AbbVie has its final stamp of approval. Abbott Laboratories' ($ABT) directors endorsed the pharma unit's spinoff Wednesday, allowing AbbVie to ring in the new year as an independent company.Abbott shareholders will receive one share of AbbVie's common stock for each Abbott share they own. AbbVie's shares will hit New Year's Day, with trading expected to begin on the New York Stock Exchange when markets reopen Jan. 2. Ticker symbol: ABBV. Story