JNJ—The sell-off stems from two related issues: a) the potential legal liability; and b) damage to the JNJ brand, which is (still) one of the most highly-valued consumer brands in the world. I don't have an estimate for the magnitude of b), but it's reasonable, IMO, to guess that it could be larger than a).
“The efficient-market hypothesis may be
the foremost piece of B.S. ever promulgated
in any area of human knowledge!”