VXF vs XBI: Holdings Overlap
VXFVanguard Extended Market Index Fund
Vanguard · 3359 holdings · $32.2B · 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 (VXF: 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 VXF and XBI?
Vanguard Extended Market Index Fund (VXF, by Vanguard) holds 3359 positions; State Street® SPDR® S&P® Biotech ETF (XBI, by State Street (SPDR)) holds 149. They have 139 holdings in common, and by portfolio weight the two funds are 6.5% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 6.5%Sum of the smaller weight of each shared holding
- Shared Holdings
- 139VXF holds 3359 · XBI holds 149
- Weight in Shared Holdings
- VXF 7%·XBI 91%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 VXF
3220 of 3359 positions (93.2% of the fund) are not held by XBI. Showing the top 30 by weight.
Sector Breakdown
| Sector | VXF | XBI |
|---|---|---|
| Health Care | 13.3% | 95.5% |
| Industrials | 19.5% | 0.0% |
| Information Technology | 16.3% | 0.0% |
| Financials | 15.0% | 0.0% |
| Consumer Discretionary | 9.8% | 0.0% |
| Other Sectors | 23.6% | 0.0% |
| Unclassified | 2.4% | 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 (2% of VXF, 5% of XBI).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| VXF | +2.4% | +18.9% | +26.9% | +18.6% | +6.9% | +12.0% | 0.99% |
| 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 VXF vs XBI →
Shared Holdings(139)
The top 10 shared positions account for 44% of the overlap, led by ALNY, INSM and NTRA.
 ALNYAlnylam Pharmaceuticals Inc. COM | 0.60% | 0.72% | 0.60% |
|---|---|---|---|
 INSMInsmed Inc COM PAR $.01 | 0.48% | 1.39% | 0.48% |
 NTRANatera Inc. COM | 0.38% | 1.18% | 0.38% |
 UTHRUnited Therapeutics Corporation COM | 0.35% | 0.95% | 0.35% |
 RVMDRevolution Medicines Inc COM | 0.24% | 1.33% | 0.24% |
 NBIXNeurocrine Biosciences Inc COM | 0.18% | 0.96% | 0.18% |
 BBIOBridgebio Pharma Inc COM | 0.17% | 1.19% | 0.17% |
 ROIVRoivant Sciences Ltd SHS | 0.17% | 1.19% | 0.17% |
 IONSIonis Pharmaceuticals, Inc. COM | 0.17% | 0.72% | 0.17% |
 EXELExelixis, Inc. COM | 0.15% | 0.96% | 0.15% |
 BMRNBiomarin Pharmaceutical Inc. COM | 0.15% | 1.06% | 0.15% |
 MDGLMadrigal Pharmaceuticals Inc COM | 0.13% | 1.05% | 0.13% |
 ARWRArrowhead Pharmaceuticals Inc COM | 0.12% | 1.17% | 0.12% |
 PRAXPraxis Precision Medicines Inc COM NEW | 0.11% | 1.49% | 0.11% |
 CYTKCytokinetics Incorporated | 0.11% | 1.17% | 0.11% |
 HALOHalozyme Therapeutics Inc COM | 0.10% | 1.18% | 0.10% |
 PCVXVaxcyte Inc COM | 0.10% | 1.25% | 0.10% |
 KRYSKrystal Biotech Inc COM | 0.09% | 1.00% | 0.09% |
 PTGXProtagonist Therapeutics Inc COM | 0.08% | 1.34% | 0.08% |
 COGTCogent Biosciences Inc. COM | 0.08% | 1.29% | 0.08% |
 ALKSAlkermes PLC COM USD0.01 | 0.08% | 1.07% | 0.08% |
 PTCTPTC Therapeutics, Inc. COM | 0.07% | 0.93% | 0.07% |
 RYTMRhythm Pharmaceuticals Inc COM | 0.07% | 1.26% | 0.07% |
 KYMRKymera Therapeutics Inc COM | 0.07% | 1.31% | 0.07% |
 CGONCG Oncology Inc. COM | 0.06% | 1.32% | 0.06% |
Frequently Asked Questions
How much do VXF and XBI overlap?
VXF and XBI overlap by 6.5% of portfolio weight. They share 139 holdings (VXF holds 3359 positions and XBI holds 149), based on each fund's latest SEC-reported holdings.
Is it redundant to own both VXF and XBI?
The two portfolios are 6.5% 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 VXF and XBI?
The largest positions held by both funds are ALNY, INSM, NTRA, UTHR and RVMD. Together the top 10 shared positions account for 44% of the total overlap.
What does VXF own that XBI doesn't?
3220 positions (93.2% of VXF) are unique to VXF, led by MRVL, NET and LNG. In the other direction, 10 positions (9.4% of XBI) are unique to XBI.