You might sell now if you thought you could get a better return on the money over the next 6 weeks.
Call it 23.75 now. Waiting for the deal to close at 24 gets you another .25.
.25/23.75 is a little over a 1% return in six weeks or so, with almost 100% certainty.
If you have a way of generating more, say 5%, over that period, with "enough" certainty or likelihood, it makes sense to sell ARIA now and move the funds to that other investment.
I think that is easily doable so I sold at 23.76.
If I could afford to buy all of them, I would not need to buy any of them and I sure wouldn't be spending time on the message boards!