Lots of speculations here now!
SIAF will not give away shares in this distribution.
It is TRW that pay shareholders in SIAF, in shares, as TRW gets a deduction of their payables to SIAF.
Nothing else.
To get the distribution you must have shares booked on your account on Wednesday, October 31.
You can buy shares tomorrow, but probably not on Tuesday.
In a normal situation you should be able to sell on Thursday, but I recommend keeping your shares until you get some kind of statement fromTRW/SIAF or Broadridge of your part of the distribution.