On May 5, 2023, Compass Minerals fully took over Fortress. In 2023, Fortress only sold its fire retardant products to the United States Forest Service. According to the complaint, during the class period, defendants failed to disclose that (1) Compass Minerals overstated the likelihood that it would be awarded a renewed U.S. Forest Service contract for the use of its proprietary magnesium chloride-based aerial fire retardants for the 2024 fire season due to safety issues presented by its fire retardant, and (2) Compass Minerals materially overstated the extent to which testing had confirmed that its fire retardants were safe.