Telecoms group Vodafone was extending gains made on Thursday on the back of rumours that advisers of US giant AT&T are working on a cash bid worth more than 300p a share, compared with current prices of just over 200p. AT&T ruled out an offer back in January, meaning that it is now free to revisit an approach under UK takeover 'cooling off' rules.The London Stock Exchange was also higher after it reported a boost to profits from a surge in flotations in its first quarter but shares fell as it unveiled details of a £938m rights issue to bankroll its proposed acquisition of US financial index business Frank Russell.Royal Mail was once again rising strongly, having had a rather turbulent week amid concerns about its outlook. Banking groups Lloyds and HSBC were also top performers. Meanwhile, mining groups extended Thursday's losses, with BHP Billiton continuing to fall following Tuesday's underwhelming plans for a demerger. Fresnillo, Anglo American and Rio Tinto were all in the bottom 10 on Friday afternoon. FTSE 100 - RisersRoyal Mail (RMG) 448.30p +1.82%Vodafone Group (VOD) 205.65p +1.51%Reckitt Benckiser Group (RB.) 5,275.00p +1.34%Travis Perkins (TPK) 1,741.00p +1.22%Lloyds Banking Group (LLOY) 76.08p +1.12%Tesco (TSCO) 248.20p +1.10%London Stock Exchange Group (LSE) 2,027.00p +1.10%Hargreaves Lansdown (HL.) 1,144.00p +0.97%HSBC Holdings (HSBA) 647.10p +0.97%Coca-Cola HBC AG (CDI) (CCH) 1,385.00p +0.95%FTSE 100 - FallersBHP Billiton (BLT) 1,941.50p -1.50%Mondi (MNDI) 1,003.00p -1.47%Fresnillo (FRES) 925.00p -1.39%Anglo American (AAL) 1,552.50p -1.33%Rio Tinto (RIO) 3,388.50p -1.30%SSE (SSE) 1,502.00p -1.18%CRH (CRH) 1,386.00p -1.07%Tullow Oil (TLW) 703.50p -0.99%Rolls-Royce Holdings (RR.) 1,028.00p -0.87%Kingfisher (KGF) 304.20p -0.85%NR