Do BAI and IDEF hold the same stocks?

By their latest filings, 10% 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, BAI or IDEF?

BAI has 55% of its weight in S&P 500 names and IDEF has 42%, so IDEF differs more from the index.

Which is cheaper, BAI or IDEF?

BAI and IDEF both charge 0.55% a year, so neither is cheaper. Fees come from each fund's prospectus.

Data as of Oct 28, 2026.

Thematic ETFs

BAI vs IDEF: Holdings Overlap & Returns

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Over the year to Oct 28, 2026, BAI returned +19.6% to IDEF's −5.7%; 10% of their weight is in the same names.

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Net assets on Oct 28, 2026: $13.6bn for iShares A.I. Innovation and Tech Active ETF and $3.7bn for iShares Defense Industrials and Tech Active ETF.

BAI on its own →IDEF on its own →

At a glance

55.3%

BAI in the S&P 500

42.5%

IDEF in the S&P 500

+19.6%

BAI total return, 1 year

−5.7%

IDEF total return, 1 year

BAI · 1 year to Oct 28, 2026 45% of its weight is outside the S&P 500

55% of BAI's weight is in S&P 500 companies and 45% is outside the index. Holdings as of Oct 27, 2026.

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.

Pair scorecard

Both cost 0.55% a year; their one-year returns differ by 25.3 points; BAI is 3.7 times larger.

Points (pts) are percentage points.

BAI vs IDEF: Holdings Overlap & Returns
Measure	BAI	IDEF
Return
Measure	BAI	IDEF
Total return, 1 year	+19.6%	−5.7%
Drawdown
Measure	BAI	IDEF
Below its all-time high	19.6%, high on Jun 22, 2026	17.0%, high on Mar 2, 2026
Against its benchmark
Measure	BAI	IDEF
What it tracks	Artificial intelligence	Defense
Its benchmark, total return, 1 year	+47.8%
Against its benchmark, 1 year	behind by 28.2 pts
Cost and size
Measure	BAI	IDEF
Expense ratio	0.55%	0.55%
Net assets	$13.6bn	$3.7bn
Holdings
Measure	BAI	IDEF
Holdings in common	10%

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

Risk and return

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

BAI IDEF

Return

Total return edge BAI +59.0% +14.9%

Annualized edge BAI +39.2% +10.4%

Price return edge BAI +56.2% +14.5%

Risk

Volatility edge IDEF 33.1% 22.4%

Max drawdown edge IDEF −24.0% −17.1%

Risk-adjusted

Sharpe edge BAI 1.05 0.38

Sortino edge BAI 1.53 0.58

Calmar edge BAI 1.63 0.61

Reading

BAI returned more: +59.0% to +14.9%. IDEF swung less: 22.4% to 33.1%. IDEF fell less at its worst: −17.1% to −24.0%.

Full scorecard

9 measures, with how each is measured Open ↓

Risk and return: BAI vs IDEF: Holdings Overlap & Returns
Measure	BAI	IDEF	Edge	How it is measured
Return
Total return	+59.0%	+14.9%	BAI	Price change plus distributions, reinvested.
Annualized	+39.2%	+10.4%	BAI	Total return as a yearly rate.
Price return	+56.2%	+14.5%	BAI	Price change alone, distributions left out.
Risk
Volatility	33.1%	22.4%	IDEF	Spread of weekly returns, annualized. Lower is steadier.
Downside deviation	22.6%	14.7%	IDEF	Like volatility, counting only weeks below the Treasury bill rate.
Max drawdown	−24.0%	−17.1%	IDEF	Deepest fall from a high to the low after it.
Risk-adjusted
Sharpe	1.05	0.38	BAI	Return above Treasury bills per unit of volatility.
Sortino	1.53	0.58	BAI	Return above Treasury bills per unit of downside deviation.
Calmar	1.63	0.61	BAI	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

10%

By the books each fund has filed, BAI and IDEF hold 10% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.

