Activist Starboard Value has $1 billion Pfizer stake, taps former executives for help, sources say CNBCExclusive | Activist Starboard Value Takes $1 Billion Stake in Pfizer The Wall Street JournalActivist investor Starboard builds $1bn stake in drugmaker Pfizer Financial TimesAmid Pfizer’s Struggles With Declining Demand For COVID-19 Treatments, Activist Investor Starboard Value Invests $1B In Pharma Giant: Report – Pfizer (NYSE:PFE) BenzingaStarboard reportedly takes $1 billion stake in Pfizer, seeks changes MarketWatch