I agree with this - I think there is a way to trade pre-market ratings changes shown on Briefing, even though we see them after the the big money has been given the heads up. Just don't trade an upgrade on ebay by Bill & Bob Securities from Des Moines. Now an upgrade by Merrill on a mid cap stock?
I've been spending tons of time on this subject, looking at such things as acceptable/non-acceptable gaps, entry/exit stops/targets etc. Anyone want to get more specific?