"Sam Bankman-Fried perpetrated one of the biggest financial frauds in American history," Damian Williams, U.S. attorney for the Southern District of New York, said in a briefing after the verdicts were read. "While the cryptocurrency industry might be new and the players like Sam Bankman-Fried might be new, this kind of corruption is as old as time. This case has always been about lying, cheating, and stealing, and we have no patience for it."

Attorney General Merrick Garland said in a statement: "Sam Bankman-Fried thought that he was above the law. Today's verdict proves he was wrong."

"This case should send a clear message to anyone who tries to hide their crimes behind a shiny new thing they claim no one else is smart enough to understand: the Justice Department will hold you accountable."

The federal trial, which began in early October, pitted the testimony of Bankman-Fried's former close friends and top lieutenants against the sworn statements of their former boss and ex-roommate. The jury returned a swift verdict after receiving the case at around 3:15 p.m. ET on Thursday and breaking for dinner at around 6 p.m. ET.

At 7:37 p.m. ET, the attorneys began to rush back into the courtroom, and the clerk said, "the jury has reached a verdict." A minute later, the jury was back in the room.

Bankman-Fried's parents were visibly nervous entering the courtroom. They sat in the second pew, and took turns putting their arms around each other. When the defendant, wearing a purple tie and a black suit, returned to the table with his attorneys, he leaned back in his chair. He didn't flinch and stared straight ahead.

From the top floor of the lower Manhattan courthouse, Judge Lewis Kaplan, who presided over the trial, instructed Bankman-Fried to stand and face the jury box as the verdicts were read. The only two people standing were the forewoman and the defendant.

By 7:47 p.m. ET, all counts had been read. Bankman-Fried remained stoic. He didn't cry.

Immediately after the guilty verdicts, Bankman-Fried's attorney, Mark Cohen, asked jurors to be polled. They went juror by juror, and each was asked if their verdict was read properly. Each said yes.

Kaplan thanked the jurors for their service, and they were escorted out.

Kaplan then asked about the second trial Bankman-Fried is facing on March 11. The government has until Feb. 1 to let the court know if it plans to still proceed. The sentencing date is March 28 at 9:30 a.m. ET.

At around 8:02 p.m. ET, Bankman-Fried began to walk to a side room. His parents were standing at the front of the center aisle, waiting for their son.

Following the verdict, Cohen said in a statement that Bankman-Fried "maintains his innocence and will continue to vigorously fight the charges against him."

The monthlong trial was highlighted by testimony from the government's key witnesses, including , Bankman-Fried's ex-girlfriend and the former head of Alameda, and FTX co-founder , who was Bankman-Fried's childhood friend from math camp. Both in December to multiple charges and cooperated as witnesses for the prosecution.

Most of the defense's case was built on the testimony of Bankman-Fried himself, who told the court that he didn't commit fraud or steal customer money, but just made some business mistakes.

The central question for jurors to consider was whether Bankman-Fried acted with criminal intent in taking customer funds from FTX and using that money to pay for real estate, venture investments, corporate sponsorships, political donations and to cover losses at Alameda after crypto prices plunged last year.

Assistant U.S. Attorney Nicolas Roos told the court in his closing argument Wednesday, there was "no serious dispute" that $10 billion in customer money that was sitting in FTX's crypto exchange went missing. The issue, he said, is whether Bankman-Fried knew that taking the money was wrong.

"The defendant schemed and lied to get money, which he spent," Roos said.

Bankman-Fried now awaits sentencing. His case has been compared with that of Elizabeth Holmes, founder of medical device company Theranos, which ceased operations in 2018.

Holmes, 39, was convicted in early 2022 on four counts of defrauding investors in Theranos after testifying in her own defense. She was to more than 11 years in prison, and her punishment in May at a minimum-security facility in Bryan, Texas.

— CNBC's Dawn Giel contributed to this report.

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