He called this correctly in 2021, before it burst: https://www.livewiremarkets.com/wires/grantham-this-is-a-bub...
He feels there is still farther to fall (and I agree with him there): https://www.msn.com/en-us/money/markets/prepare-for-an-epic-...
Falling stock prices are really a reflection of real-world problems - while it obviously feels in the US like everything is fine (judging from the many comments saying this here on this thread), everything is not fine, companies looking at their P/L and laying off staff are not fine, and the Fed is deliberately going to cause a recession and cause unemployment to stop inflation, which is a very brutal and indirect tool to do so.
This will not be a soft landing.