IBB vs IEFA: Holdings Overlap
iShares · 254 holdings · $9.3B · as of 2026-03-31
IEFAiShares Core MSCI EAFE ETF
iShares · 2632 holdings · $193.5B · as of 2026-04-30
Holdings snapshots are 30 days apart (IBB: 2026-03-31, IEFA: 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 IEFA?
iShares Biotechnology ETF (IBB, by iShares) holds 254 positions; iShares Core MSCI EAFE ETF (IEFA, by iShares) holds 2632. They have 1 holdings in common, and by portfolio weight the two funds are 0.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 1IBB holds 254 · IEFA holds 2632
- Weight in Shared Holdings
- IBB 0%·IEFA 0%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
253 of 254 positions (99.8% of the fund) are not held by IEFA. Showing the top 30 by weight.
Sector Breakdown
| Sector | IBB | IEFA |
|---|---|---|
| Health Care | 91.0% | 8.3% |
| Financials | 0.0% | 20.5% |
| Industrials | 0.0% | 16.0% |
| Information Technology | 0.0% | 7.9% |
| Consumer Staples | 0.0% | 5.9% |
| Other Sectors | 0.0% | 23.8% |
| Unclassified | 8.9% | 17.0% |
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, 17% of IEFA).
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% |
| IEFA | +4.2% | +14.8% | +24.5% | +17.9% | +9.3% | +9.8% | 3.25% |
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 IEFA →
Shared Holdings(1)
 PHVSPharvaris NV | 0.07% | 0.00% | 0.00% |
|---|
Frequently Asked Questions
How much do IBB and IEFA overlap?
IBB and IEFA overlap by 0.0% of portfolio weight. They share 1 holdings (IBB holds 254 positions and IEFA holds 2632), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IBB and IEFA?
The two portfolios are 0.0% 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 IEFA?
The largest positions held by both funds are PHVS. Together the top 1 shared positions account for 0% of the total overlap.
What does IBB own that IEFA doesn't?
253 positions (99.8% of IBB) are unique to IBB, led by GILD, AMGN and VRTX. In the other direction, 2631 positions (99.4% of IEFA) are unique to IEFA.