(Sharecast News) - London's FTSE 250 was up 1.7% at 19,196.46 in afternoon trade on Friday.
Darktrace was the top riser on the index, having tumbled on Thursday after tech investment firm Thoma Bravo said it would not be making an offer for the cybersecurity group.
Bridgepoint shares slid after the FTSE Russell said it had decided not to increase the weighing of its shares in its indices. Shares in Bridgepoint had rallied last week in anticipation of index inclusion.
IT services firm Computacenter was also down after it backed its expectations for the year but posted a drop in interim profit. In the six months to 30 June, pre-tax profit fell 6.4% to £107.8m, while revenues rose 16.6% to £2.8m.
FTSE 250 - Risers
Darktrace (DARK) 379.90p 12.70%
National Express Group (NEX) 181.50p 9.27%
Ferrexpo (FXPO) 156.60p 7.48%
Hochschild Mining (HOC) 63.75p 6.61%
Baltic Classifieds Group (BCG) 143.80p 6.52%
Petrofac Ltd. (PFC) 118.70p 5.70%
TI Fluid Systems (TIFS) 150.20p 5.63%
4Imprint Group (FOUR) 3,725.00p 5.37%
Liontrust Asset Management (LIO) 870.00p 5.20%
TP Icap Group (TCAP) 171.30p 5.09%
FTSE 250 - Fallers
Bridgepoint Group (Reg S) (BPT) 258.60p -14.77%
Computacenter (CCC) 2,174.00p -11.77%
Vistry Group (VTY) 804.50p -1.95%
Bytes Technology Group (BYIT) 431.60p -1.91%
Telecom Plus (TEP) 1,792.00p -1.32%
Chrysalis Investments Limited NPV (CHRY) 72.50p -1.09%
Greencoat UK Wind (UKW) 163.60p -0.73%
Vietnam Enterprise Investments (DI) (VEIL) 684.00p -0.73%
Babcock International Group (BAB) 321.80p -0.37%
QinetiQ Group (QQ.) 336.20p -0.24%