- Issuer
- State Street
- Inception Date
- Feb 10, 2026
- Category
- Money Market
- Leveraged
- 1x (No leverage)
- Index Tracked
- No Index (Active)
- Distribution Policy
- Distributing
- Asset Class
- Bond
Share Price Chart
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Performance
MMK Performance Chart
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Returns By Period
State Street Prime Money Market ETF
- 1D
- 0.03%
- 1M
- 0.31%
- 6M
- —
- YTD
- —
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
Benchmark (S&P 500 Index)
- 1D
- 0.00%
- 1M
- -0.93%
- 6M
- 9.11%
- YTD
- 9.32%
- 1Y
- 19.17%
- 3Y*
- 18.87%
- 5Y*
- 11.45%
- 10Y*
- 13.53%
MMK Monthly Returns History
Based on dividend-adjusted daily data since Feb 12, 2026, MMK's average daily return is +0.01%, while the average monthly return is +0.23%. At this rate, an investment would double in approximately 25.1 years.
Historically, 100% of months were positive and 0% were negative. The best month was May 2026 with a return of +0.3%, while the worst month was Jul 2026 at 0.1%. The longest winning streak lasted 6 consecutive months, and the longest losing streak was 0 months.
On a daily basis, MMK closed higher 89% of trading days. The best single day was Apr 2, 2026 with a return of +0.1%, while the worst single day was Jun 1, 2026 at -0.0%.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0.16% | 0.28% | 0.31% | 0.33% | 0.27% | 0.05% | 1.41% |
Benchmark Metrics
State Street Prime Money Market ETF has an annualized alpha of 3.71%, beta of -0.00, and R2 of 0.00 versus S&P 500 Index. Calculated based on daily prices since February 12, 2026.
- This ETF captured 2.67% of S&P 500 Index gains and tended to rise during its downturns (downside capture of -11.58%) - a profile typical of hedging or uncorrelated assets.
- Beta of -0.00 may look defensive, but with R2 of 0.00 this ETF is largely uncorrelated with S&P 500 Index - low beta reflects independence, not downside protection. See the Volatility section for a true picture of this ETF's risk.
- R2 of 0.00 means this ETF moves largely independently of S&P 500 Index - capture ratios reflect limited market correlation rather than active downside protection. Consider using a more representative benchmark.
- Alpha
- 3.71%
- Beta
- -0.00
- R²
- 0.00
- Upside Capture
- 2.67%
- Downside Capture
- -11.58%
Expense Ratio
MMK has an expense ratio of 0.18%, which is considered low.
Return for Risk
Return / Risk — by metrics
The table below present risk-adjusted performance metrics for State Street Prime Money Market ETF (MMK) and compare them to S&P 500 Index.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| MMK | Benchmark | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | — | — | |
| Sortino ratioReturn per unit of downside risk | — | — | |
| Omega ratioGain probability vs. loss probability | — | 1.29 | — |
| Calmar ratioReturn relative to maximum drawdown | — | 2.23 | — |
| Martin ratioReturn relative to average drawdown | — | 9.69 | — |
Dividends
Dividend History
State Street Prime Money Market ETF provided a 1.38% dividend yield over the last twelve months, with an annual payout of $1.38 per share.
| Period | TTM |
|---|---|
| Dividend | $1.38 |
Dividend yield | 1.38% |
Monthly Dividends
The table displays the monthly dividend distributions for State Street Prime Money Market ETF. The dividends shown in the table have been adjusted to account for any splits that may have occurred.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | $0.18 | $0.31 | $0.30 | $0.31 | $0.29 | $1.38 |
Drawdowns
Drawdowns Chart
The Drawdowns chart displays portfolio losses from any high point along the way. Drawdowns are calculated considering price movements and all distributions paid, if any.
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Worst Drawdowns
The table below displays the maximum drawdowns of the State Street Prime Money Market ETF. A maximum drawdown is a measure of risk, indicating the largest reduction in portfolio value due to a series of losing trades.
The maximum drawdown for the State Street Prime Money Market ETF was 0.01%, occurring on Jun 1, 2026. Recovery took 1 trading session.
Related event | Drawdown | Fall | Recovery | Underwater |
|---|---|---|---|---|
2026 pullback2026 | -0.01%Jun 2026 | 0s | 1d | 1dJun 2026 - Jun 2026 |
2026 pullback2026 | -0.00%Apr 2026 | 0s | 1d | 1dApr 2026 - Apr 2026 |
2026 pullback2026 | -0.00%Jun 2026 | 0s | 1d | 1dJun 2026 - Jun 2026 |
2026 pullback2026 | -0.00%Feb 2026 | 0s | 1d | 1dFeb 2026 - Feb 2026 |
Drawdown Indicators
| MMK | Benchmark | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -0.01% | -56.78% | +56.77% |
Max Drawdown (1Y)Largest decline over 1 year | — | -9.10% | — |
Max Drawdown (3Y)Largest decline over 3 years | — | -18.90% | — |
Max Drawdown (5Y)Largest decline over 5 years | — | -25.43% | — |
Max Drawdown (10Y)Largest decline over 10 years | — | -33.92% | — |
Current DrawdownCurrent decline from peak | 0.00% | -1.66% | +1.66% |
Average DrawdownAverage peak-to-trough decline | -0.00% | -10.71% | +10.71% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | — | 2.09% | — |
Volatility
Volatility Chart
The chart below shows the rolling one-month volatility.
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