Callisto Research & Muddy Waters Research
3 shared events · Importance 3 · Last updated Jul 15, 2026
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Callisto Research is a newer activist short-selling firm that operates as a peer and competitor to the established Muddy Waters Research. While independent, the two firms occasionally align on targets, such as their parallel short campaigns against Sportradar in 2026.
Business
Callisto Research: Callisto Research published a report corroborating allegations against Sportradar, claiming the company has ties to illegal gambling and sanctioned parties, further contributing to the stock decline and legal actions.
Muddy Waters Research: Muddy Waters Research published a report accusing Sportradar of aiding and abetting illegal gambling, which triggered the stock price drop and subsequent lawsuits.
Apr 23, 2026 · 383 articles
Regulatory
Callisto Research: Callisto Research published a report on April 22, 2026, alleging that over 270 platforms using Sportradar's services operate illegally, contributing to the stock collapse.
Muddy Waters Research: Muddy Waters Research published a report on April 22, 2026, accusing Sportradar of aiding illegal gambling, which triggered the stock decline. The firm is a key catalyst in the event.
May 21, 2026 · 278 articles
Regulatory
Callisto Research: Callisto Research published a report corroborating allegations of Sportradar's ties to unlicensed operators.
Muddy Waters Research: Muddy Waters published an investigative report alleging Sportradar aided illegal gambling, triggering the stock collapse.
Jul 05, 2026 · 46 articles
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