Data as of Oct 28, 2026.
DFUS vs MBB: Differences, Returns & Fees
Over the year to Oct 28, 2026, DFUS returned +13.8% to MBB's −0.8%; 0% of their weight is in the same names.
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Net assets: $20.9bn on Jul 31, 2026 for Dimensional U.S. Equity Market ETF, and $35.5bn on Oct 28, 2026 for iShares MBS ETF.
Pair scorecard
MBB costs 0.05 points a year less; their one-year returns differ by 14.6 points.
| Measure | DFUS | MBB |
|---|---|---|
| Return | ||
| Total return, 1 year | +13.8% | −0.8% |
| Benchmark | ||
| What it tracks | No index, actively managed | Bloomberg U.S. MBS Index |
| Cost and size | ||
| Expense ratio | 0.09% | 0.04% |
| Net assets, DFUS as of Jul 31, 2026 and MBB as of Oct 28, 2026 | $20.9bn | $35.5bn |
| Holdings | ||
| Holdings in common | 0% | |
| In the S&P 500, by weight | 89% | |
| Top ten holdings, share of the fund | 34.6% | |
Holdings in common uses holdings dated Jul 31, 2026 and Oct 27, 2026. Method
What they share
By the books each fund has filed, DFUS and MBB hold 0% of their money in the same securities at the same weight. Holdings dated Jul 31, 2026 and Oct 27, 2026.
half
0% in common
Only in one fund ↓
Side by side
DFUS and MBB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
Over the year to Oct 28, 2026 it returned +13.8% with distributions reinvested, against +13.3% for its benchmark, the Russell 3000 Index.
DFUS is actively managed and tracks no index. The prospectus expense ratio is 0.09% a year. By its holdings filed for Jul 31, 2026, 89% of the fund by weight is stocks the S&P 500 also holds, across 2,236 positions, with the top ten at 34.6%.
MBB
MBB tracks an index of mortgage-backed securities. Over the year to Oct 28, 2026 it returned −0.8% with distributions reinvested, against −1.1% for its benchmark, the Bloomberg U.S. MBS Index. The prospectus expense ratio is 0.04% a year.
Questions people ask
- Which returned more over the last year, DFUS or MBB?
- In the year to Oct 28, 2026, with distributions reinvested, DFUS returned +13.8% and MBB −0.8%.
- Which is cheaper, DFUS or MBB?
- MBB is cheaper, by 0.05 percentage points a year. That is about $5 on $10,000 held for a year. Fees come from each fund's prospectus.
Links are sources, not endorsements. A comparison is not a recommendation.
How this is computed
Overlap adds up the smaller of the two weights for each security both funds hold.
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ETFIQ, DFUS against MBB, data as of Oct 28, 2026. https://etfiq.com/compare/any/dfus-vs-mbb
ETFIQ. (Oct 28, 2026). DFUS against MBB. Retrieved from https://etfiq.com/compare/any/dfus-vs-mbb
[DFUS against MBB (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/dfus-vs-mbb)
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