Nvidia stock (NVDA) fell on Tuesday after the investment firm run by famed "Big Short" investor Michael Burry disclosed short bets on the chip designer's stock, and as tech stocks broadly pulled back. Nvidia shares had risen a day earlier after analysts boosted their price targets on the artificial intelligence industry leader. The company last week became the first to reach $5 trillion in market capitalization. Is Nvidia stock a buy or sell now? Burry's Scion Asset Management on Monday disclosed it had purchased put options amounting to a notional value of $187 million of Nvidia stock as of Sept. 30. The investment firm's quarterly 13F filing with the Securities and Exchange Commission also revealed it purchased put options against Palantir (PLTR) with a notional value of $912 million. Burry, who shot to fame for his bet against the housing market in 2008, recently posted messages on X, formerly Twitter, that suggested he is concerned about a market bubble and deals in the AI space. On Monday, Loop Capital increased its Nvidia price target to 350 from 250 while keeping its buy rating. Nvidia appears on course to double its shipments of graphics processing units in the next 12 to 15 months, analyst Ananda Baruah said. Meanwhile, Rosenblatt Securities raised its price target to 240 from 215 and reiterated its buy rating ahead of Nvidia's third-quarter earnings report on Nov. 19. Last week, Goldman Sachs increased its price target to 240 from 210 and maintained its buy rating.