Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
DYNF vs MDY: how they differ
DYNF and MDY hold 1% of their weight in the same names, and DYNF returned more over the year.
iShares U.S. Equity Factor Rotation Active ETF and SPDR S&P MidCap 400 ETF Trust.
What they hold in common
By the books each fund has filed, DYNF and MDY hold 1% of their money in the same securities at the same weight.
| Holding | DYNF | MDY |
|---|---|---|
| Penumbra Inc | 0.14% | 0.34% |
| ATI Inc | 0.06% | 0.74% |
| Woodward Inc | 0.06% | 0.70% |
| Carpenter Technology Corp | 0.04% | 0.85% |
| Omega Healthcare Investors Inc | 0.03% | 0.39% |
| MasTec Inc | 0.03% | 0.71% |
| Halozyme Therapeutics Inc | 0.03% | 0.26% |
| RBC Bearings Inc | 0.03% | 0.56% |
| CACI International Inc | 0.02% | 0.28% |
| Planet Fitness Inc | 0.02% | 0.11% |
| API Group Corp | 0.02% | 0.45% |
| Exelixis Inc | 0.02% | 0.38% |
| Only in DYNF | Only in MDY |
|---|---|
| NVIDIA Corp 8.62% | TWILIO INC 0.86% |
| Apple Inc 7.75% | MKS INC 0.83% |
| Microsoft Corp 5.35% | CURTISS-WRIGHT CORP 0.77% |
| Amazon.com Inc 4.42% | ENTEGRIS INC 0.76% |
| JPMorgan Chase & Co 3.59% | NVENT ELECTRIC PLC 0.76% |
| Broadcom Inc 3.25% | ILLUMINA INC 0.73% |
| Alphabet Inc 2.87% | TECHNIPFMC PLC 0.73% |
| Cisco Systems Inc 2.76% | STERLING INFRASTRUCTURE INC 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 Apr 30, 2026 and Jun 30, 2026.
| DYNF iShares U.S. Equity Factor Rotation Active 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 | U.S. Equity Factor Rotation Active | S&P MidCap 400, book from IJH |
| Total return, 1 year | +20.8% | +13.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +3.3 pts | −4.5 pts |
| Expense ratio | 0.26% | 0.23% |
| Already in the S&P 500 | 98.8% | 0.0% |
| Holdings | 187 | 400 |
DYNF in plain words
DYNF is an index equity fund tracking the U.S. Equity Factor Rotation Active. Over the year to Sep 11, 2026 it returned +20.8% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.26% a year. By its holdings filed for Apr 30, 2026, 99% of the fund by weight is stocks the S&P 500 also holds, across 187 positions, with the top ten at 43.8%.
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, DYNF or MDY?
- In the year to Sep 12, 2026, with distributions reinvested, DYNF returned +20.8% and MDY returned +13.0%, so DYNF returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, DYNF or MDY?
- DYNF charges 0.26% a year and MDY charges 0.23%, so MDY is cheaper. Fees come from each fund's prospectus.
- How much do DYNF and MDY overlap with the S&P 500?
- By their latest filed holdings, 99% of DYNF and 0% of MDY by weight is stocks the S&P 500 already holds. Between the two funds, 1% 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, DYNF against MDY, data as of Sep 12, 2026. https://etfiq.com/compare/any/DYNF-MDY Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources