luminar technologies inc on tuesday said it plans to buy back at least 250 million in common stock the orlando fla autonomousvehicle sensor and lidar technology company said it expects to begin repurchases after the market opens tuesday adding that will use proceeds from a proposed private financing to fund the buyback luminar which has nearly 260 million shares outstanding sports a market capitalization of roughly 55 billion based on mondays closing price of 1467 luminar also said certain board members and executives led by founder and chief executive austin russell plan to buy shares in the open market or as part of prearranged stocktrading plans shares of luminar rose about 7 in premarket trading tuesday