Protein bar maker Quest Nutrition has filed a notice signaling its plans to close two L.A. manufacturing facilities and lay off 524 employees.

The privately held El Segundo company filed a Worker Adjustment and Retraining Notification Act notice Aug. 9 for the permanent closure of its City of Industry and Walnut facilities. Its City of Industry plant will begin laying off 402 workers effective Oct. 12; the Walnut operation will lay off 122 workers starting Oct. 26.

Quest was founded in 2010 and caters its business primarily to the fitness industry. The company has expanded its fare in recent years beyond protein bars and powders for shakes. In 2014 it added snack chips made from dried milk protein, the same stuff used in its fitness shakes. The company made $101 million in sales last year, according to IRI, a Chicago-based market research firm.

Quest did not return calls seeking comment.

– Shwanika Narayan