Is my portfolio well-diversified, or am I too concentrated?
A lot of portfolios look diversified, but aren't. You might own several funds yet still be heavily exposed to the same countries, sectors, or even the same handful of companies — especially large US tech stocks.
What diversification actually means
Diversification is about spreading risk so that no single investment can significantly damage your overall returns. That usually means mixing different regions (US, UK, Europe, emerging markets), different sectors (tech, healthcare, finance, etc.), and different types of assets (shares, bonds, cash). The goal isn't to own more things — it's to avoid everything moving in the same direction at the same time.
The illusion of diversification
Holding multiple funds doesn't automatically make you diversified. If you own several ETFs that all hold the same major companies — Apple, Microsoft, Nvidia, Amazon, Alphabet and Meta — then you're still highly concentrated, even if those holdings appear in different funds. Many popular global ETFs are heavily weighted toward the US. It's easy to end up with a global ETF, a tech ETF, and a few individual US stocks… yet half your portfolio is effectively riding on the same group of companies.
The three types of hidden concentration
- Geographic concentration — Many investors are far more exposed to the US than they realise. Global stock market indices are often around 70% US.
- Sector concentration — Technology dominates modern markets. Even broad portfolios can end up heavily weighted toward tech.
- Factor concentration — Many funds lean toward similar styles (e.g. growth or momentum). When those styles fall out of favour, multiple holdings can drop together.
A simple way to sense-check your portfolio
- Would a drop in US tech hit most of my portfolio?
- Do I see the same companies repeated across funds?
- Do most of my investments move up and down together?
If the answer is yes, you're probably more concentrated than you think.
Key takeaway: True diversification is about how your holdings behave together, not how many different funds you own.
Arken brings all your holdings together and shows your true exposure across companies, sectors and regions, so you can spot hidden overlap and concentration at a glance.
