IBB vs IWN: Holdings Overlap
iShares · 254 holdings · $9.3B · as of 2026-03-31
IWNiShares Russell 2000 Value ETF
iShares · 1406 holdings · $14.7B · as of 2026-03-31
How similar are IBB and IWN?
iShares Biotechnology ETF (IBB, by iShares) holds 254 positions; iShares Russell 2000 Value ETF (IWN, by iShares) holds 1406. They have 114 holdings in common, and by portfolio weight the two funds are 6.8% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 6.8%Sum of the smaller weight of each shared holding
- Shared Holdings
- 114IBB holds 254 · IWN holds 1406
- Weight in Shared Holdings
- IBB 13%·IWN 7%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
140 of 254 positions (86.9% of the fund) are not held by IWN. Showing the top 30 by weight.
Sector Breakdown
| Sector | IBB | IWN |
|---|---|---|
| Health Care | 91.0% | 10.0% |
| Financials | 0.0% | 22.4% |
| Industrials | 0.0% | 11.9% |
| Consumer Discretionary | 0.0% | 8.7% |
| Energy | 0.0% | 8.5% |
| Other Sectors | 0.0% | 31.1% |
| Unclassified | 8.9% | 7.1% |
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, 7% of IWN).
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% |
| IWN | +2.4% | +25.3% | +42.6% | +16.8% | +9.0% | +10.2% | 1.41% |
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 IWN →
Shared Holdings(114)
The top 10 shared positions account for 44% of the overlap, led by PRAX, PCVX and CYTK.
 PRAXPraxis Precision Medicines, Inc. | 0.77% | 0.53% | 0.53% |
|---|---|---|---|
 PCVXVaxcyte, Inc. | 0.75% | 0.50% | 0.50% |
 CYTKCytokinetics, Inc. | 0.73% | 0.48% | 0.48% |
 430Terns Pharmaceuticals, Inc. | 0.46% | 0.35% | 0.35% |
 1CGCRISPR Therapeutics AG | 0.39% | 0.30% | 0.30% |
 ERASErasca, Inc. | 0.28% | 0.21% | 0.21% |
 IDYAIdeaya Biosciences, Inc. | 0.25% | 0.19% | 0.19% |
 DNLIDenali Therapeutics, Inc. | 0.25% | 0.18% | 0.18% |
 TNGXTango Therapeutics, Inc. | 0.18% | 0.16% | 0.16% |
 AGIOAgios Pharmaceuticals, Inc. | 0.17% | 0.13% | 0.13% |
 ORKAOruka Therapeutics, Inc. | 0.18% | 0.13% | 0.13% |
 GRALGRAIL, Inc. | 0.17% | 0.13% | 0.13% |
 TXG10X Genomics, Inc., Class A | 0.22% | 0.12% | 0.12% |
 DYNDyne Therapeutics, Inc. | 0.20% | 0.11% | 0.11% |
| Day One Biopharmaceuticals, Inc. | 0.15% | 0.11% | 0.11% |
 NRIXNurix Therapeutics, Inc. | 0.14% | 0.11% | 0.11% |
 ALMSAlumis, Inc. | 0.14% | 0.10% | 0.10% |
 ALKSAlkermes plc | 0.53% | 0.10% | 0.10% |
 KODKodiak Sciences, Inc. | 0.20% | 0.10% | 0.10% |
 NTLAIntellia Therapeutics, Inc. | 0.13% | 0.10% | 0.10% |
 RLAYRelay Therapeutics, Inc. | 0.12% | 0.10% | 0.10% |
 DFTXDefinium Therapeutics, Inc. | 0.16% | 0.09% | 0.09% |
 IOVAIovance Biotherapeutics, Inc. | 0.11% | 0.08% | 0.08% |
 SYRESpyre Therapeutics, Inc. | 0.30% | 0.08% | 0.08% |
 OLMAOlema Pharmaceuticals, Inc. | 0.08% | 0.07% | 0.07% |
Frequently Asked Questions
How much do IBB and IWN overlap?
IBB and IWN overlap by 6.8% of portfolio weight. They share 114 holdings (IBB holds 254 positions and IWN holds 1406), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IBB and IWN?
The two portfolios are 6.8% 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 IWN?
The largest positions held by both funds are PRAX, PCVX, CYTK, 430 and 1CG. Together the top 10 shared positions account for 44% of the total overlap.
What does IBB own that IWN doesn't?
140 positions (86.9% of IBB) are unique to IBB, led by GILD, AMGN and VRTX. In the other direction, 1292 positions (92.8% of IWN) are unique to IWN.