Instacart and Arm shares fall premarket as all eyes turn to Klaviyo

 Grocery-delivery app Instacart CAR, known officially as Maplebear Inc., fell 4% in premarket trade Wednesday, a day after the stock debuted on Wall Street with a bang, opening 40% above where its initial public offering priced before easing later on — potentially paving the way for more IPOs after a two-year dry spell. Arm Holdings Plc. ARM, fell 1.8%. That stock, which went public last week with some fanfare, has now lost 9% in the week to date as the initial shine seems to be wearing off. The reception from Wall Street analysts hasn’t been very enthusiastic. Of the four analysts surveyed by FactSet, who have already…