The main trading day for small cap is approaching: how to prepare for it as an investor

April 30 begins the annual rebalancing of the U.S. Russell indices, which will end at the end of June 2026. At the end of trading their compiler, FTSE Russell, will record the market capitalization of companies, which will give them the right to be included in this or that index. Ma 22, it is planned to publish preliminary lists of participants, which will be updated four more times - Ma 29, then 5, 12 and 18 June. The indexes will be finalized after the markets close on June 26. On Monday, June 29, stock markets will open with updated indices.

Why this is important for an investor was written in this article:

On June 30, FTSE Russell will complete its annual rebalancing of its main index of small-cap companies, the Russell 2000, as well as two others - the Russell 1000 for large companies and the Russell 3000 for the broad market. The rebalancing actually changes the rules of the game for more than 3,000 stocks. And because of this, the day it occurs is usually the largest trading volume of the year. What should an investor know about the index rebalancing this time around?

Every year, about 20% of companies leave the Russell 2000 index and are replaced by new ones, said Georgy Timoshin, an analyst at Freedom Finance Global.

The rebalancing process begins in late April, when the FTSE Russell index compiler ranks companies by capitalization. The selected issuers are included in the Russell 3000, a broader index with 3,000 companies traded on U.S. exchanges. According to Noble Capital Markets, this represents about 98% of the market.

Companies are then allocated to subindices - the Russell 1000 for the largest by capitalization, the Russell 2000 for medium and small, and the Russell MicroCap. The index compiler often uses a buffer zone, according to an investor guide from the Nasdaq exchange. This is a range of values in which non-significant changes in capitalization do not result in the exclusion or inclusion of an asset in an index. The buffer zone, on the one hand, prevents companies whose capitalization is near the "cutoff" from getting into the index just because of a small fluctuation in share price, and on the other hand, makes it difficult to get out of it for the same reason.

The rebalancing is carried out not only by FTSE Russell, but also by S&P Global, the compiler of the S&P 500 for the largest companies and the S&P 600 for mid- and small-cap issuers. To be included in all these indices, companies must have at least 10% of their shares in free float. But S&P indices are updated as needed, for example, during mergers and acquisitions. In addition, there are stricter fundamental rules for getting into these indices, Timoshin adds. U.S. companies that have shown profits for the last quarter and total profits for four consecutive quarters can count on inclusion in the S&P index.

Getting into the index is an important milestone for companies, says Timoshin. He emphasizes three reasons.

- First, passive funds that track the entire index automatically buy securities of new companies included in it. This increases the demand for their shares and increases their trading volume. For example, in 1986, Harvard University economics professor Andrei Shleifer found out: the very news of a company's inclusion in the S&P 500 index leads to an increase in its price, and the actual inclusion in the index increases the price of their shares by about 3% within a few days, Timoshin gives an example.

- Secondly, Wall Street's interest in the companies included in the index is growing: analysts are starting to track the activities of these issuers, and the media are mentioning them more often. This, in turn, may lead to an increase in the interest of retail investors (and not only in terms of passive investments).

- Thirdly, many investors interpret the fact that a company's securities are included in the index as a sign of investment attractiveness.

Investors should understand the methodology and chronology of index rebalancing, Timoshin says.

The Russell index update began on April 30, Noble writes. On Ma. 23, FTSE Russell will publish preliminary data on which companies will be added and which will be excluded. On June 27 after market close, the changes will take effect, and markets will open with the updated Russell indices on June 30.

That's the general rule. But companies that just went public are added to the Russell Index on a quarterly basis. For comparison: S&P, for example, requires that shares be traded for at least 12 full months after an IPO, while the Nasdaq-100 requires three full calendar months.

This year, the rules for forming Russell indices have changed.

In particular, since March of this year, a new methodology of weight limitation (capping) has been implemented for subcategories of indices, including Russell 2000 Growth and Value, Timoshin says. These are value companies and growth companies. Now the maximum weight of one issuer in the index should not exceed 22.5%, despite the size of its capitalization. And the aggregate share of all companies, each of which has a weight of more than 4.5%, should not exceed 45% in the index. That is, in fact, we are talking about limiting the share for "heavyweights" - the largest companies by capitalization.

Starting in 2026, rebalancing will take place every six months - this is required by market dynamics, the index compiler explained.

Why is chronology important for investors? Changes to the index take effect after the market closes; it is actually updated the next trading day.

When the composition of an index changes, all index funds must make a mirror transaction - that is, buy and sell the same stocks, in the same volumes, as in the index. That's why the day trading closes before rebalancing becomes an "unusually large liquidity point" - trading volumes rise sharply, Nasdaq notes.

The Exchange gives such calculations. On index rebalancing days, trading volumes are usually six times higher compared to normal days. In addition, about 40% of all orders to buy or sell shares at the market close price (Market-On-Close) are made by index funds. On normal days, index funds account for about 5% of such orders.

Investors can independently observe potential candidates for inclusion and exclusion from the index and timely buy or sell shares of such issuers, Timoshin notes. Such an approach can become part of a separate trading strategy, he believes.

The "right" time, according to Timoshin, depends on the investor and the strategy. Experienced investors who follow small caps can play a proactive approach by buying potential candidates if, in their opinion, the probability of an issuer being included in the index has increased.

Some investors buy stocks as soon as the list of preliminary candidates for inclusion in the index is announced, usually a month before the final rebalancing, Timoshin says.

Morningstar, a rating agency and investment information provider, on Ma. 13 listed four index-focused funds among the top six best small cap exchange-traded funds to invest in. The agency believes they are suitable buys ahead of a revival of the entire small-cap company sector. So far, such shares are the most undervalued asset of the stock market, but with the easing of monetary policy and economic growth, their quotations can quickly go up.

These include:

- SPDR Portfolio S&P 600 Small Cap ETF, which focuses on stocks from the S&P 600 Small Cap Index.

- Vanguard Small-Cap ETF, which tracks the CRSP US Small Cap index. It includes value stocks, meaning companies with stable business models but less potential than growth stocks.

- The Vanguard Small-Cap Growth ETF is a passive fund that targets growth companies from the CRSP US Small Cap Growth Index.

- The Vanguard Small-Cap Value ETF is a passive fund focused on value stocks of companies in the CRSP US Small Cap Value Index.