Data as of .
IDEF vs WDEF: which is really different?
IDEF and WDEF hold 21% of their weight in the same names, and IDEF returned more over the year.
ETFIQ Off-Index Score: WDEF scores higher
How much of it is not the index it is sold as an alternative to?
A percentile among the 379 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
21% of the two portfolios are the same securities at the same weight.
What they hold in common
By the books each fund has filed, IDEF and WDEF hold 21% of their money in the same securities at the same weight.
| Holding | IDEF | WDEF |
|---|---|---|
| ROLLS-ROYCE HOLDINGS PLC | 3.29% | 5.57% |
| AIRBUS GROUP | 2.55% | 5.34% |
| BAE SYSTEMS PLC | 2.18% | 10.21% |
| THALES SA | 2.18% | 10.14% |
| LEONARDO FINMECCANICA SPA | 1.60% | 4.79% |
| SAFRAN SA | 1.30% | 5.62% |
| RHEINMETALL AG | 1.15% | 8.70% |
| KONGSBERG GRUPPEN | 0.87% | 4.61% |
| BABCOCK INTERNATIONAL GROUP PLC | 0.85% | 3.10% |
| CSG CLASS A NV | 0.66% | 1.25% |
| DASSAULT AVIATION SA | 0.49% | 4.14% |
| EXOSENS SA | 0.49% | 1.70% |
| Only in IDEF | Only in WDEF |
|---|---|
| RTX 6.55% | SAAB AB 4.83% |
| PALANTIR TECHNOLOGIES CLASS A 5.02% | INDRA SISTEMAS SA 2.98% |
| BLK CSH FND TREASURY SL AGENCY 3.77% | MELROSE INDUSTRIES PLC 2.54% |
| LOCKHEED MARTIN CORP 3.62% | EXAIL TECHNOLOGIES SA 1.34% |
| BOEING 3.19% | FINCANTIERI SPA 1.30% |
| GENERAL DYNAMICS CORP 2.94% | THEON INTERNATIONAL PLC 1.27% |
| NORTHROP GRUMMAN CORP 2.58% | SERCO GROUP PLC 0.94% |
| SPACE EXPLORATION TECHNOLOGIES COR 2.44% | OHB SE 0.78% |
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 Jun 30, 2026 and Sep 18, 2026.
Performance, window by window
| Window | Total return | vs the S&P 500 | vs the Nasdaq-100 | |||
|---|---|---|---|---|---|---|
| IDEF | WDEF | IDEF | WDEF | IDEF | WDEF | |
| 3 months | −1.6% | +2.9% | −3.9 pts | +0.7 pts | +0.9 pts | +5.4 pts |
| 6 months | −5.7% | −6.0% | −23.8 pts | −24.1 pts | −30.0 pts | −30.3 pts |
| 1 year | +4.4% | −7.6% | −12.2 pts | −24.1 pts | −17.4 pts | −29.4 pts |
| Since launch | +27.2% | −2.7% | −5.6 pts | −25.7 pts | −14.2 pts | −31.8 pts |
| IDEF iShares Defense Industrials Active ETF Holds 155 stocks in defense, 36% of its weight in S&P 500 companies | WDEF WisdomTree Europe Defense Fund Holds 42 stocks in defense, 0% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | iShares | WisdomTree |
| Theme | Defense | Defense |
| In the S&P 500 | 36.2% | 0.0% |
| Active share vs the S&P 500 | 95.9% | 100.0% |
| In the Nasdaq-100 | 9.2% | 0.0% |
| Holdings | 155 | 42 |
| Top ten, share of the fund | 35.8% | 63.9% |
| Expense ratio | not published | 0.45% |
| Fee for the differing part | not published | 0.45% |
| Total return, 1 year | +4.4% | −7.6% |
| vs the S&P 500 | −12.2 pts | −24.1 pts |
| vs the Nasdaq-100 | −17.4 pts | −29.4 pts |
| Below its high | −13.4% | −15.7% |
| Net assets | $4.3bn | $83m |
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 36% of the fund across 155 positions, as published by its issuer for Sep 18, 2026. Over the year to Sep 18, 2026 the fund returned +4.4% with distributions reinvested against +16.6% for the S&P 500, so a holder was behind by 12.2 pts. It sits 13.4% below its all-time high of Mar 2, 2026.
WDEF in plain words
By weight, 0% of WDEF's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 100%. The top ten holdings are 64% of the fund across 42 positions, as filed for Jun 30, 2026. Over the year to Sep 18, 2026 the fund returned −7.6% with distributions reinvested against +16.6% for the S&P 500, so a holder was behind by 24.1 pts. It sits 15.7% below its all-time high of Jan 27, 2026.
Questions people ask
- Do IDEF and WDEF hold the same stocks?
- By their latest filings, 21% 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, IDEF or WDEF?
- IDEF has 36% of its weight in S&P 500 names and WDEF has 0%, so WDEF 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 WDEF, data as of Sep 18, 2026. https://etfiq.com/compare/themes/idef-vs-wdef Free to use with attribution; the underlying files are at Open data.