Small stocks so far this year have beaten their large-capitalization brethren by a wider margin than they have in more than two decades, raising questions about what is driving the outperformance and what it means for the overall market ahead.
The year-to-date return for small-caps through the end of February was a remarkable 25 percentage points greater than that of large-caps (as measured by the 20% of stocks with the smallest market caps vs. the comparative quintile of the largest). While it isn’t unexpected for small-cap portfolios to beat large-caps over time—a long-term tendency that Wall Street analysts refer to as the “size effect”—what is unusual is the magnitude of the outperformance. It has averaged just 0.9 percentage point over all two-month periods since 1926, according to data from Dartmouth professor Ken French.
You have to go back to January and February of 2000, at the top of the internet-stock bubble on Wall Street, to find a two-month stretch in which the small-caps beat the large-caps by more. Their margin of outperformance over those two months was 41 percentage points.
Any parallel to the top of the internet-stock bubble is ominous, to be sure. But there are several idiosyncrasies to small-caps’ recent performance that stand in the way of drawing any straightforward analogies to the frenzy in small stocks that heralded the 2000 tech-stock crash.
Indeed, according to several researchers, small-caps’ recent strength may actually be something else in disguise—that is, it may have to do with factors other than just size, such as the battle between growth and value stocks.