Managing Concentrated Stock Positions: Strategies for Business Owners and Senior Executives

One of the most common wealth management challenges for high-net-worth individuals — and one of the least discussed — is the concentrated stock position. This is a situation where a significant proportion of a person's net worth is held in a single company's shares.

Concentrated positions arise from several routes: a successful business that has been partially listed; executive share schemes and long-term incentive plans (LTIPs) that have paid out generously over many years; an inheritance of a significant shareholding in a family business; or the shares of an acquiring company received as consideration in a business sale.

Whatever the source, the financial risk is the same: an individual whose net worth is substantially tied to the performance of a single company is exposed to catastrophic wealth destruction if that company fails, is disrupted, or simply underperforms the market.

The psychological barrier to diversifying is equally consistent: the company is one the individual knows intimately, has faith in, and has already made money from. Selling feels like a betrayal — or like sacrificing future gains.

This guide sets out the analytical framework for thinking about concentrated positions and the practical strategies for reducing them over time.

The Risk of Concentration: The Evidence

The counterargument to diversifying is often: "I know this company better than any fund manager. Why would I trade a great company I understand for a basket of averages?"

The evidence does not support this comfort. Studies of individual company stock performance consistently show that the distribution of returns is highly skewed: a minority of stocks produce extraordinary long-term returns, while the majority underperform or fail to survive as independent companies over a 20-year period.

A study of Russell 3000 companies found that approximately 40% of all US stocks experienced a "catastrophic loss" — a permanent decline of 70% or more from their peak price — during their listed life. Among the S&P 500's constituents at any given point, approximately half will no longer be independent companies (through merger, acquisition, bankruptcy, or delisting) a decade later.

The company you know best is not exempt from this distribution. Enron's employees, WorldCom's management, Lehman Brothers' senior partners — all held concentrated positions in companies they knew and trusted. The knowledge advantage did not protect them from concentrated risk.

When to Diversify and When to Wait

The decision to reduce a concentrated position is partly a financial optimisation and partly a timing question. Two key variables determine the urgency:

The size of the unrealised gain: A position with a small embedded gain (because the shares were acquired recently at a high price) can be diversified with minimal tax cost. A position with a large embedded gain (bought or acquired cheaply years ago) carries a significant latent CGT liability that will crystallise on any disposal.

The fundamental outlook for the company: A concentrated position in a company that is genuinely exceptional — monopolistic position, consistent earnings growth, strong management — carries less risk than a position in a company facing structural disruption, succession challenges, or regulatory headwinds. The urgency to diversify is higher where the company outlook is more uncertain.

The general principle is: the larger the position relative to overall net worth, and the larger the CGT cost of diversifying, the more carefully the strategy needs to be planned. But concentration risk itself does not diminish over time merely because you are waiting for a better opportunity — it remains present regardless.

Strategies for Reducing Concentration

The Systematic Disposal Programme

The simplest approach is a structured programme of annual disposals, each calibrated to utilise the CGT annual exemption and stay below the higher-rate band where possible.

In the UK, the CGT annual exemption is currently £3,000 — a modest amount that limits the tax-free disposal capacity. However, combining the annual exemption with careful timing (crystallising gains in years of lower income, using the basic-rate band), a programme of systematic disposals over 5-10 years can reduce a concentrated position while managing the average effective CGT rate.

For non-UK residents, the CGT annual exemption may not be available on NRCGT-liable assets. But the rate optimisation (timing disposals to low-income years) remains relevant.

Spousal or Civil Partner Transfers

Transfers of shares between spouses or civil partners are CGT-free at any value. If one partner has a higher CGT rate (due to higher income) and the other is at the basic rate or below, transferring shares to the lower-rate partner before disposal can reduce the CGT charge on a disposal from 24% to 18% — a 25% saving on the tax bill.

Additionally, where both partners have annual exemptions and basic-rate band capacity, effective joint use of these can double the tax-free and lower-rate disposal capacity compared to a single individual.

Charitable Giving

Donations of shares to charity are not subject to CGT in the UK. If you donate shares with an embedded gain to a UK-registered charity (or directly to a charitable fund such as a Donor Advised Fund), the gain is simply not taxable — and the donor also receives income tax relief on the market value of the donated shares.

This is particularly powerful for very high-gain positions, where the effective cost of a charitable donation is substantially reduced by the combined CGT exemption and income tax relief. The charity receives the full market value; the donor receives income tax relief; and the gain disappears.

This strategy requires a genuine philanthropic intent — but for individuals with charitable goals, it is extraordinarily tax-efficient.

Exchange Funds (for US-Based Investors)

In the US, "exchange funds" (also called swap funds) allow an investor with a concentrated stock position to contribute their shares to a pool alongside other concentrated investors, and receive in return a diversified portfolio of shares — without triggering a CGT liability at the time of the exchange. The CGT is deferred until eventual disposal of the new portfolio.

Exchange funds are not available in the UK but are an important tool for US citizens holding concentrated positions, and may be relevant for UK nationals with US-listed concentrated positions.

Collar Strategies (Options)

For listed shares, options strategies — specifically a "collar" (buying a put option to protect against downside while selling a call option to cap upside gain) — can reduce the economic risk of a concentrated position without triggering an immediate CGT event.

A collar does not eliminate the position; it limits the range of outcomes. It does not defer CGT indefinitely — HMRC and other tax authorities have specific rules on when option strategies trigger disposal events. Expert advice before implementing any options strategy is essential.

Employee Benefit Trusts and Tax-Advantaged Share Schemes

For shares received through UK-approved share schemes (Enterprise Management Incentive schemes, Share Incentive Plans, etc.), specific rules apply to the treatment of gains. Shares held in an SIP for five years can be transferred to an ISA without triggering CGT. EMI options have their own tax regime with potentially favourable CGT treatment.

If the concentrated position arose through an executive share scheme, understanding the specific scheme rules and their interaction with CGT planning is the starting point.

The Offshore Investment Bond Route

For very large positions where annual CGT management is insufficient and charitable giving is not appropriate, an offshore investment bond can be used to hold the diversified portfolio going forward — but the original concentrated shares must first be disposed of and the proceeds reinvested. This does not avoid the CGT on the original disposal; it provides a tax-efficient wrapper for subsequent investment growth.

For internationally mobile individuals, the interaction of an offshore bond with the FIG regime or the standard non-dom rules (for those still in transitional positions) may create additional efficiency.

How Global Investments Can Help

Managing a concentrated stock position requires a coordinated strategy that addresses the investment risk, the CGT timing, the structural options available, and — for internationally mobile individuals — the cross-border dimension of where the shares are held and where the owner is tax-resident.

Global Investments works with business owners and senior executives to analyse their concentrated positions, model the options for reduction, and develop a structured plan that reduces risk over a realistic time horizon without creating unnecessarily large or badly timed tax events.

This article is for general information purposes only and does not constitute personal financial, investment, or tax advice. The value of investments can fall as well as rise. Tax treatment depends on individual circumstances. Please seek professional advice before taking any action.