How to Choose SIPP Investments in 2026

The hardest part of opening a SIPP is rarely the application. It is the moment the platform presents thousands of investments and asks what you want to buy.

I assess time horizon, risk capacity, asset allocation and investment vehicle before comparing providers. Starting with a fashionable fund or familiar provider can lead the decision away from what the portfolio needs.

What can you hold in a SIPP?

A mainstream SIPP can usually hold funds, ETFs, UK and overseas shares, investment trusts, bonds and gilts, although the exact range varies sharply by provider. Vanguard restricts its platform to Vanguard funds and ETFs, while AJ Bell, Hargreaves Lansdown, Interactive Investor and Fidelity offer broad third-party ranges.

Investment availability is a long-term constraint. A restricted platform can remove noise today, but a later change in strategy may require a provider transfer.

Funds, ETFs, shares and investment trusts

Funds or ETFs can form the core of a diversified portfolio because one holding can spread money across hundreds or thousands of securities. An open-ended fund trades once daily, while an ETF trades on an exchange and can have dealing costs and a bid-offer spread.

Individual shares provide direct ownership and control, but concentration risk rises quickly. Investment trusts can provide specialist exposure and can trade above or below the value of their underlying assets. Bonds and gilts can reduce volatility and support planned withdrawals, although they still carry interest-rate and credit risk.

How many funds do you actually need?

A longer fund list does not automatically create better diversification because one global index fund may already hold several thousand companies. Extra regional funds can duplicate the same largest holdings and make rebalancing harder.

A globally diversified fund can form a complete one-fund portfolio at the right risk level. Two or three funds can separate equities, bonds and a specific tilt, but another holding is worthwhile only when it has a distinct job.

Three portfolio structures to compare

A long-horizon comparison sets a global equity fund against a multi-asset fund that includes bonds. The trade-off is clear: the equity option will normally fluctuate more, while the multi-asset option may be easier to hold through a severe market fall.

A retirement portfolio can hold planned near-term withdrawals in cash or short-duration bonds and invest the remaining balance for longer-term growth. Capacity for loss, other income and withdrawal timing determine the mix.

How provider choice changes the investment decision

The investment approach comes before the platform. Vanguard suits a deliberately narrow Vanguard-only portfolio, whereas investment trusts, overseas shares or funds from several managers require a broader provider.

Fund and ETF portfolios can face different custody costs on the same platform. The provider's classification of each intended holding therefore affects the fee comparison.