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Best platform for large portfolios

Some fee structures work better those with smaller portfolios, while some benefit larger portfolio-holders. It really pays to know the difference.

check Fact Checked
  • By Clare West
  • Published: May 1, 2024
  • Edited by: Antonia Medlicott
  • Disclosure
  • Last Update: 1 month ago

Did you know we offer a platform matching tool that helps you find your perfect platform match, based on your specific investing needs? You’ll find it here.

Best for £500,000 portfolios


If you want to invest through a stocks and shares ISA, try using our ISA calculator. It’ll find the lowest priced platform for your circumstances.

Best for £1m+ portfolios


Understanding fees


Total fees may comprise of:

  • Service / Annual fees
  • Ongoing fund fees (for funds)
  • Dealing fees

If you are buying stocks that are denominated in another currency from your own, you will also need to pay:

  • Foreign exchange (FX) fees

There may be other costs, such as taxes and levies, that could also be applied, but we haven’t included these are they are applied universally, and don’t change between providers.

What fee structures work best for large portfolios?

Not every provider charges in the same way. Some providers use a flat-fee subscription model, while others charge fees as a percentage of the total value of your investments. Flat-fees tend to favour larger portfolio holders as they don’t increase, no matter how much your portfolio grows.

Not many providers use a fixed fee model, but the following do:

However, in recognition that large portfolio-holders will be paying a high price within percentage models, many percentage-based providers cap fees, which in effect turns those maximum fees into fixed fees. That can also make them good value for large portfolio-holders.

Providers that apply a cap include:

Other platforms offer reductions for large portfolios on their percentage fees.

Extra costs

It’s not just annual fees you need to factor in, however. Some providers offering low annual fees pile the costs on in other areas. As you’ll be able to see from the fee comparison charts, providers with the lowest annual fees often become high-cost providers when FX fees and/or dealing fees are taken into consideration.

So, it’s important to understand all charges that are levied by providers when making a decision on where to invest.

One other thing to bear in mind, is that dealing fees and FX fees are largely avoidable if you don’t trade often. A buy-and-hold strategy can keep those costs off your balance sheet, and has other advantages too. It avoids falling into the trap of trying to time the market, for example, something that has been consistently shown to be less effective than staying in the market over long periods.

If you do plan to trade regularly, it’s worth asking if your provider offers a Regular Investment Plan, where money is automatically drip-fed into your account every month. In return for this commitment, providers will often waive or discount trading charges. Fidelity and AJ Bell offer this, for example.

It’s not all about the fees


Of course, fees aren’t the only consideration when selecting an investment provider.

You’ll also need to think about:

  • If the provider offers the investable assets you want to hold
  • If the provider offers the account type you want to invest in (ISA, Junior ISA, SIPP, general investment account)
  • What customer service is like
  • Whether the platform is too complex for you, designed to suit new investors, or works for a range of experience levels

We’ve assessed all these factors, and more in our full reviews. Simply select the brand name you want to explore from the main website menu.

* Wondering whether we get paid for writing good things about platforms? Good question! It’s how many comparison sites get paid.

The answer is – no, we proudly do things a little differently at Investing Insiders. Our sole criteria is what’s best for you – the consumer. So, although we do receive a commission if you choose to click through and open an account from any of our reviews, we will never bend our opinions to suit the requests of providers, or the needs of our bank balance. Bottom line – what you read on this page is what I’d recommend to my family, friends and colleagues, and indeed, what I choose for my own money.

Find your ideal investment platforms


The best way to discover the lowest fees for your specific portfolio size, is to use our market-leading quick search tool.

From a few short questions, we will highlight those platforms that offer opportunities to lower your fees – and keep more of your returns.

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