Extract the stock ticker from the following text
Pfizer (2021).svg
 Corporate logo since 2021
 Pfizer World Headquarters Entrance.jpg
 Headquarters on 42nd Street in Midtown Manhattan
 Type Public
 Traded as 
 NYSE: PFE
 S&P 100 component
 S&P 500 component
 Industry 
 Pharmaceutical
 Biotechnology
 Founded 1849; 174 years ago in New York City
 Founders 
 Charles Pfizer
 Charles F. Erhart
 Headquarters New York City, U.S.
 Area served Worldwide
 Key people Albert Bourla (CEO)
 Products 
 Pharmaceutical drugsvaccines
 Revenue Increase US$100.3 billion (2022)
 Operating income Increase US$31.40 billion (2022)
 Net income Increase US$31.37 billion (2022)
 Total assets Increase US$197.2 billion (2022)
 Total equity Increase US$95.66 billion (2022)
 Number of employees c.���83,000 (2022)
NYSE: PFE