Data as of Oct 28, 2026.
IWB vs VO: Differences, Returns & Fees
Over the year to Oct 28, 2026, IWB returned +13.1% to VO's +12.8%; 16% of their weight is in the same names.
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Net assets: $49.1bn on Oct 28, 2026 for iShares Russell 1000 ETF, and $103.4bn on Sep 30, 2026 for Vanguard Morningstar Mid-Cap ETF.
Pair scorecard
VO costs 0.12 points a year less; their one-year returns differ by 0.3 points; VO is 2.1 times larger.
| Measure | IWB | VO |
|---|---|---|
| Return | ||
| Total return, 1 year | +13.1% | +12.8% |
| Drawdown | ||
| Below its high | 3.1%, high on Aug 14, 2026 | |
| Benchmark | ||
| What it tracks | Russell 1000 Index | Morningstar US Mid Cap Index (formerly CRSP US Mid Cap Index) |
| Cost and size | ||
| Expense ratio | 0.15% | 0.03% |
| Net assets, as of Sep 30, 2026 | $48.6bn | $103.4bn |
| Holdings | ||
| Holdings in common | 16% | |
| Top ten holdings, share of the fund | 35.3% | 9.7% |
Holdings in common uses holdings dated Sep 30, 2026 and Oct 27, 2026. Method
Risk and return
Feb 6, 2004 to Oct 23, 2026 · 1,185 weekly returnsIWB returned more: +902.2% to +797.9%. IWB swung less: 17.4% to 19.6%. IWB fell slightly less at its worst: −54.8% to −58.4%.
Full scorecard
9 measures, with how each is measured Open ↓
| Measure | IWB | VO | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +902.2% | +797.9% | IWB | Price change plus distributions, reinvested. |
| Annualized | +10.6% | +10.1% | IWB (slight) | Total return as a yearly rate. |
| Price return | +578.1% | +546.9% | IWB (slight) | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 17.4% | 19.6% | IWB | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 12.3% | 13.8% | IWB | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −54.8% | −58.4% | IWB (slight) | Deepest fall from a high to the low after it. |
| Risk-adjusted | ||||
| Sharpe | 0.57 | 0.50 | IWB | Return above Treasury bills per unit of volatility. |
| Sortino | 0.80 | 0.71 | IWB | Return above Treasury bills per unit of downside deviation. |
| Calmar | 0.19 | 0.17 | IWB | Annualized return divided by the max drawdown. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 1,185 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, IWB and VO hold 16% of their money in the same securities at the same weight. Holdings dated Sep 30, 2026 and Oct 27, 2026.
half
16% in common
Only in one fund ↓
Side by side
IWB and VO on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IWB and VO do different jobs. What does each one do in a portfolio?
- What each follows. IWB follows Russell 1000 Index and VO follows Morningstar US Mid Cap Index (formerly CRSP US Mid Cap Index).
- Holdings in common. 16% of the weight is in the same securities (holdings dated Oct 27, 2026 and Sep 30, 2026).
- Number of holdings. IWB holds 1,025 positions and VO holds 273.
Data as of Oct 28, 2026.
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IWB
IWB tracks the Russell 1000. Over the year to Oct 28, 2026 it returned +13.1% with distributions reinvested, against +13.2% for its benchmark, the Russell 1000 Index. The prospectus expense ratio is 0.15% a year. By its holdings published by its issuer for Oct 27, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 1,025 positions, with the top ten at 35.3%.
VO
VO tracks an index of Mid-Cap. Over the year to Oct 28, 2026 it returned +12.8% with distributions reinvested. The prospectus expense ratio is 0.03% a year. By its holdings published by its issuer as of Sep 30, 2026, 91% of the fund by weight is stocks the S&P 500 also holds, across 273 positions, with the top ten at 9.7%. It sat 3.1% below its high of Aug 14, 2026 on Oct 28, 2026.
Questions people ask
- Which returned more over the last year, IWB or VO?
- In the year to Oct 28, 2026, with distributions reinvested, IWB returned +13.1% and VO +12.8%.
- Which is cheaper, IWB or VO?
- VO is cheaper, by 0.12 percentage points a year. That is about $12 on $10,000 held for a year. Fees come from each fund's prospectus.
Links are sources, not endorsements. A comparison is not a recommendation.
How this is computed
Overlap adds up the smaller of the two weights for each security both funds hold.
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ETFIQ, IWB against VO, data as of Oct 28, 2026. https://etfiq.com/compare/any/iwb-vs-vo
ETFIQ. (Oct 28, 2026). IWB against VO. Retrieved from https://etfiq.com/compare/any/iwb-vs-vo
[IWB against VO (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/iwb-vs-vo)
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