Data as of .
DUTY vs IDEF: which is really different?
DUTY and IDEF hold 25% of their weight in the same names.
ETFIQ Off-Index Score: DUTY 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
25% of the two portfolios are the same securities at the same weight.
What they hold in common
By the books each fund has filed, DUTY and IDEF hold 25% of their money in the same securities at the same weight.
| Holding | DUTY | IDEF |
|---|---|---|
| Palantir Technologies Inc | 5.98% | 5.02% |
| Lockheed Martin Corp | 7.34% | 3.62% |
| General Dynamics Corp | 7.57% | 2.94% |
| Northrop Grumman Corp | 6.62% | 2.58% |
| Palo Alto Networks Inc | 5.21% | 1.66% |
| Crowdstrike Holdings Inc | 4.64% | 1.37% |
| Teledyne Technologies Inc | 4.35% | 0.82% |
| Fortinet Inc | 4.92% | 0.76% |
| Rocket Lab Corp | 5.35% | 0.70% |
| Huntington Ingalls Industries | 2.45% | 0.46% |
| AeroVironment Inc | 1.04% | 0.45% |
| Kratos Defense & Security Solu | 2.06% | 0.45% |
| Only in DUTY | Only in IDEF |
|---|---|
| Okta Inc 4.62% | RTX 6.55% |
| Akamai Technologies Inc 3.15% | BLK CSH FND TREASURY SL AGENCY 3.77% |
| Check Point Software Technolog 2.89% | ROLLS-ROYCE HOLDINGS PLC 3.29% |
| Moog Inc 2.54% | BOEING 3.19% |
| CACI International Inc 2.28% | AIRBUS GROUP 2.55% |
| Rubrik Inc 2.11% | SPACE EXPLORATION TECHNOLOGIES COR 2.44% |
| SentinelOne Inc 1.03% | HANWHA AEROSPACE LTD 2.21% |
| Qualys Inc 0.95% | BAE SYSTEMS PLC 2.18% |
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 | |||
|---|---|---|---|---|---|---|
| DUTY | IDEF | DUTY | IDEF | DUTY | IDEF | |
| 3 months | +5.7% | −1.6% | +3.5 pts | −3.9 pts | +8.2 pts | +0.9 pts |
| 6 months | not published | −5.7% | not published | −23.8 pts | not published | −30.0 pts |
| 1 year | not published | +4.4% | not published | −12.2 pts | not published | −17.4 pts |
| Since launch | +6.9% | +27.2% | −6.3 pts | −5.6 pts | −12.3 pts | −14.2 pts |
| DUTY U.S. Defense ETF Holds 50 stocks in defense, 62% of its weight in S&P 500 companies | IDEF iShares Defense Industrials Active ETF Holds 155 stocks in defense, 36% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | Aura | iShares |
| Theme | Defense | Defense |
| In the S&P 500 | 61.8% | 36.2% |
| Active share vs the S&P 500 | 98.1% | 95.9% |
| In the Nasdaq-100 | 23.5% | 9.2% |
| Holdings | 50 | 155 |
| Top ten, share of the fund | 59.1% | 35.8% |
| Expense ratio | 0.45% | not published |
| Fee for the differing part | 0.46% | not published |
| Total return, 1 year | +6.9% (since launch on Apr 8, 2026) | +4.4% |
| vs the S&P 500 | −6.3 pts | −12.2 pts |
| vs the Nasdaq-100 | −12.3 pts | −17.4 pts |
| Below its high | −9.2% | −13.4% |
| Net assets | $2m | $4.3bn |
DUTY in plain words
By weight, 62% of DUTY's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 98%. The top ten holdings are 59% of the fund across 50 positions, as filed for Jun 30, 2026. Since it launched on Apr 8, 2026 the fund returned +6.9% with distributions reinvested against +13.2% for the S&P 500, so a holder was behind by 6.3 pts. It sits 9.2% below its all-time high of Aug 13, 2026.
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.
Questions people ask
- Do DUTY and IDEF hold the same stocks?
- By their latest filings, 25% 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, DUTY or IDEF?
- DUTY has 62% of its weight in S&P 500 names and IDEF has 36%, so DUTY 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, DUTY against IDEF, data as of Sep 18, 2026. https://etfiq.com/compare/themes/duty-vs-idef Free to use with attribution; the underlying files are at Open data.