Kalshi has secured exclusive, multiyear prediction-market partnerships with five Major League Baseball teams: the Atlanta Braves, Boston Red Sox, Los Angeles Dodgers, San Diego Padres, and San Francisco Giants. These deals mark Kalshi's growing presence in MLB, now partnering with a sixth of the league’s 30 teams. As part of the agreements, Kalshi’s branding will appear on in-stadium signage, social media, and other fan engagement channels, including the renaming of the Dodgers' Gold Glove Bar to the Kalshi 435 Club. The platform reports a dramatic 36-fold increase in baseball-related trading volume over the past year.

These new partnerships come less than six months after Polymarket became MLB's exclusive prediction-market partner, with seven teams in total now engaged with prediction-market firms. Notable recent agreements include the New York Yankees joining Polymarket this season and the New York Mets signing an exclusive, multiyear deal with Novig. Despite growing interest, several teams like the Guardians, Nationals, Phillies, and Rockies confirm they have not yet pursued these partnerships, indicating uneven adoption across the league.

Kalshi’s deals have led to increasing activation at stadiums before official announcements, sparking speculation that teams are quietly negotiating to limit fan backlash. This tension arises amid legislative challenges, as several states are suing to regulate prediction markets like traditional sports betting. Public criticism has come from figures like Senator Richard Blumenthal, who condemned MLB’s involvement, though insiders suggest teams expect and accept fan reactions as part of embracing innovation and new revenue streams.

MLB clubs involved in these deals emphasize the aim of enhancing fan engagement through these innovative platforms. Executives from the Red Sox, Dodgers, and Giants each highlighted the partnerships as natural fits that open new avenues for fan interaction. While Kalshi has publicly termed some deals as exclusive, it has recently corrected claims around exclusivity with the Giants and Braves, characterizing the misstatements as accidental. Overall, the rise of prediction-market partnerships reflects MLB’s evolving commercial landscape despite ongoing regulatory uncertainties.