Data as of .
IDEF vs TSSD: which is really different?
IDEF and TSSD hold 33% of their weight in the same names.
ETFIQ Off-Index Score: TSSD 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
33% 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 TSSD hold 33% of their money in the same securities at the same weight.
| Holding | IDEF | TSSD |
|---|---|---|
| RTX | 6.55% | 7.08% |
| PALANTIR TECHNOLOGIES CLASS A | 5.02% | 6.78% |
| LOCKHEED MARTIN CORP | 3.62% | 5.51% |
| GENERAL DYNAMICS CORP | 2.94% | 4.91% |
| NORTHROP GRUMMAN CORP | 2.58% | 4.00% |
| PALO ALTO NETWORKS | 1.66% | 9.71% |
| CROWDSTRIKE HOLDINGS CLASS A | 1.37% | 7.25% |
| TELEDYNE TECHNOLOGIES INC | 0.82% | 2.90% |
| FORTINET | 0.76% | 5.76% |
| BWX TECHNOLOGIES INC | 0.50% | 1.72% |
| HUNTINGTON INGALLS INDUSTRIES | 0.46% | 0.88% |
| AEROVIRONMENT | 0.45% | 0.64% |
| Only in IDEF | Only in TSSD |
|---|---|
| BLK CSH FND TREASURY SL AGENCY 3.77% | Cloudflare Inc 4.76% |
| ROLLS-ROYCE HOLDINGS PLC 3.29% | Axon Enterprise Inc 4.58% |
| BOEING 3.19% | Okta Inc 2.12% |
| AIRBUS GROUP 2.55% | VeriSign Inc 2.06% |
| SPACE EXPLORATION TECHNOLOGIES COR 2.44% | F5 Inc 1.79% |
| HANWHA AEROSPACE LTD 2.21% | Akamai Technologies Inc 1.72% |
| BAE SYSTEMS PLC 2.18% | Gen Digital Inc 1.20% |
| THALES SA 2.18% | Moog Inc 1.00% |
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 | TSSD | IDEF | TSSD | IDEF | TSSD | |
| 3 months | −1.6% | +12.0% | −3.9 pts | +9.7 pts | +0.9 pts | +14.5 pts |
| 6 months | −5.7% | +18.0% | −23.8 pts | −0.1 pts | −30.0 pts | −6.3 pts |
| 1 year | +4.4% | not published | −12.2 pts | not published | −17.4 pts | not published |
| Since launch | +27.2% | +20.2% | −5.6 pts | +8.4 pts | −14.2 pts | +3.4 pts |
| IDEF iShares Defense Industrials Active ETF Holds 155 stocks in defense, 36% of its weight in S&P 500 companies | TSSD Truth Social American Security & Defense ETF Holds 62 stocks in defense, 72% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | iShares | Yorkville |
| Theme | Defense | Defense |
| In the S&P 500 | 36.2% | 71.5% |
| Active share vs the S&P 500 | 95.9% | 97.5% |
| In the Nasdaq-100 | 9.2% | 35.8% |
| Holdings | 155 | 62 |
| Top ten, share of the fund | 35.8% | 60.4% |
| Expense ratio | not published | 0.65% |
| Fee for the differing part | not published | 0.67% |
| Total return, 1 year | +4.4% | +20.2% (since launch on Dec 30, 2025) |
| vs the S&P 500 | −12.2 pts | +8.4 pts |
| vs the Nasdaq-100 | −17.4 pts | +3.4 pts |
| Below its high | −13.4% | −7.1% |
| Net assets | $4.3bn | $7m |
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.
TSSD in plain words
By weight, 72% of TSSD'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 60% of the fund across 62 positions, as filed for Jun 30, 2026. Since it launched on Dec 30, 2025 the fund returned +20.2% with distributions reinvested against +11.7% for the S&P 500, so a holder was ahead by 8.4 pts. It sits 7.1% below its all-time high of Aug 13, 2026.
Questions people ask
- Do IDEF and TSSD hold the same stocks?
- By their latest filings, 33% 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 TSSD?
- IDEF has 36% of its weight in S&P 500 names and TSSD has 72%, so TSSD 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 TSSD, data as of Sep 18, 2026. https://etfiq.com/compare/themes/idef-vs-tssd Free to use with attribution; the underlying files are at Open data.