Indexes · Small cap
Russell 2000 Components
Membership is decided by rank rather than by judgement: the largest 3,000 US companies are ranked, the top 1,000 are taken out, and what remains is this index. That single rule explains almost everything about how it behaves.
The rule, in one sentence
FTSE Russell ranks eligible US companies by market capitalisation on a set date. The largest 3,000 form the Russell 3000; the top 1,000 of those are the Russell 1000; the remaining 2,000 are this index.
No committee decides. No sector balance is imposed. No profitability, revenue or governance test is applied at this stage, a company that qualifies on the eligibility rules and lands in ranks 1,001 to 3,000 is a constituent, and one that does not is not. Almost every property people attribute to the Russell 2000 follows from that mechanical definition rather than from any view about what small-cap investing should be.
Reconstitution is the event
Because the list is rebuilt from a ranking taken on one day, everything that changes about the index changes at once, traditionally at the June reconstitution, using a rank date some weeks before it. Hundreds of companies move between the segments, are added from the microcap tail below, or drop out entirely.
The market consequence is unavoidable and worth understanding. Every fund tracking the index must hold the new list, and it must do so at the same reference prices, so an enormous quantity of stock changes hands in a single closing auction. Reconstitution is regularly among the highest-volume sessions of the American year, and none of that volume carries an opinion: it is obliged trading by funds that have no choice.
For anything on this site that reads volume, that is a date to exclude rather than interpret. A volume spike, a breadth reading or a cumulative volume line computed across reconstitution is describing index maintenance. The same applies, on a smaller scale, to the quarterly IPO additions.
What a ranked cut leaves out
| Property | What follows from the rule |
|---|---|
| No profitability test | Companies with no earnings are constituents if their market value ranks them there. This is the documented divergence from the S&P 600. |
| Membership follows price | A company that doubles can leave the small-cap index by being promoted; one that halves can join it. Recent performance partly determines membership. |
| Fixed count, not a fixed definition | "Small cap" means ranks 1,001–3,000, whatever those companies are worth in a given year. The band's absolute size drifts with the market. |
| A tail below it | Thousands of listed companies rank below 3,000 and are outside the index entirely, the microcap segment is not included. |
The second row is the one most often missed and it matters for interpretation. Because promotion and demotion follow market value, the index is continuously re-sorted by the very returns people then measure it on, a small company that performs well eventually leaves. Any long-run comparison between the small-cap and large-cap segments is a comparison between two moving bands rather than two fixed sets of companies.
Why a ranked index is not a fixed universe
One more consequence of ranking deserves stating on its own, because it quietly undermines a great deal of published comparison. The band is defined by position, not by size, so the companies in it are re-sorted every year by exactly the returns anyone then measures.
A small company whose shares double is likely to be promoted out of the index; a large one that halves may drop into it. Over a decade the small-cap index is therefore not a portfolio anyone could have held. It is a rolling window over a ranked list, and its long-run return reflects the rule as much as it reflects the companies. That is true of every ranked index and it is least visible where the segments are adjacent, as here.
Getting the current list
This page does not reproduce the constituents, and the reason is the same one given on the screener pages: a list of 2,000 tickers is out of date within weeks of the next reconstitution, and a stale list published as a reference is worse than no list at all.
Two current sources are free. FTSE Russell publishes membership around reconstitution. And every ETF tracking the index discloses its full holdings daily: which in practice is the most convenient constituent list available to anyone, updated far more often than any static page could be.
One caution applies to both. A current list describes today, and using it to study the past introduces survivorship bias: every company dropped for shrinking or failing is absent, so a historical test on today’s membership measures the survivors. Studies that need historical membership need historical membership, which is a commercial product.
Why this index appears in a volume reference
Two reasons, both practical. Breadth data is counted across a list, so knowing what a list contains (and that it is rebuilt wholesale once a year) is a prerequisite for reading any advance/decline or new-high figure computed from it.
And the reconstitution is the clearest example in the American calendar of volume that carries no opinion. Everything on this site turns on the idea that volume is the record of effort; a session where thousands of funds trade because a rule tells them to is the exception that proves how carefully the idea has to be applied.
Frequently asked questions
How is Russell 2000 membership decided?
By rank, not by committee. FTSE Russell ranks eligible US companies by market capitalisation on a set date, takes the largest 3,000 as the Russell 3000, and splits it: the top 1,000 become the Russell 1000 and the next 2,000 become the Russell 2000. Nothing about profitability, sector or size targets enters it. A company is in the index if and only if its rank falls in that band on the day the ranking is taken.
When does the membership change?
At the annual reconstitution, traditionally in late June, using a ranking taken some weeks earlier. Between reconstitutions the list is broadly fixed, with additions only from new listings under FTSE Russell’s quarterly IPO additions. The schedule is the index provider’s to set and has been revised before, so it is worth confirming the current calendar with FTSE Russell rather than assuming June.
Why does reconstitution day matter so much?
Because every fund tracking the index has to hold the new list by the close, so thousands of issues change hands at once in the closing auction. It is regularly one of the highest-volume sessions of the American year. None of that volume expresses a view about anything — it is index maintenance — which makes it a trap for any volume-based reading taken on or near that date.
What is banding?
A rule that leaves a company in its existing index unless its rank has moved beyond a threshold around the cut-off, introduced to reduce pointless turnover. Without it, a company sitting near rank 1000 would migrate between the Russell 1000 and 2000 almost every year on noise, forcing both sets of funds to trade it. Banding does not change where the cut is, only how readily a borderline company crosses it.
Why does the Russell 2000 hold unprofitable companies?
Because the rules never ask. Membership is a pure capitalisation ranking, so a company with no earnings that is large enough by market value is in the index exactly as a profitable one is. This is the single documented difference from the S&P 600, which applies a profitability screen, and it is the reason two indices both described as "US small cap" have persistently different characteristics.
Where do I get the current constituent list?
From FTSE Russell, which publishes membership around reconstitution, and from the major ETFs tracking the index, every fund discloses its full holdings daily, which in practice is the most convenient current list available free. This page deliberately does not reproduce one: a list of 2,000 tickers is out of date within weeks and is a maintenance liability rather than a reference.
Why not just use a list from a year ago?
Because the index is reconstituted annually and hundreds of names change. More subtly, using a current list to study the past introduces survivorship bias: every company that was dropped for shrinking or failing is missing, so any historical study on "today’s Russell 2000" measures the survivors and flatters the result. If a study needs historical membership, it needs historical membership.
Does the index include every small US company?
No. The Russell 3000 covers the largest 3,000 eligible companies, and the American market has thousands more below that. The microcap tail sits outside it entirely, in the Russell Microcap Index. Eligibility rules also exclude certain structures and require a minimum price and float, so "small cap" as this index defines it is a band, not everything beneath the large caps.