Segregated Mandates vs Pooled Funds for HNW Investors

One of the less-discussed but genuinely consequential decisions for HNW investors is whether to hold their investment portfolio through pooled collective investment vehicles — unit trusts, OEICs, ETFs, or investment trusts — or through a segregated mandate, where a professional manager runs a portfolio of individual securities or assets on the client's behalf.

For most retail and mass-affluent investors, this choice does not arise: the minimum investment requirements for segregated mandates typically start at £500,000 and can be £2 million or more for established managers. But at the HNW level, the choice is real and has important implications for tax, cost, customisation, transparency, and the total investment experience.

Pooled Funds: How They Work

In a pooled fund — whether a UK-domiciled OEIC, a unit trust, a Luxembourg SICAV, a US mutual fund, or a listed ETF — multiple investors pool their capital. The fund manager invests the combined pool and each investor owns a proportionate share of the whole. The investor does not own the underlying securities directly; they own units or shares in the fund, which in turn holds the securities.

Pooled funds have several inherent characteristics:

Standardisation — all investors in the same share class experience the same investment exposure. There is no ability to tailor the portfolio to individual tax circumstances, personal preferences, or specific constraints.

Economies of scale — large pools can access a broader range of investments, trade more efficiently, and pass lower costs to investors than most individuals could achieve independently.

Liquidity — open-ended pooled funds (OEICs, unit trusts, UCITS) typically offer daily or weekly dealing, providing liquidity to investors. This is financed by the manager maintaining a liquidity buffer, which creates a slight drag on performance.

No direct ownership — the investor does not own the underlying assets. This has tax, governance, and transparency implications explored below.

Segregated Mandates: How They Work

In a segregated mandate (also called a separately managed account or SMA in the US context), the manager invests the client's capital directly into individual securities — equities, bonds, alternative assets — held in the client's own custody account. The client is the beneficial owner of each security in the portfolio.

The portfolio is constructed specifically for that client (or, in the case of model-portfolio SMAs, largely replicates a house model but with client-specific modifications). The client can see every holding, every transaction, and every income payment at the security level.

The Case for Segregated Mandates

Tax Efficiency

The single most compelling advantage of a segregated mandate for HNW clients is direct ownership of assets, which enables tax management at the position level.

In a pooled fund, the fund manager makes buy and sell decisions without regard to any individual investor's tax position. A UK equity fund may realise a large capital gain by selling a position that has appreciated significantly — distributing that gain (as an equalisation payment or by increasing the unit price) to all investors, including those who would prefer to defer the gain. The investor has no ability to opt out.

In a segregated mandate, the manager — if given appropriate instructions — can defer the realisation of gains, harvest losses in one part of the portfolio to offset gains in another, and time disposals around the client's tax year. For a higher-rate UK taxpayer, the ability to manage the timing of capital gains realisations can save a significant sum in tax over the life of the investment.

For internationally mobile clients, this is even more valuable. An investor who has just arrived in the UK under the FIG (Foreign Income and Gains) regime, for example, may be sheltered from UK tax on gains arising on foreign investments for the first four years. A segregated mandate allows the manager to be responsive to this — crystallising certain gains tax-free during that window — in a way that a pooled fund cannot.

Customisation

Segregated mandates can accommodate a wide range of client-specific requirements:

Exclusions — a client who does not wish to hold tobacco, weapons, certain fossil fuel producers, or any other category of security can have these excluded from their mandate. In a pooled fund, the client has no such control over specific holdings.

Concentrated position management — a client who already holds a large position in a specific company (from a business sale, share scheme, or inheritance) can instruct the segregated manager to exclude that company from the portfolio, avoiding further concentration.

Benchmark customisation — the performance benchmark can reflect the client's specific circumstances (currency, liability matching, income needs).

Tax lot management — holding securities directly allows the manager to identify the specific lots (by original purchase date and price) being sold in any transaction, optimising for capital gains purposes.

