Data as of .
IDEF vs SIL: which is really different?
IDEF holds 36.1% of its weight in S&P 500 companies and SIL 0.0%.
ETFIQ Off-Index Score: SIL 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 SIL hold 0% of their money in the same securities at the same weight.
| Only in IDEF | Only in SIL |
|---|---|
| RTX 6.72% | WHEATON PRECIOUS METALS CORP 24.16% |
| PALANTIR TECHNOLOGIES CLASS A 4.71% | PAN AMERICAN SILVER CORP 11.19% |
| LOCKHEED MARTIN CORP 3.62% | COEUR MINING INC 11.16% |
| BOEING 3.32% | HECLA MINING CO 4.96% |
| ROLLS-ROYCE HOLDINGS PLC 3.30% | INDUSTRIAS PENOLES SAB DE CV 4.62% |
| GENERAL DYNAMICS CORP 2.97% | FIRST MAJESTIC SILVER CORP 4.45% |
| USD CASH 2.72% | SSR MINING INC 4.16% |
| THALES SA 2.61% | FRESNILLO PLC 4.02% |
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 and Sep 11, 2026.
Performance, window by window
| Window | Total return | vs the S&P 500 | vs the Nasdaq-100 | |||
|---|---|---|---|---|---|---|
| IDEF | SIL | IDEF | SIL | IDEF | SIL | |
| 3 months | −1.9% | +18.1% | −5.2 pts | +14.8 pts | −1.1 pts | +18.9 pts |
| 6 months | −8.5% | +2.3% | −24.5 pts | −13.7 pts | −29.2 pts | −18.4 pts |
| 1 year | +4.9% | +49.1% | −12.6 pts | +31.6 pts | −18.1 pts | +26.1 pts |
| 3 years | not published | +298.1% | not published | +220.2 pts | not published | +203.0 pts |
| Since launch | +26.5% | +159.8% | −6.4 pts | −584.6 pts | −13.6 pts | −1393.6 pts |
| IDEF iShares Defense Industrials Active ETF Holds 152 stocks in defense, 36% of its weight in S&P 500 companies | SIL Global X Silver Miners ETF Holds 41 stocks in miners and metals, 0% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | iShares | Global X |
| Theme | Defense | Miners and metals |
| In the S&P 500 | 36.1% | 0.0% |
| Active share vs the S&P 500 | 95.9% | 100.0% |
| In the Nasdaq-100 | 8.5% | 0.0% |
| Holdings | 152 | 41 |
| Top ten, share of the fund | 35.2% | 76.1% |
| Expense ratio | not published | 0.65% |
| Fee for the differing part | not published | 0.65% |
| Total return, 1 year | +4.9% | +49.1% |
| vs the S&P 500 | −12.6 pts | +31.6 pts |
| vs the Nasdaq-100 | −18.1 pts | +26.1 pts |
| Below its high | −13.9% | −18.3% |
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.
SIL in plain words
By weight, 0% of SIL'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 76% of the fund across 41 positions, as published by its issuer for Sep 11, 2026. Over the year to Sep 11, 2026 the fund returned +49.1% with distributions reinvested against +17.5% for the S&P 500, so a holder was ahead by 31.6 pts. It sits 18.3% below its all-time high of Feb 27, 2026.
Questions people ask
- Which is more different from the S&P 500, IDEF or SIL?
- IDEF has 36% of its weight in S&P 500 names and SIL has 0%, so SIL 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 SIL, data as of Sep 11, 2026. https://etfiq.com/compare/themes/idef-vs-sil Free to use with attribution; the underlying files are at Open data.