Shares of used-car retailers Carvana Co. CVNA rallied more than 12%, and shares of CarMax Inc. KMX rose around 2%, in midday trading Thursday, with just hours to go for a contract’s expiration for autoworkers at Ford Motor Co. F, General Motors Co. GM, and Stellantis NV STLA. Union and companies remain far apart ahead of the 11:59 p.m. Thursday expiration, and the United Auto Workers has vowed to strike at all three companies if no deal is reached.

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