Data as of Sep 13, 2026. Both funds on the fields they both publish, from the same sources.
IJR vs MDY: how they differ
IJR and MDY hold 0% of their weight in the same names, and IJR returned more over the year.
iShares Core S&P Small-Cap ETF and SPDR S&P MidCap 400 ETF Trust.
What they hold in common
By the books each fund has filed, IJR and MDY hold 0% of their money in the same securities at the same weight.
| Only in IJR | Only in MDY |
|---|---|
| BLK CSH FND TREASURY SL AGENCY 1.94% | Twilio Inc. Class A 1.00% |
| CORCEPT THERAPEUTICS 0.62% | Illumina Inc. 0.86% |
| VIASAT INC 0.57% | TechnipFMC plc 0.86% |
| GLAUKOS 0.57% | Everpure Inc. Class A 0.84% |
| MATCH GROUP INC 0.56% | Okta Inc. Class A 0.81% |
| BRINKER INTERNATIONAL INC 0.52% | U.S. Dollar 0.80% |
| QORVO 0.51% | ATI Inc 0.77% |
| PAYCOM SOFTWARE 0.51% | 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.
| IJR iShares Core S&P Small-Cap 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 | S&P SmallCap 600 | S&P MidCap 400 |
| Total return, 1 year | +19.9% | +13.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +2.4 pts | −4.5 pts |
| Expense ratio | 0.06% | 0.23% |
| Already in the S&P 500 | 0.0% | 0.0% |
| Holdings | 608 | 401 |
IJR in plain words
IJR is an index equity fund tracking the S&P SmallCap 600. Over the year to Sep 11, 2026 it returned +19.9% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.06% 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 608 positions, with the top ten at 6.8%. It sat 5.5% below its high of Aug 14, 2026 on Sep 11, 2026.
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, IJR or MDY?
- In the year to Sep 13, 2026, with distributions reinvested, IJR returned +19.9% and MDY returned +13.0%, so IJR returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IJR or MDY?
- IJR charges 0.06% a year and MDY charges 0.23%, so IJR is cheaper. Fees come from each fund's prospectus.
- How much do IJR and MDY overlap with the S&P 500?
- By their latest filed holdings, 0% of IJR 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, IJR against MDY, data as of Sep 13, 2026. https://etfiq.com/compare/any/ijr-vs-mdy Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources