Pro tip: your stock can't go down if you crash the stock exchange

It honestly did not occur to me. In all seriousness, was stock exchange ever really hacked ( not just data exfiltration -- write access to everything )?

Trading has been halted on stock exchanges due to technical issues many times. But there's are also more than one stock exchange.

"Tell me, Mr. Anderson, what good is a phone call when you are unable to speak?"