COPX vs IYM overlap - what they share and where they differ
COPX and IYM share 6.5% of their weight across 2 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.
COPX and IYM
6.5%
2 shared positions
COPX
Global X Copper Miners ETF
Reported positions cover 100% of the fund, 40 positions · Jul 31, 2026
Top 10: 50.3%·Holdings of COPX
IYM
iShares U.S. Basic Materials ETF
Reported positions cover 100% of the fund, 39 positions · Jul 31, 2026
Top 10: 67.5%·Holdings of IYM
Reported positions cover COPX 100%, IYM 100% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
IYM vs COPX side by side
COPXGlobal X Copper Miners ETF
40
stock positions reported to the SEC
90.0% of its weight is in 38 names IYM does not hold
IYMiShares U.S. Basic Materials ETF
39
stock positions reported to the SEC
89.8% of its weight is in 37 names COPX does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Basic Materials: IYM has 48.0 points more of it.
The figures side by side
| COPX | IYM | |
|---|---|---|
| Filing date | Jul 31, 2026 | Jul 31, 2026 |
| Stock positions reported | 40 | 39 |
| Weight of the ten largest | 50.3% | 67.5% |
| Largest position | BHP 5.5% | LIN 20.4% |
| Held alone | 38 positions, 90.0% | 37 positions, 89.8% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In COPX | In IYM | Counted |
|---|---|---|---|
| FCXFREEPORT-MCMORAN INC. | 4.76% | 8.33% | 4.76% |
| SCCOSOUTHERN COPPER CORPORATION | 5.08% | 1.75% | 1.75% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in COPX
Only in IYM
Questions people ask
Is COPX the same as IYM?
6.5% of their weight sits in the same 2 holdings. COPX also reports BHP, TECK, HBM, which the other does not. IYM also reports LIN, NEM, ECL, which the other does not.
How is the overlap between COPX and IYM 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 COPX and 100% of IYM, so the number cannot exceed the smaller coverage.
Which holds more, IYM or COPX?
COPX reports 40 stock positions and IYM reports 39. 90.0% of COPX's weight sits in names IYM does not hold, and 89.8% of IYM's weight in names COPX does not hold. The ten largest positions are 50.3% of COPX and 67.5% of IYM.
How do COPX and IYM differ by sector?
The widest gap is Basic Materials: IYM has 48.0 points more of it. 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.
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.