Think as if you were the shorter

UBS became a major holder of A2M.
CBA is still a major holder.
I think most shorter have closed their short positions and returned the shares to those share lenders.

1. Shorter should be happy with their profit ($2.40-$1.96)/$1.96=44% already,

2 BAL's announcement on Wednesday will be a risk for them as well.
2.1 If BAL announces a serious management issue, then it proves it's an independent issue and A2 should be impacted by that.
2.2 If BAL announces a not too bad clarification, then BAL SP may jump back and so do A2

3 Another risk is the A2's FY17 forecast may come out soon. If A2 releases a optimistic forecast, short squeeze may happen.
So shorter may also prefer to close the short position before the announcement.

If I am a (small) shorter, I probably won't take those risk to try to pursue the limited profit, close short position before the BAL announcement will be safer.

Of course, IMO.
DYOR