IBB vs QQQ: Holdings Overlap
iShares · 254 holdings · $9.3B · as of 2026-03-31
QQQInvesco QQQ Trust, Series 1
Invesco · 101 holdings · $479.2B · as of 2026-03-31
How similar are IBB and QQQ?
iShares Biotechnology ETF (IBB, by iShares) holds 254 positions; Invesco QQQ Trust, Series 1 (QQQ, by Invesco) holds 101. They have 6 holdings in common, and by portfolio weight the two funds are 3.6% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 3.6%Sum of the smaller weight of each shared holding
- Shared Holdings
- 6IBB holds 254 · QQQ holds 101
- Weight in Shared Holdings
- IBB 37%·QQQ 4%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
248 of 254 positions (62.8% of the fund) are not held by QQQ. Showing the top 30 by weight.
Sector Breakdown
| Sector | IBB | QQQ |
|---|---|---|
| Health Care | 91.0% | 5.1% |
| Information Technology | 0.0% | 49.7% |
| Communication Services | 0.0% | 16.0% |
| Consumer Discretionary | 0.0% | 12.6% |
| Consumer Staples | 0.0% | 8.5% |
| Other Sectors | 0.0% | 8.0% |
| 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 QQQ).
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% |
| QQQ | +1.9% | +18.0% | +27.6% | +25.2% | +15.2% | +20.8% | 0.42% |
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 QQQ →
Shared Holdings(6)
The top 6 shared positions account for 100% of the overlap, led by AMGN, GILD and VRTX.
 AMGNAmgen, Inc. | 7.51% | 1.07% | 1.07% |
|---|---|---|---|
 GILDGilead Sciences, Inc. | 7.75% | 0.98% | 0.98% |
 VRTXVertex Pharmaceuticals, Inc. | 7.44% | 0.64% | 0.64% |
 REGNRegeneron Pharmaceuticals, Inc. | 7.21% | 0.45% | 0.45% |
 ALNYAlnylam Pharmaceuticals, Inc. | 3.99% | 0.25% | 0.25% |
 INSMInsmed, Inc. | 3.20% | 0.20% | 0.20% |
Frequently Asked Questions
How much do IBB and QQQ overlap?
IBB and QQQ overlap by 3.6% of portfolio weight. They share 6 holdings (IBB holds 254 positions and QQQ holds 101), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IBB and QQQ?
The two portfolios are 3.6% 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 QQQ?
The largest positions held by both funds are AMGN, GILD, VRTX, REGN and ALNY. Together the top 6 shared positions account for 100% of the total overlap.
What does IBB own that QQQ doesn't?
248 positions (62.8% of IBB) are unique to IBB, led by ARGX, BIIB and NTRA. In the other direction, 95 positions (96.3% of QQQ) are unique to QQQ.