From another thread and to me it makes sense...let's use Alexion to show that there is no 'fundamental' valuation method for biotech...
Did you think we’d see $136 a month ago? Did you think we’d turn down $120 a share a month ago? Heavy investors are still buying in the $130’s…they’re not buying in to be sold at $140. If $120 was ‘substantially undervalued’ in TC’s mind $140 is not ‘accurately valued’. There are many different ways to do company valuations especially in biotech which has less to do with current revenue models but prospective models. Biotech like the tech industry is the second coming of the gold rush…it’s all based on speculation. Does Alexion’s mkt cap make any sense based on their revenue when using traditional valuations when compared to that of Onyx? Of course not. We’ve all read the same reports that say Amgen’s $120 was an "over bid" and conversely we’ve read that ONXX could fetch as much as $180-$200. Since it’s all over the place I would say that noting is out of question at this point, and futher tells you that there is not 'fundamental' valuations method in place.
My thinking is a 16% increase from the Amgen offer of $120, that TC scoffed at, is not going to get it done so scratch $140 off the board. If $140 is not going to get it done let’s bump it up to $150 a share which is a 25% increase from Amgen’s $120 a share. So let’s say that TC thought that Amgen’s offer was 25% undervalued, which I believe would be the minimum percentage break point for being called "significantly undervalued". That brings the fair market value, in TC’s mind to $150. Add in multiple bidders and you can throw on another 10% premium due to up bids. That is how I come to $165 and that is why Pfizer walked away...they wouldn't walk away if the bids where in the ballpark of $135. They had to know the bidding was going to start at a minimum of $135...
Lastly my advice is to stop looking at what the share price is doing now as that has zero effect on what a deal price will be. Pfizer was rumored to be out and cowards sold off...that's it. There is no less than four remaining and probably a few the talking heads have no idea about so my guess there are at least 7 interested companies. The press, especially blogs like MF and SA are notoriously wrong in these situations so I would say believe half of what you see and none of what you read...