LONDON--VIPERA PLC (VIP.LN), a specialist provider of mobile financial software services, Wednesday said it is comfortable that recognized revenues will amount to some 1.4 million pounds ($2.25 million) for the year ended Dec. 31, adding that this will result in a materially improved pre-tax outturn for the year.

Shares at 1200 GMT up 2 pence, or 25%, at 10 pence.

Online derivative trading services provider PLUS500 LTD. (PLUS.LN) said it expects revenue for the full year to be significantly ahead of expectations following strong trading since October 17.

Shares uo 36 pence, or 20%, at 219.5 pence.

Mail and logistics services company UK MAIL GROUP PLC (UKM.LN) lifted its interim dividend payment after reporting a 63% jump in first-half pretax profit, and said trading to date in the second half of the year has been in line with company's expectations.

Shares up 45 pence, or 7.69%, at 630 pence.

SERVICEPOWER TECHNOLOGIES PLC (SVR.LN), a field service management firm, said strong growth in revenue in the first half of this year has continued into the second half, with a steady performance month by month expected through year end.

Shares up 1.5 pence, or 41%, at 5.13 pence.

INTERNATIONAL FERRO METALS LTD. (IFL.LN), which produces ferrochrome--the essential ingredient in stainless steel--said it has had a favorable result for the first quarter and, after several years of losses, it expects to return to profitability this financial year.

Shares up 0.25 pence, or 2.38, at 10.75 pence.

STYLES & WOOD GROUP PLC (STY.LN), an integrated property services and project delivery specialist, said the improvement in markets noted at the interims has continued, albeit at a slow rate, and it expects the financial performance for 2013 to be in line with market expectations.

Shares up 0.25 pence, or 3.17%, at 8.13 pence.

FTSE Small-Cap -0.18%

AIM +0.13%

Write to Ian Walker, Rory Gallivan and Tapan Panchal at uksmallcaps@wsj.com

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