Irish mining firm Kenmare Resources is the top performer on the FTSE 250 on Monday, rising over 4.5%. Kenmare's shares have had a decent run as of late, rising by nearly 9% in the last week, and by around 60% since mid-January.Meanwhile, trendy fashion firm Supergroup - the index's worst performer - has fallen by over 5%. The share price has continued to fall since mid-May when the company announced that it registered a lower sales growth rate in the three months to 1 May. Shares have dropped by over 40% since 12 May.The London Stock Exchange is edging higher despite Canadian consortium Maple Group launching a C$3.7bn rival cash bid for TMS. In US dollar terms, that values TMX at $3.8bn, Maple said, compared to the LSE's share offer, which is valued at $3.4bn. High street peers JD Sports Fashion and Sports Direct International are also going well.---BCFTSE 250 - RisersKenmare Resources (KMR) 47.78p +4.55%Ashtead Group (AHT) 184.40p +3.25%Redrow (RDW) 121.20p +3.06%Sports Direct International (SPD) 221.80p +2.50%JD Sports Fashion (JD.) 884.50p +2.25%Lamprell (LAM) 382.50p +2.16%RPC Group (RPC) 345.00p +2.13%Invensys (ISYS) 303.20p +1.92%Moneysupermarket.com Group (MONY) 109.00p +1.77%Jardine Lloyd Thompson Group (JLT) 688.50p +1.77%FTSE 250 - FallersSupergroup (SGP) 874.00p -5.21%Premier Foods (PFD) 29.01p -4.35%Shanks Group (SKS) 127.40p -2.67%Exillon Energy (EXI) 422.90p -2.60%Regus (RGU) 105.00p -2.51%Hays (HAS) 106.50p -2.47%Domino's Pizza UK & IRL (DOM) 377.20p -2.46%Ocado Group (OCDO) 219.90p -2.27%F&C Asset Management (FCAM) 76.40p -1.93%Travis Perkins (TPK) 1,021.00p -1.83%