VBK vs XBI overlap - what they share and where they differ
VBK and XBI share 10.3% of their weight across 43 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.
VBK and XBI
10.3%
43 shared positions
VBK
VANGUARD SMALL-CAP GROWTH INDEX FUND
Reported positions cover 100% of the fund, 536 positions · Jun 30, 2026
Top 10: 9.3%·Holdings of VBK
XBI
State Street(R) SPDR(R) S&P(R) Biotech ETF
Reported positions cover 100% of the fund, 149 positions · Jun 30, 2026
Top 10: 13.3%·Holdings of XBI
Reported positions cover VBK 100%, XBI 100% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
XBI vs VBK side by side
VBKVANGUARD SMALL-CAP GROWTH INDEX FUND
536
stock positions reported to the SEC
89.5% of its weight is in 493 names XBI does not hold
XBIState Street(R) SPDR(R) S&P(R) Biotech ETF
149
stock positions reported to the SEC
56.6% of its weight is in 106 names VBK does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Healthcare: XBI has 77.0 points more of it.
The figures side by side
| VBK | XBI | |
|---|---|---|
| Filing date | Jun 30, 2026 | Jun 30, 2026 |
| Stock positions reported | 536 | 149 |
| Weight of the ten largest | 9.3% | 13.3% |
| Largest position | CRDO 1.3% | APGE 1.5% |
| Held alone | 493 positions, 89.5% | 106 positions, 56.6% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In VBK | In XBI | Counted |
|---|---|---|---|
| RVMDREVOLUTION Medicines Inc | 1.06% | 1.20% | 1.06% |
| NTRANatera Inc | 1.04% | 1.16% | 1.04% |
| INCYIncyte Corp | 0.54% | 1.00% | 0.54% |
| ROIVRoivant Sciences Ltd | 0.50% | 1.16% | 0.50% |
| NBIXNeurocrine Biosciences Inc | 0.48% | 0.97% | 0.48% |
| BBIOBridgebio Pharma Inc | 0.37% | 1.02% | 0.37% |
| EXELExelixis Inc | 0.37% | 0.96% | 0.37% |
| IONSIonis Pharmaceuticals Inc | 0.35% | 1.00% | 0.35% |
| CYTKCytokinetics Inc | 0.32% | 1.18% | 0.32% |
| INSMInsmed Inc | 0.32% | 1.08% | 0.32% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in VBK
Only in XBI
Questions people ask
Is VBK the same as XBI?
10.3% of their weight sits in the same 43 holdings. VBK also reports CRDO, ALAB, TWLO, which the other does not. XBI also reports APGE, MRNA, ORKA, which the other does not.
How is the overlap between VBK and XBI 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 VBK and 100% of XBI, so the number cannot exceed the smaller coverage.
Which holds more, XBI or VBK?
VBK reports 536 stock positions and XBI reports 149. 89.5% of VBK's weight sits in names XBI does not hold, and 56.6% of XBI's weight in names VBK does not hold. The ten largest positions are 9.3% of VBK and 13.3% of XBI.
How do VBK and XBI differ by sector?
The widest gap is Healthcare: XBI has 77.0 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.
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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.