WSJ: Pfizer considering buying Global Blood Therapeutics for roughly $5 billion

Shares of Global Blood Therapeutics Inc. jumped 9.5% in trading on Friday after The Wall Street Journal reported that Pfizer Inc. is considering buying the company for about $5 billion. There were media reports earlier this week that Global Blood Therapeutics, which markets a sickle-cell treatment, is attracting takeover interest. The company's stock is up 79.6% this year, while the broader S&P 500 is down 12.8%.

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