At President Donald Trump’s second inauguration, the ceremony saw the president-elect wreathed by billionaire tech CEOs including Apple’s Tim Cook, Google’s Sundar Pichai, Meta’s Mark Zuckerberg, Tesla’s Elon Musk, and Amazon’s Jeff Bezos. The effect was similar to that of Big Tech’s 2016 pilgrimage to Trump Tower after the president’s first victory, when platform CEOs performed the usual ingratiating rituals expected of an incoming president.

But since January, the tech giants have found themselves under mounting pressure, partially due to the president’s notoriously mercurial nature but also because of litigation begun in his first term. While Musk’s dramatic fallout with Trump has gotten the most media attention, major tech players including Google, Apple, and Meta are facing serious antitrust challenges from the administration.

Here’s a rundown of the major legal battles that Big Tech is currently embroiled in and what might come of them.