WEEK vs. SPYM
WEEK (Roundhill Weekly T-Bill ETF) and SPYM (State Street SPDR Portfolio S&P 500 ETF) are both exchange-traded funds - WEEK is a Ultrashort Bond fund actively managed by Roundhill, while SPYM is a S&P 500 fund tracking the S&P 500 Index. WEEK is actively managed, while SPYM is passively managed. Over the past year, WEEK returned 3.81% vs 28.09% for SPYM. At a 0.02 correlation, their price movements are largely independent. WEEK charges 0.19%/yr vs 0.02%/yr for SPYM.
Performance
WEEK vs. SPYM - Performance Comparison
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Returns By Period
In the year-to-date period, WEEK achieves a 1.44% return, which is significantly lower than SPYM's 10.98% return.
WEEK
- 1D
- 0.02%
- 1M
- 0.28%
- YTD
- 1.44%
- 6M
- 1.74%
- 1Y
- 3.81%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
SPYM
- 1D
- -0.66%
- 1M
- 5.06%
- YTD
- 10.98%
- 6M
- 10.98%
- 1Y
- 28.09%
- 3Y*
- 22.46%
- 5Y*
- 13.91%
- 10Y*
- 15.62%
WEEK vs. SPYM - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
WEEK Roundhill Weekly T-Bill ETF | 1.44% | 3.37% |
SPYM State Street SPDR Portfolio S&P 500 ETF | 10.98% | 20.50% |
Correlation
The correlation between WEEK and SPYM is 0.01, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.01 |
Correlation (All Time) Calculated using the full available price history since Mar 7, 2025 | 0.02 |
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Return for Risk
WEEK vs. SPYM — Risk / Return Rank
WEEK
SPYM
WEEK vs. SPYM - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Roundhill Weekly T-Bill ETF (WEEK) and State Street SPDR Portfolio S&P 500 ETF (SPYM). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
| WEEK | SPYM | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +6.90 | ||
| Sortino ratioReturn per unit of downside risk | +15.88 | ||
| Omega ratioGain probability vs. loss probability | 4.65 | 1.44 | +3.22 |
| Calmar ratioReturn relative to maximum drawdown | 29.49 | 3.17 | +26.32 |
| Martin ratioReturn relative to average drawdown | 263.82 | 14.76 | +249.06 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| WEEK | SPYM | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 9.29 | 2.39 | +6.90 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | — | 0.83 | — |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | — | 0.87 | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 10.05 | 0.62 | +9.43 |
Drawdowns
WEEK vs. SPYM - Drawdown Comparison
The maximum WEEK drawdown since its inception was -0.13%, smaller than the maximum SPYM drawdown of -54.46%. Use the drawdown chart below to compare losses from any high point for WEEK and SPYM.
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Drawdown Indicators
| WEEK | SPYM | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -0.13% | -54.46% | +54.33% |
Max Drawdown (1Y)Largest decline over 1 year | -0.13% | -8.90% | +8.77% |
Max Drawdown (3Y)Largest decline over 3 years | — | -18.72% | — |
Max Drawdown (5Y)Largest decline over 5 years | — | -24.48% | — |
Max Drawdown (10Y)Largest decline over 10 years | — | -33.87% | — |
Current DrawdownCurrent decline from peak | 0.00% | -0.66% | +0.66% |
Average DrawdownAverage peak-to-trough decline | -0.01% | -7.15% | +7.14% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.01% | 1.91% | -1.90% |
Volatility
WEEK vs. SPYM - Volatility Comparison
The current volatility for Roundhill Weekly T-Bill ETF (WEEK) is 0.07%, while State Street SPDR Portfolio S&P 500 ETF (SPYM) has a volatility of 2.83%. This indicates that WEEK experiences smaller price fluctuations and is considered to be less risky than SPYM based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| WEEK | SPYM | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.07% | 2.83% | -2.76% |
Volatility (6M)Calculated over the trailing 6-month period | 0.25% | 8.90% | -8.65% |
Volatility (1Y)Calculated over the trailing 1-year period | 0.41% | 11.80% | -11.39% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 0.39% | 16.80% | -16.41% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 0.39% | 18.00% | -17.61% |
WEEK vs. SPYM - Expense Ratio Comparison
WEEK has a 0.19% expense ratio, which is higher than SPYM's 0.02% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
WEEK vs. SPYM - Dividend Comparison
WEEK's dividend yield for the trailing twelve months is around 3.72%, more than SPYM's 1.00% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SPYM State Street SPDR Portfolio S&P 500 ETF | 1.00% | 1.13% | 1.28% | 1.44% | 1.69% | 1.25% | 1.54% | 1.79% | 2.23% | 1.75% | 1.97% | 1.98% |
WEEK Roundhill Weekly T-Bill ETF | 3.72% | 3.27% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
WEEK and SPYM have a correlation of 0.01, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
SPYM has higher volatility (2.83%) compared to WEEK (0.07%). In terms of maximum drawdown, WEEK dropped -0.13% vs SPYM's -54.46%.
On 1-year performance, SPYM leads with 28.09% vs 3.81% for WEEK. On fees, SPYM is cheaper at 0.02% per year. On volatility, WEEK has been the lower-risk option at 0.07%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 1-year period, SPYM has performed better with a 28.09% return vs 3.81%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
SPYM is cheaper with a 0.02% expense ratio, compared with 0.19% for WEEK.
WEEK has the higher dividend yield at 3.72%, compared with 1.00% for SPYM.
WEEK is categorized as Ultrashort Bond, while SPYM is S&P 500. They also come from different issuers: Roundhill and State Street. Their fees differ too: 0.19% for WEEK and 0.02% for SPYM.
WEEK currently has the higher Sharpe Ratio (9.29 vs 2.39), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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