It's shaping up to be a rough end to the week for stocks-and one sector is particularly feeling the pain.

Futures tracking the tech-heavy Nasdaq 100 gauge dropped 1.2% ahead of the opening bell, outpacing losses for contracts tied to the large-cap S&P 500 and blue-chip Dow.

iPhone maker Apple, software developer Microsoft, chip designer Nvidia, e-commerce platform Amazon.com, Google parent Alphabet, Facebook owner Meta Platforms, and electric vehicle manufacturer Tesla all traded in the red.