Data as of Sep 13, 2026. Both funds on the fields they both publish, from the same sources.
MDY vs VUG: how they differ
MDY and VUG hold 0% of their weight in the same names.
SPDR S&P MidCap 400 ETF Trust and Vanguard Growth Index Fund.
What they hold in common
By the books each fund has filed, MDY and VUG hold 0% of their money in the same securities at the same weight.
| Only in MDY | Only in VUG |
|---|---|
| Twilio Inc. Class A 1.00% | NVIDIA Corp 12.63% |
| Illumina Inc. 0.86% | Apple Inc 11.67% |
| TechnipFMC plc 0.86% | Microsoft Corp 7.62% |
| Everpure Inc. Class A 0.84% | Alphabet Inc 5.76% |
| Okta Inc. Class A 0.81% | Alphabet Inc 4.54% |
| U.S. Dollar 0.80% | Amazon.com Inc 4.47% |
| ATI Inc 0.77% | Broadcom Inc 4.29% |
| nVent Electric plc 0.71% | Meta Platforms Inc 3.41% |
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.
| MDY SPDR S&P MidCap 400 ETF Trust | VUG Vanguard Growth Index Fund | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | State Street | Vanguard |
| What it is | S&P MidCap 400 | US growth |
| Total return, 1 year | +13.0% | +12.9% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −4.5 pts | −4.6 pts |
| Expense ratio | 0.23% | 0.03% |
| Already in the S&P 500 | 0.0% | 97.4% |
| Holdings | 401 | 147 |
MDY in plain words
MDY is an index equity fund tracking the S&P MidCap 400. Over the year to Sep 11, 2026 it returned +13.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.23% a year. By its holdings filed for Sep 10, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 401 positions, with the top ten at 7.9%. It sat 5.3% below its high of Aug 14, 2026 on Sep 11, 2026.
VUG in plain words
VUG is an index equity fund tracking the US growth. Over the year to Sep 11, 2026 it returned +12.9% 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, 97% of the fund by weight is stocks the S&P 500 also holds, across 147 positions, with the top ten at 60.5%.
Questions people ask
- Which returned more over the last year, MDY or VUG?
- In the year to Sep 13, 2026, with distributions reinvested, MDY returned +13.0% and VUG returned +12.9%, so MDY returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, MDY or VUG?
- MDY charges 0.23% a year and VUG charges 0.03%, so VUG is cheaper. Fees come from each fund's prospectus.
- How much do MDY and VUG overlap with the S&P 500?
- By their latest filed holdings, 0% of MDY and 97% of VUG 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.
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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, MDY against VUG, data as of Sep 13, 2026. https://etfiq.com/compare/any/mdy-vs-vug Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources