IWR captures the sweet spot of US equities — companies that have graduated from small-cap volatility but haven't yet reached the mature, slower-growth phase of mega-caps. These $2-50 billion market cap firms often deliver the best risk-adjusted returns over full market cycles.
How It Works
Tracks the Russell Midcap Index, holding roughly 800 stocks ranked 201-1000 by market cap in the Russell 3000. Market-cap weighted with quarterly rebalancing, meaning winners naturally grow their allocation. The annual Russell reconstitution in June can create significant turnover as companies graduate in or out of the mid-cap range.
Key Features
- Broader mid-cap exposure than S&P 400 (800 vs 400 stocks), capturing more of the small-to-mid transition zone
- Lower concentration risk than large-cap funds — top 10 holdings typically under 15% vs 30%+ in S&P 500
- 20+ year track record through multiple cycles, consistently delivering 100-200 bps annual premium over large caps
Risks
- June reconstitution can trigger 20-30% turnover as Russell rebalances, creating taxable events and temporary tracking error
- More sensitive to domestic economic cycles than large caps — expect 20-30% deeper drawdowns in recessions
- Growth tilt during bull markets (60/40 growth/value split) amplifies volatility when momentum reverses
Who Should Own This
Perfect for investors who want higher growth potential than the S&P 500 without venturing into small-cap chaos. Works best as a 10-20% portfolio position for those with 7+ year horizons who can stomach extra volatility. Particularly attractive when large-cap valuations look stretched, as mid-caps often trade at a 10-15% P/E discount.