Here's how the seven megacaps have fared over that stretch:
Apple, the world's most valuable company and the only remaining member of the $3 trillion club, has lost $529 billion in market cap since the close on Feb. 19. The iPhone maker is down 14%.
Microsoft, which was previously worth more than $3 trillion, has fallen by $267 billion in the past three weeks, a drop of close to 9% for the software giant.
Nvidia, the chipmaker that's been the biggest beneficiary of the artificial intelligence boom, also slid below $3 trillion over the course of losing $577 billion in value, the biggest dollar decline in the group. The stock is down 17% since the Nasdaq peaked.