SPY vs WEEK
State Street SPDR S&P 500 ETF Trust vs Roundhill Weekly T-Bill ETF
Which is better, SPY or WEEK?
SPY has been ahead.
SPY has a lower expense ratio. SPY led over 1Y and the full window.
MarketXLS is not an investment adviser. This comparison is generated automatically from market data and is for information only. A Best mark means the better reading on that one measure, not a recommendation to buy.
Side-by-Side Comparison
| Metric | SPY | WEEK |
|---|---|---|
| Expense Ratio | 0.09%Best | 0.19% |
| AUM | $804.7B | $183M |
| Dividend Yield | 0.98% | 3.63% |
| Holdings | 505 | 15 |
| YTD Return | +12.22%Best | +0.89% |
| 1Y Return | +16.97%Best | +2.01% |
| 3Y Return (annualized) | +21.16% | - |
| 5Y Return (annualized) | +13.00% | - |
| Volatility (annualized) | 12.0% | 0.8%Best |
| Max Drawdown | -13.7% | -0.2%Best |
| $10,000 over 1.5 years | $13,455Best | $10,537 |
| Fund Family | State Street Investment Management | Roundhill Investments |
| Category | Equity | Fixed Income |
| Style | Large Cap Blend | - |
| Inception | Jan 22, 1993 | Mar 6, 2025 |
Not shown on this pair: Top 10 Weight.
Volatility and max drawdown, and the $10,000 over 1.5 years row, are measured over the window both funds cover: Mar 6, 2025 to Sep 17, 2026 (1.5 years).
SPY vs WEEK growth
Month-end closes. Both lines start at 0% in the first month shown, so the gap between them is the difference in growth across that window. The full view covers the 1.5 years both funds cover.
SPY vs WEEK Performance
State Street SPDR S&P 500 ETF Trust (SPY) is an ETF from State Street Investment Management and Roundhill Weekly T-Bill ETF (WEEK) is an ETF from Roundhill Investments. Over the past year SPY returned +16.97% while WEEK returned +2.01%. Year to date, SPY is up 12.22% versus a gain of 0.89% for WEEK.
Past performance does not guarantee future results.
Risk: Volatility and Drawdowns
SPY has been the more volatile fund, with annualized monthly volatility of 12.0% 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 -13.7% for SPY and -0.2% for WEEK. Drawdown depth is what each fund did in the worst stretch of the window measured above.
The two funds' monthly returns correlate at 0.02. They move largely independently of each other.
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 0.98% against 3.63% for WEEK.
Holdings Overlap
We hold position weights for 504 holdings in SPY and 1 in WEEK, totalling 99.9% and 0.0% of the two funds. The two books name no position in common, so there is no overlap percentage to show.
0 positions in common, counted across the 504 positions we hold weights for in SPY and 1 in WEEK, against full books of 505 and 15.
You are not choosing between two funds in isolation.
Whichever of SPY and WEEK you pick has to sit alongside everything else you own. Add the rest and see what the combination actually holds.
Free for up to 10 holdings. No account needed.
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, by $10 a year on a $10,000 investment.
Which performed better, SPY or WEEK?
Over the past year SPY returned +16.97% vs +2.01% for WEEK, so SPY leads on 1-year performance. Over the longest common window we track (2 years), SPY annualized +21.88% vs +3.55% for WEEK. Past performance does not guarantee future results. This is information, not a recommendation.
Which is riskier, SPY or WEEK?
SPY has been the more volatile fund at 12.0% annualized versus 0.8% for WEEK. Worst drawdown: SPY -13.7% vs WEEK -0.2%.
Should I hold both SPY and WEEK?
SPY and WEEK have a monthly-return correlation of 0.02, so their returns are far enough apart for the mix to behave differently from either one alone. This is information, not a recommendation.
Which pays a higher dividend, SPY or WEEK?
SPY yields 0.98% while WEEK yields 3.63%, so WEEK currently pays the higher dividend yield.
Is WEEK better than SPY?
SPY has a lower expense ratio. SPY led over 1Y and the full window. Which one suits a particular account depends on what it is for. This is information, not a recommendation.