Direct Indexing: What It Is and What UK Investors Need to Know

Direct indexing is one of the more discussed innovations in wealth management over the past five years. In the United States, several major investment platforms have launched direct indexing products aimed at affluent and HNW investors, offering them something previously available only to institutions: the ability to own every stock in an index directly, rather than through a pooled fund — and to customise, exclude, and tax-harvest at the individual security level.

For UK investors, direct indexing is less mature and faces structural obstacles that do not exist in the US. However, the underlying concepts — customisation, tax efficiency, and personalised index construction — are relevant to UK investors managing substantial equity portfolios. This guide explains what direct indexing is, how it works in the US context where it is most developed, and what analogous approaches are available and appropriate in the UK.

What Is Direct Indexing?

A conventional index fund or ETF pools capital from many investors and uses it to buy the stocks in an index. The investor owns shares of the fund, not shares of the underlying companies.

Direct indexing replaces the pooled fund with a separately managed account (SMA) holding the underlying stocks directly. If you direct index the S&P 500, your account holds a proportional weight of each of (up to) 500 individual companies, rather than units of a Vanguard ETF.

This creates three meaningful capabilities:

1. Customisation and Exclusions

Because you own the individual stocks, you can exclude specific companies or sectors entirely from your personal index, without affecting other investors. A direct indexing investor can:

• Exclude a company where they work (to avoid further concentration risk — if you own stock options in your employer, you don't need 3% in Apple if Apple is your employer).
• Apply personal ESG exclusions more precisely than any off-the-shelf ESG ETF allows.
• Overweight or underweight specific sectors relative to the benchmark.
• Add supplementary holdings (e.g., individual positions in international stocks alongside a US core).

2. Tax-Loss Harvesting at Individual Stock Level

In a pooled fund, gains and losses are aggregated — you cannot realise a loss on Apple within a fund that is overall at a gain. In a direct indexed portfolio, you own each stock separately. This means:

When Microsoft falls 15% while the overall S&P 500 is flat or up, you can sell Microsoft, realise the loss for tax purposes, and immediately replace it with a closely correlated substitute (a different tech stock or sector ETF) to maintain your index exposure. The portfolio's economic exposure is unchanged, but you have crystallised a tax loss.

Over a full market cycle, systematic tax-loss harvesting at individual stock level generates significantly more tax losses — losses that can be used to offset capital gains elsewhere in your portfolio. The academic evidence suggests this can add 0.5–1.5% per year in after-tax value for a taxable US investor in a volatile market environment.

3. Legacy Stock Management

If you hold a large, concentrated, low-cost-basis position in a single stock (employer equity, inherited shares, business sale proceeds held in equity), you might want to diversify without triggering a large immediate capital gains tax bill. Direct indexing allows you to overlay index stocks around your existing concentrated position — effectively building an index portfolio that starts from your existing holdings and adds the rest of the index around them, reducing concentration over time as the existing position is sold in tandem with tax-loss harvested sales elsewhere.

The US Direct Indexing Ecosystem

In the US, direct indexing is now offered by:

• Vanguard Personalised Indexing (formerly Just Invest): From $100,000 minimum; annual fee 0.20%.
• Fidelity Managed FidFolios: From $5,000; annual fee 0.40%.
• Schwab Personalised Indexing: From $100,000; annual fee 0.40%.
• BlackRock Aperio (institutional): From $1 million; institutional pricing.
• Parametric (a Morgan Stanley company): One of the largest and longest-established direct indexing providers.

The US market has driven rapid adoption because:

1. Zero commission trading: US platforms eliminated share trading commissions in 2019. Rebalancing a 500-stock portfolio is costless in transaction fees.
2. Tax-loss harvesting value is high: With a federal CGT rate of 20% plus state tax, tax-loss harvesting can generate significant after-tax alpha.
3. Fractional shares: US platforms widely support fractional share purchases, enabling precise index replication even at lower asset levels.

Why the UK Context Is Different

The UK's investment cost structure does not replicate the conditions that make US direct indexing so attractive.

