XBI vs IWM: Complete Comparison
SPDR S&P Biotech ETF vs iShares Russell 2000 ETF โ overlap, correlation, performance & risk analysis
Visual Overlap
Price Performance
Historical price comparison over 3M
๐Performance Comparison
โ ๏ธRisk Metrics
Interpretation:
- ๐ Lower volatility = smoother ride
- โก Higher Sharpe/Sortino = better risk-adjusted returns
- โ ๏ธ Smaller max drawdown = less worst-case pain
- ๐ Beta > 1 = more volatile than S&P 500
โ๏ธHead-to-Head Comparison
๐ IWM wins this comparison
Key Factors
โถAdditional Metrics (5)
Bottom line: IWM wins with better expense ratio and number of holdings. Consider IWM for your portfolio, but XBI is still a solid choice if you prefer its specific advantages.
Detailed Overlap Analysis
91 shared holdings representing 4.9% portfolio overlap
Top Shared Holdings
| # | Stock | XBI Weight | IWM Weight | Overlap |
|---|---|---|---|---|
| 1 | BBIO BBIO | 1.26% | 0.38% | 0.38% |
| 2 | MDGL MDGL | 1.30% | 0.35% | 0.35% |
| 3 | CYTK CYTK | 1.27% | 0.25% | 0.25% |
| 4 | PTCT PTCT | 1.26% | 0.20% | 0.20% |
| 5 | KRYS KRYS | 1.25% | 0.20% | 0.20% |
| 6 | PCVX PCVX | 1.31% | 0.18% | 0.18% |
| 7 | RYTM RYTM | 1.28% | 0.18% | 0.18% |
| 8 | PRAX PRAX | 1.25% | 0.18% | 0.18% |
| 9 | VCYT VCYT | 0.75% | 0.12% | 0.12% |
| 10 | TVTX TVTX | 1.40% | 0.10% | 0.10% |
Overlap by Sector
Showing top 5 sectors by overlap contribution
Top Holdings Only in XBI
Unique to XBI
| Symbol | Name | Weight |
|---|---|---|
| EXEL | EXEL | 1.35% |
| MRNA | MRNA | 1.34% |
| BMRN | BMRN | 1.34% |
| ROIV | ROIV | 1.33% |
| HALO | HALO | 1.30% |
Top Holdings Only in IWM
Unique to IWM
| Symbol | Name | Weight |
|---|---|---|
| CRDO | CREDO TECHNOLOGY GROUP HOLDING LTD | 0.86% |
| BE | BLOOM ENERGY CLASS A CORP | 0.80% |
| FN | FABRINET | 0.62% |
| IONQ | IONQ INC | 0.51% |
| NXT | NEXTPOWER INC CLASS A | 0.44% |
Price Correlation
How We Calculate Overlap
We use the minimum weight method with normalization to calculate portfolio overlap:
Overlap = ฮฃ min(weightA, weightB) for each shared holdingNormalization: Holdings weights are normalized to sum to 100% before comparison. This ensures accurate overlap calculations even when analyzing partial holdings data (e.g., top 50 positions).
Conservative approach: We consider only the smaller allocation for each shared position, giving you a realistic view of true portfolio overlap.
๐ This analysis is based on publicly available holdings data. For the most current and complete holdings information, please visit the official ETF provider websites.
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