* Dow Jones futures DJc1 rose 3.9 percent by 1003 GMT on Friday, S&P 500 futures SPc1 gained 4.5 percent and Nasdaq futures NDc1 were up 3.9 percent -- pointing to a rebound from Thursday's sharp losses. [ID:nN20436742] * Investors focus on Citigroup Inc (C.N: Quote, Profile, Research, Stock Buzz), which lost a quarter of its market value on Thursday on worries about its prospects [ID:nN20470744]. The bank's Frankfurt-listed shares (TRV.F: Quote, Profile, Research, Stock Buzz) rose 3 percent to 4.47 euros by 1003 on Friday, or some 20 percent above the stock's New York close of $4.71. Citi's board of directors is set to meet later on Friday. * Eyes also on computer maker Dell Inc (DELL.O: Quote, Profile, Research, Stock Buzz), whose shares jumped 4.5 percent after Thursday's closing bell on the back of a better-than-expected quarterly profit. [ID:nN20401261] * S&P 500 .SPX constituents due to report quarterly results: food company H.J. Heinz Co (HNZ.N: Quote, Profile, Research, Stock Buzz) and peanut butter and jelly maker J. M. Smucker Co (SJM.N: Quote, Profile, Research, Stock Buzz). * Richmond Fed President Jeffrey Lacker speaks on financial conditions and the economic outlook at 1315 GMT, and Chicago Fed President Charles Evans on the economic outlook at 1740 GMT. For Reuters GLOBAL MARKETS report, see [ID:nLL345383] (Reporting by Peter Starck; editing by Simon Jessop)

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