The FTSE Small Caps index is down 0.1 percent by around midday, outpeforming bigger declines of 0.8 percent on the blue-chip FTSE 100 (FTSE: ^FTSE - news) and 0.6 percent on the FTSE 250 (FTSE: ^FTMC - news) mid-cap index.
E-commerce and consumer technology company Expansys slumps 35.4 percent after the company issues a profit warning, stating that trading in the second-half of the year has been below its expectations.
"We remain negative on the shares as we believe APR's business profile is less attractive than peer Aggreko (LSE: AGK.L - news) , our preferred play in this sector," Cantor Fitzgerald analyst Caroline de La Soujeole writes in a research note.
ServicePower rises 6.7 percent after stating it has made a positive start to 2013, despite posting a pre-tax loss of 1.8 million pounds ($2.7 million) for 2012.
"During the past 12 months, the group has significantly expanded its operational platform, product offering and contract base," Finncap analyst Mark Paddon writes in a research note.
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($1 = 0.6608 British pounds)