Twitter Inc. shares soared 12.5% Wednesday in afternoon trade Wednesday, after falling as much as 7.2% to a record low earlier in the session. The shares rose amid speculation that News Corp. , the parent of MarketWatch, had bought a stake in Twitter, said James Cakmak, an analyst at Monness Crespi Hardt. "No idea if true or not but that's the chatter right now," Cakmak wrote in an email. News Corp. did not immediately respond to a request to comment. Volume as of 2 p.m. ET was 46 million shares, more than double the full-day average of 19.8 million shares, according to FactSet
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