Steve Ballmer blasts founder he backed who pleaded guilty to fraud: ‘I was duped and feel silly’

Silicon Valley tends to tolerate a certain amount of founder exaggeration when pitching investors, often dismissing it as part of selling a vision. But some choices cross the line and can lead to jail time for founders and scandal for their investors.

A case in point is Joseph Sanberg, whose once high-flying fintech startup Aspiration Partners was backed by a roster of tech celebrities, including former Microsoft CEO and current Clippers owner Steve Ballmer. In August 2025, Sanberg pleaded guilty to two counts of wire fraud and defrauding multiple investors and lenders, the U.S. Department of Justice said in a press release. Each count carries a maximum sentence of 20 years in prison.

Ahead of sentencing, which is scheduled for Monday, victims were invited to describe their experience with Sanberg to the judge. Ballmer did so, and publicly. Ballmer’s lawyers said in the letter that he has lost money, been vilified, and that the NBA is investigating allegations stemming from the association.

Sanberg co-founded green fintech startup Aspiration Partners, which offered what it called sustainable banking services like credit cards and investment products that avoided fossil fuels. The startup promised to “automatically plant trees with every card purchase.” In 2021, it announced plans to go public via a SPAC merger at a value of $2.3 billion, though that transaction never took place.

The DOJ alleged that Aspiration booked and recognized revenue from entities held by Sanberg, who made the company appear as if it had a steady of stream of customers and revenue that it didn’tt actually have. The agency further alleged he defrauded investors by showing them a fabricated letter from Aspiration’s audit committee that said the company had $250 million in available cash and equivalents when it had less than $1 million. The DOJ alleged that Sanberg, along with a board member who also pleaded guilty, falsified financial records to obtain $145 million in loans.

When Ballmer shared his letter on X, asking the judge to consider the harm done to him in sentencing, he wrote, “I was duped and feel silly about that. Everyone who believed in Aspiration, including employees, customers and investors, was also duped. Everyone is still tallying the losses.”

The letter says that Ballmer invested a total of $60 million in the company, and lost all of it. Ballmer was not only an investor, but had contracted with Aspiration to provide carbon-offsetting programs for the Clippers and its stadium. Aspiration also became a major Clippers sponsor.

The billionaire said in the letter that not only did he lose that money, his reputation was negatively affected. He used the letter to deny the reporting of a multi-part series from famed sports podcast Pablo Torre Finds Out that delved into the relationship between the Clippers and Aspiration. The podcast made allegations that Aspiration helped sidestep the salary cap for a star Clippers player. Ballmer’s lawyers called those allegations “misapprehension or intentional disregard of the facts,” in the letter.

Ballmer’s letter also said that as a result of the association with this company, the podcast and other public attention of it, he’s been named in lawsuits. Meanwhile, the NBA said in its own letter regarding Sanberg’s sentencing, that it’s investigating the salary cap allegations and Sanberg has been providing evidence, ESPN reported.

While the basketball world is embroiled in all of these downstream developments, the message founders can take from it is clear: if one fabricates financial documents to raise capital, the outcome will very likely be prison.

The Ballmer Group did not respond to our request for comment.