Herve Falciani, a 43-year-old French-Italian national who exposed the so-called Swissleaks scandal, has repeatedly said he would not travel to Switzerland for the trial and already failed to show for his initial court date last month, so his absence did not come as a surprise.
"I am not going," Falciani told reporters in Divonne, France, just a stone's throw from the border with Switzerland, last week, questioning the possibility of obtaining a fair trial.
After a short recess, the trial resumed and will continue in his absence.
As a French national living in France, he cannot be extradited to Switzerland.
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The first witnesses in the case are due to be called to the stand tomorrow, starting with the police officers who investigated Falciani's case and current and former employees of the HSBC Geneva branch.
One of his former girlfriends, who lives in Lebanon, also figures on the witness list, although it is not clear if she would show up.
He became an IT worker for HSBC in 2000 and moved to the bank's offices in Geneva in 2006.
The so-called "Snowden of tax evasion" and "the man who terrifies the rich" obtained access to a massive database of encrypted customer information, which was passed on to European fiscal authorities.
While he is viewed as a whistleblower and hero in countries where his leaked information is helping to net tax cheats, the Swiss authorities remain intent on prosecuting him.
Geneva prosecutors in June closed their investigation into HSBC's alleged wrongdoings after the bank agreed to pay tens of millions of dollars in compensation.