Yes.
"Good luck going forward. Considering that you could probably single handedly crash bitcoin with what you have in your wallet... Uh... Please don't?"
https://www.coindesk.com/mt-gox-trustee-sells-400-million-bi...
The market was recovering from the crash when this happened, and it went down the toilet again right after that.
Funnily it recovered (to die soon after again), but we have seen the Mt Gox weight in action already.