IWM vs SEIS
iShares Russell 2000 ETF vs SEI Select Small Cap ETF
Which is better, IWM or SEIS?
Nearly the same fund. IWM costs less.
IWM has a lower expense ratio. IWM led over the full window, SEIS over 1Y. The two have moved almost in lockstep, correlation 0.96. IWM is less concentrated, with 3.5% of the fund in its ten largest positions against 10.5%.
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 | IWM | SEIS |
|---|---|---|
| Expense Ratio | 0.19%Best | 0.55% |
| AUM | $76.0B | $607M |
| Dividend Yield | 0.98% | 0.35% |
| Holdings | 1,972 | 767 |
| YTD Return | +9.82% | +10.36%Best |
| 1Y Return | +10.58% | +11.88%Best |
| 3Y Return (annualized) | +17.51% | - |
| 5Y Return (annualized) | +5.03% | - |
| Volatility (annualized) | 18.4%Tie | 18.4%Tie |
| Max Drawdown | -27.5% | -25.7%Best |
| $10,000 over 2 years | $12,764Best | $12,417 |
| Top 10 Weight | 3.5%Best | 10.5% |
| Fund Family | iShares by BlackRock (US) | SEI EXCHANGE TRADED FUNDS |
| Category | Equity | Equity |
| Style | Small Cap Blend | Small Cap Blend |
| Inception | May 22, 2000 | Oct 8, 2024 |
Volatility and max drawdown, and the $10,000 over 2 years row, are measured over the window both funds cover: Oct 10, 2024 to Oct 14, 2026 (2 years).
IWM vs SEIS 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 2 years both funds cover.
IWM vs SEIS Performance
iShares Russell 2000 ETF (IWM) is an ETF from iShares by BlackRock (US) and SEI Select Small Cap ETF (SEIS) is an ETF from SEI EXCHANGE TRADED FUNDS. Over the past year IWM returned +10.58% while SEIS returned +11.88%. Year to date, IWM is up 9.82% versus a gain of 10.36% for SEIS.
Past performance does not guarantee future results.
Risk: Volatility and Drawdowns
IWM and SEIS have been equally volatile, both at 18.4% annualized.
The deepest peak-to-trough decline in our data was -27.5% for IWM and -25.7% for SEIS. Drawdown depth is what each fund did in the worst stretch of the window measured above.
The two funds' monthly returns correlate at 0.96. They move almost in lockstep, so holding both mostly duplicates the same exposure.
Fees and Cost Over Time
IWM charges 0.19% per year while SEIS charges 0.55%. On a $10,000 position that is $19 vs $55 annually, a gap of $36 per year that compounds over a long holding period. On income, IWM currently yields 0.98% against 0.35% for SEIS.
Holdings Overlap
30.1% of IWM's money is in holdings SEIS also owns. 77.7% of SEIS's money is in holdings IWM also owns.
Most of SEIS is already inside IWM. Owning both mostly buys the same companies twice.
300 positions in common, counted across the 1,973 positions we hold weights for in IWM and 369 in SEIS, against full books of 1,972 and 767.
What only one of them owns
Our book lists 58 positions for SEIS that do not appear in our book for IWM (19.1% of the fund), and 1,403 for IWM that do not appear in SEIS (66.9%).
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 IWM | Weight in SEIS | Difference |
|---|---|---|---|
| ANFAbercrombie & Fitch Co. Class A | 0.20% | 1.24% | 1.04% |
| CNOCno Financial Group Inc | 0.16% | 1.27% | 1.11% |
| TEXTerex Corp | 0.21% | 1.07% | 0.86% |
| JXNJackson Financial Inc USD | 0.26% | 1.01% | 0.75% |
| URBNUrban Outfitters Inc | 0.15% | 1.09% | 0.94% |
| ZWSZurn Elkay Water Solutions | 0.24% | 0.94% | 0.70% |
| ENVAEnova International Inc. (usd) | 0.14% | 1.00% | 0.86% |
| CMCCommercial Metals Co | 0.24% | 0.88% | 0.64% |
| ONBOld National Bancorp/In Common Stock | 0.30% | 0.80% | 0.50% |
| DIODDiodes Inc 0.00000000 | 0.15% | 0.88% | 0.73% |
77.7% of SEIS is already inside IWM.
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, IWM or SEIS?
IWM has an expense ratio of 0.19% while SEIS charges 0.55%. IWM is the cheaper option, by $36 a year on a $10,000 investment.
Which performed better, IWM or SEIS?
Over the past year IWM returned +10.58% vs +11.88% for SEIS, so SEIS leads on 1-year performance. Over the longest common window we track (2 years), IWM annualized +12.98% vs +11.43% for SEIS. Past performance does not guarantee future results. This is information, not a recommendation.
Which is riskier, IWM or SEIS?
IWM and SEIS have been equally volatile, both at 18.4% annualized. Worst drawdown: IWM -27.5% vs SEIS -25.7%.
Should I hold both IWM and SEIS?
IWM and SEIS have a monthly-return correlation of 0.96, so they move almost identically. What is left to separate them is the fee and the index each one tracks. This is information, not a recommendation.
What is the holdings overlap between IWM and SEIS?
77.7% of SEIS's money is in holdings IWM also owns. 77.7% of SEIS's is in holdings IWM also owns. They hold 300 positions in common, counted across the 1,973 positions we hold weights for in IWM and 369 in SEIS.
Which pays a higher dividend, IWM or SEIS?
IWM yields 0.98% while SEIS yields 0.35%, so IWM currently pays the higher dividend yield.
Is SEIS better than IWM?
IWM has a lower expense ratio. IWM led over the full window, SEIS over 1Y. The two have moved almost in lockstep, correlation 0.96. IWM is less concentrated, with 3.5% of the fund in its ten largest positions against 10.5%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.