MMID vs SPY
MFS Active Mid Cap ETF vs State Street SPDR S&P 500 ETF Trust
Which is better, MMID or SPY?
Mid Cap Blend against Large Cap Blend.
SPY has a lower expense ratio. SPY led over 1Y and the full window. MMID is less concentrated, with 16.2% of the fund in its ten largest positions against 38.2%.
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 | MMID | SPY |
|---|---|---|
| Expense Ratio | 0.59% | 0.09%Best |
| AUM | $36M | $823.2B |
| Dividend Yield | 0.99% | 0.99% |
| Holdings | 106 | 1,515 |
| YTD Return | +5.51% | +13.53%Best |
| 1Y Return | +6.40% | +17.47%Best |
| 3Y Return (annualized) | - | +22.36% |
| 5Y Return (annualized) | - | +13.21% |
| Volatility (annualized) | 10.5%Best | 12.6% |
| Max Drawdown | -7.9%Best | -8.9% |
| $10,000 over 1.1 years | $10,724 | $11,851Best |
| Top 10 Weight | 16.2%Best | 38.2% |
| Fund Family | MFS Investment Management | State Street Investment Management |
| Category | Equity | Equity |
| Style | Mid Cap Blend | Large Cap Blend |
| Inception | Sep 24, 2025 | Jan 22, 1993 |
Volatility and max drawdown, and the $10,000 over 1.1 years row, are measured over the window both funds cover: Sep 24, 2025 to Oct 14, 2026 (1.1 years).
MMID vs SPY 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 1.1 years both funds cover.
MMID vs SPY Performance
MFS Active Mid Cap ETF (MMID) is an ETF from MFS Investment Management and State Street SPDR S&P 500 ETF Trust (SPY) is an ETF from State Street Investment Management. Over the past year MMID returned +6.40% while SPY returned +17.47%. Year to date, MMID is up 5.51% versus a gain of 13.53% for SPY.
Past performance does not guarantee future results.
Risk: Volatility and Drawdowns
SPY has been the more volatile fund, with annualized monthly volatility of 12.6% compared with 10.5% for MMID. 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 -7.9% for MMID and -8.9% for SPY. Drawdown depth is what each fund did in the worst stretch of the window measured above.
The two funds' monthly returns correlate at 0.48. They move together some of the time, and apart the rest.
Fees and Cost Over Time
MMID charges 0.59% per year while SPY charges 0.09%. On a $10,000 position that is $59 vs $9 annually, a gap of $50 per year that compounds over a long holding period. On income, MMID currently yields 0.99% against 0.99% for SPY.
Holdings Overlap
58.6% of MMID's money is in holdings SPY also owns. 2.9% of SPY's money is in holdings MMID also owns.
The two portfolios partly overlap.
58 positions in common, counted across the 104 positions we hold weights for in MMID and 504 in SPY, against full books of 106 and 1,515.
What only one of them owns
Our book lists 439 positions for SPY that do not appear in our book for MMID (96.3% of the fund), and 38 for MMID that do not appear in SPY (33.5%).
Some of those will be the same company recorded under a different code in one of the two books, so the real difference in what you would own is no larger than this and may be smaller. We do not name the individual positions here for that reason.
Top Shared Holdings
| Stock | Weight in MMID | Weight in SPY | Difference |
|---|---|---|---|
| GPNGlobalpayments Inc. | 1.86% | 0.03% | 1.83% |
| WATWaters Corp. | 1.78% | 0.06% | 1.72% |
| VLOValero Energy | 1.59% | 0.17% | 1.42% |
| AAgilent Technologies Inc | 1.69% | 0.06% | 1.63% |
| BDXBecton Dickinson And Co. | 1.64% | 0.08% | 1.56% |
| FANGDiamondback Energy Inc - Common | 1.61% | 0.06% | 1.55% |
| WABWestinghouse Air Brake Technologies Corp. | 1.48% | 0.07% | 1.41% |
| GWWWw Grainger Inc. | 1.45% | 0.08% | 1.37% |
| HPEHewlett Packard Enterprise Co | 1.36% | 0.11% | 1.25% |
| STESteris Plc | 1.35% | 0.03% | 1.32% |
58.6% of MMID is already inside SPY.
You probably hold more than these two. Add the rest and see how much of the whole book is the same companies twice.
Free for up to 10 holdings. No account needed.
Frequently Asked Questions
Which is cheaper, MMID or SPY?
MMID has an expense ratio of 0.59% while SPY charges 0.09%. SPY is the cheaper option, by $50 a year on a $10,000 investment.
Which performed better, MMID or SPY?
Over the past year MMID returned +6.40% vs +17.47% for SPY, so SPY leads on 1-year performance. Over the longest common window we track (1 years), MMID annualized +6.56% vs +16.69% for SPY. Past performance does not guarantee future results. This is information, not a recommendation.
Which is riskier, MMID or SPY?
SPY has been the more volatile fund at 12.6% annualized versus 10.5% for MMID. Worst drawdown: MMID -7.9% vs SPY -8.9%.
Should I hold both MMID and SPY?
MMID and SPY have a monthly-return correlation of 0.48, so their returns are far enough apart for the mix to behave differently from either one alone. This is information, not a recommendation.
What is the holdings overlap between MMID and SPY?
58.6% of MMID's money is in holdings SPY also owns. 2.9% of SPY's is in holdings MMID also owns. They hold 58 positions in common, counted across the 104 positions we hold weights for in MMID and 504 in SPY.
Which pays a higher dividend, MMID or SPY?
MMID yields 0.99% while SPY yields 0.99%, so SPY currently pays the higher dividend yield.
Is SPY better than MMID?
SPY has a lower expense ratio. SPY led over 1Y and the full window. MMID is less concentrated, with 16.2% of the fund in its ten largest positions against 38.2%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.