Data as of .
IDEF vs IGV: which is really different?
IGV holds 82.2% 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 IGV hold 8% of their money in the same securities at the same weight.
| Holding | IDEF | IGV |
|---|---|---|
| PALANTIR TECHNOLOGIES CLASS A | 4.71% | 9.96% |
| PALO ALTO NETWORKS | 1.55% | 9.36% |
| CROWDSTRIKE HOLDINGS CLASS A | 1.22% | 7.25% |
| FORTINET | 0.71% | 3.40% |
| ZSCALER | 0.27% | 0.58% |
| USD CASH | 2.72% | 0.01% |
| Only in IDEF | Only in IGV |
|---|---|
| RTX 6.72% | MICROSOFT 9.69% |
| LOCKHEED MARTIN CORP 3.62% | SALESFORCE 6.78% |
| BOEING 3.32% | ORACLE 5.94% |
| ROLLS-ROYCE HOLDINGS PLC 3.30% | SERVICENOW 4.65% |
| GENERAL DYNAMICS CORP 2.97% | ADOBE INC 3.46% |
| THALES SA 2.61% | INTUIT 2.97% |
| NORTHROP GRUMMAN CORP 2.56% | CADENCE DESIGN SYSTEMS 2.70% |
| SPACE EXPLORATION TECHNOLOGIES COR 2.38% | APPLOVIN CLASS A 2.64% |
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 | IGV | IDEF | IGV | IDEF | IGV | |
| 3 months | −1.9% | +11.9% | −5.2 pts | +8.7 pts | −1.1 pts | +12.7 pts |
| 6 months | −8.5% | +20.6% | −24.5 pts | +4.6 pts | −29.2 pts | −0.1 pts |
| 1 year | +4.9% | −9.7% | −12.6 pts | −27.2 pts | −18.1 pts | −32.6 pts |
| 3 years | not published | +42.5% | not published | −35.3 pts | not published | −52.5 pts |
| Since launch | +26.5% | +998.5% | −6.4 pts | +194.1 pts | −13.6 pts | −675.4 pts |
| IDEF iShares Defense Industrials Active ETF Holds 152 stocks in defense, 36% of its weight in S&P 500 companies | IGV iShares Expanded Tech-Software Sector ETF Holds 108 stocks in cloud and software, 82% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | iShares | iShares |
| Theme | Defense | Cloud and software |
| In the S&P 500 | 36.1% | 82.2% |
| Active share vs the S&P 500 | 95.9% | 92.4% |
| In the Nasdaq-100 | 8.5% | 64.1% |
| Holdings | 152 | 108 |
| Top ten, share of the fund | 35.2% | 63.4% |
| Expense ratio | not published | 0.38% |
| Fee for the differing part | not published | 0.41% |
| Total return, 1 year | +4.9% | −9.7% |
| vs the S&P 500 | −12.6 pts | −27.2 pts |
| vs the Nasdaq-100 | −18.1 pts | −32.6 pts |
| Below its high | −13.9% | −13.8% |
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.
IGV in plain words
By weight, 82% of IGV'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 63% of the fund across 108 positions, as published by its issuer for Sep 10, 2026. Over the year to Sep 11, 2026 the fund returned −9.7% with distributions reinvested against +17.5% for the S&P 500, so a holder was behind by 27.2 pts. It sits 13.8% below its all-time high of Sep 22, 2025.
Questions people ask
- Which is more different from the S&P 500, IDEF or IGV?
- IDEF has 36% of its weight in S&P 500 names and IGV has 82%, 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 IGV, data as of Sep 11, 2026. https://etfiq.com/compare/themes/idef-vs-igv Free to use with attribution; the underlying files are at Open data.