The U.S. tech sector is facing a significant downturn, with the seven largest companies losing a combined $2.7 trillion in market value over three weeks. The Nasdaq index has dropped to its lowest level since September, reflecting a 4.9% decline for the week, marking its worst performance in six months.Tesla saw the largest percentage drop at 33%, resulting in a $386 billion loss, while Nvidia experienced the largest monetary decrease, losing $577 billion, a 17% decline. Other major firms, including Apple, Microsoft, Amazon, Alphabet, and Meta, reported declines between 9% and 16% in market capitalization.