Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
ITOT vs MDY: how they differ
ITOT and MDY hold 5% of their weight in the same names, and ITOT returned more over the year.
iShares Core S&P Total U.S. Stock Market ETF and SPDR S&P MidCap 400 ETF Trust.
What they hold in common
By the books each fund has filed, ITOT and MDY hold 5% of their money in the same securities at the same weight.
| Holding | ITOT | MDY |
|---|---|---|
| Twilio, Inc. | 0.04% | 0.86% |
| Carpenter Technology Corp. | 0.04% | 0.85% |
| MKS, Inc. | 0.04% | 0.83% |
| Curtiss-Wright Corp. | 0.04% | 0.77% |
| Entegris, Inc. | 0.04% | 0.76% |
| ATI, Inc. | 0.04% | 0.74% |
| Illumina, Inc. | 0.04% | 0.73% |
| MasTec, Inc. | 0.04% | 0.71% |
| Sterling Infrastructure, Inc. | 0.04% | 0.71% |
| Woodward, Inc. | 0.04% | 0.70% |
| Everpure, Inc. | 0.03% | 0.69% |
| MACOM Technology Solutions Holdings, Inc | 0.03% | 0.69% |
| Only in ITOT | Only in MDY |
|---|---|
| NVIDIA Corp. 6.64% | NVENT ELECTRIC PLC 0.76% |
| Apple, Inc. 5.82% | TECHNIPFMC PLC 0.73% |
| Microsoft Corp. 3.80% | FABRINET 0.56% |
| Amazon.com, Inc. 3.20% | ROIVANT SCIENCES LTD 0.44% |
| Alphabet, Inc. 2.87% | JAZZ PHARMACEUTICALS PLC 0.42% |
| Broadcom, Inc. 2.45% | RENAISSANCERE HOLDINGS LTD 0.37% |
| Alphabet, Inc. 2.29% | SHARKNINJA INC 0.30% |
| Micron Technology, Inc. 1.78% | CNH INDUSTRIAL NV 0.27% |
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.
| ITOT iShares Core S&P Total U.S. Stock Market 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 S&P Total U.S. Stock Market | S&P MidCap 400, book from IJH |
| Total return, 1 year | +17.2% | +13.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −0.3 pts | −4.5 pts |
| Expense ratio | 0.03% | 0.23% |
| Already in the S&P 500 | 88.3% | 0.0% |
| Holdings | 2497 | 400 |
ITOT in plain words
ITOT is an index equity fund tracking the Core S&P Total U.S. Stock Market. Over the year to Sep 11, 2026 it returned +17.2% 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, 88% of the fund by weight is stocks the S&P 500 also holds, across 2497 positions, with the top ten at 32.2%.
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, ITOT or MDY?
- In the year to Sep 12, 2026, with distributions reinvested, ITOT returned +17.2% and MDY returned +13.0%, so ITOT returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, ITOT or MDY?
- ITOT charges 0.03% a year and MDY charges 0.23%, so ITOT is cheaper. Fees come from each fund's prospectus.
- How much do ITOT and MDY overlap with the S&P 500?
- By their latest filed holdings, 88% of ITOT and 0% of MDY by weight is stocks the S&P 500 already holds. Between the two funds, 5% of their books are the same securities at the same weight.
Other comparisons
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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, ITOT against MDY, data as of Sep 12, 2026. https://etfiq.com/compare/any/ITOT-MDY Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources