That was the day before.
Yes (almost) 45% of the total volume.
I just checked on another "irrational" stock that had more than 60% of the volume in short sales though. On no news, of course.
Just some big idiot (or group of idiots) attempting to manipulate the market.
I decided to check because todays action was irrational. That usually indicates excessive shorting. I've got a smallish holding here, but suspect every available share will have been loaned. Ought to provide a tidy borrow fee to add to the dividend.