premarket

adj

1. (not-comparable)Prior to a product's official market release

   “premarket testing”

noun

1. (uncountable)The informal market in stocks and other securities, held before the official markets open

   “Stocks are up in premarket trading this morning.”

   “If you are relatively inexperienced, have little training, and are learning how to play a number of potential situations that can arise during the premarket, I advise you to first remain on the sidelines, to let the real trend emerge before attacking.”