Sept. 15 (UPI) -- Shares of Google 's parent company Alphabet soared on Monday, pushing the tech conglomerate's market capitalization past the $3 trillion mark for the first time. The development puts the search engine giant among a handful of other tech companies that have reached the milestone, which include Apple and Microsoft, as well as AI chipmaker Nvidia. Shares of Alphabet were up by more than 4% and were hovering at around $250 as of Monday afternoon. The company's all-time high