Rubin's Kalshi Stake Revealed in Fanatics Legal Battle

Dr. Annelies De Vos · 2026-02-20

A recent court filing in Florida has pulled back the curtain on some high-stakes drama in the prediction markets world. It reveals that Fanatics, the sports merchandise giant turned betting operator, sued a former executive who jumped ship to join Polymarket. Here's the twist—Fanatics' own founder, Michael Rubin, allegedly holds a personal investment in Kalshi, a direct competitor to Polymarket. It's a situation that makes you raise an eyebrow. The legal documents, first reported by Front Office Sports, show testimony from ex-Fanatics Chief Business Officer Ari Borod. He stated that after a conversation with Fanatics Betting and Gaming CEO Matt King, he understood both King and Rubin had personal stakes in Kalshi. What's crucial here is the timing. This investment reportedly happened before Fanatics even launched its own prediction markets product in early December. ### The Non-Compete Dispute So, what sparked the lawsuit? Fanatics tried to block Borod from moving to Polymarket after he gave notice in December for a January start. The company claimed he was bound by a one-year non-compete clause, arguing Polymarket was a direct competitor. Borod pushed back hard. He claimed his contract didn't include such a clause and, interestingly, argued that Fanatics wasn't a direct competitor at the time. He also alleged that his former employer threatened to bring "the entire weight of Fanatics" against him if he made the move. That's a pretty heavy statement. Borod started his new role as Polymarket's sports business development president on January 2nd. Fanatics filed for a temporary injunction ten days later, on January 12th. The whole messy situation was eventually settled out of court, leaving us to wonder about the details. ### Pursuing Major League Partnerships Another layer to this story involves big-name sports leagues. The court filing shows Fanatics claimed Borod improperly pursued relationships for Polymarket with major leagues like the NBA and MLB. To date, neither league has partnered with a prediction market company, making these potential deals a huge prize. Borod's defense was that he didn't start these conversations. He said he simply joined pre-existing talks about potential partnerships. It's a classic "he said, they said" scenario in the corporate world. The financial stakes were very real for Borod personally. He argued that blocking his move to Polymarket would cause serious harm to his career and finances. He put a price tag on that potential damage: more than $5 million. That's not just a number; it's a life-changing sum. Let's break down the key players and their alleged connections: - **Michael Rubin:** Fanatics founder/CEO, alleged personal investor in Kalshi. - **Matt King:** Fanatics Betting and Gaming CEO, also alleged to have a personal Kalshi stake. - **Ari Borod:** Former Fanatics CBO, moved to Polymarket, triggering the lawsuit. - **Kalshi:** Prediction markets company, rival to Polymarket, where Rubin and King allegedly invested. - **Polymarket:** Prediction markets platform that hired Borod, sparking the non-compete fight. This case highlights the blurred lines and potential conflicts of interest that can emerge in fast-growing, interconnected industries like sports betting and prediction markets. When executives have personal investments in competing companies, it creates a tangled web. It makes you question where loyalty lies and how companies protect their business interests. The out-of-court settlement means we might never get all the answers. But the unsealed filing gives us a rare glimpse into the behind-the-scenes maneuvering and high-pressure tactics that define competition at this level. It's a reminder that in the business world, the game is often played just as fiercely off the field as on it.