IBB vs ONEQ: Holdings Overlap
iShares · 254 holdings · $9.3B · as of 2026-03-31
ONEQFidelity Nasdaq Composite Index ETF
Fidelity · 1022 holdings · $10.8B · as of 2026-05-31
Holdings snapshots are 61 days apart (IBB: 2026-03-31, ONEQ: 2026-05-31). 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 ONEQ?
iShares Biotechnology ETF (IBB, by iShares) holds 254 positions; Fidelity Nasdaq Composite Index ETF (ONEQ, by Fidelity) holds 1022. They have 146 holdings in common, and by portfolio weight the two funds are 3.1% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 3.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 146IBB holds 254 · ONEQ holds 1022
- Weight in Shared Holdings
- IBB 93%·ONEQ 3%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
108 of 254 positions (7.0% of the fund) are not held by ONEQ. Showing the top 30 by weight.
Sector Breakdown
| Sector | IBB | ONEQ |
|---|---|---|
| Health Care | 91.0% | 4.4% |
| Information Technology | 0.0% | 53.0% |
| Communication Services | 0.0% | 15.2% |
| Consumer Discretionary | 0.0% | 12.5% |
| Consumer Staples | 0.0% | 4.4% |
| Other Sectors | 0.0% | 8.4% |
| Unclassified | 8.9% | 1.6% |
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 (9% of IBB, 2% of ONEQ).
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% |
| ONEQ | +3.3% | +15.4% | +26.6% | +25.1% | +13.6% | +18.8% | 0.51% |
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 ONEQ →
Shared Holdings(146)
The top 10 shared positions account for 50% of the overlap, led by AMGN, GILD and VRTX.
 AMGNAmgen Inc. COM | 7.51% | 0.39% | 0.39% |
|---|---|---|---|
 GILDGilead Sciences Inc. COM | 7.75% | 0.36% | 0.36% |
 VRTXVertex Pharmaceuticals Incorporated COM | 7.44% | 0.25% | 0.25% |
 REGNRegeneron Pharmaceuticals, Inc. COM | 7.21% | 0.14% | 0.14% |
 ALNYAlnylam Pharmaceuticals Inc. COM | 3.99% | 0.09% | 0.09% |
 NTRANatera Inc. COM | 2.41% | 0.07% | 0.07% |
 RVMDRevolution Medicines Inc COM | 1.54% | 0.07% | 0.07% |
 BIIBBiogen Inc COM | 2.46% | 0.06% | 0.06% |
 ILMNIllumina Inc COM | 1.68% | 0.05% | 0.05% |
 UTHRUnited Therapeutics Corporation COM | 2.30% | 0.05% | 0.05% |
 ARGXargenx SE, ADR | 3.07% | 0.05% | 0.05% |
 INSMInsmed Inc COM PAR $.01 | 3.20% | 0.05% | 0.05% |
 ROIVRoivant Sciences Ltd SHS | 1.24% | 0.05% | 0.05% |
 MRNAModerna Inc COM | 1.68% | 0.04% | 0.04% |
 INCYIncyte Corporation. COM | 1.70% | 0.04% | 0.04% |
 NBIXNeurocrine Biosciences Inc COM | 1.18% | 0.03% | 0.03% |
 SMMTSummit Therapeutics Inc. COM | 0.19% | 0.03% | 0.03% |
 EXELExelixis, Inc. COM | 0.99% | 0.03% | 0.03% |
 MEDPMedpace Holdings Inc. COM | 1.00% | 0.03% | 0.03% |
 BBIOBridgebio Pharma Inc COM | 1.13% | 0.03% | 0.03% |
 AXSMAxsome Therapeutics Inc. COM | 0.66% | 0.03% | 0.03% |
 IONSIonis Pharmaceuticals, Inc. COM | 1.11% | 0.03% | 0.03% |
 BNTXBioNTech SE, ADR | 0.66% | 0.03% | 0.03% |
 MDGLMadrigal Pharmaceuticals Inc COM | 1.00% | 0.03% | 0.03% |
 ARWRArrowhead Pharmaceuticals Inc COM | 0.75% | 0.02% | 0.02% |
Frequently Asked Questions
How much do IBB and ONEQ overlap?
IBB and ONEQ overlap by 3.1% of portfolio weight. They share 146 holdings (IBB holds 254 positions and ONEQ holds 1022), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IBB and ONEQ?
The two portfolios are 3.1% 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 ONEQ?
The largest positions held by both funds are AMGN, GILD, VRTX, REGN and ALNY. Together the top 10 shared positions account for 50% of the total overlap.
What does IBB own that ONEQ doesn't?
108 positions (7.0% of IBB) are unique to IBB, led by Ascendis Pharma A/S, CRL and ACLX. In the other direction, 876 positions (96.4% of ONEQ) are unique to ONEQ.