IVOO vs MDY: Differences, Returns & Fees
IVOO and MDY hold 95% of their weight in the same names. Net assets: $3.7bn on Sep 30, 2026 for Vanguard S&P Mid-Cap 400 ETF, and $25.8bn on Oct 20, 2026 for SPDR S&P MidCap 400 ETF Trust.
IVOO costs 0.16 points a year less; their one-year returns differ by 0.5 points; MDY is 6.8 times larger.
| IVOO | MDY | |
|---|---|---|
| Expense ratio | 0.07% | 0.23% |
| Net assets, as of Sep 30, 2026 | $3.7bn | $25.2bn |
| Total return, 1 year | +13.6% | +13.1% |
| What it tracks | S&P MidCap 400 Index | S&P MidCap 400 Index |
| Holdings in common | 95% | |
| Top ten holdings, share of the fund | 7.8% | 7.4% |
| Below its high | 6.7%, high on Aug 14, 2026 | |
Holdings in common uses holdings dated Sep 30, 2026 and Oct 19, 2026.
IVOO and MDY are built for the same job. How do they differ in cost, holdings and results?
- Cost. IVOO charges 0.07% of assets a year and MDY 0.23%, a gap of 0.16 points.
- Size. IVOO has $3.7bn in net assets and MDY $25.2bn (net assets, as of Sep 30, 2026); MDY is 6.8 times larger.
- What each follows (similar). Both follow S&P MidCap 400 Index.
Data as of Oct 20, 2026. The differences are picked by a fixed rule, in a fixed order; the PDF prints it. Page 2 has the returns, overlap, risks and sources.
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What they hold in common
By the books each fund has filed, IVOO and MDY hold 95% of their money in the same securities at the same weight. Holdings dated Sep 30, 2026 and Oct 19, 2026.
half
95% in common
On the same fields
IVOO and MDY on the fields both publish, as of Oct 20, 2026. Source: ETFIQ.
About IVOO
IVOO tracks an index. Over the year to Oct 20, 2026 it returned +13.6% with distributions reinvested, against +13.4% for its benchmark, the S&P MidCap 400 Index. The prospectus expense ratio is 0.07% a year. By its holdings published by its issuer as of Sep 30, 2026, 2% of the fund by weight is stocks the S&P 500 also holds, across 402 positions, with the top ten at 7.8%. It sat 6.7% below its high of Aug 14, 2026 on Oct 20, 2026.
About MDY
MDY tracks the S&P MidCap 400. Over the year to Oct 20, 2026 it returned +13.1% with distributions reinvested, against +13.4% 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 19, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 401 positions, with the top ten at 7.4%.
Questions people ask
- Which returned more over the last year, IVOO or MDY?
- In the year to Oct 20, 2026, with distributions reinvested, IVOO returned +13.6% and MDY +13.1%.
- Which is cheaper, IVOO or MDY?
- IVOO is cheaper, by 0.16 percentage points a year. That is about $16 on $10,000 held for a year. Fees come from each fund's prospectus.
ETFIQ links to the documents behind every figure; a link is not an endorsement. 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.
Cite this pageCitation, APA and Markdown
ETFIQ, IVOO against MDY, data as of Oct 20, 2026. https://etfiq.com/compare/any/ivoo-vs-mdy
ETFIQ. (Oct 20, 2026). IVOO against MDY. Retrieved from https://etfiq.com/compare/any/ivoo-vs-mdy
[IVOO against MDY (ETFIQ, Oct 20, 2026)](https://etfiq.com/compare/any/ivoo-vs-mdy)
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