Data as of Sep 13, 2026. Both funds on the fields they both publish, from the same sources.
IDEF vs VTI: how they differ
Over the year VTI returned more, +17.2% against +4.9%.
iShares Defense Industrials Active ETF and Vanguard Total Stock Market Index Fund.
What they hold in common
By the books each fund has filed, IDEF and VTI hold 0% of their money in the same securities at the same weight.
| Only in IDEF | Only in VTI |
|---|---|
| RTX 6.72% | NVIDIA Corp 6.37% |
| PALANTIR TECHNOLOGIES CLASS A 4.71% | Apple Inc 5.88% |
| LOCKHEED MARTIN CORP 3.62% | Microsoft Corp 3.84% |
| BOEING 3.32% | Amazon.com Inc 3.19% |
| ROLLS-ROYCE HOLDINGS PLC 3.30% | Alphabet Inc 2.90% |
| GENERAL DYNAMICS CORP 2.97% | Broadcom Inc 2.48% |
| USD CASH 2.72% | Alphabet Inc 2.29% |
| THALES SA 2.61% | Micron Technology Inc 1.80% |
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.
| IDEF iShares Defense Industrials Active ETF | VTI Vanguard Total Stock Market Index Fund | |
|---|---|---|
| Where it sits | Thematic ETF | Core index fund |
| Issuer | iShares | Vanguard |
| What it is | Defense | US total market |
| Total return, 1 year | +4.9% | +17.2% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −12.6 pts | −0.3 pts |
| Expense ratio | not published | 0.03% |
| Already in the S&P 500 | 36.1% | 88.3% |
| Holdings | 152 | 3531 |
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.
VTI in plain words
VTI is an index equity fund tracking the US total market. Over the year to Sep 11, 2026 it returned +17.2% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.03% a year. By its holdings filed for Jun 30, 2026, 88% of the fund by weight is stocks the S&P 500 also holds, across 3531 positions, with the top ten at 32.1%.
Questions people ask
- Which returned more over the last year, IDEF or VTI?
- In the year to Sep 13, 2026, with distributions reinvested, IDEF returned +4.9% and VTI returned +17.2%, so VTI returned more. One year is one year; the longer windows are in the table.
- How much do IDEF and VTI overlap with the S&P 500?
- By their latest filed holdings, 36% of IDEF and 88% of VTI by weight is stocks the S&P 500 already holds. Between the two funds, 0% of their books are the same securities at the same weight.
- Are IDEF and VTI the same kind of fund?
- No. IDEF is a thematic ETF and VTI is an index ETF, so they are built for different jobs. The table compares what both publish: return, cost and what each actually holds.
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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 VTI, data as of Sep 13, 2026. https://etfiq.com/compare/any/idef-vs-vti Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources