A cruise on the Mediterranean Sea aboard a superyacht was supposed to be a celebratory event for the British tech entrepreneur Mike Lynch, who was acquitted in June of fraud charges tied to the sale of his company, Autonomy, to the tech giant Hewlett-Packard.

Instead, it turned into a disaster after the yacht, a 180-foot boat called the Bayesian, sank off the coast of Sicily in a violent storm. Of the 22 passengers aboard, 15 were rescued, one body was recovered and six were still missing. Search operations at the site of the sunken yacht were continuing on Tuesday.

Here’s what we know about the passengers.

Mike Lynch and his family

Mr. Lynch, 59, is a British software entrepreneur who had once been described as his country’s Bill Gates. He founded the software firm Autonomy, which analyzed clients’ unorganized data, and turned it into one of the most prominent British technology companies of its time. He became a widely known corporate leader, who advised David Cameron, the British prime minister at the time, and joined the board of the BBC.

In 2011, Mr. Lynch sold Autonomy to Hewlett-Packard for $11 billion, which was far above its market value, earning him hundreds of millions. But HP investors almost immediately soured on the transaction, and the American tech giant quickly fired its chief executive — and then Mr. Lynch.

HP later accused Mr. Lynch of misleading it about the state of Autonomy’s business, setting off a decade-long legal ordeal for the British executive, who denied the accusations. U.S. prosecutors charged him and other executives with fraud, and Autonomy’s chief financial officer was convicted in 2018.

Despite appeals to the British government, Mr. Lynch was extradited to the United States last year and was confined to a townhouse in San Francisco ahead of his criminal trial, which began in March. Facing the possibility of decades in prison if convicted, Mr. Lynch and another colleague were instead acquitted of all charges.