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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."

Not Cardone's First Lawsuit — Or His Tenth

Robb v. Cardone arrives at a moment when the courthouse has become an uncomfortably familiar destination for the self-styled "Uncle G." The most consequential of Cardone's ongoing legal headaches is Pino v. Cardone Capital, a putative securities class action originally filed in 2020 by investor Luis Pino and later carried forward by Christine Pino after his death. The Pino plaintiffs allege that Cardone used Instagram, YouTube, and other social platforms to push Cardone Equity Fund V and Fund VI to unaccredited investors by touting a 15 percent annual internal rate of return, downplaying fund debt, and concealing a letter from the Securities and Exchange Commission that had instructed Cardone Capital to remove those projections from its offerings because they lacked support.

A federal district judge in California initially dismissed Pino's claims, concluding that social media puffery was not actionable under the Securities Act. The Ninth Circuit Court of Appeals disagreed. In a published decision issued June 10, 2025, the appeals court reinstated the case, holding that sellers of securities who use social media to solicit prospective investors can be liable under Section 12(a)(2). The panel found that Pino had sufficiently alleged Cardone subjectively disbelieved the 15 percent projection he was broadcasting, and that the failure to disclose the SEC letter could amount to a material omission. The case is now scheduled for trial in March 2027 — and former senior Department of Justice fraud prosecutor Paul Pelletier, after reviewing the filings, told reporters that Cardone's business "is built on lies and deception that will likely collapse leaving investors holding an empty bag."

Pino is far from the only piece of recent litigation. In January 2026, Chealse Sophia Howell — a former Miss Canada and Miss Universe Canada delegate — filed a $500 million defamation suit against Cardone and Cardone Capital in Miami-Dade County, alleging that Cardone orchestrated a coordinated social media campaign falsely accusing her of serious criminal conduct, including human trafficking in the Middle East. The Howell case, like Robb's, centers on the explosive reach of Cardone's personal social channels and the company's alleged willingness to deploy them as weapons.

Then there is the spectacular falling-out with biohacker and 10X Health co-founder Gary Brecka. After Brecka's exit from 10X Health in November 2024, Cardone and Brecka filed dueling federal and state lawsuits accusing each other of fraud, breach of contract, and assorted business torts. The federal action filed by Cardone Ventures was settled in 2025 under terms that were not disclosed, but related state-court actions and a separate $100 million defamation suit filed by Brecka against Elena Cardone — over an Instagram clip featuring Brecka and Sean "Diddy" Combs and the caption "boy bye!" — kept the dispute alive well into 2026.

Beyond securities and defamation, Cardone has faced criticism in other arenas. A 2022 investigative report by The Palm Beach Post found that, between 2018 and 2021, the Cardone Capital-owned Wellington Club apartment complex in the Miami area overcharged tenants in a government workforce-housing program meant to provide discounted units to teachers, nurses, and first responders. In 2015 and 2016, several former employees of Cardone Training Technologies filed religious discrimination complaints with the Equal Employment Opportunity Commission, alleging they had been fired for refusing to take Scientology-based training courses — a claim that loomed over Cardone, an outspoken member of the Church of Scientology, for years. And court records from disputes over Cardone's training programs include claims from former clients who say they were locked into lengthy, inflexible contracts they could neither afford nor escape.

Cardone's twin brother Gary, who provided the seed capital for Cardone Capital, has weathered his own federal scrutiny. The Federal Trade Commission has pursued civil action against Gary Cardone's payments-related business, alleging that it helped scammers evade credit-card fraud alerts. The FTC has asked a court to shut the business down and order restitution to consumers.

What's at Stake

Cardone has built his fortune by promising ordinary Americans that the rules of wealth are simpler than they look — that anyone willing to follow his playbook can move from renter to multimillionaire. The thread that ties Robb's billion-dollar complaint to the Pino class action, the Howell defamation suit, and the Brecka feud is that each plaintiff alleges Cardone weaponized the very thing that built his empire: a massive, loyal, scrolling audience. Robb's lawyers argue that when a man with 16 million followers names a private individual and accuses him of dishonesty, the harm is not hypothetical. It is, in their words, "foreseeable, severe, and presumed under Florida law."

Cardone has not yet filed a formal answer to the Robb complaint, and he has consistently denied wrongdoing in his other matters, vowing on social media to "clear his name." The Robb case is in its earliest stages, and the plaintiff carries the burden of proving falsity, fault, and damages. But the filing makes one thing unmistakable. The same megaphone that turned Grant Cardone into a household name among aspiring investors has now been pointed back at him from a Columbia County courthouse — and this time, the man on the other end of the bullhorn is asking a jury to put a ten-figure price tag on the consequences.