IJH vs MDY overlap - what they share and where they differ
IJH and MDY share 99.5% of their weight across 400 common positions, read from what each fund reported to the SEC.
Each week Ploutos reads the reported positions of the largest US equity ETFs and measures, pair by pair, the weight they share: for every stock both funds hold, the smaller of the two weights counts. Two funds tracking the same index land near 100%. A sector fund inside a broad index fund lands at roughly that sector's weight.
IJH and MDY
99.5%
400 shared positions
IJH
iShares Core S&P Mid-Cap ETF
Reported positions cover 100% of the fund, 400 positions · Jun 30, 2026
Top 10: 7.7%·Holdings of IJH
MDY
State Street SPDR S&P MidCap 400SM ETF Trust
Reported positions cover 99% of the fund, 400 positions · Jun 30, 2026
Top 10: 7.7%·Holdings of MDY
Reported positions cover IJH 100%, MDY 99% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
MDY vs IJH side by side
IJHiShares Core S&P Mid-Cap ETF
400
stock positions reported to the SEC
0.0% of its weight is in 0 names MDY does not hold
MDYState Street SPDR S&P MidCap 400SM ETF Trust
400
stock positions reported to the SEC
0.0% of its weight is in 0 names IJH does not hold
Where each fund's weight sits
Largest sectors for both funds
No sector differs by more than a point between the two.
The figures side by side
| IJH | MDY | |
|---|---|---|
| Filing date | Jun 30, 2026 | Jun 30, 2026 |
| Stock positions reported | 400 | 400 |
| Weight of the ten largest | 7.7% | 7.7% |
| Largest position | TWLO 0.9% | TWLO 0.9% |
| Held alone | 0 positions, 0.0% | 0 positions, 0.0% |
| Covered by stock positions | 100% | 99% |
Holdings they share
| Stock | In IJH | In MDY | Counted |
|---|---|---|---|
| TWLOTWILIO INC | 0.86% | 0.86% | 0.86% |
| CRSCARPENTER TECHNOLOGY CORP | 0.84% | 0.84% | 0.84% |
| MKSIMKS INC | 0.83% | 0.82% | 0.82% |
| CWCURTISS-WRIGHT CORP | 0.77% | 0.77% | 0.77% |
| ENTGENTEGRIS INC | 0.75% | 0.75% | 0.75% |
| NVENT ELECTRIC PLC | 0.75% | 0.75% | 0.75% |
| ATIATI INC | 0.74% | 0.74% | 0.74% |
| FTITECHNIPFMC PLC | 0.73% | 0.73% | 0.73% |
| ILMNILLUMINA INC | 0.73% | 0.73% | 0.73% |
| STRLSTERLING INFRASTRUCTURE INC | 0.71% | 0.71% | 0.71% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in IJH
Nothing among its reported positions that the others do not also hold.
Only in MDY
Nothing among its reported positions that the others do not also hold.
Questions people ask
Is IJH the same as MDY?
99.5% of their weight sits in the same 400 holdings. Among its reported positions, IJH holds nothing the other does not also hold. Among its reported positions, MDY holds nothing the other does not also hold.
How is the overlap between IJH and MDY measured?
For every stock both funds report, the smaller of the two weights counts, and the sum is the overlap. The reported positions cover 100% of IJH and 99% of MDY, so the number cannot exceed the smaller coverage.
Which holds more, MDY or IJH?
IJH reports 400 stock positions and MDY reports 400. 0.0% of IJH's weight sits in names MDY does not hold, and 0.0% of MDY's weight in names IJH does not hold. The ten largest positions are 7.7% of IJH and 7.7% of MDY.
How do IJH and MDY differ by sector?
No sector differs by more than a point between the two. Sectors come from each holding's SIC code in its SEC record, summed by the weight the fund reports.
Where do the numbers come from?
From each fund's own N-PORT filing to the SEC, which lists every position and its weight. The comparison uses every equity position the fund reports; cash, futures and bonds are not counted, which is why a coverage figure sits next to every result. Holdings change between filings.
Other pairs with these funds
IJH against other funds in the table
MDY against other funds in the table
Add a third fund in the tool·All fund pairs
Descriptive data from public SEC filings. Nothing on this page is a recommendation to buy, sell or hold any fund or stock, and holdings change between filings.