Those companies sold about 80% of more than 25 billion pounds of fresh and frozen beef to the U.S. market in 2018.
The restaurant companies asked for a jury trial, alleging the actions violated the Sherman Act. The chains asked for a court to enter a judgment against the packers for three times the damages sustained.
"Since at least Jan. 1, 2015, until the present, defendants have exploited their market power in this highly concentrated market by conspiring to limit the supply and fix the prices of beef sold to (plaintiffs) in the U.S. wholesale market," the lawsuits allege.
"The principal, but not exclusive, means defendants have used to effectuate their conspiracy is a scheme to artificially constrain the supply of beef entering the domestic supply chain."
In June 2020, the U.S. Department of Justice and USDA launched investigations into price-fixing allegations.
The lawsuits cite information provided by a "confidential witness" who previously worked at a Swift slaughter plant in Cactus, Texas, that "confirmed the existence of a conspiracy" among the companies.
"The witness has confirmed that all of the defendants agreed to reduce their cattle purchases and slaughter volumes for the purpose and effect of increasing their margins," the lawsuits said.
"Defendants' transactional data and slaughter volumes records, information published by the USDA, and defendants' public calls for industry-wide slaughter capacity reductions corroborate witness one's account."
The lawsuits claim the companies' practices created surpluses in the cattle market and shortages in the wholesale beef market.
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