Sigurdur Thordarson

Sigurdur Ingi Thordarson (Sigurður Ingi Þórðarson) (born 1992), commonly known as Siggi hakkari ("Siggi the Hacker"), is an Icelandic convicted criminal and FBI informant against WikiLeaks.

He is known for information leaks, multiple cases of fraud and embezzlement, sexual solicitation of minors and adults.

He has multiple convictions for sexual offences.

Thordarson began leaking information about the Icelandic banking system to the media in late 2009.

This included information about individuals in the Icelandic banking system, information that showed that individuals were committing illegal acts in relation to banking.

One of the leaks by Thordarson concerned a case called "Vafningsmálið."

It involved Bjarni Benediktsson during his time as an MP.

Bjarni reported that the case was only a political smear campaign.

The information published by Icelandic news media obtained from Thordarson also showed that one of the country's biggest football stars, Eiður Guðjohnsen, was deeply indebted and almost bankrupt.

After the information was published, Eiður sued the local newspaper DV for publishing this information.

DV lost the case in a lower court, but won an appeal to the Supreme Court of Iceland, stating that the information was a matter for the public.

Amongst other information that Thordarson admitted to have leaked in an interview with the Rolling Stone magazine was information about local businessman Karl Wernersson.

He was the owner of the Milestone ehf that was the investment company from which Thordarson stole most of the information.

Other names in the documents leaked by Thordarson included information about Birkir Kristinsson, who had recently been convicted of economic crimes while working for Glitnir bank.

Some speculate that information from Thordarson was used as evidence in that case, Thordarson also leaked a classified report about one of the bigger aluminum plants in Iceland.

The report stated that the plant was paying 1/4 of what other aluminum plants in the world are paying for electricity.

Other information leaked by Thordarson contained information about other local business men such as Gunnar Gunnarsson, who also has been reported to assist football star Cristiano Ronaldo in tax affairs.

Kristinn Hrafnsson thought Thordarson's leaks were "quite significant" and introduced him to Julian Assange.

In 2009, Thordarson arrived at the offices of the Special Prosecutor, who investigated the bank collapse in Iceland in 2008.

Thordarson reportedly gave them all the information he had on Milestone and other local business men, however instead of using some of the information obtained from Thordarson in investigation the investigators decided to sell the information.

The case against the two police officers was later dismissed, and it has been reported that the investigators made roughly 30 Million ISK ($250.000) from the documents.

In 2010, at the age of 17, he was arrested for stealing and leaking classified information about Icelandic financial companies.

After his arrest, Kristinn Hrafnsson introduced him to Julian Assange, the editor and founder of WikiLeaks, and he worked as a volunteer for the organization between 2010 and 2011.

He began hacking at age 12 and joined WikiLeaks in February 2010 when he was 17 years old and in high school.

He went to university to study computer science and psychology, but says he was suspended for hacking.

Thordarson began working for WikiLeaks as early as February 2010 and was fired in November 2011.

In a few weeks, Thordarson was in Assange's inner circle.

According to one former volunteer, "the perception was that Siggi basically got to a level where Julian trusted him in a matter of days."

Birgitta Jónsdóttir, a former WikiLeaks volunteer and member of the Icelandic parliament who worked on Collateral Murder, described Julian Assange's relationship with Thordarson as like "Batman and Robin."

Several of WikiLeaks' core volunteers said that Siggi was a dangerous liability, prone to indiscretions and lies and Jonsdottir warned Assange not to trust Thordarson.

Assange told others not trust or talk to Thordarson, but continued working with Thordarson.

According to Daniel Domscheit-Berg, "it all implied Julian was using him. These are all kinds of games children get into."

In 2011, Thordarson contacted the FBI and offered to become an informant, turning over numerous internal WikiLeaks documents and hard drives in the process.

WikiLeaks accused him of having embezzled $50,000 from the WikiLeaks online store to which he pleaded guilty along with other economic crimes against other entities.

He was also accused of using Julian Assange's name in legal documents.

In June 2021, in an interview with Icelandic newspaper Stundin, Thordarson recanted some of the previous accusations he had made against Julian Assange.

Stundin said the accusations were used in the American indictment against Assange, but The Washington Post disagreed.

Thordarson grew up middle-class in Reykjavik with a younger sister.

In 2013, Thordarson argued with Birgitta Jónsdóttir on Twitter over the release of the loanbooks of the Glitnir Bank.

Thordarson said she had no involvement, but he claimed that he had given her the files years ago.