50%

0 half 100%

half

10% in common

Positions both hold · largest shared weight first BAI IDEF

SPACE EXPLORATION TECHNOLOGIES COR 3.40% 2.93%

PALO ALTO NETWORKS 1.88% 1.46%

MICROSOFT 2.40% 1.34%

CROWDSTRIKE HOLDINGS CLASS A 2.49% 1.30%

AMAZON.COM INC 2.12% 0.94%

BROADCOM INC 4.50% 0.55%

MACOM TECHNOLOGY SOLUTIONS 1.36% 0.41%

ADVANCED MICRO DEVICES 5.54% 0.34%

INTEL CORPORATION 2.77% 0.19%

MARVELL TECHNOLOGY 2.79% 0.12%

Only in one fund ↓

Only in BAI

MICRON TECHNOLOGY 6.21%

NVIDIA 5.61%

TAIWAN SEMICONDUCTOR MANUFACTURING 5.00%

LAM RESEARCH 3.43%

SNOWFLAKE 3.21%

LUMENTUM HOLDINGS 2.75%

ELITE MATERIAL 2.37%

ASIA VITAL COMPONENTS 2.30%

Only in IDEF

RTX 7.05%

LOCKHEED MARTIN 5.27%

GENERAL DYNAMICS CORP 4.15%

NORTHROP GRUMMAN CORP 3.92%

BOEING 3.44%

ROLLS-ROYCE HOLDINGS PLC 3.06%

PALANTIR TECHNOLOGIES CLASS A 3.02%

AIRBUS GROUP 2.34%

Check overlap with more funds →

Window by window

Window by window: BAI vs IDEF: Holdings Overlap & Returns
	Total return		vs its benchmark
Window	BAI	IDEF	BAI	IDEF
3 months	+16.3%	−3.0%	−5.1 pts vs ARTY	not measured
6 months	+5.1%	−5.8%	−17.8 pts vs ARTY	not measured
1 year	+19.6%	−5.7%	−28.2 pts vs ARTY	not measured
Since launchNot the same days: BAI Oct 2024 · IDEF May 2025	+77.2%	+22.1%	−33.5 pts vs ARTY	not measured

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Side by side

BAI iShares A.I. Innovation and Tech Active ETF · Holds 49 stocks in artificial intelligence, 55% of its weight in S&P 500 companies IDEF iShares Defense Industrials and Tech Active ETF · Holds 155 stocks in defense, 42% of its weight in S&P 500 companies

Issuer iShares iShares

Theme Artificial intelligence Defense

In the S&P 500 55.3% 42.5%

Active share vs the S&P 500 75.9% 92.2%

In the Nasdaq-100 50.1% 10.7%

Holdings 49 155

Top ten, share of the fund 42.5% 37.3%

Expense ratio 0.55% 0.55%

Fee for the differing part 0.72% 0.60%

Total return, 1 year +19.6% −5.7%

vs its benchmark −28.2 pts vs ARTY not measured

Below its high −19.6% −17.0%

Net assets $13.6bn $3.7bn

As of Oct 28, 2026. Source: ETFIQ.

10% of the two portfolios are the same securities at the same weight.

Client brief · page 1 of 2 Report BR-931D8039BE

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

Theme. BAI covers Artificial intelligence and IDEF covers Defense.
What each follows. BAI follows Artificial intelligence and IDEF follows Defense.
Holdings in common. 10% of the weight is in the same securities (holdings dated Oct 27, 2026).

Data as of Oct 28, 2026.

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About each fund

BAI

By weight, 55% of BAI's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 76%. The top ten holdings are 42% of the fund across 49 positions, as published by its issuer for Oct 27, 2026. Over the year to Oct 28, 2026 the fund returned +19.6% with distributions reinvested against +47.8% for its benchmark, the Morningstar Global Artificial Intelligence Select Index, so a holder was behind by 28.2 pts. It sits 19.6% below its all-time high of Jun 22, 2026.

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.

Questions people ask

Do BAI and IDEF hold the same stocks?: By their latest filings, 10% 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, BAI or IDEF?: BAI has 55% of its weight in S&P 500 names and IDEF has 42%, so IDEF differs more from the index.
Which is cheaper, BAI or IDEF?: BAI and IDEF both charge 0.55% a year, so neither is cheaper. Fees come from each fund's prospectus.

Other comparisons

BAI vs ITA BAI vs SHLD BAI vs PPA BAI vs XAR IDEF vs AIQ IDEF vs ARTY IDEF vs GRID IDEF vs CIBR

Where to next

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

Sources and dates

BAI and IDEF filings on SEC EDGAR ↗

BAI prospectus with the expense ratio (SEC) ↗

iShares page for BAI ↗

IDEF prospectus with the expense ratio (SEC) ↗

iShares page for IDEF ↗

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

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Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.