IBB vs SPY: Complete Comparison
iShares Biotechnology ETF vs SPDR S&P 500 ETF Trust 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 SPY wins this comparison
Key Factors
โถAdditional Metrics (5)
Bottom line: SPY wins with better expense ratio and number of holdings and 5-year return. Consider SPY for your portfolio, but IBB is still a solid choice if you prefer its specific advantages.
Detailed Overlap Analysis
11 shared holdings representing 1.1% portfolio overlap
Top Shared Holdings
| # | Stock | IBB Weight | SPY Weight | Overlap |
|---|---|---|---|---|
| 1 | AMGN AMGN | 7.27% | 0.30% | 0.30% |
| 2 | GILD GILD | 6.99% | 0.26% | 0.26% |
| 3 | VRTX VRTX | 7.36% | 0.20% | 0.20% |
| 4 | REGN REGN | 6.07% | 0.13% | 0.13% |
| 5 | IQV IQV | 3.18% | 0.06% | 0.06% |
| 6 | BIIB BIIB | 2.23% | 0.04% | 0.04% |
| 7 | WAT WAT | 1.97% | 0.04% | 0.04% |
| 8 | INCY INCY | 1.58% | 0.03% | 0.03% |
| 9 | MRNA MRNA | 0.81% | 0.02% | 0.02% |
| 10 | TECH TECH | 0.78% | 0.02% | 0.02% |
Overlap by Sector
Showing top 5 sectors by overlap contribution
Top Holdings Only in IBB
Unique to IBB
| Symbol | Name | Weight |
|---|---|---|
| ALNY | ALNY | 4.56% |
| INSM | INSM | 3.43% |
| ARGX | ARGX | 3.28% |
| NTRA | NTRA | 2.67% |
| MTD | MTD | 2.39% |
Top Holdings Only in SPY
Unique to SPY
| Symbol | Name | Weight |
|---|---|---|
| NVDA | NVDA | 7.73% |
| AAPL | AAPL | 6.82% |
| MSFT | MSFT | 6.11% |
| AMZN | AMZN | 3.81% |
| GOOGL | GOOGL | 3.08% |
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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