IBB vs IJR: Holdings Overlap
iShares · 254 holdings · $9.3B · as of 2026-03-31
IJRiShares Core S&P Small-Cap ETF
iShares · 605 holdings · $113.4B · as of 2026-03-31
How similar are IBB and IJR?
iShares Biotechnology ETF (IBB, by iShares) holds 254 positions; iShares Core S&P Small-Cap ETF (IJR, by iShares) holds 605. They have 17 holdings in common, and by portfolio weight the two funds are 2.9% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 2.9%Sum of the smaller weight of each shared holding
- Shared Holdings
- 17IBB holds 254 · IJR holds 605
- Weight in Shared Holdings
- IBB 4%·IJR 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
237 of 254 positions (95.7% of the fund) are not held by IJR. Showing the top 30 by weight.
Sector Breakdown
| Sector | IBB | IJR |
|---|---|---|
| Health Care | 91.0% | 11.1% |
| Financials | 0.0% | 17.4% |
| Industrials | 0.0% | 17.1% |
| Consumer Discretionary | 0.0% | 13.2% |
| Information Technology | 0.0% | 12.7% |
| Other Sectors | 0.0% | 26.0% |
| Unclassified | 8.9% | 0.9% |
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 IJR).
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% |
| IJR | +2.4% | +24.5% | +36.4% | +14.5% | +7.7% | +10.9% | 1.10% |
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 IJR →
Shared Holdings(17)
The top 10 shared positions account for 89% of the overlap, led by KRYS, PTGX and ALKS.
 KRYSKrystal Biotech Inc COM | 0.60% | 0.44% | 0.44% |
|---|---|---|---|
 PTGXProtagonist Therapeutics Inc COM | 0.58% | 0.40% | 0.40% |
 ALKSAlkermes PLC COM USD0.01 | 0.53% | 0.38% | 0.38% |
 PTCTPTC Therapeutics, Inc. COM | 0.50% | 0.36% | 0.36% |
 1JKApellis Pharmaceuticals Inc COM | 0.39% | 0.27% | 0.27% |
 ACADAcadia Pharmaceuticals Inc COM | 0.34% | 0.18% | 0.18% |
 VCYTVeracyte Inc COM | 0.23% | 0.17% | 0.17% |
 SRPTSarepta Therapeutics Inc COM | 0.20% | 0.15% | 0.15% |
 ADMAAdma Biologics Inc COM | 0.19% | 0.14% | 0.14% |
 RCUSArcus Biosciences Inc. COM | 0.16% | 0.12% | 0.12% |
 VCELVericel Corporation COM | 0.15% | 0.11% | 0.11% |
 VIRVIR Biotechnology Inc COM | 0.08% | 0.07% | 0.07% |
 FTREFortrea Holdings Inc. COMMON STOCK | 0.08% | 0.06% | 0.06% |
 XNCRXencor Inc COM | 0.08% | 0.06% | 0.06% |
| Cytek Biosciences Inc COM | 0.05% | 0.03% | 0.03% |
 2200964DOmniAb Inc. USD0.0001 A (USD15 VESTING) | 0.00% | 0.00% | 0.00% |
 2200963DOmniAb Inc. USD0.0001 A (USD12.5 VESTING) | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
How much do IBB and IJR overlap?
IBB and IJR overlap by 2.9% of portfolio weight. They share 17 holdings (IBB holds 254 positions and IJR holds 605), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IBB and IJR?
The two portfolios are 2.9% 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 IJR?
The largest positions held by both funds are KRYS, PTGX, ALKS, PTCT and 1JK. Together the top 10 shared positions account for 89% of the total overlap.
What does IBB own that IJR doesn't?
237 positions (95.7% of IBB) are unique to IBB, led by GILD, AMGN and VRTX. In the other direction, 588 positions (95.5% of IJR) are unique to IJR.