Wall Street is turning cautious on US stocks, while some experts warn of pain ahead. Here's what JPMorgan, Jeremy Grantham and others have said.

• Investors are turning increasingly wary of what the end of 2023 brings for stocks and the US economy. 
• Wall Street banks including JPMorgan and Bank of America Merrill Lynch are turning more defensive in their investing approach. 
• Here's what six top voices have said about US stocks as 2023 swings toward its final quarter. 

There's a growing sense of caution in the US stock market about the economy as 2023 swings toward its final quarter – and it's fostering a more defensive approach among investors.