Recruiter SThree is one today's best performing mid-cap stocks at the end of a busy week for the sector. Robert Walters today said it saw net fee income slump by 29% in the third quarter but reports some improvements, especially in banking and in Asia, though visibility overall remains limited. Similar trends were reported earlier in the week by fellow recruitment groups Hays and Michael Page.Sports Direct is lower in sympathy with fellow sports shop chain JJB Sports, which falls after confirming reports that it is to raise £100m through an equity issue.FTSE 250 - RisersBodycote (BOY) 175.40p +5.03%ARM Holdings (ARM) 152.20p +3.75%Imagination Technologies (IMG) 186.00p +3.74%Moneysupermarket.com (MONY) 77.95p +2.57%SThree (STHR) 261.50p +2.43%Tate & Lyle (TATE) 430.80p +2.18%Britvic (BVIC) 385.50p +2.15%Restaurant Group (RTN) 193.90p +2.05%Provident Financial (PFG) 946.00p +1.94%Morgan Sindall (MGNS) 615.50p +1.82%FTSE 250 - FallersSports Direct International (SPD) 101.00p -4.63%Barratt Developments (BDEV) 255.30p -4.31%Renishaw (RSW) 560.50p -4.27%Computacenter (CCC) 326.30p -3.66%Ecofin Water & Power Opportunities (ECWO) 145.50p -3.64%Carillion (CLLN) 287.70p -3.55%Enterprise Inns (ETI) 124.50p -3.49%Redrow (RDW) 209.20p -3.33%Big Yellow Group (BYG) 406.00p -3.10%Kier Group (KIE) 1,042.00p -2.80%