Activist investor Starboard met with Pfizer last week. Here's what went down, according to the hedge fund's cofounder and CEO Jeff Smith.

Starboard has a $1 billion stake in Pfizer and an unknown but "sizable" stake in Kenvue, according to earlier media reports.

Pfizer (PFE) faces renewed calls for change as Jeffrey Smith, CEO of Starboard Value makes his case for his activist stance on the pharma giant. Read more here.

The U.S. Food and Drug Administration on Tuesday approved Pfizer's RSV vaccine for the prevention of lower respiratory tract disease caused by RSV in adults aged 18 to 59 at increased risk of the disease.

Approval of Pfizer's Abrysvo in certain adults aged 18 to 59 years old will substantially expand the number of people eligible for vaccination with the shot.

Abrysvo is the first vaccine for the respiratory syncytial virus that is indicated for adults younger than 50, the drugmaker said.