Wireless telecoms equipment supplier Filtronic has been a regular on the list of top TechMARK performers in the past week and it has risen by nearly one-fifth over the past seven days. There was some selling of Filtronic shares this morning but the buyers returned in the afternoon. Technology developer Qinetiq Group is lower even though its US subsidiary has launched the Spectroil Q100 Oil Analysis Spectrometer, an analytical instrument that detects and quantifies metals in used oils and hydraulic fluids. The instrument can be used to predict potential mechanical failures.FTSE TechMARK - RisersAnite Group (AIE) 45.75p +7.65%Spirent Communications (SPT) 131.80p +5.44%Dialight (DIA) 405.00p +3.85%Wolfson Microelectronics (WLF) 209.00p +2.70%Filtronic (FTC) 40.00p +2.56%BT Group (BT.A) 146.40p +2.38%Torotrak (TRK) 23.25p +2.20%Intec Telecom Systems (ITL) 72.50p +2.11%NCC Group (NCC) 452.00p +1.57%GB Group (GBG) 25.75p +0.97%FTSE TechMARK - FallersPhytopharm (PYM) 8.13p -7.75%BATM Advanced (BVC) 25.00p -6.54%Kewill (KWL) 118.00p -4.07%Kofax (KFX) 244.00p -3.17%Vislink (VLK) 18.75p -2.67%Innovation Group (TIG) 11.50p -2.13%Triad Group (TRD) 25.00p -2.00%QinetiQ Group (QQ.) 120.70p -1.95%Antisoma (ASM) 5.65p -1.74%Psion (PON) 81.75p -1.51%