IWB vs SEIM: holdings overlap, shared companies and scores
As of September 11, 2026, IWB and SEIM overlap 28.5% by weight. iShares Russell 1000 ETF (IWB): Russell 1000 index. SEI QiM U.S. Large Cap Momentum Active ETF (SEIM): U.S. large-cap momentum stocks.
Updated September 11, 2026
How much do IWB and SEIM overlap?
As of September 11, 2026, IWB and SEIM overlap 28.5% by weight.
40% of IWB is already inside SEIM.
100% of SEIM is already inside IWB.
IWB holds 1,020 companies and SEIM holds 76; 76 are in both.
Computed by ETF Copilot from both funds' holdings rather than quoted from a data provider, and rebuilt nightly.
How does ETF Copilot score IWB and SEIM?
As of September 11, 2026, ETF Copilot scores IWB 5.3 out of 10 and SEIM 6.9 out of 10.
They differ most on Risk: IWB 4.9 and SEIM 7.9.
The five factor scores behind them are set out below, 0–10 and higher is better, ranked against every US equity ETF we track.
| Factor | IWB | SEIM |
|---|---|---|
| Growth | 3.2 | 5.4 |
| Valuation | 2.8 | 4.8 |
| Risk | 4.9 | 7.9 |
| Quality | 8.2 | 8.2 |
| Return | 7.4 | 8.2 |
IWB and SEIM all charge 0.15% a year
As of September 11, 2026, IWB charges 0.15% a year, yields 1.10% and holds $49.4B in assets across 1020 positions.
As of September 11, 2026, SEIM charges 0.15% a year, yields 0.91% and holds $1.5B in assets across 76 positions.
| Measure | IWB | SEIM |
|---|---|---|
| Expense ratio | 0.15% | 0.15% |
| Dividend yield | 1.10% | 0.91% |
| Assets under management | $49.4B | $1.5B |
| Holdings | 1020 | 76 |
Expense ratio, dividend yield and assets under management are reported by the fund and refreshed daily. Every other figure on this page is computed by ETF Copilot.
Where IWB and SEIM trade against their own history
IWB trades at 25.0 times earnings, against its own median of 21.3, and is more expensive than 83% of its own 114 monthly readings since 2017.
SEIM trades at 28.9 times earnings, against its own median of 21.1, and is more expensive than 89% of its own 53 monthly readings since 2022.
What moved IWB this week
IWB fell 1.2% in the week to September 11, 2026. The holdings that moved it most were Nvidia (−4.4%), Microsoft (−2.8%) and Eli Lilly (−3.8%); Advanced Micro Devices (+13.1%) pushed the other way.
What do IWB and SEIM each hold?
What's inside IWB: Tech 44%, Magnificent 7 31%.
35% of IWB is its ten largest holdings.
What's inside SEIM: Tech 47%, Magnificent 7 20%.
36% of SEIM is its ten largest holdings.
Compare with similar funds
Cite this
ETF Copilot, “IWB vs SEIM holdings overlap and scores”, as of September 11, 2026.
https://etf-copilot.com/compare/iwb-vs-seim
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