MDY vs MDYG: Differences, Returns & Fees
MDY and MDYG hold 64% of their weight in the same names, and MDYG returned +14.9% over the year. Net assets on Oct 20, 2026: $25.8bn for SPDR S&P MidCap 400 ETF Trust and $2.8bn for State Street SPDR S & P 400 Mid Cap Growth ETF.
MDYG costs 0.08 points a year less; their one-year returns differ by 1.8 points; MDY is 9.2 times larger.
| MDY | MDYG | |
|---|---|---|
| Expense ratio | 0.23% | 0.15% |
| Net assets | $25.8bn | $2.8bn |
| Total return, 1 year | +13.1% | +14.9% |
| What it tracks | S&P MidCap 400 Index | S&P MidCap 400 Growth Index |
| Holdings in common | 64% | |
| Top ten holdings, share of the fund | 7.4% | 13.6% |
| Below its high | 6.7%, high on Aug 14, 2026 | 8.2%, high on Aug 17, 2026 |
Holdings in common uses holdings dated Oct 19, 2026.
MDY and MDYG are built for the same job. How do they differ in cost, holdings and results?
- What each follows. MDY follows S&P MidCap 400 Index and MDYG follows S&P MidCap 400 Growth Index.
- Size. MDY has $25.8bn in net assets and MDYG $2.8bn (Net assets); MDY is 9.2 times larger.
- Holdings in common (similar). 64% of the weight is in the same securities (holdings dated Oct 19, 2026).
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, MDY and MDYG hold 64% of their money in the same securities at the same weight. Holdings dated Oct 19, 2026.
half
64% in common
On the same fields
MDY and MDYG on the fields both publish, as of Oct 20, 2026. Source: ETFIQ.
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%. It sat 6.7% below its high of Aug 14, 2026 on Oct 20, 2026.
About MDYG
MDYG tracks an index. Over the year to Oct 20, 2026 it returned +14.9% with distributions reinvested, against +14.9% for its benchmark, the S&P MidCap 400 Growth Index. The prospectus expense ratio is 0.15% 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 247 positions, with the top ten at 13.6%. It sat 8.2% below its high of Aug 17, 2026 on Oct 20, 2026.
Questions people ask
- Which returned more over the last year, MDY or MDYG?
- In the year to Oct 20, 2026, with distributions reinvested, MDY returned +13.1% and MDYG +14.9%.
- Which is cheaper, MDY or MDYG?
- MDYG is cheaper, by 0.08 percentage points a year. That is about $8 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.
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ETFIQ, MDY against MDYG, data as of Oct 20, 2026. https://etfiq.com/compare/any/mdy-vs-mdyg
ETFIQ. (Oct 20, 2026). MDY against MDYG. Retrieved from https://etfiq.com/compare/any/mdy-vs-mdyg
[MDY against MDYG (ETFIQ, Oct 20, 2026)](https://etfiq.com/compare/any/mdy-vs-mdyg)
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