IWB vs VOO: holdings overlap, shared companies and scores

As of September 11, 2026, IWB and VOO overlap 91.0% by weight. iShares Russell 1000 ETF (IWB): Russell 1000 index. Vanguard S&P 500 ETF (VOO): S&P 500 index.

Updated September 11, 2026

How much do IWB and VOO overlap?

As of September 11, 2026, IWB and VOO overlap 91.0% by weight.

92% of IWB is already inside VOO.

99% of VOO is already inside IWB.

IWB holds 1,020 companies and VOO holds 504; 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 VOO?

As of September 11, 2026, ETF Copilot scores IWB 5.3 out of 10 and VOO 5.6 out of 10.

They differ most on Risk: IWB 4.9 and VOO 7.5.

The five factor scores behind them are set out below, 0–10 and higher is better, ranked against every US equity ETF we track.

IWB vs VOO — ETF Copilot factor scores, 0–10
Factor	IWB	VOO
Growth	3.2	2.5
Valuation	2.8	2.2
Risk	4.9	7.5
Quality	8.2	8.7
Return	7.4	7.8

VOO is the cheaper of the two at 0.03% 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, VOO charges 0.03% a year, yields 1.12% and holds $1.7T in assets across 504 positions.

IWB vs VOO — cost, income and size
Measure	IWB	VOO
Expense ratio	0.15%	0.03%
Dividend yield	1.10%	1.12%
Assets under management	$49.4B	$1.7T
Holdings	1020	504

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 VOO 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.

VOO trades at 25.2 times earnings, against its own median of 21.5, and is more expensive than 84% of its own 114 monthly readings since 2017.

What moved IWB and VOO 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.

VOO 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 VOO each hold?

What's inside IWB: Tech 44%, Magnificent 7 31%.

35% of IWB is its ten largest holdings.

What's inside VOO: Tech 45%, Magnificent 7 33%.

38% of VOO is its ten largest holdings.

Compare with similar funds

Cite this

ETF Copilot, “IWB vs VOO holdings overlap and scores”, as of September 11, 2026.
https://etf-copilot.com/compare/iwb-vs-voo