AESB vs RESM
Harbor AlphaEdge Small Cap Core ETF vs Columbia Research Enhanced Small Cap ETF
Which is better, AESB or RESM?
RESM costs less.
RESM has a lower expense ratio. AESB is less concentrated, with 22.6% of the fund in its ten largest positions against 76.5%.
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 | AESB | RESM |
|---|---|---|
| Expense Ratio | 0.38% | 0.32%Best |
| AUM | $2M | $6M |
| Dividend Yield | 0.00% | 0.08% |
| Holdings | 331 | 2,051 |
| YTD Return | -4.24% | +13.69%Best |
| Top 10 Weight | 22.6%Best | 76.5% |
| Fund Family | Harbor Funds | Columbia Threadneedle Investments |
| Category | Equity | Equity |
| Style | Small Cap Blend | Small Cap Blend |
| Inception | Aug 26, 2026 | Dec 11, 2025 |
Not shown on this pair: 1Y Return, 3Y Return (annualized), 5Y Return (annualized), Volatility (annualized), Max Drawdown, $10,000 over the window.
AESB vs RESM 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.
AESB vs RESM Performance
Harbor AlphaEdge Small Cap Core ETF (AESB) is an ETF from Harbor Funds and Columbia Research Enhanced Small Cap ETF (RESM) is an ETF from Columbia Threadneedle Investments. Year to date, AESB is down 4.24% versus a gain of 13.69% for RESM.
Past performance does not guarantee future results.
Fees and Cost Over Time
AESB charges 0.38% per year while RESM charges 0.32%. On a $10,000 position that is $38 vs $32 annually, a gap of $6 per year that compounds over a long holding period. On income, AESB currently yields 0.00% against 0.08% for RESM.
Holdings Overlap
We hold position weights for 167 holdings in AESB and 25 in RESM, totalling 99.8% and 100.0% of the two funds. The two books name no position in common, so there is no overlap percentage to show.
0 positions in common, counted across the 167 positions we hold weights for in AESB and 25 in RESM, against full books of 331 and 2,051.
What only one of them owns
Our book lists 7 positions for RESM that do not appear in our book for AESB (27.7% of the fund), and 152 for AESB that do not appear in RESM (88.3%).
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.
You are not choosing between two funds in isolation.
Whichever of AESB and RESM 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, AESB or RESM?
AESB has an expense ratio of 0.38% while RESM charges 0.32%. RESM is the cheaper option, by $6 a year on a $10,000 investment.
Which pays a higher dividend, AESB or RESM?
AESB yields 0.00% while RESM yields 0.08%, so RESM currently pays the higher dividend yield.
Is RESM better than AESB?
RESM has a lower expense ratio. AESB is less concentrated, with 22.6% of the fund in its ten largest positions against 76.5%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.