Moonmaker - Out of posts, so I will edit this one.
Yes, he would have to file a statement of material change. Not certain of the timing. My own opinion is he is involved up to his neck in orchestrating the drop, but that's just an opinion with nothing substantiating it beyond his known propensity for shorting and the fact that he wouldn't make any comment about the falling share price when others were going on record, and he had been a vocal bull in the preceding months.
Also, he looks like a sociopath. :)
Activist investor, right.
He could short the $# out of it, and it wouldn't reflect ANY material change in his holdings, but it would swell his coffers.
MB