Diversifying Concentrated Portfolios: A Multiphase Approach
Finance

Diversifying Concentrated Portfolios: A Multiphase Approach

authorBy Mariana Mazzucato
DateAug 05, 2026
Read time2 min

Many investors with substantial unrealized gains in their stock holdings often find themselves in a dilemma, reluctant to diversify their portfolios due to the potential capital gains tax. However, a strategic, multiphase transition plan offers a solution. This approach allows for the gradual diversification of concentrated assets into more tax-efficient, managed solutions, effectively balancing the need to mitigate risk with the desire to control tax liabilities over time.

Strategic Diversification: Managing Risk and Taxes Through a Phased Transition

For investors navigating the complexities of highly appreciated stock portfolios, the challenge lies in diversifying without incurring significant tax penalties. The multiphase transition plan, championed by financial experts Paul Robertson, Gavin Romm, and Mark Gleason, presents a viable pathway. This strategy centers on a deliberate, step-by-step approach to reallocate assets. Instead of a rapid, large-scale sell-off that could trigger a substantial tax event, the plan advocates for a gradual unwinding of concentrated positions. By establishing an “annual gain budget,” investors can methodically reduce their exposure to single stocks or sectors, spreading the tax impact over several years. This measured approach ensures that diversification occurs without immediate, hefty tax obligations, transforming a potentially daunting task into a manageable process. The integration of balanced direct indexing within a Separately Managed Account (SMA) further enhances this strategy. This innovative method allows for simultaneous equity and municipal bond exposure, enabling tax-loss harvesting across both asset classes. This capability is particularly beneficial as it permits losses from one segment to offset gains in another, thereby accelerating the diversification process while maintaining tax efficiency. The benefits extend beyond individual investors, offering financial advisors a powerful tool to engage clients in meaningful discussions about long-term financial health, risk management, and strategic tax planning.

The implementation of a multiphase transition strategy provides a pragmatic and tax-conscious solution for investors burdened by concentrated stock positions. It underscores the importance of thoughtful financial planning, allowing individuals to pursue greater portfolio diversification and risk reduction while maintaining control over their tax obligations. This method not only offers a pathway to a more balanced investment future but also empowers financial advisors to deliver more holistic and client-centric advice.

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