IWB vs SPY: holdings overlap, shared companies and scores
As of September 11, 2026, IWB and SPY overlap 92.1% by weight. iShares Russell 1000 ETF (IWB): Russell 1000 index. State Street SPDR S&P 500 ETF (SPY): S&P 500 index exposure.
Updated September 11, 2026
How much do IWB and SPY overlap?
As of September 11, 2026, IWB and SPY overlap 92.1% by weight.
92% of IWB is already inside SPY.
100% of SPY is already inside IWB.
IWB holds 1,020 companies and SPY holds 501; 496 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 SPY?
As of September 11, 2026, ETF Copilot scores IWB 5.3 out of 10 and SPY 5.3 out of 10.
They differ most on Quality: IWB 8.2 and SPY 8.8.
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 | SPY |
|---|---|---|
| Growth | 3.2 | 2.7 |
| Valuation | 2.8 | 2.2 |
| Risk | 4.9 | 5.0 |
| Quality | 8.2 | 8.8 |
| Return | 7.4 | 7.8 |
SPY is the cheaper of the two at 0.09% 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, SPY charges 0.09% a year, yields 1.11% and holds $806.1B in assets across 501 positions.
| Measure | IWB | SPY |
|---|---|---|
| Expense ratio | 0.15% | 0.09% |
| Dividend yield | 1.10% | 1.11% |
| Assets under management | $49.4B | $806.1B |
| Holdings | 1020 | 501 |
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 SPY 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.
SPY trades at 25.4 times earnings, against its own median of 21.6, and is more expensive than 84% of its own 114 monthly readings since 2017.
What moved IWB and SPY 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.
SPY fell 1.1% 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 SPY each hold?
What's inside IWB: Tech 44%, Magnificent 7 31%.
35% of IWB is its ten largest holdings.
What's inside SPY: Tech 46%, Magnificent 7 34%.
38% of SPY is its ten largest holdings.
Compare with similar funds
Cite this
ETF Copilot, “IWB vs SPY holdings overlap and scores”, as of September 11, 2026.
https://etf-copilot.com/compare/iwb-vs-spy
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