What is the sentiment of this news? Please choose an answer from {strong negative/moderately negative/mildly negative/neutral/mildly positive/moderately positive/strong positive}.

Costco (NASDAQ: COST) stock, the second largest warehouse club operator in the U.S. behind only Walmart's Sam's Club, has increased by 13% over the last twenty-one trading days (one month) and currently stands at around $516.
moderately positive