Concentration risk is one of the most common — and most underappreciated — challenges facing high-net-worth investors. A single position that represents 20%, 30%, or 50% of a portfolio introduces a level of idiosyncratic risk that diversification cannot offset.

How Concentration Develops

Concentrated positions rarely appear overnight. They typically develop through one of three paths:

  • Equity compensation: RSUs, stock options, and ESPP shares accumulate over time, often in the same company where the investor's income is also concentrated.
  • Business sale proceeds: A liquidity event creates a large cash or stock position that must be thoughtfully deployed.
  • Long-term appreciation: A position purchased years ago has grown to dominate the portfolio, often with a very low cost basis that makes selling feel costly.

The Risk Is Asymmetric

The problem with concentration is not simply volatility — it is the asymmetry of outcomes. A 50% decline in a position that represents half your portfolio requires a 100% gain just to break even. The mathematics of loss recovery are unforgiving, and the time required to recover can permanently alter retirement timelines and financial plans.

Managing a Concentrated Position

There is no single right answer, but the most common approaches include:

  • Systematic diversification: Selling a defined percentage of the position over time to spread tax impact across multiple years.
  • Exchange funds: Contributing shares to a partnership that pools concentrated positions, achieving diversification without an immediate taxable event (subject to holding period requirements).
  • Charitable strategies: Donating appreciated shares to a donor-advised fund or charitable remainder trust eliminates capital gains on the donated shares while generating a charitable deduction.
  • Protective options: Collars or protective puts can limit downside exposure while maintaining upside participation, though they involve cost and complexity.

The Governance Dimension

Beyond the mechanics, managing a concentrated position requires a clear decision framework — one that defines acceptable risk levels, establishes a diversification timeline, and coordinates across tax, estate, and investment planning. Without that structure, inertia tends to win, and the position remains concentrated far longer than is prudent.