I'm not familiar with US legislation regarding this, but our (german) laws regulating publicly traded companies would cause a lot of trouble for both Icahn and Icahn Enterprises.
I wonder what he was thinking while typing up that double digit billion dollar tweet. And now I wonder what his accountants and lawyers are thinking.
While he was CEO of Sun, Jonathan Schwartz got an SEC clarification that blogging is OK under Reg FD, so I guess Tweeting is also allowed. I wonder if Bloomberg syndicates Icahn's tweets now.
This may be what you are referencing, but Bloomberg terminals began carrying tweets from selected financial figures and organizations earlier this year:
I wonder what he was thinking while typing up that double digit billion dollar tweet. And now I wonder what his accountants and lawyers are thinking.