Mega-deals roared back in 2025, with a record 68 transactions topping 10 billion as Wall Street dealmakers piled into blockbuster mergers, pushing global M&A volume to its biggest year since the pandemic and signaling renewed confidence in corporate boardrooms.The number of mega-deals announced globally this year marks the most on record going back to 1980, driving the average deal size to nearly 227 million as companies rushed to lock up assets amid a friendlier regulatory climate and fading fears over P ...