RSP
Invesco S&P 500 Equal Weight ETF
RSP tracks the S&P 500 Equal Weight Index, giving each of the 500 S&P 500 companies an equal 0.2% weighting regardless of market capitalization. This approach provides superior diversification by preventing concentration in mega-cap stocks. Equal weighting naturally tilts toward smaller companies within the S&P 500, providing exposure to mid-cap growth potential while maintaining large-cap stability. The strategy offers built-in rebalancing benefits and tends to outperform during periods of broad market participation.
SPY
SPDR S&P 500 ETF Trust
SPY tracks the traditional S&P 500 Index with market capitalization weighting, where larger companies have proportionally larger weights. The top 10 holdings represent about 30% of the portfolio, led by mega-cap technology stocks. This approach provides pure exposure to the market's natural weighting, letting winners run and avoiding forced rebalancing. SPY offers unmatched liquidity and is the benchmark for S&P 500 performance, making it ideal for investors wanting market-like returns with maximum efficiency.
Key Metrics Comparison
| Metric | RSP (Equal Weight) | SPY (Market Cap) | Winner |
|---|---|---|---|
| Expense Ratio | 0.20% | 0.0945% | SPY (Lower cost) |
| Dividend Yield | 1.8% | 1.4% | RSP (+0.4%) |
| 10-Year Annual Return | 11.9% | 12.3% | SPY (+0.4%) |
| Top 10 Holdings Concentration | 2.0% | 30.2% | RSP (Better diversified) |
| Portfolio Turnover | 25% | 3% | SPY (Lower turnover) |
| Median Market Cap | $42B | $185B | RSP (Mid-cap exposure) |
| P/E Ratio | 18.5 | 22.8 | RSP (Better valuation) |
| Price/Book Ratio | 3.2 | 4.5 | RSP (Better valuation) |
| 10-Year Volatility | 16.8% | 15.2% | SPY (Lower volatility) |
| Maximum Drawdown (2022) | -24% | -25% | RSP (Better protection) |
Performance Comparison
RSP Performance Profile
Strong long-term performance with built-in diversification benefits. Equal weighting provides exposure to mid-cap growth within the S&P 500. Historically outperforms during broad market rallies and economic expansions. Higher dividend yield from equal exposure to dividend-paying companies. Built-in rebalancing provides systematic buy-low, sell-high discipline. Tends to outperform when small and mid-caps lead the market. More volatile than market-cap weighted but with better downside protection during corrections. Value tilt leads to better valuations and margin of safety.
SPY Performance Profile
Market-cap weighted returns reflecting natural market leadership. Lower volatility due to mega-cap stability and lower turnover. Historically strong performance driven by technology mega-caps. Lower dividend yield due to tech concentration. Pure benchmark exposure for market-like returns. Tends to outperform when mega-cap technology leads the market. Excellent liquidity and low trading costs. Lower expense ratio provides cost advantage. More tax-efficient due to lower turnover. The standard for S&P 500 benchmark investing.
Strategy Analysis
RSP: Equal Weight Strategy
Enhanced diversification approach:
- Each S&P 500 company gets equal 0.2% weight
- Systematic rebalancing quarterly
- Built-in buy-low, sell-high discipline
- Reduces mega-cap concentration risk
- Provides mid-cap growth exposure
- Value tilt from equal weighting
- Higher dividend yield potential
- More active than market-cap weighting
- Quarterly rebalancing creates turnover
SPY: Market Cap Weight Strategy
Traditional benchmark approach:
- Companies weighted by market capitalization
- Larger companies have larger weights
- Top-heavy concentration (30% in top 10)
- Letting winners run without forced selling
- Pure market exposure
- Lower turnover and trading costs
- Better tax efficiency
- Mega-cap technology focus
- Passive with minimal rebalancing
Weighting Strategy Analysis
Equal weight vs market cap weight creates fundamentally different portfolio characteristics and performance drivers.
