Former Anglo Irish Bank chief executive David Drumm has received a 15-month suspended sentence for providing unlawful loans to a group of businessmen known as the 'Maple 10'.
In sentencing Drumm, Judge Karen O'Connor said the defendant was in a "position of trust" in the bank, that he was the "instigator" of the scheme and the markets were misled.
However, she said Drumm's guilty plea had been of considerable assistance in what would have been a "lengthy and complex" trial.
Judge O'Connor suspended the 15-month sentence for 15 months.
Drumm (51), from Skerries, is already serving a six-year sentence for false accounting and a €7.2bn conspiracy to defraud.
Wearing blue jeans and a green fleece sweatshirt, Drumm did not react when the sentence was handed down.
Last month, he pleaded guilty before Dublin Circuit Criminal Court to giving unlawful financial assistance to 10 businessmen so they could buy shares in the bank during the 2008 financial crisis.
Judge O'Connor heard evidence yesterday that the loans were given to unwind a massive secret stake Sean Quinn had built up in the bank using financial instruments known as contracts for difference (CFDs).
These allowed Mr Quinn to bet on the performance of the shares without actually owning them, but in reality he effectively had a 25pc stake in the bank.
Detective Sergeant Brian Mahon agreed with prosecution counsel Paul O'Higgins SC that after Drumm learned of the scale of the CFD position, there was concern within Anglo it would affect the stability of the bank's share price.
Drumm then made efforts to find buyers for the shares in the Middle East and the US.
When none could be found, a scheme was arranged where Anglo issued loans to Quinn family members to buy a 15pc shareholding and to 10 wealthy clients of the bank to buy the remaining 10pc.
Sgt Mahon said that although paperwork was handled by Anglo staff, the transactions were instigated by Drumm, who he described as being "at the helm" of what had happened.
A total of €451m in loans were issued to the so-called 'Maple 10' to buy the shares. There is no suggestion any of them did anything wrong.
After a previous trial over the loans, two other former Anglo executives were sentenced to 240 hours' community service.
In a statement, the Office of the Director of Corporate Enforcement (ODCE) said its Anglo-related investigations had resulted in multiple persons being brought to account before the criminal courts.
The Anglo-related investigations were "enormously resource intensive" and with those matters now finished, the ODCE said it looked forward to deploying "its specialist resources to the investigation of other serious indications of wrongdoing".