Taking a look at Costco as the retail giant is expected to report earnings tomorrow of $5.08 on revenue of $79.93 billion. Currently, the stock’s shares are trading near all-time highs at around $901.26 a share. However, based on the momentum indicators, it seems like it is somewhat overbought. Hence, a miss in earnings or a revision lower in guidance could put a strain on investor sentiment as we head into the final quarter of the year. Looking at the weekly chart, we can see the price has been within an uptrend since October of last year. The channel drawn on the chart is used simply for psychological support and resistance points as the price continues to trade within. There is clear resistance around $923.32 but a break above here could see a push towards the upper trendline of the channel (around $970), as it has acted as resistance in the past. A disappointment in regard to the earnings report is likely to lead to a sell-off, trendline support reads $850.10. A break and close below the trendline, in theory, would suggest that the uptrend may have been broken. This may have investors looking towards support around $792.53 if the price fails to move back above $900. Looking at the technical indicators, they are hovering around overbought territory. The MACD has thus far failed to move back above its signal line after turning bearish in July, possibly signalling some weakness. The RSI is lagging too much for clarity as it's adjusting ahead of earnings.