Data as of Sep 13, 2026. Both funds on the fields they both publish, from the same sources.
ACWX vs MDY: how they differ
ACWX and MDY hold 0% of their weight in the same names, and ACWX returned more over the year.
iShares MSCI ACWI ex U.S. ETF and SPDR S&P MidCap 400 ETF Trust.
What they hold in common
By the books each fund has filed, ACWX and MDY hold 0% of their money in the same securities at the same weight.
| Only in ACWX | Only in MDY |
|---|---|
| TAIWAN SEMICONDUCTOR MANUFACTURING 5.09% | Twilio Inc. Class A 1.00% |
| SAMSUNG ELECTRONICS LTD 2.50% | Illumina Inc. 0.86% |
| SK HYNIX 2.04% | TechnipFMC plc 0.86% |
| ASML HOLDING 1.77% | Everpure Inc. Class A 0.84% |
| HSBC HOLDINGS PLC 0.94% | Okta Inc. Class A 0.81% |
| TENCENT HOLDINGS 0.88% | U.S. Dollar 0.80% |
| ROCHE PS PAR AG 0.79% | ATI Inc 0.77% |
| ROYAL BANK OF CANADA 0.76% | nVent Electric plc 0.71% |
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 Sep 10, 2026.
| ACWX iShares MSCI ACWI ex U.S. ETF | MDY SPDR S&P MidCap 400 ETF Trust | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | State Street |
| What it is | MSCI ACWI ex U.S. | S&P MidCap 400 |
| Total return, 1 year | +23.0% | +13.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +5.5 pts | −4.5 pts |
| Expense ratio | 0.32% | 0.23% |
| Already in the S&P 500 | 0.0% | 0.0% |
| Holdings | 1515 | 401 |
ACWX in plain words
ACWX is an index equity fund tracking the MSCI ACWI ex U.S.. Over the year to Sep 11, 2026 it returned +23.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.32% 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 1515 positions, with the top ten at 16.1%.
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.
Questions people ask
- Which returned more over the last year, ACWX or MDY?
- In the year to Sep 13, 2026, with distributions reinvested, ACWX returned +23.0% and MDY returned +13.0%, so ACWX returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, ACWX or MDY?
- ACWX charges 0.32% a year and MDY charges 0.23%, so MDY is cheaper. Fees come from each fund's prospectus.
- How much do ACWX and MDY overlap with the S&P 500?
- By their latest filed holdings, 0% of ACWX and 0% of MDY 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.
Other comparisons
Where to next
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, ACWX against MDY, data as of Sep 13, 2026. https://etfiq.com/compare/any/acwx-vs-mdy Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources