Microsoft-Activision Blizzard ($69 Billion, 2023)

Microsoft's $69 billion acquisition of Activision Blizzard faced unprecedented global regulatory scrutiny, with the FTC, UK CMA, and EU authorities all intervening over gaming market concentration. With a price tag 40% less than the AOL-Time Warner merger adjusted for inflation, it became the most scrutinized tech acquisition in decades, ultimately closing only after Microsoft agreed to divest cloud gaming rights to Ubisoft.