Concern about 10% SP drop

Yesterday's drop in SP without any untoward ann is very concerning.
15th Oct- At the AGM, all seemed well. Chairman and CEO did not mention anything about CEO standing down. No question was asked by SH.
24th Oct- By "mutual agreement", CEO stands down.
29th Oct- SP drops by 10%. No ann.
It seems there is more to it than what is being said.
IMO, yesterday was way oversold. But the concern is, will there be more of this?