 500 companies and 58% is outside the index. Holdings as of Oct 27, 2026.

QTUM · 1 year to Oct 28, 2026 63% of its weight is outside the S&P 500

38% of QTUM's weight is in S&P 500 companies and 63% is outside the index. Holdings as of Oct 28, 2026.

Pair scorecard

QTUM costs 0.15 points a year less; their one-year returns differ by 34.6 points; QTUM is 1.5 times larger.

IDEF vs QTUM: Holdings Overlap & Returns
Measure	IDEF	QTUM
Return
Measure	IDEF	QTUM
Total return, 1 year	−5.7%	+28.9%
Drawdown
Measure	IDEF	QTUM
Below its all-time high	17.0%, high on Mar 2, 2026	14.3%, high on Jun 2, 2026
Benchmark
Measure	IDEF	QTUM
What it tracks	Defense	Quantum computing
Cost and size
Measure	IDEF	QTUM
Expense ratio	0.55%	0.40%
Net assets, as of Oct 27, 2026	$3.7bn	$5.4bn
Holdings
Measure	IDEF	QTUM
Holdings in common	12%
Top ten holdings, share of the fund	37%	18%

Holdings in common uses holdings dated Oct 27, 2026 and Oct 28, 2026. Method

Risk and return

May 30, 2025 to Oct 23, 2026 · 73 weekly returns

IDEF QTUM

Return

Total return edge QTUM +14.9% +63.4%

Annualized edge QTUM +10.4% +41.9%

Price return edge QTUM +14.5% +60.8%

Risk

Volatility edge IDEF 22.4% 27.8%

Max drawdown edge IDEF (slight) −17.1% −18.5%

Risk-adjusted

Sharpe edge QTUM 0.38 1.26

Sortino edge QTUM 0.58 2.02

Calmar edge QTUM 0.61 2.26

Reading

QTUM returned more: +63.4% to +14.9%. IDEF swung less: 22.4% to 27.8%. IDEF fell slightly less at its worst: −17.1% to −18.5%.

Full scorecard

9 measures, with how each is measured Open ↓

Risk and return: IDEF vs QTUM: Holdings Overlap & Returns
Measure	IDEF	QTUM	Edge	How it is measured
Return
Total return	+14.9%	+63.4%	QTUM	Price change plus distributions, reinvested.
Annualized	+10.4%	+41.9%	QTUM	Total return as a yearly rate.
Price return	+14.5%	+60.8%	QTUM	Price change alone, distributions left out.
Risk
Volatility	22.4%	27.8%	IDEF	Spread of weekly returns, annualized. Lower is steadier.
Downside deviation	14.7%	17.3%	IDEF	Like volatility, counting only weeks below the Treasury bill rate.
Max drawdown	−17.1%	−18.5%	IDEF (slight)	Deepest fall from a high to the low after it.
Risk-adjusted
Sharpe	0.38	1.26	QTUM	Return above Treasury bills per unit of volatility.
Sortino	0.58	2.02	QTUM	Return above Treasury bills per unit of downside deviation.
Calmar	0.61	2.26	QTUM	Annualized return divided by the max drawdown.

Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 73 weekly returns. Cash rate: the 13-week Treasury bill.

What they share

12%

By the books each fund has filed, IDEF and QTUM hold 12% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026 and Oct 28, 2026.

