Investors clearly approved of Thomas Cook's move to drop its dividend as it seeks to rebuild its balance sheet, as the share price rose almost 10%. Ferrexpo was heading in the opposite direction after Credit Suisse initiated coverage on the iron ore producer with an "underperform" rating, saying it sees strong growth from the sector but pointing to the strong performance of Ferrexpo's share price lately.It has a 380p target price on the stock. Aquarius Platinum was also on the up after it agreed to submit a revised proposal to meet the Zimbabwean law which dictates that foreign companies sell controlling stakes on local business to black investors. FTSE 250 - RisersThomas Cook Group (TCG) 40.50p +9.73%Aquarius Platinum Ltd. (AQP) 190.70p +5.83%Yule Catto & Co (YULC) 164.10p +4.99%Laird (LRD) 139.60p +2.65%Paragon Group Of Companies (PAG) 156.00p +2.43%SThree (STHR) 230.60p +2.22%Travis Perkins (TPK) 756.00p +2.16%De La Rue (DLAR) 829.00p +2.16%Perform Group (PER) 212.40p +2.12%Pace (PIC) 102.60p +2.09%FTSE 250 - FallersFerrexpo (FXPO) 277.40p -4.34%Rank Group (RNK) 115.00p -4.33%Kenmare Resources (KMR) 36.45p -4.08%Micro Focus International Plc (MCRO) 327.60p -4.07%Hochschild Mining (HOC) 436.50p -3.22%Domino's Pizza UK & IRL (DOM) 443.50p -3.19%Kesa Electricals (KESA) 83.40p -3.19%Debenhams (DEB) 57.15p -3.14%Elementis (ELM) 125.50p -2.94%BTG (BGC) 251.30p -2.82%NR