June 4 (Reuters) - U.S. stock index futures extended gains on Friday after data showed the U.S. economy added fewer jobs than expected in May, easing concerns about the economy running too hot and causing an early tightening of monetary policy. At 08:36 a.m. ET, Dow E-minis were up 58 points, or 0.17%, S&P 500 E-minis were up 11.25 points, or 0.27%, and Nasdaq 100 E-minis were up 32.5 points, or 0.24%. At 8:26 a.m. ET, Dow e-minis were down 27 points, or 0.08%, S&P 500 e-minis were up 3 points, or 0.07%, and Nasdaq 100 e-minis were up 21 points, or 0.16%. (Reporting by Medha Singh in Bengaluru) Our Standards: The Thomson Reuters Trust Principles.