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A miserable week for US banks has been a boon for the shares of the nation’s biggest technology companies as traders flock toward their cash-rich balance sheets amid concerns about contagion in the financial sector. More than $560 billion in market value has been added to the four biggest US technology and internet companies this week. Microsoft Corp. advanced more than 12%, its biggest weekly jump since April 2015, and it closed at its highest since August. The week’s advance also brought...

Companies tied to artificial intelligence services recorded some of their highest trading volumes on record this month, amid a frenzy of interest in the ChatGPT tool, which generates conversation-style interactions. BuzzFeed Inc., C3.ai Inc., SoundHound AI Inc., and BigBear.ai Holdings Inc. are among the stocks that have all seen massive jumps in volume, along with dizzying swings in their share prices. BigBear.ai soared nearly 65% on Monday, with trading volume that was more than 2,100% of...

Getty Images One of the hottest segments of the exchange-traded funds industry in 2018 involves a technology that is extremely new, often misunderstood and has yet to be utilized or developed in widespread fashion. Blockchain, the technology that is best known as what underpins bitcoin and other cryptocurrencies, has become one of the hottest buzz words on Wall Street. Just as companies that added crypto-related terms to their names saw massive short-term boosts to their share price last year...

Shares of financial companies fell on Friday, with losses accelerating in midday trading despite some better-than-expected quarterly results after the stocks failed to hold above a key technical level. JPMorgan Chase & Co. JPM, -2.71% fell 2.6%, erasing an early gain. The stock, a Dow component, closed above its 50-day moving average on Thursday, the first time it had done so since March 21. That level is widely used as a gauge of an asset price's short-term momentum. While it briefly traded...