The Russell 2000 fell 7.2% in the third quarter. The Russell 1000, which is where the large companies live, rose 1.8% over the same three months. That is a nine point gap in a single quarter, and it arrived without any recession, any credit event, or any identifiable piece of bad news about small companies.

The year to date figures tell a different story. Through the end of September the Russell 2000 was up 13.7% and the Russell 1000 up 12.3%. So small caps led for most of the year and gave almost all of it back in twelve weeks.

What changed was the rate path, not the companies

The third quarter is when the Federal Reserve raised its target range to 3.75% to 4% and, more consequentially, removed the 2027 cuts from its own projections. The ten year Treasury went from the low fours to above 5.3%, its highest since 2002.

Small caps are the most rate sensitive part of the equity market, and the reason is their balance sheets rather than their business. Large companies term out their debt, issuing ten and thirty year bonds at fixed coupons, so a rate move takes years to reach their interest expense. Smaller companies borrow from banks and in the loan market, where the rate floats and resets within months. A higher policy rate reaches a small company's income statement almost immediately.

Much of this year's small cap rally was built on the assumption that rates were coming down, which would reverse that mechanism and deliver an earnings tailwind. The September projections took that assumption away, and the quarter's performance is what removing it cost.

The case against that reading

Whitmore's Watchlist:
VTWO (Vanguard Russell 2000 ETF): The index this discussion is actually about.
IJR (iShares Core S&P Small-Cap ETF): The S&P 600, which screens for profitability before admitting a company.
AVUV (Avantis U.S. Small Cap Value ETF): Small value, the cheapest corner of the same universe.

It is worth putting the other side fairly, because it is better than it sounds. Research on long historical samples finds little consistent evidence that higher rates produce poor small cap performance; earnings growth explains far more of the variation than the discount rate does. And small cap earnings have in fact been growing, with earnings per share up 19.5% and free cash flow per share up 11.2% on the latest reading.

There is also a point about cash that cuts the other way from the debt argument. Conservatively financed small companies hold cash, and cash now earns four percent for the first time in close to twenty years. For that cohort the rate environment is a benefit rather than a cost.

The trouble is that the index contains both cohorts and does not distinguish between them. Roughly a third of the Russell 2000 consists of companies with no earnings at all, and an unprofitable company with floating rate debt is the purest expression of everything that goes wrong when the discount rate rises and stays there.

Which index you own is the whole question

This is why the choice between the Russell 2000 and the S&P 600 is not a technicality. The S&P small cap index applies a profitability screen before a company is admitted; the Russell does not. In a cycle where the dividing line runs between companies that earn money and companies that need cheap financing to exist, that screen is the exposure.

The valuation case for small caps is genuine and has been for a while. Small and micro cap value remain among the cheapest segments of the American market against their own twenty five year averages, while large cap valuations sit well above theirs. Cheapness has been a poor timing signal and a decent long horizon one.

What the third quarter demonstrated is the cost of being early. An investor who rotated into small caps on the cheapness argument in June has sat through a nine point relative drawdown while being right about the valuation the entire time.

The honest framing is that small caps are a leveraged bet on the rate path rather than a diversifier from the large cap index. They go up more when rates fall and down more when the market concludes that rates are not falling. That is a position, and it should be sized as one.

Whitmore's Take: The third quarter was the market repricing a rate assumption, not a verdict on small companies. Worth knowing whether your small cap fund screens for profits, because that single rule separates the two halves of this trade.

Written by Daniel Whitmore
Millionaire Insiders