MMK vs SPY
State Street Prime Money Market ETF vs State Street SPDR S&P 500 ETF Trust
Quick Verdict
SPY has a lower expense ratio. SPY offers more diversification with 505 holdings.
Side-by-Side Comparison
| Metric | MMK | SPY | Winner |
|---|---|---|---|
| Expense Ratio | 0.18% | 0.09% | |
| AUM | $29M | $821.1B | |
| Dividend Yield | 1.37% | 1.01% | |
| Holdings | 0 | 505 | |
| YTD Return | +1.89% | +13.17% | |
| 1Y Return | - | +21.53% | |
| 3Y Return (annualized) | - | +22.06% | |
| 5Y Return (annualized) | - | +13.35% | |
| Volatility (annualized) | - | 15.3% | |
| Max Drawdown | -0.0% | -56.5% | |
| Fund Family | State Street Investment Management | State Street Investment Management | |
| Category | Money Market | Equity | |
| Inception | Feb 10, 2026 | Jan 22, 1993 |
MMK vs SPY Performance
State Street Prime Money Market ETF (MMK) is a ETF from State Street Investment Management and State Street SPDR S&P 500 ETF Trust (SPY) is a ETF from State Street Investment Management. Year to date, MMK is up 1.89% versus a gain of 13.17% for SPY.
Risk: Volatility and Drawdowns
The deepest peak-to-trough decline in our data was -0.0% for MMK and -56.5% for SPY. Drawdown depth is worth weighing if you expect to sell during market stress rather than ride it out.
Fees and Cost Over Time
MMK charges 0.18% per year while SPY charges 0.09%. On a $10,000 position that is $18 vs $9 annually, a gap of $9 per year that compounds over a long holding period. On income, MMK currently yields 1.37% against 1.01% for SPY.
Frequently Asked Questions
Which is cheaper, MMK or SPY?
MMK has an expense ratio of 0.18% while SPY charges 0.09%. SPY is the cheaper option. On a $10,000 investment, that is $9 per year of difference.
Which pays a higher dividend, MMK or SPY?
MMK yields 1.37% while SPY yields 1.01%, so MMK currently pays the higher dividend yield.
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