GGB, unless you can make a case that there is some mysterious inside info that is material, non-public, and lasts more than 3 years; you can't make any case at all.
It also has to meet the criteria that it would restrict Woodford from trading while not restricting Linda Powers' trading.
Reason for halt? Not material after halt was lifted.
Futility rec? If nwbo doesn't think it is sufficiently material to disclose to shareholders, then it is not sufficiently material to prohibit Woodford from trading.