IBB vs IYH: Holdings Overlap
iShares · 254 holdings · $9.3B · as of 2026-03-31
IYHiShares U.S. Healthcare ETF
iShares · 103 holdings · $3.7B · as of 2026-04-30
Holdings snapshots are 30 days apart (IBB: 2026-03-31, IYH: 2026-04-30). 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 IBB and IYH?
iShares Biotechnology ETF (IBB, by iShares) holds 254 positions; iShares U.S. Healthcare ETF (IYH, by iShares) holds 103. They have 30 holdings in common, and by portfolio weight the two funds are 16.0% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 16.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 30IBB holds 254 · IYH holds 103
- Weight in Shared Holdings
- IBB 62%·IYH 16%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
224 of 254 positions (37.8% of the fund) are not held by IYH. Showing the top 30 by weight.
Sector Breakdown
| Sector | IBB | IYH |
|---|---|---|
| Health Care | 91.0% | 99.8% |
| Other Sectors | 0.0% | 0.0% |
| Unclassified | 8.9% | 0.0% |
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, 0% of IYH).
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% |
| IYH | +0.6% | +8.1% | +30.4% | +8.9% | +5.3% | +9.8% | 1.14% |
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 IYH →
Shared Holdings(30)
The top 10 shared positions account for 80% of the overlap, led by AMGN, GILD and VRTX.
 AMGNAmgen Inc. COM | 7.51% | 3.41% | 3.41% |
|---|---|---|---|
 GILDGilead Sciences Inc. COM | 7.75% | 2.99% | 2.99% |
 VRTXVertex Pharmaceuticals Incorporated COM | 7.44% | 1.99% | 1.99% |
 REGNRegeneron Pharmaceuticals, Inc. COM | 7.21% | 1.32% | 1.32% |
 ALNYAlnylam Pharmaceuticals Inc. COM | 3.99% | 0.72% | 0.72% |
 INSMInsmed Inc COM PAR $.01 | 3.20% | 0.52% | 0.52% |
 BIIBBiogen Inc COM | 2.46% | 0.51% | 0.51% |
 NTRANatera Inc. COM | 2.41% | 0.50% | 0.50% |
 RVMDRevolution Medicines Inc COM | 1.54% | 0.47% | 0.47% |
 UTHRUnited Therapeutics Corporation COM | 2.30% | 0.44% | 0.44% |
 ILMNIllumina Inc COM | 1.68% | 0.36% | 0.36% |
 MRNAModerna Inc COM | 1.68% | 0.30% | 0.30% |
 INCYIncyte Corporation. COM | 1.70% | 0.28% | 0.28% |
 NBIXNeurocrine Biosciences Inc COM | 1.18% | 0.23% | 0.23% |
 ROIVRoivant Sciences Ltd SHS | 1.24% | 0.22% | 0.22% |
 IONSIonis Pharmaceuticals, Inc. COM | 1.11% | 0.22% | 0.22% |
 EXELExelixis, Inc. COM | 0.99% | 0.21% | 0.21% |
 BMRNBiomarin Pharmaceutical Inc. COM | 0.98% | 0.19% | 0.19% |
 MEDPMedpace Holdings Inc. COM | 1.00% | 0.17% | 0.17% |
 TECHBio-Techne Corp COM | 0.74% | 0.16% | 0.16% |
 CRLCharles River Laboratories International, Inc. COM | 0.77% | 0.15% | 0.15% |
 HALOHalozyme Therapeutics Inc COM | 0.69% | 0.14% | 0.14% |
 RGENRepligen Corporation COM | 0.58% | 0.11% | 0.11% |
 TEMTempus AI, Inc., Class A | 0.43% | 0.10% | 0.10% |
 1JKApellis Pharmaceuticals Inc COM | 0.39% | 0.08% | 0.08% |
Frequently Asked Questions
How much do IBB and IYH overlap?
IBB and IYH overlap by 16.0% of portfolio weight. They share 30 holdings (IBB holds 254 positions and IYH holds 103), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IBB and IYH?
The two portfolios are 16.0% 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 IBB and IYH?
The largest positions held by both funds are AMGN, GILD, VRTX, REGN and ALNY. Together the top 10 shared positions account for 80% of the total overlap.
What does IBB own that IYH doesn't?
224 positions (37.8% of IBB) are unique to IBB, led by ARGX, ONC and GMAB. In the other direction, 73 positions (83.8% of IYH) are unique to IYH.