A former Goldman Sachs Group analyst who pleaded guilty to criminal charges and cooperated with prosecutors in probing an insider-trading scheme that netted more than $6m (€4.6bn) may have fled the country, according to a court filing.

In a letter filed late Monday, Scott Black, a US Securities and Exchange Commission lawyer, said the US Attorney's office in Manhattan has indicated that David Pajcin, a one-time analyst in Goldman's fixed-income division, is in violation of his probation and prosecutors and his criminal defence lawyer believe "he is no longer in the country."