‘When an index reaches new highs, is the whole market really moving with it?
Not necessarily.
In the second quarter of 2026, U.S. small-cap equities delivered remarkable returns. Yet beneath the headline numbers, market leadership remained highly concentrated, with a relatively small group of AI-related stocks accounting for a significant share of the Russell 2000’s performance.
In our latest article, we look beyond the index to explore what market concentration can mean for active investors, from the challenges it creates in the short term to the opportunities that can emerge when strong businesses are overlooked.’
Read the full article:Van Berkom: What Does Market Conectration Mean for Active Investors?