Core-Satellite Strategy

The core-satellite framework attempts to capture the best of both passive and active investing. The core, which represents the majority of the portfolio (often 60-80%), is invested in low-cost, broadly diversified index funds or ETFs tracking major benchmarks such as the S&P 500, total market, or global equity indices. The core is designed to deliver market-rate returns at minimal cost and with minimal tracking error versus the overall market.

The satellite positions, which represent the remaining 20-40% of the portfolio, are actively managed or concentrated holdings intended to generate excess returns above the benchmark. Satellites might include sector ETFs expressing a view on the energy transition, individual stocks where the investor has genuine analytical conviction, actively managed funds with strong track records in a specific niche, alternative assets such as real estate investment trusts (REITs) or commodity positions, or international and emerging market allocations that deviate from the core's geographic tilt.

The intellectual rationale for the core-satellite approach is cost-efficient diversification combined with selective active risk. If markets are broadly efficient, the core ensures the investor captures market returns at low cost and avoids the career risk that comes with large deviations from benchmark. The satellites limit the total cost of active management because only a portion of assets incur active management fees. If the satellites outperform, the excess return is achieved on a relatively small portion of the portfolio, meaning the upside is bounded but so is the cost of underperformance.

For individual investors, core-satellite is particularly practical because the core requires virtually no ongoing management — periodic rebalancing is sufficient. The satellites can be as simple or as sophisticated as the investor's time and analytical capability permit. An investor who follows specific sectors closely can express that knowledge in satellite positions without betting the entire portfolio on those views.

The main risk is that satellite positions underperform, dragging overall returns below the benchmark net of fees. Investors should evaluate satellite positions rigorously and set clear criteria for when to add to, reduce, or eliminate each satellite based on performance relative to expectations, not merely relative to market prices.