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Grant Cardone, the bombastic real estate mogul who has spent two decades selling the gospel of "10X" hustle to a social media following he says exceeds 16 million people, is being sued for one billion dollars by the man he hired to be his Chief Marketing Officer. The complaint, filed May 20, 2026, in the Circuit Court of Columbia County, Florida, paints a portrait that is starkly different from the swaggering image Cardone projects online. According to the lawsuit, the man behind a $4 billion real estate empire and a fleet of jets allegedly retaliated against an internal whistleblower with a barrage of social media attacks designed, in the plaintiff's words, to leave his "entire reputation cooked."

The plaintiff is Brian H. Robb, a Florida resident who served as Cardone Capital's Chief Marketing Officer and who, according to the complaint, helped raise approximately $50 million for the company before things went catastrophically sideways. The case is styled Robb v. Cardone, Case No. 2026-CA-180, and it names both Grant Cardone personally and Cardone Capital, LLC, the Delaware-organized investment vehicle that anchors the Cardone brand. The complaint demands damages in excess of $1,000,000,000.

The Allegations Behind the Headlines

According to the complaint, Robb's troubles did not begin with a marketing disagreement or a soured negotiation over a bonus. They began, the lawsuit alleges, with a conscience. While employed as CMO, Robb says he uncovered conduct by Cardone and Cardone Capital that he reasonably believed was fraudulent, and he reported it to federal authorities, including the FBI. He says he cooperated with investigators for roughly 18 months, during which he continued in his role at the company.

Cardone, for his part, has publicly characterized that cooperation in very different terms. In a Facebook post dated February 10, 2026, that the lawsuit reproduces verbatim, Cardone wrote that Robb "didn't come to me with concerns, instead he went to authorities and made claims that were false and without merit. This resulted in a 18 month investigation while he continued on payroll and without my knowledge secretly recorded audio & video inside my offices. The case was closed as authorities stated 'absolutely no signs of wrong doing, fraud or misappropriations.'" Cardone went on to question whether whistleblowers should face liability "when they get it wrong," then added a personal jab, calling Robb "a little goofy, momma's boy, entitlement issues, low energy, and insecure about his hairline."

Two days earlier, on February 8, 2026, Cardone had already taken to Facebook with a post that asked his followers, "Anyone know this goofy dude?" Cardone disputed that Robb had raised $50 million for him, said Robb's marketing genius was "NEVER revealed working for me," claimed Robb had "NO SOCIAL FOLLOWING" of his own, and stated that the company terminated him after a short stint. "When he was gone we did not miss him," Cardone wrote. He signed off with the disclaimer that the post was "just my opinion & experience," and urged readers to do their "full due diligence."

Robb's lawyers argue that the opinion label does not insulate Cardone. They contend the posts contain verifiable factual assertions — that Robb did not raise the money he claimed, that he made false reports to authorities, that he was fired for performance — and that those assertions are demonstrably false. Robb's complaint asserts two counts of defamation per se, one against Cardone individually and one against Cardone Capital under the doctrine of respondeat superior. Florida law presumes damages in defamation per se cases involving accusations that injure someone in their trade or profession.

The complaint also describes a follow-up email Cardone allegedly sent to third parties stating that Robb "misled investigators," "wasted taxpayers' money," and made "completely unsubstantiated" and "absolutely false allegations." Robb says the reputational damage materialized almost immediately: a third party reached out to tell him he had been "publicly exposed" by Cardone "in front of the entire world" and threatened to inform Florida commercial real estate brokers that Robb was "a liar, con artist, and fraud." That same third party later told Robb his "entire reputation is cooked" with "Grant Cardone dragging your name through the mud."