Almost half of the 43 defendants who were sentenced in Manhattan federal court in the past eight years for insider trading avoided a prison term, with many never seeing the inside of a jail cell because they cooperated with prosecutors.

Nineteen who were sentenced since 2003, or 44 percent, weren't incarcerated, an analysis of court cases by Bloomberg showed. Of the remainder, the average defendant got a prison term of 18.4 months. The greater the profit made on illegal trades, the longer the sentence. The longest term was 10 years. Danielle Chiesi, who pleaded guilty yesterday for her role in the Galleon Group LLC hedge fund insider-trading scandal, faces between 37 and 46 months in prison.

Since 2009, U.S. Attorney Preet Bharara in Manhattan has stepped up insider-trading prosecutions, charging more than 30 people in three overlapping rings. Of the three defendants sentenced so far in the Galleon ring, the average sentence has been 17 months. The nationwide investigation has implicated hedge funds, technology companies and so-called expert- networking firms.

Almost half of the 43 defendants who were sentenced in Manhattan federal court in the past eight years for insider trading avoided a prison term, with many never seeing the inside of a jail cell because they cooperated with prosecutors.

Nineteen who were sentenced since 2003, or 44 percent, weren't incarcerated, an analysis of court cases by Bloomberg showed. Of the remainder, the average defendant got a prison term of 18.4 months. The greater the profit made on illegal trades, the longer the sentence. The longest term was 10 years. Danielle Chiesi, who pleaded guilty yesterday for her role in the Galleon Group LLC hedge fund insider-trading scandal, faces between 37 and 46 months in prison.

Since 2009, U.S. Attorney Preet Bharara in Manhattan has stepped up insider-trading prosecutions, charging more than 30 people in three overlapping rings. Of the three defendants sentenced so far in the Galleon ring, the average sentence has been 17 months. The nationwide investigation has implicated hedge funds, technology companies and so-called expert- networking firms.