ii Index: Q2 2025

Our latest ii Index reveals how our very own investors are navigating today’s market. Discover the key trends and insights.

Hands holding a mobile device, with words "ii index" in a roundel

Important information: As investment values can go down as well as up, you may not get back all the money you invest. Currency changes affect international investments, and this can decrease their value in sterling. If you’re unsure if an investment account is right for you, please speak to an authorised financial adviser. Tax treatment depends on your individual circumstances and may be subject to change in the future. Please note images displayed are for illustrative purposes only.

Age analysis performance chart ii index 2025

What is the ii Index?

interactive investor has published its latest instalment of the ii Index, providing data and insights on how the everyday retail investor is performing and positioning their portfolios in this ever-changing market. The ii Index covers all accounts across ISA, Trading Account, and SIPP.

The latest iteration tracks 5 years and 6 months of data, which shows that the average ii investor has seen their portfolio grow by 33.1% — beating the aggregated performance of funds in the IA Mixed Investment 40-85% Shares sector (27.3%). 

The sector can be a useful comparator for private investor portfolios, given its mix of bonds, cash, and equities.

Key findings from Q2 2025

We’ve put together the key findings from our research here. To dig deeper, download the report PDF below.

Jump to...

Camilla Esmund, Senior Manager, Public Relations at interactive investor

ii investors weathered ‘geopolitical storms and market uncertainty’

“We’ve seen impressive ii investor performance. Not only over the last quarter, but also the last five years. Market volatility is part and parcel in investing in the markets, which is why it’s important to diversify and have a long-term investment horizon.

“The last few months are case-in-point, particularly in April after the so-called ‘liberation day’ across the pond and the impact of the ‘Trump tariffs.’ But we can see that this hasn’t deterred investors.

“In fact, this same period of volatility also saw our busiest ever trading day on 7 April, with more purchases than sells. Our investors kept calm and carried on, and some took this as an opportunity to bolster their portfolios.

“This is a consistent trend; in fact, our investors are a great case study in getting the fundamentals of investing right – helping to weather geopolitical storms and market uncertainty without panic-selling.”

Camilla Esmund, Senior PR Manager

Consistent strong performance

Esmund comments: “Investors across all of our age groups outperformed the IA Mixed Investment 40-85% Shares sector over the five-and-a-half-year period, but those aged 35-44 have performed the best over the longest timeframe.

“The not-so-secret to the strong performance? Diversification – as we can see that on average they have balanced portfolios but with the most weighting towards funds (30%), followed by equities (27%), and then ETPs (largely comprised of ETFs or Exchange Traded Funds).”

ii index age analysis chart, age groups performance over time

ETFs top pick for strongest performers

ETFs continue their steady growth in popularity on the ii platform, with those aged 25-34 putting the most money into them at 20%.

This is closely followed by the strongest performing age group, the 35-44s, who allocate 19% of their portfolios to them. Older investors, however, allocate 6% of their portfolios to these types of funds.

ii index chart, portfolio breakdown across ages

Cash alternatives offer stability in shaky markets

The Royal London Short Term Money Market fund has entered the top holdings lists strongly this quarter, likely due to the period of market volatility which stemmed from the start of Trump’s tariffs back in April.

The fund now appears in every top 10 list apart from those aged 25-34 and 65+. On a similar vein, other cash alternatives also entered strongly in the top holdings lists, with the T26 gilt featuring in every top 10 list apart from those 18-24 and 65+.

Young man in pattered shirt, smiling whilst looking at mobile. A shield with a "£" sign floats on his left.

Strong performance for both men and women

Camilla Esmund, Senior PR Manager, adds: “Once again, strong performance from both men and women on ii, and very similar portfolios. 

“Small differences from a portfolio perspective is that women have a higher weighting to investment trusts (20% versus 16% for men), along with funds (27% versus 26%).

“Men, however, tend to favour direct equities (34% versus 31% for women). We can also see a slightly higher allocation to ETFs (11% versus 10%) and bonds (4% versus 3%). But the differences are minimal.”

ii index chart, portfolio breakdown across genders

Introducing Investor Focus

In this new section of the ii Index, interactive investor fund experts do a deep-dive on retail investment trends and what to watch. 

ii Research Team covers fixed income and emerging Asian markets.

Generic investment chart on a screen

Read more original research and reporting

boat icon retire

ii SIPP Index

The ii SIPP Index reveals how interactive investor SIPP pension savers invest during their working life and in retirement.

Icon of pen writing

Great British Retirement Survey

One of the largest retirement surveys of its kind, with research conducted for ii by Opinium Research between May – July 2023

Eye icon

2025 Investment Outlook

Our experts analyse the major talking points for investors and share their investment ideas for the future.

Headshot of PR Manager Saffron Wainwright

Get in touch

If you would like to speak to one of our spokespeople or if you would like bespoke content from our expert writers, please contact:

Saffron Wainwright 
PR Manager
Email: saffron.wainwright@ii.co.uk