Links a link - I like they way Yahoo lays things out
What it shows is that Pfizer hasn't recovered from the crash (not uncommon) and that they are not on track to recover to that level either, if you look at their daily trading they are just bumping along at about the same. The reason their stocks are sitting flat is because they are on a downward slide of consistent profit loss. They also sold out twice the number of shares to keep their profit if you look closely.
January 2010 the stock was $18.66, it is now $30.50. That is pretty good. Since the ACA the stock has done very well.
And in July 2000 it was worth $43. They never really gained value from 2000 to the crash itself, and then they have had a bad recovery that's stabilized flat - in addition to selling off some 30k more shares which dilutes their value. At this point in time, it's a non-invest regardless of minor day to day upticks. When the ACA subsidies are pulled they are going to show further losses, this is a dud stock. They'll have to sell more shares and dilute further in order to not show losses next year, etc.
OR they can cut 50+% off their labor and taxes from headquartering in the US and cross their fingers that they do not take another loss. Which is what they decided to do and I can't say as I blame them; the corporate tax rate in Ireland is 12.50% (average is 29.56% over the last 30 years so it's stable at lower than the US's 39%)