Active Fund with 800 Stocks Outperforms Major Indexes: Here's the Secret

In a period of rapidly shifting market dynamics, the actively managed Harbor International Core Fund (HAOSX) has distinguished itself by outperforming major indexes, leveraging a broadly diversified portfolio and a quantitative strategy. Holding 847 stocks as of the end of June, the fund has garnered attention, particularly as market performance broadened in 2026 following several years of dominance by large U.S. technology companies.

The fund's management team employs a quantitative and active approach, evaluating over 30,000 stocks daily based on myriad factors such as quality, value, and momentum. This disciplined process guides stock selection, trading decisions, and portfolio weighting. The Harbor International Core Fund's holding of 847 stocks is nearly eight times the average number of holdings in a median foreign large-blend fund (109 stocks), highlighting its extensive diversification strategy.

Established in 2019, the institutional shares of the Harbor International Core Fund have consistently demonstrated success, ranking eighth in one-year total return, second in average three-year return, and 13th in average five-year return among its peers. The fund's expense ratio, including a temporary reimbursement, stands at 0.85% annually.

The year 2026 has marked a period of broadening market performance, succeeding several years where the largest U.S. technology companies led the gains. During this time, equal-weighted indexes and international stock indexes have outperformed the market-capitalization-weighted S&P 500. For instance, while the S&P 500 (SPX) returned 13.7%, the equal-weighted S&P 500 index (SP500EW) saw a 16.3% return, and the MSCI EAFE Index, which tracks 21 developed markets excluding the U.S. and Canada, returned 15.5%. Moreover, stocks outside the U.S. generally remain relatively inexpensive; the iShares Core MSCI EAFE ETF (IEFA) has a forward Price/Earnings ratio of 15.6, compared to 20 for the State Street SPDR S&P 500 ETF Trust (SPY).

It is a widely acknowledged fact that actively managed funds often struggle to consistently outperform index funds over time. According to a Morningstar study from August 2026, just over 40% of active funds managed to beat their passive counterparts over the one-year period ending June 2026; however, this figure dropped to 25% over a 10-year horizon. Similarly, AJ Bell's report for the first half of 2026 indicated that 42% of active funds outperformed passive alternatives, but this proportion declined to 21% over a 10-year period. The typically higher expense ratios associated with active management compared to passive funds are also a significant factor influencing this performance.

The overall broadening of the market and an increased number of stocks beating indexes could present new opportunities for active managers. However, while the challenge for active funds to consistently outperform indexes in the long run persists, investors must carefully weigh costs, management strategy, and past performance when selecting funds. The case of the Harbor International Core Fund suggests that well-executed strategies of broad diversification and meticulous stock selection can be key to successful active management, especially during evolving market conditions.