IVV vs MMID
iShares Core S&P 500 ETF vs MFS Active Mid Cap ETF
Which is better, IVV or MMID?
Large Cap Blend against Mid Cap Blend.
IVV has a lower expense ratio. IVV led over 1Y. MMID is less concentrated, with 15.2% of the fund in its ten largest positions against 37.9%.
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 | IVV | MMID |
|---|---|---|
| Expense Ratio | 0.03%Best | 0.59% |
| AUM | $876.4B | $36M |
| Dividend Yield | 1.06% | 0.68% |
| Holdings | 508 | 106 |
| YTD Return | +11.57%Best | +5.59% |
| 1Y Return | +17.57%Best | +7.01% |
| 3Y Return (annualized) | +20.71% | - |
| 5Y Return (annualized) | +12.80% | - |
| Volatility (annualized) | 13.4% | 9.9%Best |
| Top 10 Weight | 37.9% | 15.2%Best |
| Fund Family | iShares by BlackRock (US) | MFS Investment Management |
| Category | Equity | Equity |
| Style | Large Cap Blend | Mid Cap Blend |
| Inception | May 15, 2000 | Sep 24, 2025 |
Not shown on this pair: Max Drawdown, $10,000 over the window.
IVV vs MMID 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 is available from the range buttons; it is not the opening view here because over the whole period one of these two funds moves so much further than the other that its line would sit flat on the axis.
IVV vs MMID Performance
iShares Core S&P 500 ETF (IVV) is an ETF from iShares by BlackRock (US) and MFS Active Mid Cap ETF (MMID) is an ETF from MFS Investment Management. Over the past year IVV returned +17.57% while MMID returned +7.01%. Year to date, IVV is up 11.57% versus a gain of 5.59% for MMID.
Past performance does not guarantee future results.
Risk: Volatility and Drawdowns
IVV has been the more volatile fund, with annualized monthly volatility of 13.4% compared with 9.9% for MMID. Lower volatility generally means a smoother ride, though it often comes with lower long-run returns.
The two funds' monthly returns correlate at 0.54. They move together some of the time, and apart the rest.
Fees and Cost Over Time
IVV charges 0.03% per year while MMID charges 0.59%. On a $10,000 position that is $3 vs $59 annually, a gap of $56 per year that compounds over a long holding period. On income, IVV currently yields 1.06% against 0.68% for MMID.
Holdings Overlap
2.8% of IVV's money is in holdings MMID also owns. 56.5% of MMID's money is in holdings IVV also owns.
The two portfolios partly overlap.
55 positions in common, counted across the 505 positions we hold weights for in IVV and 106 in MMID, against full books of 508 and 106.
What only one of them owns
Our book lists 39 positions for MMID that do not appear in our book for IVV (35.3% of the fund), and 439 for IVV that do not appear in MMID (96.6%).
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 IVV | Weight in MMID | Difference |
|---|---|---|---|
| GPNGlobal Payments Inc. | 0.03% | 1.73% | 1.70% |
| FANGDiamondback Energy Inc. | 0.05% | 1.66% | 1.61% |
| GWWWw Grainger Inc. | 0.08% | 1.54% | 1.46% |
| WABWestinghouse Air Brake Technologies Corp. | 0.08% | 1.50% | 1.42% |
| WATWaters Corp. | 0.06% | 1.52% | 1.46% |
| BDXBecton Dickinson And Co. | 0.07% | 1.45% | 1.38% |
| STESteris Plc | 0.03% | 1.43% | 1.40% |
| MTBM&t Bank Corp. | 0.06% | 1.38% | 1.32% |
| AAgilent Tech In 3.2 10/22 | 0.06% | 1.36% | 1.30% |
| VLOValero Energy Corp. | 0.13% | 1.27% | 1.14% |
56.5% of MMID is already inside IVV.
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, IVV or MMID?
IVV has an expense ratio of 0.03% while MMID charges 0.59%. IVV is the cheaper option, by $56 a year on a $10,000 investment.
Which performed better, IVV or MMID?
Over the past year IVV returned +17.57% vs +7.01% for MMID, so IVV leads on 1-year performance. Past performance does not guarantee future results. This is information, not a recommendation.
Which is riskier, IVV or MMID?
IVV has been the more volatile fund at 13.4% annualized versus 9.9% for MMID.
Should I hold both IVV and MMID?
IVV and MMID have a monthly-return correlation of 0.54, 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 IVV and MMID?
56.5% of MMID's money is in holdings IVV also owns. 56.5% of MMID's is in holdings IVV also owns. They hold 55 positions in common, counted across the 505 positions we hold weights for in IVV and 106 in MMID.
Which pays a higher dividend, IVV or MMID?
IVV yields 1.06% while MMID yields 0.68%, so IVV currently pays the higher dividend yield.
Is MMID better than IVV?
IVV has a lower expense ratio. IVV led over 1Y. MMID is less concentrated, with 15.2% of the fund in its ten largest positions against 37.9%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.