Data as of .
IDEF vs XT: which is really different?
XT holds 64.0% of its weight in S&P 500 companies and IDEF 36.1%.
ETFIQ Off-Index Score: IDEF scores higher
How much of it is not the index it is sold as an alternative to?
A percentile among the 371 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, IDEF and XT hold 8% of their money in the same securities at the same weight.
| Holding | IDEF | XT |
|---|---|---|
| PALO ALTO NETWORKS | 1.55% | 2.74% |
| CROWDSTRIKE HOLDINGS CLASS A | 1.22% | 2.14% |
| BAE SYSTEMS PLC | 2.11% | 0.75% |
| NORTHROP GRUMMAN CORP | 2.56% | 0.73% |
| FORTINET | 0.71% | 0.90% |
| RHEINMETALL AG | 1.18% | 0.57% |
| PALANTIR TECHNOLOGIES CLASS A | 4.71% | 0.44% |
| THALES SA | 2.61% | 0.25% |
| LEONARDO FINMECCANICA SPA | 1.63% | 0.24% |
| SAAB CLASS B | 1.59% | 0.23% |
| SINGAPORE TECHNOLOGIES ENGINEERING | 0.85% | 0.22% |
| AMPHENOL CORP CLASS A | 1.32% | 0.21% |
| Only in IDEF | Only in XT |
|---|---|
| RTX 6.72% | MICROSOFT 4.21% |
| LOCKHEED MARTIN CORP 3.62% | NVIDIA 4.18% |
| BOEING 3.32% | ELI LILLY 3.90% |
| ROLLS-ROYCE HOLDINGS PLC 3.30% | TESLA INC 3.55% |
| GENERAL DYNAMICS CORP 2.97% | TEXAS INSTRUMENT INC 3.55% |
| SPACE EXPLORATION TECHNOLOGIES COR 2.38% | JOHNSON & JOHNSON 3.48% |
| HANWHA AEROSPACE LTD 2.28% | ANALOG DEVICES 2.88% |
| GE AEROSPACE 1.90% | AMAZON.COM INC 2.87% |
Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Sep 10, 2026.
Performance, window by window
| Window | Total return | vs the S&P 500 | vs the Nasdaq-100 | |||
|---|---|---|---|---|---|---|
| IDEF | XT | IDEF | XT | IDEF | XT | |
| 3 months | −1.9% | +0.7% | −5.2 pts | −2.6 pts | −1.1 pts | +1.5 pts |
| 6 months | −8.5% | +18.0% | −24.5 pts | +2.0 pts | −29.2 pts | −2.7 pts |
| 1 year | +4.9% | +25.7% | −12.6 pts | +8.2 pts | −18.1 pts | +2.8 pts |
| 3 years | not published | +63.3% | not published | −14.6 pts | not published | −31.8 pts |
| Since launch | +26.5% | +279.7% | −6.4 pts | −61.9 pts | −13.6 pts | −340.9 pts |
| IDEF iShares Defense Industrials Active ETF Holds 152 stocks in defense, 36% of its weight in S&P 500 companies | XT iShares Future Exponential Technologies ETF Holds 192 stocks in broad innovation and megatrends, 64% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | iShares | iShares |
| Theme | Defense | Broad innovation and megatrends |
| In the S&P 500 | 36.1% | 64.0% |
| Active share vs the S&P 500 | 95.9% | 67.4% |
| In the Nasdaq-100 | 8.5% | 38.8% |
| Holdings | 152 | 192 |
| Top ten, share of the fund | 35.2% | 33.8% |
| Expense ratio | not published | 0.46% |
| Fee for the differing part | not published | 0.68% |
| Total return, 1 year | +4.9% | +25.7% |
| vs the S&P 500 | −12.6 pts | +8.2 pts |
| vs the Nasdaq-100 | −18.1 pts | +2.8 pts |
| Below its high | −13.9% | −3.2% |
IDEF in plain words
By weight, 36% of IDEF's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 96%. The top ten holdings are 35% of the fund across 152 positions, as published by its issuer for Sep 10, 2026. Over the year to Sep 11, 2026 the fund returned +4.9% with distributions reinvested against +17.5% for the S&P 500, so a holder was behind by 12.6 pts. It sits 13.9% below its all-time high of Mar 2, 2026.
XT in plain words
By weight, 64% of XT's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 67%. The top ten holdings are 34% of the fund across 192 positions, as published by its issuer for Sep 10, 2026. Over the year to Sep 11, 2026 the fund returned +25.7% with distributions reinvested against +17.5% for the S&P 500, so a holder was ahead by 8.2 pts.
Questions people ask
- Which is more different from the S&P 500, IDEF or XT?
- IDEF has 36% of its weight in S&P 500 names and XT has 64%, so IDEF differs more from the index.
Other comparisons
Where these figures came from
ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.
Cite this page. ETFIQ, IDEF against XT, data as of Sep 11, 2026. https://etfiq.com/compare/themes/idef-vs-xt Free to use with attribution; the underlying files are at Open data.