The Globe and Mail reports in its Tuesday edition that as Big Tech kicks off its quarterly earnings season this week, the industry's bellwether companies have been thrust into uncertainty and turmoil that they did not expect when U.S. President Donald Trump re-entered the White House nearly 100 days ago. An Associated Press dispatch to The Globe says that since Mr. Trump's Jan. 20 inauguration, Big Tech stocks have lost trillions of dollars in value amid an onslaught of tariffs and other uncertainties. It is not exactly what Apple's Tim Cook, Tesla's Elon Musk, Google's Sundar Pichai, Facebook's Mark Zuckerberg and Amazon's Jeff Bezos hoped for when they assembled behind Mr. Trump as he was sworn in. But the Trump administration's policies so far have vexed Big Tech's Magnificent Seven companies. Since Mr. Trump's inauguration, the Magnificent Seven's combined market value has plunged by $3.8-trillion (U.S.), or 22 per cent, as of Sunday. The financial damage was even more severe a few days after Mr. Trump's April 2 unveiling of sweeping tariffs that would have exacted a heavy toll on Big Tech's supply chains in China and other key markets around the globe. Tesla kicks off the first-quarter earnings season today.