Québecor was founded in 1950 by Pierre Péladeau as a newspaper company in Montreal, Quebec. Péladeau launched the tabloid newspaper Journal de Montreal in 1964, which became one of Canada's most-read French-language newspapers. He built Québecor into a major media conglomerate through acquisitions of newspapers, printing companies, and television stations throughout the 1960s, 1970s, and 1980s.
Pierre Péladeau expanded Québecor internationally in the 1980s and 1990s, acquiring printing operations in the United States and Europe. The company became one of the world's largest commercial printing companies at its peak.
Québecor entered the telecommunications business in 1997 when it acquired Vidéotron, a major Quebec cable television and internet provider. This acquisition transformed Québecor from a media company into a diversified telecommunications and media conglomerate.
Pierre Péladeau died in 1997, and his son Pierre Karl Péladeau took over leadership of the company. Under Pierre Karl Péladeau, Québecor expanded its telecommunications operations and launched Vidéotron's wireless service in 2010, becoming a fourth wireless carrier in Quebec.
Québecor sold its international printing operations in the 2000s to focus on its Canadian telecommunications and media businesses. The company launched TVA, a major French-language television network, and expanded its digital media properties.
In 2023, Québecor acquired Freedom Mobile from Shaw Communications for $2.85 billion as a condition of the Rogers-Shaw merger. This acquisition gave Québecor a national wireless network and established it as a fourth national wireless carrier in Canada, competing with Rogers, Bell, and Telus.
For fiscal year 2024, Québecor reported revenue of approximately CAD 5.5 billion.