SPY vs WEEK
State Street SPDR S&P 500 ETF Trust vs Roundhill Weekly T-Bill ETF
Quick Verdict
SPY has a lower expense ratio. SPY delivered stronger 1-year returns. SPY offers more diversification with 503 holdings.
Side-by-Side Comparison
| Metric | SPY | WEEK | Winner |
|---|---|---|---|
| Expense Ratio | 0.09% | 0.19% | |
| AUM | $789.1B | $184M | |
| Dividend Yield | 1.01% | 0.93% | |
| Holdings | 505 | 15 | |
| YTD Return | +13.79% | +0.93% | |
| 1Y Return | +23.66% | +2.50% | |
| 3Y Return (annualized) | +21.40% | - | |
| 5Y Return (annualized) | +13.37% | - | |
| Volatility (annualized) | 15.3% | 0.8% | |
| Max Drawdown | -56.5% | -0.1% | |
| Fund Family | State Street Investment Management | Roundhill Investments | |
| Category | Equity | Fixed Income | |
| Inception | Jan 22, 1993 | Mar 6, 2025 |
SPY vs WEEK Performance
State Street SPDR S&P 500 ETF Trust (SPY) is a ETF from State Street Investment Management and Roundhill Weekly T-Bill ETF (WEEK) is a ETF from Roundhill Investments. Over the past year SPY returned +23.66% while WEEK returned +2.50%. Year to date, SPY is up 13.79% versus a gain of 0.93% for WEEK.
Risk: Volatility and Drawdowns
SPY has been the more volatile fund, with annualized monthly volatility of 15.3% compared with 0.8% for WEEK. Lower volatility generally means a smoother ride, though it often comes with lower long-run returns.
The deepest peak-to-trough decline in our data was -56.5% for SPY and -0.1% for WEEK. Drawdown depth is worth weighing if you expect to sell during market stress rather than ride it out.
The two funds' monthly returns correlate at -0.06. They move independently enough that combining them can meaningfully diversify a portfolio.
Fees and Cost Over Time
SPY charges 0.09% per year while WEEK charges 0.19%. On a $10,000 position that is $9 vs $19 annually, a gap of $10 per year that compounds over a long holding period. On income, SPY currently yields 1.01% against 0.93% for WEEK.
Holdings Overlap
SPY and WEEK share 0 holdings out of 504 unique holdings combined, representing a 0.0% weight overlap.
Moderate overlap means holding both could provide meaningful diversification benefits.
Frequently Asked Questions
Which is cheaper, SPY or WEEK?
SPY has an expense ratio of 0.09% while WEEK charges 0.19%. SPY is the cheaper option. On a $10,000 investment, that is $10 per year of difference.
Which performed better, SPY or WEEK?
Over the past year SPY returned +23.66% vs +2.50% for WEEK, so SPY leads on 1-year performance. Over the longest common window we track (1 years), SPY annualized +8.85% vs +3.87% for WEEK. Past performance does not guarantee future results.
Which is riskier, SPY or WEEK?
SPY has been the more volatile fund at 15.3% annualized versus 0.8% for WEEK. Worst drawdown: SPY -56.5% vs WEEK -0.1%.
Should I hold both SPY and WEEK?
SPY and WEEK have a monthly-return correlation of -0.06, so combining them can provide real diversification depending on your allocation goals.
What is the holdings overlap between SPY and WEEK?
SPY and WEEK share 0 common holdings with a 0.0% weight overlap. Combined, they hold 504 unique securities.
Which pays a higher dividend, SPY or WEEK?
SPY yields 1.01% while WEEK yields 0.93%, so SPY currently pays the higher dividend yield.
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