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FTX founder Sam Bankman-Fried leaves a courthouse in New York, on June 15.MIKE SEGAR/Reuters

FTX founder Sam Bankman-Fried, testifying in his own defense at his fraud trial on Friday, said a “lot of people got hurt” when the cryptocurrency exchange collapsed last year, but insisted he did not defraud anyone or steal billions of dollars from customers.

Mr. Bankman-Fried fielded questions from his own lawyer in his first day of testimony with jurors present, admitting to making “mistakes” such as not implementing a dedicated risk-management team. The 31-year-old former billionaire’s answers conformed to his longstanding argument that he overlooked some things as an entrepreneur building a fast-growing company from scratch but never set out to steal people’s money.

“We thought that we might be able to build the best product on the market,” Mr. Bankman-Fried testified in Manhattan federal court. “It turned out basically the opposite of that. A lot of people got hurt – customers, employees – and the company ended up in bankruptcy.”

Mr. Bankman-Fried answered questions on Thursday without the jury present as the judge assessed what parts of his testimony would be admissible in the trial.

Prosecutors have accused Mr. Bankman-Fried of using FTX customer funds to prop up his crypto-focused hedge fund, Alameda Research, make speculative venture investments and donate more than US$100-million to U.S. political campaigns. He also faces charges of scheming to cheat Alameda’s lenders and FTX investors.

Mr. Bankman-Fried has pleaded not guilty to two counts of fraud and five counts of conspiracy. He was arrested in December, 2022, one month after FTX declared bankruptcy following a wave of customer withdrawals. If convicted, he could face decades in prison.

Prosecutors have said he directed that Alameda be given special trading privileges on FTX, such as a US$65-billion line of credit and an exemption from having its positions liquidated if it posted losses. They have said those privileges let Alameda siphon deposits from the exchange’s unsuspecting customers.

Responding to questions from defence attorney Mark Cohen, Mr. Bankman-Fried occasionally looked toward the jury and spoke in calm, measured tones as he sought to reframe those actions as reasonable business decisions made in response to problems the exchange faced.

However, Mr. Bankman-Fried said he was not aware of how exactly his decisions as chief executive were carried out by his colleagues. Three close former colleagues have pleaded guilty and testified that they committed financial crimes at Mr. Bankman-Fried’s behest.

Prosecutors will be given their chance to cross-examine Mr. Bankman-Fried in front of the jury once the defence is finished questioning him. Prosecutor Danielle Sassoon objected several times that Mr. Bankman-Fried was veering off topic as he gave lengthy answers to Mr. Cohen’s questions.

A ‘MARKET-MAKER’

Alameda, Mr. Bankman-Fried said, was a “market maker” that served to boost volume on FTX, and thus could borrow money from the exchange to make trades.

Mr. Bankman-Fried said he grew concerned about the potential for an “erroneous” liquidation of Alameda’s assets, which would be “catastrophic” for the exchange. He said he directed two FTX computer programmers, Nishad Singh and Gary Wang, to implement a feature to prevent this from happening.

He said he asked them to build a feature that would stall any automatic liquidation, and said he did not know at the time that what his colleagues put in place was a feature that allowed Alameda to carry a negative balance on the exchange.

Prosecutors have said Bankman-Fried also stole funds by having customers at FTX, which initially lacked its own bank accounts, deposit their funds in accounts controlled by Alameda, which then lent money to Mr. Bankman-Fried and other executives.

Mr. Bankman-Fried told the jury he “wasn’t entirely sure what was happening” with those funds, but said he assumed that if Alameda borrowed from it, it would have been recorded on the fund’s FTX account.

Mr. Bankman-Fried testified that he relied on former friends and employees at FTX and Alameda who are now co-operating with prosecutors in his criminal case – Mr. Singh, Mr. Wang and former Alameda CEO Caroline Ellison, his former girlfriend.

Mr. Bankman-Fried testified that Ms. Ellison was a good manager and trader, but not focused on “risk management,” and Mr. Wang was a friend who he “trusted and respected.” Mr. Bankman-Fried and Mr. Wang lived together in an alcohol-free, “nerdy” fraternity house at the Massachusetts Institute of Technology, the defendant said.

Mr. Bankman-Fried, who was jailed in August when U.S. District Judge Lewis Kaplan found he likely tampered with witnesses, presented a clean-cut look to the jury and was clad in a dark suit, a contrast to his trademark former casual look and mop of curly hair. He told jurors that he liked to wear shorts and T-shirts because they were “comfortable.”

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