Prism`s share price closed at 88c on Friday, up 13c or 17.3% from the previous close.
About 3.46 million shares changed hands during the day.
The move came as the secure electronic payments group issued a trading statement saying it expects to report a 60% to 70% increase in headline earnings per share (HEPS) for the six months to December 2005, compared with the same period a year earlier.
This means that HEPS should rise to between 2.7c and 2.9c, compared with the 1.7c reported for the December 2004 interim period.
The group is also expecting to report a 170% to 180% rise in earnings per share when it publishes its results on 2 February.
The group achieved EPS of 1.1c previously.
Prism`s trading update attributes the improved figures mainly to a continued positive trading performance, a halt to goodwill impairment and a reduction of about 9% in the number of fully diluted weighted average shares in issue.
The reduction in shares in issue is the result of share purchases carried out by the staff trust.
Prism reported in August last year that it had grown HEPS by 21.7% to 5.6c, despite global pricing pressures and rand strength.
About 55% of revenue for the year was dollar denominated.
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