IYM vs XLB overlap - what they share and where they differ
IYM and XLB share 53.1% of their weight across 14 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.
IYM and XLB
53.1%
14 shared positions
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
XLB
State Street(R) Materials Select Sector SPDR(R) ETF
Reported positions cover 100% of the fund, 26 positions · Jun 30, 2026
Top 10: 58.4%·Holdings of XLB
Reported positions cover IYM 100%, XLB 100% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
XLB vs IYM side by side
IYMiShares U.S. Basic Materials ETF
39
stock positions reported to the SEC
31.2% of its weight is in 25 names XLB does not hold
XLBState Street(R) Materials Select Sector SPDR(R) ETF
26
stock positions reported to the SEC
43.5% of its weight is in 12 names IYM does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Industrials: IYM has 2.7 points more of it.
The figures side by side
| IYM | XLB | |
|---|---|---|
| Filing date | Jul 31, 2026 | Jun 30, 2026 |
| Stock positions reported | 39 | 26 |
| Weight of the ten largest | 67.5% | 58.4% |
| Largest position | LIN 20.4% | LIN 14.1% |
| Held alone | 25 positions, 31.2% | 12 positions, 43.5% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In IYM | In XLB | Counted |
|---|---|---|---|
| LINLINDE PUBLIC LIMITED COMPANY | 20.35% | 14.06% | 14.06% |
| NEMNEWMONT CORPORATION | 9.28% | 5.84% | 5.84% |
| FCXFREEPORT-MCMORAN INC. | 8.33% | 5.30% | 5.30% |
| ECLECOLAB INC. | 6.44% | 4.73% | 4.73% |
| APDAIR PRODUCTS AND CHEMICALS, INC. | 5.01% | 4.62% | 4.62% |
| NUENUCOR CORPORATION | 4.53% | 3.88% | 3.88% |
| STLDSTEEL DYNAMICS, INC. | 3.13% | 3.73% | 3.13% |
| IPINTERNATIONAL PAPER COMPANY | 2.23% | 2.70% | 2.23% |
| IFFINTERNATIONAL FLAVORS & FRAGRANCES INC. | 2.11% | 2.71% | 2.11% |
| CFCF INDUSTRIES HOLDINGS, INC. | 2.00% | 2.23% | 2.00% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in IYM
Only in XLB
Questions people ask
Is IYM the same as XLB?
53.1% of their weight sits in the same 14 holdings. IYM also reports FAST, AU, CRS, which the other does not. XLB also reports CTVA, SHW, VMC, which the other does not.
How is the overlap between IYM and XLB 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 IYM and 100% of XLB, so the number cannot exceed the smaller coverage.
Which holds more, XLB or IYM?
IYM reports 39 stock positions and XLB reports 26. 31.2% of IYM's weight sits in names XLB does not hold, and 43.5% of XLB's weight in names IYM does not hold. The ten largest positions are 67.5% of IYM and 58.4% of XLB.
How do IYM and XLB differ by sector?
The widest gap is Industrials: IYM has 2.7 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.
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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.