The impressive poaching of Reuters' chief executive by Euromoney Institutional Investor sent shares in the business publisher higher on Thursday.Andrew Rashbass will leave Reuters to become executive chairman of Euromoney, which is 70% owned by the Daily Mail & General Trust, after longstanding chief Richard Ensor decided to step down.Vedanta Resources, which earlier this week stepped up its fight against a $3.3bn tax charge in India, was one of the highest risers ahead of an expected production update on Friday. Standard & Poors lowered its credit rating on Vedanta debt to 'BB-' from 'BB' with outlook negative earlier in the week.Likewise, thanks to a mix of short position closures and sector optimism, emerging markets fund manager Ashmore was up ahead with a trading statement due on Monday, Jupiter Fund Management was rising in advance of its update on Wednesday, and Hargreaves Lansdown ahead of its quarterly results next Thursday.Poundland Group was a big faller after the UK competition regulator threatened to reject the discount retailer's proposed acquisition of rival 99p Stores Limited. The Competition and Markets Authority (CMA) said it would investigate the deal unless certain undertakings were accepted.FTSE 250 - RisersEuromoney Institutional Investor (ERM) 1,190.00p +4.94%Just Retirement Group (JRG) 175.30p +4.04%Vedanta Resources (VED) 538.56p +4.07%Premier Oil (PMO) 155.40p +4.02%Ashmore Group (ASHM) 311.70p +3.87%Bovis Homes Group (BVS) 988.00p +3.51%Jupiter Fund Management (JUP) 421.90p +3.51%Smith (DS) (SMDS) 370.40p +3.41%Fidelity China Special Situations (FCSS) 164.00p +3.40%Redrow (RDW) 374.20p +3.03%FTSE 250 - FallersPoundland Group (PLND) 347.90p -3.63%Serco Group (SRP) 142.90p -3.38%RPS Group (RPS) 236.90p -3.27%NMC Health (NMC) 676.50p -2.73%Rotork (ROR) 2,560.00p -2.29%Countrywide (CWD) 523.50p -2.15%AO World (AO.) 186.20p -2.00%Debenhams (DEB) 76.75p -1.73%Dechra Pharmaceuticals (DPH) 1,014.00p -1.65%Ultra Electronics Holdings (ULE) 1,695.00p -1.63%