Home bias is holding more of your own country's shares than its share of the world's markets would suggest — and the UK is only a few percent of the global total by value. UK investors have their reasons: the names are familiar, the UK market has long offered a higher dividend yield than many others, and there's no exchange rate to think about. Your geographic weighting is simply how your money splits by where companies are listed or earn their money.
The currency part cuts both ways. Buying overseas shares adds currency exposure: if the pound strengthens, your US holdings are worth less in pounds even when their share prices haven't moved. But staying at home isn't currency-neutral either, because many large UK-listed companies earn most of their money abroad. The app converts every holding into your portfolio currency, and a Pie Chart of your stock portfolio sliced by currency shows where that exposure sits.
The share price didn't move. The exchange rate did.
Educational content only. It is not personal financial advice.