Teradyne

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US stock indexes dived about 1% on Wednesday. Photograph: Michael Nagle/Bloomberg

On Wednesday European shares had their worst day since June as concerns around rising debt yields gripped equity markets worldwide, while tech stocks (...)

Social network giant Facebook lost more than half its value in the months after its May 2012 IPO as investors questioned its growth prospects. (Photograph: Justin Sullivan/Getty Images)

Facebook will join the benchmark Standard and Poor’s 500 Index next week, cementing the social-networking company’s recovery from the turbulence that (...)