Wall Street futures shoot up

(Reuters) - Stock futures pointed to a rebound on Friday after sharp losses in the previous session. Dow Jones futures were up 3.9 percent, S&P 500 futures were up 4.5 percent and Nasdaq futures were up 3.9 percent at 5:03 a.m. EST.

Highlights:

* Investors focus on Citigroup Inc , which lost a quarter of its market value on Thursday on worries about its prospects. The bank's Frankfurt-listed shares rose 3 percent to 4.47 euros 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 , whose shares jumped 4.5 percent after Thursday's closing bell on the back of a better-than-expected quarterly profit.

* S&P 500 <.SPX> constituents due to report quarterly results: food company H.J. Heinz Co and peanut butter and jelly maker J. M. Smucker Co .

* 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.

(Reporting by Peter Starck; editing by Simon Jessop)