Data as of .
DRAM vs IDEF: which is really different?
IDEF holds 36.1% of its weight in S&P 500 companies and DRAM 20.0%.
ETFIQ Off-Index Score: DRAM 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, DRAM and IDEF hold 0% of their money in the same securities at the same weight.
| Only in DRAM | Only in IDEF |
|---|---|
| TREASURY BILL 27.17% | RTX 6.72% |
| SK hynix Inc 20.19% | PALANTIR TECHNOLOGIES CLASS A 4.71% |
| Samsung Electronics Co Ltd 18.26% | LOCKHEED MARTIN CORP 3.62% |
| Sandisk Corp 6.62% | BOEING 3.32% |
| Kioxia Holdings Corp 5.54% | ROLLS-ROYCE HOLDINGS PLC 3.30% |
| Western Digital Corp 5.46% | GENERAL DYNAMICS CORP 2.97% |
| Seagate Technology Holdings PL 5.32% | USD CASH 2.72% |
| GigaDevice Semiconductor Inc 3.90% | THALES SA 2.61% |
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 10, 2026.
Performance, window by window
| Window | Total return | vs the S&P 500 | vs the Nasdaq-100 | |||
|---|---|---|---|---|---|---|
| DRAM | IDEF | DRAM | IDEF | DRAM | IDEF | |
| 3 months | −9.1% | −1.9% | −12.4 pts | −5.2 pts | −8.3 pts | −1.1 pts |
| 6 months | not published | −8.5% | not published | −24.5 pts | not published | −29.2 pts |
| 1 year | not published | +4.9% | not published | −12.6 pts | not published | −18.1 pts |
| Since launch | +112.9% | +26.5% | +96.1 pts | −6.4 pts | +90.6 pts | −13.6 pts |
| DRAM Roundhill Memory ETF Holds 13 stocks in memory and storage, 20% of its weight in S&P 500 companies | IDEF iShares Defense Industrials Active ETF Holds 152 stocks in defense, 36% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | Roundhill | iShares |
| Theme | Memory and storage | Defense |
| In the S&P 500 | 20.0% | 36.1% |
| Active share vs the S&P 500 | 96.8% | 95.9% |
| In the Nasdaq-100 | 20.0% | 8.5% |
| Holdings | 13 | 152 |
| Top ten, share of the fund | 97.3% | 35.2% |
| Expense ratio | 0.65% | not published |
| Fee for the differing part | 0.67% | not published |
| Total return, 1 year | +112.9% (since launch on Apr 2, 2026) | +4.9% |
| vs the S&P 500 | +96.1 pts | −12.6 pts |
| vs the Nasdaq-100 | +90.6 pts | −18.1 pts |
| Below its high | −26.8% | −13.9% |
DRAM in plain words
By weight, 20% of DRAM's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 97%. The top ten holdings are 97% of the fund across 13 positions, as filed for Jun 30, 2026. Since it launched on Apr 2, 2026 the fund returned +112.9% with distributions reinvested against +16.8% for the S&P 500, so a holder was ahead by 96.1 pts. It sits 26.8% below its all-time high of Jun 22, 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 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.
Questions people ask
- Which is more different from the S&P 500, DRAM or IDEF?
- DRAM has 20% of its weight in S&P 500 names and IDEF has 36%, so DRAM 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, DRAM against IDEF, data as of Sep 11, 2026. https://etfiq.com/compare/themes/dram-vs-idef Free to use with attribution; the underlying files are at Open data.