Something occurs to me: would it be possible (in terms of navigating the legal hurdles) for companies to hedge against Wall street manipulation by publicly publishing a strategy of share buying/selling at set prices?
e.g. "We at ChamChung believe our company is worth $XBn, which corresponds to a share price of $100/ share. We will therefore automatically buy up our own shares trading under $80/share and sell shares when buyers are offering in excess of $120.
I realise no-one would ever actually do this due to executives usually having vested interests in the Wall Street shenenigans and not wanting to admit when your company is tanking, but would it be a feasible thing to do without being accused of insider trading or somesuch?