Data as of Oct 28, 2026.
AGG vs MDY: Differences, Returns & Fees
Over the year to Oct 28, 2026, AGG returned −1.4% to MDY's +12.8%; 0% of their weight is in the same names.
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Net assets on Oct 27, 2026: $139.4bn for iShares Core U.S. Aggregate Bond ETF and $25.9bn for SPDR S&P MidCap 400 ETF Trust.
Pair scorecard
AGG costs 0.20 points a year less; their one-year returns differ by 14.2 points; AGG is 5.4 times larger.
| Measure | AGG | MDY |
|---|---|---|
| Return | ||
| Total return, 1 year | −1.4% | +12.8% |
| Drawdown | ||
| Below its high | 3.4%, high on Aug 4, 2020 | 6.5%, high on Aug 14, 2026 |
| Benchmark | ||
| What it tracks | Bloomberg U.S. Aggregate Bond Index | S&P MidCap 400 Index |
| Cost and size | ||
| Expense ratio | 0.03% | 0.23% |
| Net assets, as of Oct 27, 2026 | $139.4bn | $25.9bn |
| Holdings | ||
| Holdings in common | 0% | |
| In the S&P 500, by weight | 0% | |
| Top ten holdings, share of the fund | 7.5% | |
Holdings in common uses holdings dated Oct 27, 2026. Method
What they share
By the books each fund has filed, AGG and MDY hold 0% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.
half
0% in common
Only in one fund ↓
Side by side
AGG and MDY on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
AGG
AGG tracks an index of US aggregate bonds. Over the year to Oct 28, 2026 it returned −1.4% with distributions reinvested, against −1.3% for its benchmark, the Bloomberg U.S. Aggregate Bond Index. The prospectus expense ratio is 0.03% a year. It sat 3.4% below its high of Aug 4, 2020 on Oct 28, 2026.
MDY
MDY tracks the S&P MidCap 400. Over the year to Oct 28, 2026 it returned +12.8% with distributions reinvested, against +13.2% for its benchmark, the S&P MidCap 400 Index. The prospectus expense ratio is 0.23% a year. By its holdings published by its issuer for Oct 27, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 401 positions, with the top ten at 7.5%. It sat 6.5% below its high of Aug 14, 2026 on Oct 28, 2026.
Questions people ask
- Which returned more over the last year, AGG or MDY?
- In the year to Oct 28, 2026, with distributions reinvested, AGG returned −1.4% and MDY +12.8%.
- Which is cheaper, AGG or MDY?
- AGG is cheaper, by 0.20 percentage points a year. That is about $20 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, AGG against MDY, data as of Oct 28, 2026. https://etfiq.com/compare/any/agg-vs-mdy
ETFIQ. (Oct 28, 2026). AGG against MDY. Retrieved from https://etfiq.com/compare/any/agg-vs-mdy
[AGG against MDY (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/agg-vs-mdy)
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