About 18,000 Costco workers will go on strike beginning Feb. 1 if their union doesn’t reach a deal with the warehouse retailer, the union announced Sunday. The Teamsters represent Costco workers in 56 warehouses across five states,

The strike authorization vote passed with an 85% margin, the union said. Investors didn’t seem concerned, however. Costco stock was up 1% to $952.28 in midmorning trading Tuesda

Thousands of Costco workers are gearing up to walk the picket lines. Over 18,000 union workers voted to authorize a strike when their current contract expires on Jan. 31. The workers are asking for better wages and benefits.