Stamp Duty Reserve Tax

UK stamp duty applies at 0.5% on all purchases of UK-listed shares (SDRT). This applies per transaction. Rebalancing a 500-stock direct index portfolio would trigger 0.5% SDRT on every purchase. Over time, this cost significantly erodes the tax-loss harvesting benefit that makes direct indexing valuable in the US.

For a 500-stock UK equity direct index with quarterly rebalancing, annual stamp duty drag could easily reach 0.2–0.5% of portfolio value — partially offsetting the benefit before any management fee is considered.

Note: SDRT does not apply to ETF purchases on the London Stock Exchange (ETFs are zero-rated for SDRT), which is one reason UK investors' default instrument of choice is the ETF.

CGT Allowance Compression

The UK annual Capital Gains Tax exempt amount has been reduced dramatically: from £12,300 in 2022/23, to £6,000 in 2023/24, to £3,000 in 2024/25 and beyond. With an allowance of only £3,000, the benefit of generating tax losses to offset against gains is significantly reduced compared to either the old UK allowance or the US equivalent.

Tax-loss harvesting remains valuable at scale — a portfolio with many thousands of pounds in capital gains each year will benefit from offsetting losses — but the compounding benefit of the US model is reduced in the UK by the smaller threshold.

No Major UK Direct Indexing Platform

There is no equivalent to Vanguard Personalised Indexing or Fidelity Managed FidFolios operating at scale in the UK as of 2026. Discretionary wealth managers could construct a similar service manually, but the automation, cost efficiency, and tax optimisation algorithms that characterise US direct indexing platforms do not yet exist in a packaged UK product.

When Does Direct Indexing Make Sense for UK Investors?

Despite the structural obstacles, direct indexing concepts are applicable to UK investors in specific circumstances:

Large Concentrated Position with Low CGT Base

An investor holding a large amount of a single UK stock (acquired via SAYE scheme, founder shares, inheritance) with a very low base cost faces a large deferred CGT liability. Direct indexing around this position — buying other index constituents while gradually and tax-efficiently selling the concentrated position — is a rational strategy. This requires bespoke discretionary management rather than a packaged product.

Custom ESG or Thematic Exclusions

An investor who wants to exclude specific companies (say, a pharmaceutical company for personal reasons, or a tech company for employment reasons) more precisely than any off-the-shelf ESG ETF allows can achieve this through a direct equity holding. At scale (£1 million+), a discretionary manager can hold 50–100 large-cap UK or US stocks to replicate an index while applying personalised exclusions.

Scale Threshold

Below approximately £1 million in a single equity sleeve, the transaction costs, administrative complexity, and management fees of direct indexing are unlikely to be justified compared to a 0.07% TER passive ETF. The cost benefit only emerges at scale where the management fee as a proportion of assets is small and the tax-loss harvesting potential is meaningful.

Interactive Brokers: The Closest UK Approximation

Interactive Brokers (IBKR) offers UK investors access to fractional US shares at very low commissions (from $0.005 per share), making low-cost direct equity portfolios more feasible for UK investors who want US large-cap exposure. IBKR does not offer a direct indexing algorithm, but sophisticated self-directed investors can manually implement a concentrated approximation of major US indices.

Practical Alternatives for UK Investors

For most UK investors, the practical alternative to direct indexing is:

1. Core ETF position (0.07–0.12% TER) for broad market exposure.
2. Supplementary individual equity positions to achieve specific exclusions, overweights, or tilts without replacing the entire index.
3. ISA and SIPP wrappers to minimise CGT and income tax on portfolio returns — within these wrappers, the tax-loss harvesting benefit of direct indexing is irrelevant (no UK CGT within an ISA), making passive ETFs the clear winner.

All investments carry the risk of capital loss. Tax treatment depends on individual circumstances and may change. Direct indexing involves a larger number of individual positions and may involve higher costs than pooled fund alternatives. This guide is for information only and does not constitute financial advice.

How Global Investments Can Help

Global Investments offers discretionary portfolio management that can incorporate elements of direct equity ownership for appropriate clients — particularly those managing large concentrated positions, seeking personalised exclusions, or at a scale where bespoke equity management is efficient. We can assess whether a direct indexing approach or a combination of ETF core and supplementary equities best serves your specific situation, and manage the tax implications carefully. Contact us to discuss your portfolio structure.