RE: when the big C is selling its time to sellYou don't know for sure if they are selling; they could be buying.
Might not be "them" could be their clients buying/selling.
Could be any one of a dozen posibilities.
IMO not a useful indicator for judging selling points.
Insiders bought, that's useful as a buy signal.
However when they sell you'll know too late so that's not a useful selling signal.
Selling signals are difficult to identify, best have a plan.
Follow the plan.