Mar.30, 2010, 11:13 AM EDT

March 30 (Bloomberg) -- Wirecard AG fell the most in more than 20 months in Frankfurt trading after Munich prosecutors were asked to investigate the German maker of electronic payment and risk management software.

The shares fell as much as 2.41 euros, or 32 percent, to 5.07 euros, the biggest intraday decline since July 18, 2008. The stock traded at 6.30 euros as of 4:04 p.m.

Munich’s prosecution office received a complaint and is examining it, Barbara Stockinger, a spokeswoman for the prosecutor, said today by telephone. She declined to give details.

The shares also declined after financial news service Goldman Morgenstern & Partners reported on its Web site that a man accused of money laundering in Florida, who pleaded guilty to a lesser charge, had implicated Wirecard in the case.

Wirecard is “rejecting any money laundering allegations,” the company said in an e-mailed statement today. The company has hired a law firm to take legal action against an “Internet portal” that spread “wrong claims” about its business activities, Wirecard said.