SEATTLE — Tyson Foods Inc. agreed to pay $10.5 million to settle a poultry price-fixing lawsuit filed by Washington Attorney General Bob Ferguson a year ago.

In Mr. Ferguson’s lawsuit against 19 total poultry processors, Tyson is the third to settle and will pay the largest resolution thus far.

As part of the court order, Tyson will provide documentation relevant to the case in cooperation with Mr. Ferguson against the other alleged co-conspirators.

According to Mr. Ferguson’s claims in the lawsuit, around 90% of Washingtonians — 7 million individuals — were affected by a conspiracy of chicken producers to drive up chicken prices since 2008.

“These corporate executives make more money than most Washingtonians can imagine, yet they decided to cheat those hardworking Washington families in order to satisfy their greed,” Mr. Ferguson said. “We will do everything in our power to make Washingtonians whole for the harm done to them by this price-rigging conspiracy.”

In May 2022, Mar-Jac Poultry settled the attorney general’s claims with $725,000. Fieldale Farms Corp. is the third company to have reached an agreement with Mr. Ferguson, settling on $475,000 in August 2022.

The remaining 16 companies named in the lawsuit include Pilgrim’s Pride Corp., Perdue Farms Inc., Koch Foods Inc., Sanderson Farms Inc., Foster Farms LLC, Mountaire Farms Inc., Wayne Farms LLC, Amick Farms LLC, George’s Inc., Peco Foods Inc., House of Raeford Farms Inc., Case Foods Inc., Norman W. Fries Inc., d/b/a Claxton Poultry Farms Inc., Simmons Foods Inc., O.K. Foods Inc. and Harrison Poultry Inc.