50%

0 half 100%

half

12% in common

Positions both hold · largest shared weight first IDEF QTUM

PALANTIR TECHNOLOGIES CLASS A 3.02% 1.84%

LOCKHEED MARTIN 5.27% 1.46%

MICROSOFT 1.34% 1.63%

RTX 7.05% 1.34%

AIRBUS GROUP 2.34% 1.29%

NORTHROP GRUMMAN CORP 3.92% 1.24%

MITSUBISHI ELECTRIC 1.44% 1.07%

AMAZON.COM INC 0.94% 1.30%

BROADCOM INC 0.55% 1.15%

HONEYWELL AEROSPACE INC 0.63% 0.52%

ADVANCED MICRO DEVICES 0.34% 1.56%

INTEL CORPORATION 0.19% 1.09%

Only in one fund ↓

Only in IDEF

GENERAL DYNAMICS CORP 4.15%

BOEING 3.44%

ROLLS-ROYCE HOLDINGS PLC 3.06%

SPACE EXPLORATION TECHNOLOGIES COR 2.93%

THALES SA 2.15%

SAAB CLASS B 1.85%

GE AEROSPACE 1.72%

MITSUBISHI HEAVY INDUSTRIES 1.59%

Only in QTUM

Global Unichip Corp 2.43%

Elastic Nv 2.14%

Horizon Quantum Holdings Ltd 1.86%

Nutanix Inc 1.78%

Cloudflare Inc 1.77%

Snowflake Inc 1.73%

Arqit Quantum Inc 1.72%

Fujitsu Ltd 1.64%

Check overlap with more funds →

Window by window

Window by window: IDEF vs QTUM: Holdings Overlap & Returns
	Total return
Window	IDEF	QTUM
3 months	−3.0%	+9.1%
6 months	−5.8%	+11.2%
1 year	−5.7%	+28.9%
3 years	–	+229.7%
Since launchNot the same days: IDEF May 2025 · QTUM Sep 2018	+22.1%	+522.8%

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Side by side

IDEF iShares Defense Industrials and Tech Active ETF · Holds 155 stocks in defense, 42% of its weight in S&P 500 companies QTUM Defiance Quantum ETF · Holds 85 stocks in quantum computing, 38% of its weight in S&P 500 companies

Issuer iShares Defiance

Theme Defense Quantum computing

In the S&P 500 42.5% 37.5%

Active share vs the S&P 500 92.2% 82.2%

In the Nasdaq-100 10.7% 28.0%

Holdings 155 85

Top ten, share of the fund 37.3% 18.5%

Expense ratio 0.55% 0.40%

Fee for the differing part 0.60% 0.49%

Total return, 1 year −5.7% +28.9%

vs its benchmark not measured not measured

Below its high −17.0% −14.3%

Net assets, IDEF as of Oct 28, 2026 and QTUM as of Oct 27, 2026 $3.7bn $5.4bn

As of Oct 28, 2026. Source: ETFIQ.

12% of the two portfolios are the same securities at the same weight.

Client brief · page 1 of 2 Report BR-6A8C926627

IDEF and QTUM are built for the same job. How do they differ in cost, holdings and results?

Theme. IDEF covers Defense and QTUM covers Quantum computing.
Concentration. The top ten holdings are 37.3% of IDEF and 18.5% of QTUM, a gap of 18.8 points.
What each follows. IDEF follows Defense and QTUM follows Quantum computing.

Data as of Oct 28, 2026.

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About each fund

IDEF

By weight, 42% of IDEF'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 37% of the fund across 155 positions, as published by its issuer for Oct 27, 2026. Over the year to Oct 28, 2026 the fund returned −5.7% with distributions reinvested. It sits 17.0% below its all-time high of Mar 2, 2026.

QTUM

By weight, 38% of QTUM's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 82%. The top ten holdings are 18% of the fund across 85 positions, as published by its issuer for Oct 28, 2026. Over the year to Oct 28, 2026 the fund returned +28.9% with distributions reinvested. It sits 14.3% below its all-time high of Jun 2, 2026.

Questions people ask

Do IDEF and QTUM hold the same stocks?: By their latest filings, 12% of their books are the same securities at the same weight. Overlap is the sum of the smaller weight of every security they share.
Which is more different from the S&P 500, IDEF or QTUM?: IDEF has 42% of its weight in S&P 500 names and QTUM has 38%, so IDEF differs more from the index.
Which is cheaper, IDEF or QTUM?: IDEF charges 0.55% a year and QTUM charges 0.40%, so QTUM is cheaper. Fees come from each fund's prospectus.

Other comparisons

IDEF vs XAR IDEF vs SHLD IDEF vs ARKK IDEF vs SIL QTUM vs XAR QTUM vs SHLD QTUM vs PPA QTUM vs ITA

Where to next

All thematic ETFs ranked by the S&P 500 Difference Score →How the scores are computed →IDEF on its own →QTUM on its own →IDEF dividend history →IDEF holdings →QTUM dividend history →QTUM holdings →Method →Standards and sources →

Sources and dates

IDEF filings on SEC EDGAR ↗

IDEF prospectus with the expense ratio (SEC) ↗

iShares page for IDEF ↗

QTUM filings on SEC EDGAR ↗

QTUM prospectus with the expense ratio (SEC) ↗

Defiance page for QTUM ↗

Links are sources, not endorsements. A comparison is not a recommendation.

How this is computed

Overlap adds up the smaller of the two weights for each security both funds hold.

Every number is an ETFIQ calculation with distributions reinvested.

Cite this pageCitation, APA and Markdown

ETFIQ, IDEF against QTUM, data as of Oct 28, 2026. https://etfiq.com/compare/themes/idef-vs-qtum

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