In 2019, this company agreed to pay US$13 million to settle antitrust claims against it as part of the 'In re Liquid Aluminum Sulfate Antitrust Litigation' class action. The claims related to allegations of fixing prices for liquid aluminum sulfate (Alum), a water treatment chemical. This company did not itself make or sell Alum, but between 2009 and 2014 it owned General Chemical, which allegedly participated in an Alum price-fixing conspiracy with other chemical suppliers. The plaintiffs in the litigation based their claims on this private equity firm's allegedly active management of its portfolio company's bidding process alleging that American Securities required General Chemical to obtain its approval for bids over a threshold amount.