AEMC vs MMID
Harbor AlphaEdge Mid Cap Core ETF vs MFS Active Mid Cap ETF
Which is better, AEMC or MMID?
AEMC costs less.
AEMC has a lower expense ratio. MMID is less concentrated, with 16.2% of the fund in its ten largest positions against 27.0%.
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 | AEMC | MMID |
|---|---|---|
| Expense Ratio | 0.35%Best | 0.59% |
| AUM | $2M | $36M |
| Dividend Yield | 0.00% | 0.99% |
| Holdings | 198 | 106 |
| YTD Return | -1.35% | +5.51%Best |
| 1Y Return | - | +6.40% |
| Top 10 Weight | 27.0% | 16.2%Best |
| Fund Family | Harbor Funds | MFS Investment Management |
| Category | Equity | Equity |
| Style | Mid Cap Blend | Mid Cap Blend |
| Inception | Aug 26, 2026 | Sep 24, 2025 |
Not shown on this pair: 3Y Return (annualized), 5Y Return (annualized), Volatility (annualized), Max Drawdown, $10,000 over the window.
AEMC 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.
AEMC vs MMID Performance
Harbor AlphaEdge Mid Cap Core ETF (AEMC) is an ETF from Harbor Funds and MFS Active Mid Cap ETF (MMID) is an ETF from MFS Investment Management. Year to date, AEMC is down 1.35% versus a gain of 5.51% for MMID.
Past performance does not guarantee future results.
Fees and Cost Over Time
AEMC charges 0.35% per year while MMID charges 0.59%. On a $10,000 position that is $35 vs $59 annually, a gap of $24 per year that compounds over a long holding period. On income, AEMC currently yields 0.00% against 0.99% for MMID.
Holdings Overlap
4.7% of AEMC's money is in holdings MMID also owns. 8.1% of MMID's money is in holdings AEMC also owns.
MMID and AEMC share little of their money.
7 positions in common, counted across the 111 positions we hold weights for in AEMC and 104 in MMID, against full books of 198 and 106.
What only one of them owns
Our book lists 88 positions for MMID that do not appear in our book for AEMC (83.0% of the fund), and 101 for AEMC that do not appear in MMID (93.1%).
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 AEMC | Weight in MMID | Difference |
|---|---|---|---|
| DXCMDexcom Inc. | 1.46% | 1.02% | 0.44% |
| HPEHewlett Packard Enterprise Co | 0.96% | 1.36% | 0.40% |
| NDSNNordson Corp | 0.99% | 1.18% | 0.19% |
| SNOWSnowflake Inc | 0.41% | 1.32% | 0.91% |
| STESteris Plc | 0.38% | 1.35% | 0.97% |
| CTSHCognizant Technology Solutions Corp. Class A | 0.26% | 1.16% | 0.90% |
| MDBMongodb, Inc. | 0.27% | 0.74% | 0.47% |
You are not choosing between two funds in isolation.
Whichever of AEMC and MMID you pick has to sit alongside everything else you own. Add the rest and see what the combination actually holds.
Free for up to 10 holdings. No account needed.
Frequently Asked Questions
Which is cheaper, AEMC or MMID?
AEMC has an expense ratio of 0.35% while MMID charges 0.59%. AEMC is the cheaper option, by $24 a year on a $10,000 investment.
What is the holdings overlap between AEMC and MMID?
8.1% of MMID's money is in holdings AEMC also owns. 8.1% of MMID's is in holdings AEMC also owns. They hold 7 positions in common, counted across the 111 positions we hold weights for in AEMC and 104 in MMID.
Which pays a higher dividend, AEMC or MMID?
AEMC yields 0.00% while MMID yields 0.99%, so MMID currently pays the higher dividend yield.
Is MMID better than AEMC?
AEMC has a lower expense ratio. MMID is less concentrated, with 16.2% of the fund in its ten largest positions against 27.0%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.