Data as of Oct 28, 2026.
IWC vs SPSM: Differences, Returns & Fees
Over the year to Oct 28, 2026, IWC returned +16.5% to SPSM's +17.6%; 2% 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 $16.0bn for State Street SPDR Portfolio S&P 600 Small Cap ETF.
Pair scorecard
SPSM costs 0.57 points a year less; their one-year returns differ by 1.1 points; SPSM is 13.3 times larger.
| Measure | IWC | SPSM |
|---|---|---|
| Return | ||
| Total return, 1 year | +16.5% | +17.6% |
| Drawdown | ||
| Below its high | 9.5%, high on Aug 14, 2026 | 6.7%, high on Aug 14, 2026 |
| Benchmark | ||
| What it tracks | Russell Microcap Index | S&P SmallCap 600 Index |
| Cost and size | ||
| Expense ratio | 0.60% | 0.03% |
| Net assets, as of Oct 27, 2026 | $1.2bn | $16.0bn |
| Holdings | ||
| Holdings in common | 2% | |
| Top ten holdings, share of the fund | 5.9% | 5.3% |
Holdings in common uses holdings dated Oct 27, 2026. Method
Risk and return
Jul 19, 2013 to Oct 23, 2026 · 692 weekly returnsEach against its own benchmark: IWC against IWV, Aug 26, 2005 to Oct 23, 2026; SPSM against IJR, Jul 19, 2013 to Oct 23, 2026.
SPSM returned slightly more: +222.7% to +208.5%. SPSM swung slightly less: 21.2% to 22.8%. SPSM fell slightly less at its worst: −41.9% to −45.2%.
Full scorecard
19 measures, with how each is measured Open ↓
| Measure | IWC | SPSM | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +208.5% | +222.7% | SPSM (slight) | Price change plus distributions, reinvested. |
| Annualized | +8.8% | +9.2% | SPSM (slight) | Total return as a yearly rate. |
| Price return | +164.6% | +158.2% | IWC (slight) | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 22.8% | 21.2% | SPSM (slight) | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 15.8% | 14.6% | SPSM (slight) | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −45.2% | −41.9% | SPSM (slight) | Deepest fall from a high to the low after it. |
| Upside capture | 118.0% | 99.1% | Share of its benchmark's rise caught in the weeks it rose. | |
| Downside capture | 111.7% | 100.3% | 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 | 0.99 | Not an edge | Share of its weekly moves its benchmark explains. |
| Risk-adjusted | ||||
| Sharpe | 0.40 | 0.43 | SPSM (slight) | Return above Treasury bills per unit of volatility. |
| Sortino | 0.58 | 0.63 | SPSM (slight) | Return above Treasury bills per unit of downside deviation. |
| Treynor | 0.070 | 0.091 | Return above Treasury bills per unit of beta. | |
| Calmar | 0.20 | 0.22 | SPSM | Annualized return divided by the max drawdown. |
| Against the benchmark | ||||
| Benchmark | IWV | IJR | The ETF each fund is measured against. | |
| Alpha | −3.6% a year | −0.5% a year | Not significant | Yearly return beyond what its beta to the benchmark predicts. |
| Alpha t-stat | −1.41 | −0.73 | Not an edge | How sure the alpha is. Below 2, it could be chance. |
| Alpha range | −8.5% to +1.4% | −1.8% to +0.8% | Includes zero | The 95% range for the yearly alpha. |
| Information ratio | −0.16 | −0.20 | Return against its benchmark per unit of tracking error. | |
| Tracking error | 12.0% | 2.4% | Not an edge | How far weekly returns stray from the benchmark, annualized. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 692 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, IWC and SPSM hold 2% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.
half
2% in common
Only in one fund ↓
Side by side
IWC and SPSM on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IWC and SPSM are built for the same job. How do they differ in cost, holdings and results?
- What each follows. IWC follows Russell Microcap Index and SPSM follows S&P SmallCap 600 Index.
- Holdings in common. 2% of the weight is in the same securities (holdings dated Oct 27, 2026).
- Cost. IWC charges 0.60% of assets a year and SPSM 0.03%, a gap of 0.57 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.
SPSM
SPSM tracks an index. Over the year to Oct 28, 2026 it returned +17.6% with distributions reinvested, against +17.5% for its benchmark, the S&P SmallCap 600 Index. The prospectus expense ratio is 0.03% 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 609 positions, with the top ten at 5.3%. It sat 6.7% below its high of Aug 14, 2026 on Oct 28, 2026.
Questions people ask
- Which returned more over the last year, IWC or SPSM?
- In the year to Oct 28, 2026, with distributions reinvested, IWC returned +16.5% and SPSM +17.6%.
- Which is cheaper, IWC or SPSM?
- SPSM is cheaper, by 0.57 percentage points a year. That is about $57 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 SPSM, data as of Oct 28, 2026. https://etfiq.com/compare/any/iwc-vs-spsm
ETFIQ. (Oct 28, 2026). IWC against SPSM. Retrieved from https://etfiq.com/compare/any/iwc-vs-spsm
[IWC against SPSM (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/iwc-vs-spsm)
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