I am a shareholder (of Airbus, I'd never hold Boeing). As a shareholder, I don't want to be dubed by a pump and dump orchastrated by a CEO to appear like a genius, get a nice payout and jump ship before the stock tanks, and I am left holding a now vastly depreciated share.
Unless you are friends with the top execs you won't ever know when to buy and sell and in any case I am not into trading.