Data as of Oct 28, 2026.
IWC vs IWO: Differences, Returns & Fees
Over the year to Oct 28, 2026, IWC returned +16.5% to IWO's +7.9%; 10% of their weight is in the same names.
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Net assets on Oct 27, 2026: $1.2bn for iShares Micro-Cap ETF and $14.0bn for iShares Russell 2000 Growth ETF.
Pair scorecard
IWO costs 0.36 points a year less; their one-year returns differ by 8.6 points; IWO is 11.7 times larger.
| Measure | IWC | IWO |
|---|---|---|
| Return | ||
| Total return, 1 year | +16.5% | +7.9% |
| Drawdown | ||
| Below its high | 9.5%, high on Aug 14, 2026 | 9.9%, high on Aug 14, 2026 |
| Benchmark | ||
| What it tracks | Russell Microcap Index | Russell 2000 Growth Index |
| Cost and size | ||
| Expense ratio | 0.60% | 0.24% |
| Net assets, as of Oct 27, 2026 | $1.2bn | $14.0bn |
| Holdings | ||
| Holdings in common | 10% | |
| Top ten holdings, share of the fund | 5.9% | 6.4% |
Holdings in common uses holdings dated Oct 27, 2026. Method
Risk and return
Aug 26, 2005 to Oct 23, 2026 · 1,104 weekly returnsEach against its own benchmark: IWC against IWV, Aug 26, 2005 to Oct 23, 2026; IWO against VTWG, Oct 1, 2010 to Oct 23, 2026.
IWO returned more: +506.8% to +348.0%. IWC and IWO swung about the same: 23.7% and 23.6%. IWO fell less at its worst: −56.5% to −63.8%.
Full scorecard
19 measures, with how each is measured Open ↓
| Measure | IWC | IWO | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +348.0% | +506.8% | IWO | Price change plus distributions, reinvested. |
| Annualized | +7.3% | +8.9% | IWO | Total return as a yearly rate. |
| Price return | +254.5% | +420.4% | IWO | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 23.7% | 23.6% | Tie | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 16.8% | 16.5% | Tie | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −63.8% | −56.5% | IWO | Deepest fall from a high to the low after it. |
| Upside capture | 118.0% | 100.2% | Share of its benchmark's rise caught in the weeks it rose. | |
| Downside capture | 111.7% | 100.1% | Share of its benchmark's fall taken in the weeks it fell. Lower is better. | |
| Beta | 1.16 | 1.00 | Not an edge | How far it moves for each 1% its benchmark moves. |
| R squared | 0.76 | 1.00 | Not an edge | Share of its weekly moves its benchmark explains. |
| Risk-adjusted | ||||
| Sharpe | 0.34 | 0.40 | IWO | Return above Treasury bills per unit of volatility. |
| Sortino | 0.48 | 0.57 | IWO | Return above Treasury bills per unit of downside deviation. |
| Treynor | 0.070 | 0.111 | Return above Treasury bills per unit of beta. | |
| Calmar | 0.11 | 0.16 | IWO | Annualized return divided by the max drawdown. |
| Against the benchmark | ||||
| Benchmark | IWV | VTWG | The ETF each fund is measured against. | |
| Alpha | −3.6% a year | 0.0% a year | Not significant | Yearly return beyond what its beta to the benchmark predicts. |
| Alpha t-stat | −1.41 | 0.06 | Not an edge | How sure the alpha is. Below 2, it could be chance. |
| Alpha range | −8.5% to +1.4% | −0.7% to +0.7% | Includes zero | The 95% range for the yearly alpha. |
| Information ratio | −0.16 | 0.01 | Return against its benchmark per unit of tracking error. | |
| Tracking error | 12.0% | 1.5% | Not an edge | How far weekly returns stray from the benchmark, annualized. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 1,104 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, IWC and IWO hold 10% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.
half
10% in common
Only in one fund ↓
Side by side
IWC and IWO on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IWC and IWO do different jobs. What does each one do in a portfolio?
- What each follows. IWC follows Russell Microcap Index and IWO follows Russell 2000 Growth Index.
- Holdings in common. 10% of the weight is in the same securities (holdings dated Oct 27, 2026).
- One-year total return. Over 1 year to Oct 28, 2026 IWC returned +16.5% and IWO +7.9% with distributions reinvested, a gap of 8.6 points.
Data as of Oct 28, 2026.
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Over the year to Oct 28, 2026 it returned +16.5% with distributions reinvested, against +13.3% for its benchmark, the Russell 3000 Index.
IWC tracks the Russell Microcap. The prospectus expense ratio is 0.60% 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 1,365 positions, with the top ten at 5.9%. It sat 9.5% below its high of Aug 14, 2026 on Oct 28, 2026.
IWO
IWO tracks the Russell 2000 Growth. Over the year to Oct 28, 2026 it returned +7.9% with distributions reinvested, against +8.0% for its benchmark, the Russell 2000 Growth Index. The prospectus expense ratio is 0.24% a year. By its holdings published by its issuer for Oct 27, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 1,122 positions, with the top ten at 6.4%. It sat 9.9% below its high of Aug 14, 2026 on Oct 28, 2026.
Questions people ask
- Which returned more over the last year, IWC or IWO?
- In the year to Oct 28, 2026, with distributions reinvested, IWC returned +16.5% and IWO +7.9%.
- Which is cheaper, IWC or IWO?
- IWO is cheaper, by 0.36 percentage points a year. That is about $36 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, IWC against IWO, data as of Oct 28, 2026. https://etfiq.com/compare/any/iwc-vs-iwo
ETFIQ. (Oct 28, 2026). IWC against IWO. Retrieved from https://etfiq.com/compare/any/iwc-vs-iwo
[IWC against IWO (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/iwc-vs-iwo)
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