** Shares of grocery delivery platform Instacart CART.O down ~4% at $43.92 in early trade
** CEO Fidji Simo to step down to join OpenAI as its chief of applications
** Instacart to name new CEO soon, Simo to stay on as Chair to support the transition, she said in an email to employees.
** Simo will start her new job at OpenAI later this year
** Including session moves, stock up ~7% YTD
(Reporting by Neil J Kanatt in Bengaluru)
((Neil.JKanatt@thomsonreuters.com;))