Short answers, pulled from the story.
Comcast traces its origins to 1963, when Ralph J. Roberts and his two partners, Daniel Aaron and Julian A. Brodsky, purchased American Cable Systems for $500,000. The company was re-incorporated in Pennsylvania under the name Comcast Corporation on the 5th of March 1969.
Comcast became the largest cable television company in the United States on the 18th of November 2002, when it completed its $44.5 billion acquisition of AT&T Broadband, bringing its subscriber count to over 22 million. The deal was announced in 2001 and re-incorporated the merged entity in Pennsylvania on the 7th of December 2001.
Comcast acquired a controlling 51% stake in NBCUniversal on the 28th of January 2011, after the FCC approved the deal by a vote of 4 to 1 on the 18th of January 2011. Comcast then acquired the remaining 49% from General Electric in a deal valued at approximately $16.7 billion, completing that transaction on the 19th of March 2013.
Comcast acquired Sky plc for £17.28 per share, with the total deal valued at approximately $40 billion. The merger was completed on the 7th of November 2018, when Sky was delisted and became a wholly owned subsidiary of Comcast.
The Consumerist awarded Comcast its "Worst Company in America" title in 2010 and again in 2014. The American Customer Satisfaction Index found that Comcast had the lowest customer satisfaction rating of any company or government agency in the country in 2004 and 2007, including ranking below the Internal Revenue Service.
In December 2023, Comcast disclosed that approximately 35.9 million Xfinity accounts were affected by exploitation of a Citrix NetScaler vulnerability known as CitrixBleed (CVE-2023-4966). Exposed data included usernames, encrypted passwords, and for some customers, dates of birth, contact details, and the last four digits of Social Security numbers.