IWS vs VB overlap - what they share and where they differ
IWS and VB share 44.6% of their weight across 513 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.
IWS and VB
44.6%
513 shared positions
IWS
iShares Russell Mid-Cap Value ETF
Reported positions cover 100% of the fund, 709 positions · Jun 30, 2026
Top 10: 5.9%·Holdings of IWS
VB
VANGUARD SMALL-CAP INDEX FUND
Reported positions cover 100% of the fund, 1,294 positions · Jun 30, 2026
Top 10: 4.3%·Holdings of VB
Reported positions cover IWS 100%, VB 100% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
VB vs IWS side by side
IWSiShares Russell Mid-Cap Value ETF
709
stock positions reported to the SEC
53.4% of its weight is in 196 names VB does not hold
VBVANGUARD SMALL-CAP INDEX FUND
1,294
stock positions reported to the SEC
39.4% of its weight is in 781 names IWS does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Technology: VB has 4.5 points more of it.
The figures side by side
| IWS | VB | |
|---|---|---|
| Filing date | Jun 30, 2026 | Jun 30, 2026 |
| Stock positions reported | 709 | 1,294 |
| Weight of the ten largest | 5.9% | 4.3% |
| Largest position | WARNER BROS DISCOVERY INC 0.6% | CRDO 0.6% |
| Held alone | 196 positions, 53.4% | 781 positions, 39.4% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In IWS | In VB | Counted |
|---|---|---|---|
| FLEXFLEX LTD | 0.58% | 0.36% | 0.36% |
| ATOATMOS ENERGY CORP | 0.28% | 0.35% | 0.28% |
| MKSIMKS INC | 0.27% | 0.37% | 0.27% |
| ILMNILLUMINA INC | 0.26% | 0.31% | 0.26% |
| MRNAMODERNA INC | 0.25% | 0.30% | 0.25% |
| TWLOTWILIO INC | 0.25% | 0.38% | 0.25% |
| SWSMURFIT WESTROCK PLC | 0.24% | 0.29% | 0.24% |
| ENTGENTEGRIS INC | 0.23% | 0.33% | 0.23% |
| FFIVF5 INC | 0.23% | 0.29% | 0.23% |
| WILLIAMS-SONOMA INCWILLIAMS SONOMA INC | 0.23% | 0.33% | 0.23% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in IWS
Only in VB
Questions people ask
Is IWS the same as VB?
44.6% of their weight sits in the same 513 holdings. IWS also reports WARNER BROS DISCOVERY INC, DLR, PSX, which the other does not. VB also reports CRDO, JBL, RVMD, which the other does not.
How is the overlap between IWS and VB 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 IWS and 100% of VB, so the number cannot exceed the smaller coverage.
Which holds more, VB or IWS?
IWS reports 709 stock positions and VB reports 1,294. 53.4% of IWS's weight sits in names VB does not hold, and 39.4% of VB's weight in names IWS does not hold. The ten largest positions are 5.9% of IWS and 4.3% of VB.
How do IWS and VB differ by sector?
The widest gap is Technology: VB has 4.5 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.