Pfizer CEO Albert Bourla reportedly is planning to meet with Starboard Value after the activist investor took a $1 billion stake in the struggling drugmaker.

Pfizer Inc.’s stock dipped 2.5% Thursday after two of its former executives said they would not support an effort by activist shareholder Starboard Value to orchestrate a turnaround. “We have decided not to be involved in the efforts of Starboard Value regarding Pfizer,

Pfizer chief executive Albert Bourla plans to meet Starboard Value, said people familiar with the matter, as the activist investor’s $1bn stake in the pharmaceutical group puts pressure on its board to revive its share price.