IWM vs VB overlap - what they share and where they differ
IWM and VB share 25.2% of their weight across 674 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.
IWM and VB
25.2%
674 shared positions
IWM
iShares Russell 2000 ETF
Reported positions cover 100% of the fund, 1,966 positions · Jun 30, 2026
Top 10: 3.4%·Holdings of IWM
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 IWM 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 IWM side by side
IWMiShares Russell 2000 ETF
1,966
stock positions reported to the SEC
32.4% of its weight is in 1,292 names VB does not hold
VBVANGUARD SMALL-CAP INDEX FUND
1,294
stock positions reported to the SEC
74.5% of its weight is in 620 names IWM does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Healthcare: IWM has 5.9 points more of it.
The figures side by side
| IWM | VB | |
|---|---|---|
| Filing date | Jun 30, 2026 | Jun 30, 2026 |
| Stock positions reported | 1,966 | 1,294 |
| Weight of the ten largest | 3.4% | 4.3% |
| Largest position | MOG.A 0.4% | CRDO 0.6% |
| Held alone | 1,292 positions, 32.4% | 620 positions, 74.5% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In IWM | In VB | Counted |
|---|---|---|---|
| MOG.AMoog, Inc. | 0.38% | 0.15% | 0.15% |
| BTSGBrightSpring Health Services, Inc. | 0.35% | 0.14% | 0.14% |
| CYTKCytokinetics, Inc. | 0.35% | 0.14% | 0.14% |
| HUTHut 8 Corp. | 0.37% | 0.14% | 0.14% |
| VSATViasat, Inc. | 0.35% | 0.14% | 0.14% |
| AGXArgan, Inc. | 0.34% | 0.13% | 0.13% |
| KRYSKrystal Biotech, Inc. | 0.30% | 0.13% | 0.13% |
| MXLMaxLinear, Inc. | 0.34% | 0.13% | 0.13% |
| CIFRCipher Digital, Inc. | 0.26% | 0.12% | 0.12% |
| CTRECareTrust REIT, Inc. | 0.28% | 0.12% | 0.12% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in IWM
Only in VB
Questions people ask
Is IWM the same as VB?
25.2% of their weight sits in the same 674 holdings. IWM also reports JBTM, KLIC, GTX, which the other does not. VB also reports CRDO, JBL, RVMD, which the other does not.
How is the overlap between IWM 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 IWM and 100% of VB, so the number cannot exceed the smaller coverage.
Which holds more, VB or IWM?
IWM reports 1,966 stock positions and VB reports 1,294. 32.4% of IWM's weight sits in names VB does not hold, and 74.5% of VB's weight in names IWM does not hold. The ten largest positions are 3.4% of IWM and 4.3% of VB.
How do IWM and VB differ by sector?
The widest gap is Healthcare: IWM has 5.9 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.