Transparency

The client in a segregated mandate receives full transparency on every holding, every transaction, every income payment, and the associated costs. This level of transparency allows the client to:

• Understand exactly what they own
• Verify that the manager is implementing the agreed strategy
• Identify any holdings that conflict with personal values or constraints
• Understand the tax position in detail
• Request independent analysis or a second opinion on specific positions

Pooled fund investors receive a factsheet and annual report, but cannot see the real-time portfolio or verify implementation in the same way.

Access to Corporate Actions and Voting

Direct ownership in a segregated mandate gives the investor access to corporate actions — rights issues, tender offers, takeover bids — on the same basis as any other shareholder. Where the manager operates a proxy voting policy, clients can also influence the voting of their shares.

The Case for Pooled Funds

Lower Minimum Investment

The practical advantage of pooled funds is accessibility. A £10,000 investment in a fund provides exposure to a diversified portfolio of hundreds of securities, something that would be impractical and prohibitively expensive to replicate in a segregated mandate.

Even at the HNW level, certain asset classes are only practically accessible through pooled vehicles: emerging market small-caps, specialist sector funds, high-yield credit, infrastructure funds, and private equity funds all typically operate as pooled structures.

Lower Cost at Smaller Scale

Below a certain portfolio size — typically £500,000 to £1 million for equity portfolios — the all-in cost of a pooled fund (underlying OCF plus platform charge) is lower than the management fee of a segregated mandate. This is because the fixed costs of running a segregated account (dealing, reporting, custody) are not spread across a large pool.

Above approximately £1 million to £2 million, the cost advantage of the largest pooled vehicles narrows relative to segregated mandates, particularly for passive or systematic strategies.

Operational Simplicity

Pooled funds are operationally straightforward: the investor buys and sells units, receives dividends or accumulates income, and reports fund-level income and gains for tax purposes. There is no need to manage individual corporate actions, track dozens of income payments from individual securities, or maintain detailed records of individual cost bases.

For many HNW clients, particularly those with complex business and tax affairs, this operational simplicity is genuinely valuable.

Access to Specialist Managers

Some of the best managers in the world — particularly in specialist asset classes — operate only through pooled vehicles. A client who wants exposure to a market-leading small-cap equity strategy, a specialist natural resources fund, or a specific credit strategy may find that the manager does not offer segregated accounts at any investment level. Pooled funds provide access to these strategies.

Hybrid Approaches

In practice, many HNW portfolios combine both approaches. A typical structure might include:

• A core equity portfolio managed on a segregated basis by a discretionary wealth manager, enabling tax management and exclusions
• Specialist fund allocations to areas where pooled vehicles provide the only practical access: emerging markets, private equity, real assets, hedge funds
• Exchange-traded funds for efficient exposure to asset classes where active management adds limited value (large-cap developed market equities, government bonds)

This hybrid approach combines the tax and customisation advantages of segregated management for the core portfolio with the access and efficiency advantages of pooled vehicles for specialist exposures.

Minimum Investment Requirements

As of 2026, the typical minimum investment for a segregated discretionary mandate with a major UK wealth manager is:

• £500,000 to £1 million for a model-portfolio SMA (with some customisation)
• £2 million or more for a genuinely bespoke segregated mandate
• £5 million or more for access to the largest institutional-quality managers operating segregated accounts

For family offices and UHNW clients, direct access to segregated mandates with major asset managers (BlackRock, LGIM, Schroders) is possible at similar levels.

How Global Investments Can Help

Global Investments advises HNW clients on the structure of their investment portfolios, including the appropriate mix of segregated mandates and pooled vehicles given their asset level, tax position, and investment objectives. For clients approaching or above the minimum threshold for segregated management, we can assess whether the additional cost and complexity is justified by the tax and customisation benefits available.

We work with a range of discretionary managers who offer both model-portfolio and fully bespoke segregated services, and we help clients compare total costs and terms across providers. Contact Global Investments for an objective assessment of how your portfolio should be structured.

This article is for information purposes only and does not constitute financial or investment advice. Tax treatment of investments depends on individual circumstances and may change. The value of investments can fall as well as rise. Past performance is not a guide to future returns.