What Is IWR? iShares Russell Mid-Cap ETF

IWR is the iShares Russell Mid-Cap ETF, launched by BlackRock in July 2001. It seeks to match the price and yield of the Russell Midcap Index, a benchmark that captures the middle capitalization tier of the U.S. stock market. In one ticker you get roughly 800 mid-sized companies, a segment that sits between the mega-cap names in an S&P 500 fund and the small caps in a Russell 2000 fund.

The fund charges an expense ratio of about 0.19% a year and manages roughly $55 billion in assets as of mid-2026. Its scale gives it deep liquidity and tight trading spreads, and its broad, market-value-weighted design keeps any single stock from dominating the portfolio.

Approximate weights as of mid-2026; refresh quarterly from BlackRock (iShares)'s fund page. Each ticker links to its individual stock guide in Walnut.

IWR is deliberately diffuse. With roughly 800 positions weighted by market value, even the largest holding is only around 1% of the fund. In mid-2026 the top names include Corning, Western Digital, Sandisk, Vertiv Holdings, and Howmet Aerospace, followed by industrials and services companies such as EMCOR Group, financials like Interactive Brokers, and consumer names like Williams-Sonoma.

Because the weights are small and spread across many sectors, IWR behaves like a broad slice of the mid-cap market rather than a concentrated bet. Sector exposure leans toward industrials, technology, and financials, which is typical for the mid-cap tier.

The most common comparison is Vanguard's VO. Both deliver broad U.S. mid-cap exposure, but IWR tracks the Russell Midcap Index while VO tracks the CRSP US Mid Cap Index. The holdings overlap heavily, so the biggest practical difference is fee: IWR at 0.19% versus VO at 0.04%.

IJH (iShares) and MDY (SPDR) track the S&P MidCap 400 instead. That index holds around 400 stocks and applies profitability screens, so it is narrower and reaches less far down the cap range than the roughly 800-stock Russell Midcap. Choosing among them comes down to which index definition and cost you prefer.

IWR's return closely tracks the Russell Midcap Index minus its small fee. Mid-caps historically fall between large caps and small caps on both return and volatility, and they can lead or lag depending on the cycle. IWR is a way to own that whole segment without picking individual winners.

Its long history since 2001 spans multiple market environments. Past performance does not predict future results, and mid-cap stocks can be more volatile than large caps, so the fund's outlook depends on the broad path of mid-sized U.S. companies rather than any single holding.

Walnut is not an investment adviser, and whether IWR fits you depends on your goals, time horizon, and existing holdings. As a broad, low-cost mid-cap index fund, it is often used as a core equity building block or as a satellite tilt to complement a large-cap fund.

If cost is your first priority, VO is cheaper for similar exposure. If you specifically want the Russell Midcap definition or already build around iShares funds, IWR is a straightforward choice. Consider talking to a licensed professional before making portfolio decisions.

IWR trades like any stock during market hours through brokers such as Robinhood, Fidelity, Schwab, and Public. Many of these support fractional shares, so you can invest a set dollar amount rather than buying whole shares. Because IWR is large and liquid, spreads are tight and orders fill easily.

You can also connect your existing brokerage to Walnut to track IWR inside a thematic basket alongside your other positions, monitor how it is doing, and see how it fits your target weights. Walnut is the tracking and intelligence layer; the trade itself stays at your broker.

IWR is a cheap, broad way to own U.S. mid-cap stocks in one ticker. At 0.19% it is a hair pricier than Vanguard's VO (0.04%) but tracks a slightly different, broader index (Russell Midcap vs CRSP). It works as a core building block or a satellite tilt toward mid-sized companies alongside large-cap holdings.

Whether IWR is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is IWR a buy?

IWR yields ~1.1% as of mid-2026, paid by passing through the dividends of its underlying holdings. For the payout schedule, history, and how the distributions are taxed, see IWR dividend: yield and schedule.