UBS has found a majority of investors remain optimistic about their own region’s economy (67 percent) and the stock market (63 percent) over the next 12 months, but are increasingly concerned about tax increases, climate change and their country’s politics.

The new Investor Sentiment survey polled 3,004 investors and 1,202 business owners across 15 markets globally, and found overall market optimism has dipped slightly.

Business owners remain confident in their own businesses over the next 12 months, despite acknowledging that in the last six months the vast majori...