While Pfizer has made a number of acquisitions, its biggest bet is on Seagen. Pfizer wants this to be a transformative acquisition, and it projects Seagen to contribute $10 billion in sales by 2030.

Pfizer shares have gained ground since a report over the weekend said that activist investor Starboard Value has taken a roughly $1 billion stake in the drug maker and is pushing for changes. Monitor ...

Pfizer's stock has struggled due to declining demand for COVID-19 treatments, but activist investor Starboard's $1 billion ...

With one headline, Pfizer had gone from being a well-known hunter — spending heavily to buy rivals — to the hunted.