Shares of Costco Wholesale Corp (COST) continue to weaken within the SIA S&P 100 Index Report, currently sitting in the red unfavored zone at spot #80, despite a relatively low 6.35% standard deviation. Performance has deteriorated further with COST down 5.61% year-to-date and 12.35% over the past six months, while relative strength has also broken down versus cash, contributing to a SMAX score of 0 out of 10. From a technical perspective, the stock has failed at all-time highs and has since slipped back into the unfavored zone, with key support levels now identified well below current prices.