VBK vs XBI: Holdings Overlap
VBKVanguard Small-cap Growth Index Fund
Vanguard · 551 holdings · $24.3B · as of 2026-03-31
XBIState Street® SPDR® S&P® Biotech ETF
State Street (SPDR) · 149 holdings · $10.0B · as of 2026-08-06
Holdings snapshots are 128 days apart (VBK: 2026-03-31, XBI: 2026-08-06). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are VBK and XBI?
Vanguard Small-cap Growth Index Fund (VBK, by Vanguard) holds 551 positions; State Street® SPDR® S&P® Biotech ETF (XBI, by State Street (SPDR)) holds 149. They have 44 holdings in common, and by portfolio weight the two funds are 9.1% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 9.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 44VBK holds 551 · XBI holds 149
- Weight in Shared Holdings
- VBK 9%·XBI 41%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in VBK
507 of 551 positions (90.6% of the fund) are not held by XBI. Showing the top 30 by weight.
Only in XBI
105 of 149 positions (58.9% of the fund) are not held by VBK. Showing the top 30 by weight.
Sector Breakdown
| Sector | VBK | XBI |
|---|---|---|
| Health Care | 16.1% | 95.5% |
| Industrials | 24.6% | 0.0% |
| Information Technology | 21.6% | 0.0% |
| Consumer Discretionary | 9.9% | 0.0% |
| Financials | 6.1% | 0.0% |
| Other Sectors | 20.6% | 0.0% |
| Unclassified | 0.9% | 4.6% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts. “Unclassified” is weight we could not classify (1% of VBK, 5% of XBI).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| VBK | +1.8% | +19.6% | +29.4% | +16.6% | +5.3% | +11.4% | 0.42% |
| XBI | -4.0% | +29.2% | +85.3% | +26.3% | +4.5% | +9.5% | 0.36% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in VBK vs XBI →
Shared Holdings(44)
The top 10 shared positions account for 55% of the overlap, led by NTRA, RVMD and INSM.
 NTRANatera Inc. COM | 0.88% | 1.18% | 0.88% |
|---|---|---|---|
 RVMDRevolution Medicines Inc COM | 0.61% | 1.33% | 0.61% |
 INSMInsmed Inc COM PAR $.01 | 0.59% | 1.39% | 0.59% |
 INCYIncyte Corporation. COM | 0.53% | 1.09% | 0.53% |
 NBIXNeurocrine Biosciences Inc COM | 0.44% | 0.96% | 0.44% |
 BBIOBridgebio Pharma Inc COM | 0.43% | 1.19% | 0.43% |
 ROIVRoivant Sciences Ltd SHS | 0.43% | 1.19% | 0.43% |
 IONSIonis Pharmaceuticals, Inc. COM | 0.39% | 0.72% | 0.39% |
 BMRNBiomarin Pharmaceutical Inc. COM | 0.36% | 1.06% | 0.36% |
 EXELExelixis, Inc. COM | 0.35% | 0.96% | 0.35% |
 MDGLMadrigal Pharmaceuticals Inc COM | 0.32% | 1.05% | 0.32% |
 PCVXVaxcyte Inc COM | 0.28% | 1.25% | 0.28% |
 ARWRArrowhead Pharmaceuticals Inc COM | 0.28% | 1.17% | 0.28% |
 CYTKCytokinetics Incorporated | 0.27% | 1.17% | 0.27% |
 HALOHalozyme Therapeutics Inc COM | 0.25% | 1.18% | 0.25% |
 KRYSKrystal Biotech Inc COM | 0.23% | 1.00% | 0.23% |
 PTGXProtagonist Therapeutics Inc COM | 0.22% | 1.34% | 0.22% |
 RYTMRhythm Pharmaceuticals Inc COM | 0.20% | 1.26% | 0.20% |
 ALKSAlkermes PLC COM USD0.01 | 0.20% | 1.07% | 0.20% |
 PTCTPTC Therapeutics, Inc. COM | 0.19% | 0.93% | 0.19% |
 KYMRKymera Therapeutics Inc COM | 0.18% | 1.31% | 0.18% |
 TGTXTG Therapeutics Inc COM | 0.17% | 1.03% | 0.17% |
 VKTXViking Therapeutics Inc. COM | 0.12% | 1.16% | 0.12% |
 ACADAcadia Pharmaceuticals Inc COM | 0.09% | 1.10% | 0.09% |
 TWSTTwist Bioscience Corporation COM | 0.09% | 1.56% | 0.09% |
Frequently Asked Questions
How much do VBK and XBI overlap?
VBK and XBI overlap by 9.1% of portfolio weight. They share 44 holdings (VBK holds 551 positions and XBI holds 149), based on each fund's latest SEC-reported holdings.
Is it redundant to own both VBK and XBI?
The two portfolios are 9.1% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of VBK and XBI?
The largest positions held by both funds are NTRA, RVMD, INSM, INCY and NBIX. Together the top 10 shared positions account for 55% of the total overlap.
What does VBK own that XBI doesn't?
507 positions (90.6% of VBK) are unique to VBK, led by FTI, CIEN and CASY. In the other direction, 105 positions (58.9% of XBI) are unique to XBI.