Is Costco Wholesale Corporation Stock (COST) Overbought or Oversold?
RSI analysis computed from COST's daily closing prices · Data through August 31, 2026
As of August 31, 2026, COST’s 14-day RSI is 47.4, inside the neutral 30–70 band — neither overbought nor oversold by the conventional thresholds.
RSI-14 Scale
COST reads 47.4 on the 0–100 scale.
The Supporting Picture
vs 50-Day MA
-0.5%
MA: $948.87
vs 200-Day MA
+0.1%
MA: $942.68
From 52-Wk High
-10.3%
High: $1051.69
Volume vs 20-Day Avg
-15%
Avg: 1.2M shares
The 50-day average is currently above the 200-day average, which technicians read as a longer-term uptrend backdrop for the RSI reading above.
What's Behind the Reading
August 31, 2026Costco Wholesale Corporation (COST) is currently in a neutral momentum posture, with an RSI-14 of 47.38. The stock is trading slightly below its 50-day moving average by 0.5% and is 10.26% off its 52-week high. This neutral reading suggests a period of consolidation after previous movements. Recent analyst commentary indicates that while Costco maintains a strong competitive advantage with its low prices and efficient distribution, challenges with renewal rates, particularly from digitally acquired members, have been noted. Despite these concerns, the company's business model, characterized by high membership renewal rates and strong sales growth, continues to be a key factor in its performance. The broader retail sector has seen varying trends, and Costco's ability to navigate these, including potential impacts from changes in gas prices, contributes to its current momentum.
Recent Overbought / Oversold Episodes
How COST behaved the last few times RSI left the neutral band — including its return over the 5 trading days after each episode ended.
| Episode | Period | Next 5 Days |
|---|---|---|
| overbought | February 6, 2026 | +1.7% |
| overbought | January 14, 2026 – January 26, 2026 | -0.9% |
| overbought | January 12, 2026 | +2.3% |
| oversold | December 22, 2025 | +1.8% |
Past behavior does not predict future results — small sample sizes especially.
Frequently Asked Questions
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Methodology
The verdict on this page is mechanical: we compute the 14-day Relative Strength Index with Wilder’s smoothing from COST’s daily closing prices, and apply the conventional thresholds — above 70 is overbought, below 30 is oversold. Moving averages, the 52-week range, and volume comparisons come from the same price history.
Indicators are recomputed after every market close. The AI commentary adds context from current news via grounded search, but never changes the computed verdict. Note: closes are as-traded; a stock split would distort readings for a few weeks until the window rolls past it.
Not Financial Advice
This page is for education and information only. Indicators are mechanical calculations, AI commentary can contain errors, and nothing here is a recommendation to buy or sell any security. Do your own research and consider consulting a qualified financial advisor. See our full disclaimer.
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