IBB vs VBR: Holdings Overlap
iShares · 254 holdings · $9.3B · as of 2026-03-31
VBRVanguard Small-cap Value Index Fund
Vanguard · 838 holdings · $38.3B · as of 2026-03-31
How similar are IBB and VBR?
iShares Biotechnology ETF (IBB, by iShares) holds 254 positions; Vanguard Small-cap Value Index Fund (VBR, by Vanguard) holds 838. They have 17 holdings in common, and by portfolio weight the two funds are 2.4% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 2.4%Sum of the smaller weight of each shared holding
- Shared Holdings
- 17IBB holds 254 · VBR holds 838
- Weight in Shared Holdings
- IBB 10%·VBR 2%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 IBB
237 of 254 positions (90.3% of the fund) are not held by VBR. Showing the top 30 by weight.
Sector Breakdown
| Sector | IBB | VBR |
|---|---|---|
| Health Care | 91.0% | 8.4% |
| Industrials | 0.0% | 18.8% |
| Financials | 0.0% | 18.7% |
| Consumer Discretionary | 0.0% | 10.9% |
| Real Estate | 0.0% | 9.1% |
| Other Sectors | 0.0% | 33.4% |
| Unclassified | 8.9% | 0.5% |
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 (9% of IBB, 1% of VBR).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IBB | -0.3% | +17.3% | +51.0% | +16.4% | +3.1% | +7.4% | 0.21% |
| VBR | +3.1% | +19.2% | +28.7% | +15.4% | +10.0% | +10.8% | 1.73% |
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 IBB vs VBR →
Shared Holdings(17)
The top 10 shared positions account for 97% of the overlap, led by UTHR, MRNA and ILMN.
 UTHRUnited Therapeutics Corporation COM | 2.30% | 0.63% | 0.63% |
|---|---|---|---|
 MRNAModerna Inc COM | 1.68% | 0.44% | 0.44% |
 ILMNIllumina Inc COM | 1.68% | 0.43% | 0.43% |
 CRLCharles River Laboratories International, Inc. COM | 0.77% | 0.21% | 0.21% |
 COGTCogent Biosciences Inc. COM | 0.48% | 0.14% | 0.14% |
| Nuvalent, Inc., Class A | 0.45% | 0.14% | 0.14% |
 CGONCG Oncology Inc. COM | 0.32% | 0.11% | 0.11% |
 PRAXPraxis Precision Medicines Inc COM NEW | 0.77% | 0.11% | 0.11% |
 BRKRBruker Corporation COM | 0.34% | 0.09% | 0.09% |
 SMMTSummit Therapeutics Inc. COM | 0.19% | 0.05% | 0.05% |
 DYNDyne Therapeutics Inc. COM | 0.20% | 0.03% | 0.03% |
 IOVAIovance Biotherapeutics Inc COM | 0.11% | 0.02% | 0.02% |
 FTREFortrea Holdings Inc. COMMON STOCK | 0.08% | 0.01% | 0.01% |
| Day One Biopharmaceuticals Inc. COM | 0.15% | 0.01% | 0.01% |
| OPKO Health, Inc. COM | 0.04% | 0.00% | 0.00% |
 2200963DOmniAb Inc. USD0.0001 A (USD12.5 VESTING) | 0.00% | 0.00% | 0.00% |
 2200964DOmniAb Inc. USD0.0001 A (USD15 VESTING) | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
How much do IBB and VBR overlap?
IBB and VBR overlap by 2.4% of portfolio weight. They share 17 holdings (IBB holds 254 positions and VBR holds 838), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IBB and VBR?
The two portfolios are 2.4% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IBB and VBR?
The largest positions held by both funds are UTHR, MRNA, ILMN, CRL and COGT. Together the top 10 shared positions account for 97% of the total overlap.
What does IBB own that VBR doesn't?
237 positions (90.3% of IBB) are unique to IBB, led by GILD, AMGN and VRTX. In the other direction, 821 positions (97.4% of VBR) are unique to VBR.