The Globe and Mail reports in its Tuesday edition that Alphabet's shares rose nearly 6 per cent to a record high on Monday after Berkshire Hathaway disclosed an interest in the tech giant. A Reuters dispatch to The Globe reports that the purchase of 17.85 million Alphabet shares -- worth about $4.93-billion (U.S.) as of close on Friday -- is one of the final major investments by Berkshire under Warren Buffett and marks a rare foray into the industry by tech-averse conglomerate. Mr. Buffett has long compared Apple, Berkshire's largest holding, to a consumer products company. Interactive Brokers analyst Steve Sosnick says, "The stake purchase of a tech company may represent a different type of mentality at Berkshire, though it's not a total departure from its value-investing model." The vote of confidence comes as broader sentiment on tech has turned cautious, with several business leaders and experts warning that the artificial intelligence frenzy driving up tech stock prices has detached valuations from fundamentals and that returns from hundreds of billions in data-centre spending remain uncertain. Still, Alphabet has been an outlier. It is the best-performing "Magnificent Seven" member with a 46-per-cent gain.