By Bret Kenwell Costco stock is one of the best in the market right now and its recent run to all-time highs shows why. Excluding portfolio management and diversification, if investors were long just Costco Wholesale (COST) – Get Costco Wholesale Corporation Report and didn’t read the news, they wouldn’t know the market is in a correction. The stock has been in an impressive uptrend, something both traders and investors love to see. “Stick with the trend until it bends,” is a common phrase known on Wall Street. If we abide by that, then there’s no reason to be bearish on this retailer. Costco …