Bloomberg The last thing a diversified fund manager wants is to run a portfolio dominated by just seven technology companies — all American, all megacap, clustered in the same corner of the economy. Yet as the S&P 500 pushed to fresh records this week, investors were again forced to confront a painful reality: Keeping pace with the market has largely meant owning little else. A small, tightly linked group of tech super stocks accounted for an outsize share of returns in 2025, extending a pattern in plac ...