RSP Portfolio Characteristics
Concentration: 2% in top 10 holdings
Median Market Cap: $42B (mid-cap)
Sector Balance: More evenly distributed
Valuations: Lower P/E (18.5) and P/B (3.2)
Dividend Focus: Higher yield (1.8%)
Rebalancing: Quarterly forced trades
SPY Portfolio Characteristics
Concentration: 30% in top 10 holdings
Median Market Cap: $185B (mega-cap)
Sector Balance: Tech-heavy (28%)
Valuations: Higher P/E (22.8) and P/B (4.5)
Dividend Focus: Lower yield (1.4%)
Rebalancing: Minimal, index-driven
Market Condition Performance
Broad Market Rallies: RSP tends to outperform
Mega-Cap Leadership: SPY tends to outperform
Market Corrections: RSP better downside
Interest Rate Changes: RSP less sensitive
Economic Expansions: RSP benefits more
Tech Sector Dominance: SPY benefits more
Diversification Analysis
RSP Diversification Profile
Superior diversification with equal weighting across all 500 companies. No single stock dominates the portfolio. Reduced sector concentration risk with more balanced sector exposure. Built-in exposure to mid-cap growth opportunities. Systematic rebalancing provides discipline and reduces emotional decisions. Lower correlation to mega-cap technology stocks. More representative of the broader US economy. Better risk-adjusted returns during normal market conditions.
SPY Diversification Profile
Concentrated exposure to market leaders with natural market weighting. High concentration in top holdings (30% in top 10). Sector concentration in technology (28% of portfolio). Letting winners run provides exposure to successful companies. Lower diversification but higher efficiency. More exposure to mega-cap innovation leaders. Reflects actual market capitalization distribution. Higher company-specific risk from top holdings.
Portfolio Characteristics
RSP Top Holdings (Equal Weight)
Note: Every company equal 0.2% weight, superior diversification, mid-cap tilt
SPY Top Holdings (Market Cap Weight)
Note: Market cap weighted, concentrated in mega-caps, tech-heavy
Risk & Volatility Analysis
RSP Risk Profile
Volatility: Higher (16.8% annual) due to mid-cap tilt
Downside Protection: Better during corrections
Concentration Risk: Very low (equal weighting)
Company-Specific Risk: Minimal (0.2% max weight)
Sector Risk: Better balanced across sectors
Liquidity Risk: Good but lower than SPY
Rebalancing Risk: Quarterly forced trades
Style Drift Risk: Consistent equal weight
SPY Risk Profile
Volatility: Lower (15.2% annual) due to mega-caps
Downside Protection: Good but concentrated
Concentration Risk: High (30% in top 10)
Company-Specific Risk: Moderate (7.2% Apple)
Sector Risk: High tech concentration
Liquidity Risk: Minimal (world's most liquid)
Rebalancing Risk: Minimal passive approach
Style Drift Risk: None (pure market cap)
Investor Use Cases & Scenarios
When RSP Excels
Diversification Seekers: Want maximum S&P 500 diversification
Mid-Cap Exposure: Want mid-cap growth within large-cap safety
Value Investors: Prefer better valuations (lower P/E)
Dividend Focus: Want higher dividend yield
Rebalancing Benefits: Appreciate systematic discipline
Broad Market Bulls: Believe in broad market participation
Risk Management: Want lower concentration risk
Sector Balance: Prefer balanced sector exposure
When SPY Excels
Benchmark Investors: Want pure S&P 500 benchmark
Cost-Conscious: Lower expense ratio (0.0945%)
Liquidity Needs: Need maximum liquidity
Tech Believers: Want mega-cap tech exposure
Passive Purists: Prefer pure passive approach
Tax Efficiency: Lower turnover for taxable accounts
Market Leaders: Want to ride winning companies
Efficiency Focus: Prefer market efficiency
Investment Recommendation
⚖️ Choose RSP If:
- You want maximum diversification within S&P 500
- You prefer better valuations (lower P/E, P/B)
- You want higher dividend yield (1.8% vs 1.4%)
- You believe in broad market participation
- You want mid-cap growth exposure
- You appreciate systematic rebalancing
- You're concerned about mega-cap concentration
- You want balanced sector exposure
📊 Choose SPY If:
- You want pure S&P 500 benchmark exposure
- Minimizing costs is critical (0.0945% expense)
- You need maximum liquidity for trading
- You believe mega-cap tech will continue leading
- You prefer pure passive with minimal turnover
- Tax efficiency is important (lower turnover)
- You want to let market winners run
- You're comfortable with concentration in top stocks
💡 Portfolio Construction Strategy
For most long-term investors: RSP offers better diversification and risk-adjusted returns. For benchmark-focused investors: SPY provides pure market exposure. For cost-sensitive investors: SPY's 0.0945% vs RSP's 0.20% provides cost advantage. For diversification seekers: RSP's equal weight eliminates concentration risk. For combined approach: Use SPY for core, supplement with RSP for diversification. For performance differences: SPY outperformed slightly (12.3% vs 11.9% 10-year). For risk management: RSP has better downside protection. For taxable accounts: SPY's lower turnover is more tax-efficient. For retirement accounts: RSP's rebalancing works well in tax-sheltered accounts.