Due diligence plays a significant role in M&A transactions, but the eventual return on investments don’t always add up to the purchase price. While some companies such as Abbvie Inc. and Bristol Myers Squibb Co. – as shown in part one of this three-part series – have succeeded in acquiring products able to surpass M&A sticker prices, the vast majority of deals analyzed by BioWorld showed that most buyers remain significantly in the red.