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Key MilestonesHomeAbout-UsKey Milestones1849

Pfizer opens up in Brooklyn, New York as a fine chemical business

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1942

Pfizer becomes a publicly-traded company in the United States

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1944

Pfizer becomes the world’s largest producer of penicillin

1951

Pfizer Canada opens its doors and establishes its head office in Montreal, Quebec 

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1961

Pfizer establishes new world headquarters in New York City 

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1975

Pfizer Canada's head office moves to Kirkland in the West Island of Montreal 

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1996

Pfizer Canada begins its partnership with the Canadian Paralympic Committee 

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1998

Pfizer Canada becomes founding partner of West Island Community Shares

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1999

Pfizer celebrates its 150th  anniversary

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2000

Pfizer acquires Warner-Lambert 

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2003

Pfizer acquires Pharmacia 

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2008

Pfizer acquires the Canadian subsidiary of Coley Pharmaceutical Group 

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2009

Pfizer acquires Wyeth

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2009

Pfizer partners with GSK to establish ViiV Healthcare specializing in HIV treatments 

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2011

Pfizer acquires King Pharmaceuticals 

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2013

Zoetis, formerly Pfizer animal health division, becomes fully independent 

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2015

Pfizer acquires Hospira 

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2019

Pfizer enters a join venture with GlaxoSmithKline (GSK) to form the largest OTC business, GSK Consumer Healthcare

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2020

Pfizer completes the combination of Upjohn and Mylan to create Viatris, a global generic pharmaceutical company

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2021

Pfizer reveals a new corporate identity to signal a shift towards a future of innovation and science

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