Data as of .
AMMO vs IDEF: which is really different?
AMMO and IDEF hold 26% of their weight in the same names.
ETFIQ Off-Index Score: AMMO 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
26% of the two portfolios are the same securities at the same weight.
What they hold in common
By the books each fund has filed, AMMO and IDEF hold 26% of their money in the same securities at the same weight.
| Holding | AMMO | IDEF |
|---|---|---|
| Palantir Technologies Inc | 3.17% | 5.02% |
| Rolls-Royce Holdings PLC | 2.09% | 3.29% |
| LEONARDO-FINMECCANICA SPA | 1.81% | 1.60% |
| Rheinmetall AG | 3.76% | 1.15% |
| Safran SA | 1.05% | 1.30% |
| TransDigm Group Inc | 2.20% | 1.01% |
| Teledyne Technologies Inc | 1.96% | 0.82% |
| Howmet Aerospace Inc | 0.84% | 0.70% |
| Rocket Lab Corp | 1.62% | 0.70% |
| Carpenter Technology Corp | 1.66% | 0.67% |
| MACOM Technology Solutions Holdings Inc | 0.90% | 0.64% |
| TTM Technologies Inc | 2.49% | 0.55% |
| Only in AMMO | Only in IDEF |
|---|---|
| LIG Defense&Aerospace Co Ltd 4.80% | RTX 6.55% |
| Mildef Group AB 3.78% | BLK CSH FND TREASURY SL AGENCY 3.77% |
| Kitron ASA 3.50% | LOCKHEED MARTIN CORP 3.62% |
| Cohort PLC 2.76% | BOEING 3.19% |
| Elbit Systems Ltd 2.43% | GENERAL DYNAMICS CORP 2.94% |
| Theon International PLC 2.35% | NORTHROP GRUMMAN CORP 2.58% |
| Poongsan Corp 2.12% | AIRBUS GROUP 2.55% |
| Moog Inc 2.07% | SPACE EXPLORATION TECHNOLOGIES COR 2.44% |
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 18, 2026 and Sep 21, 2026.
Performance, window by window
| Window | Total return | vs the S&P 500 | vs the Nasdaq-100 | |||
|---|---|---|---|---|---|---|
| AMMO | IDEF | AMMO | IDEF | AMMO | IDEF | |
| 3 months | not published | −1.6% | not published | −3.9 pts | not published | +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 | +0.9% | +27.2% | −0.8 pts | −5.6 pts | −1.3 pts | −14.2 pts |
| AMMO VistaShares Defense Supercycle ETF Holds 52 stocks in defense, 13% 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 | VistaShares | iShares |
| Theme | Defense | Defense |
| In the S&P 500 | 12.6% | 36.2% |
| Active share vs the S&P 500 | 99.1% | 95.9% |
| In the Nasdaq-100 | 3.2% | 9.2% |
| Holdings | 52 | 155 |
| Top ten, share of the fund | 32.6% | 35.8% |
| Expense ratio | 0.75% | not published |
| Fee for the differing part | 0.76% | not published |
| Total return, 1 year | +0.9% (since launch on Jul 16, 2026) | +4.4% |
| vs the S&P 500 | −0.8 pts | −12.2 pts |
| vs the Nasdaq-100 | −1.3 pts | −17.4 pts |
| Below its high | −14.0% | −13.4% |
| Net assets | $3m | $4.3bn |
AMMO in plain words
By weight, 13% of AMMO's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 99%. The top ten holdings are 33% of the fund across 52 positions, as published by its issuer for Sep 21, 2026. Since it launched on Jul 16, 2026 the fund returned +0.9% with distributions reinvested against +1.7% for the S&P 500, so a holder was behind by 0.8 pts. It sits 14.0% below its all-time high of Aug 14, 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 AMMO and IDEF hold the same stocks?
- By their latest filings, 26% 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, AMMO or IDEF?
- AMMO has 13% of its weight in S&P 500 names and IDEF has 36%, so AMMO 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, AMMO against IDEF, data as of Sep 18, 2026. https://etfiq.com/compare/themes/ammo-vs-idef Free to use with attribution; the underlying files are at Open data.