Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IDEV vs MDY: how they differ
IDEV and MDY hold 0% of their weight in the same names, and IDEV returned more over the year.
iShares Core MSCI International Developed Markets ETF and SPDR S&P MidCap 400 ETF Trust.
What they hold in common
By the books each fund has filed, IDEV and MDY hold 0% of their money in the same securities at the same weight.
| Holding | IDEV | MDY |
|---|---|---|
| RB Global, Inc. | 0.07% | 0.60% |
| Only in IDEV | Only in MDY |
|---|---|
| ASML Holding N.V. 1.95% | TWILIO INC 0.86% |
| HSBC HOLDINGS PLC 1.09% | CARPENTER TECHNOLOGY CORP 0.85% |
| ASTRAZENECA PLC 1.02% | MKS INC 0.83% |
| Novartis AG 0.97% | CURTISS-WRIGHT CORP 0.77% |
| SHELL PLC 0.90% | ENTEGRIS INC 0.76% |
| Nestle S.A. 0.90% | NVENT ELECTRIC PLC 0.76% |
| ROYAL BANK OF CANADA 0.87% | ATI INC 0.74% |
| Siemens Aktiengesellschaft 0.78% | ILLUMINA INC 0.73% |
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 Apr 30, 2026 and Jun 30, 2026.
| IDEV iShares Core MSCI International Developed Markets 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 | Core MSCI International Developed Markets | S&P MidCap 400, book from IJH |
| Total return, 1 year | +18.7% | +13.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +1.2 pts | −4.5 pts |
| Expense ratio | 0.04% | 0.23% |
| Already in the S&P 500 | 0.1% | 0.0% |
| Holdings | 2268 | 400 |
IDEV in plain words
IDEV is an index equity fund tracking the Core MSCI International Developed Markets. Over the year to Sep 11, 2026 it returned +18.7% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.04% a year. By its holdings filed for Apr 30, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 2268 positions, with the top ten at 10.2%.
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 Jun 30, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 400 positions, with the top ten at 7.7%. 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, IDEV or MDY?
- In the year to Sep 12, 2026, with distributions reinvested, IDEV returned +18.7% and MDY returned +13.0%, so IDEV returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IDEV or MDY?
- IDEV charges 0.04% a year and MDY charges 0.23%, so IDEV is cheaper. Fees come from each fund's prospectus.
- How much do IDEV and MDY overlap with the S&P 500?
- By their latest filed holdings, 0% of IDEV 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.
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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, IDEV against MDY, data as of Sep 12, 2026. https://etfiq.com/compare/any/IDEV-MDY Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources