iShares Russell 3000 Fund (IWV)

The iShares Russell 3000 Fund — ticker IWV — is an exchange-traded fund designed to replicate the Russell 3000 Index, a portfolio of roughly 3,000 publicly traded US companies spanning the entire market from the largest to the smallest liquid names. It is effectively a complete US stock market in one fund.

The scope: what “3,000 companies” really means

The Russell 3000 is constructed by starting with the Russell 1000 (the largest 1,000 companies by market cap, representing roughly 90–92 percent of total US stock market value) and adding the next 2,000 eligible companies below that tier. This captures the entire investable US equity market from Apple and Microsoft down to thousands of small-cap names most retail investors have never heard of. The index includes every sector: technology, health care, industrials, consumer, energy, real estate, financials, and utilities.

IWV holds nearly all 3,000 component stocks, weighted by market capitalization. Apple and other giants are large positions; smaller holdings are tiny. This market-weight structure means the fund naturally allocates more capital to larger, more economically significant companies — a sensible approach since larger firms have lower failure risk and tend to drive broader market returns.

How complete is the picture?

The Russell 3000 covers approximately 98 percent of the total US stock market. The remaining 2 percent consists of very small micro-cap stocks, illiquid penny stocks, and recently listed companies not yet eligible for the index. For nearly all investors, IWV represents “the entire US stock market” in a single low-cost fund. Any investment-grade US company worth owning is likely already in this index.

Because of this comprehensiveness, IWV’s long-term return essentially tracks the return of the US equity market as a whole. The S&P 500 — a narrower index of 500 large-cap companies — historically returns very similarly to the Russell 3000 over decades, though with different short-term paths (the S&P 500 outperforms in growth years, the Russell 3000 catches up when smaller and mid-sized companies outperform). Over rolling 10-year periods, the differences are modest.

Cost and structure

IWV carries an expense ratio of well under 0.2 percent per year, making it one of the cheapest vehicles for total US market exposure. The fund is heavily traded (average daily volume in the millions of shares) and holds tens of billions of dollars in assets. Bid-ask spreads are negligible for typical investors. Being a large, established product, it is unlikely to be merged or discontinued.

What does the small-cap and mid-cap tilt add?

Because IWV includes thousands of small and mid-cap companies alongside the large-cap core, it carries more volatility than an S&P 500 fund during periods when size-based returns diverge. In some years (especially recovery from recessions), small and mid-caps dramatically outperform the S&P 500. In other periods (especially prolonged low-growth or high-rate environments), the opposite is true. Over long periods, these effects roughly cancel, but for investors with a short time horizon, the extra small-cap and mid-cap exposure is a real source of volatility.

The Russell 3000 is also rebalanced annually, which means each year the index reconstitutes to reflect changing market caps and eligibility. Funds tracking it must buy newly promoted stocks and sell those that fall below the threshold — a process that incurs small costs and occasional tax implications for shareholders.

Who is this for, and how to research it

IWV works as the core equity holding in a simple, low-cost portfolio. Because it covers the entire market, it is redundant with a combination of separate S&P 500, mid-cap, and small-cap funds — but for someone seeking one fund that needs no further equity diversification, IWV is efficient.

Investors should consult the fund’s fact sheet and prospectus (from Blackrock) for current holdings, sector weights, and expense details. Over time, the fund’s performance very closely matches the Russell 3000 Index performance, so historical returns for the index give a clear picture of what to expect.