Is Costco Wholesale Corporation Stock (COST) Overbought or Oversold?
RSI analysis computed from COST's daily closing prices · Data through October 15, 2026
As of October 15, 2026, COST’s 14-day RSI is 69.4, inside the neutral 30–70 band — neither overbought nor oversold by the conventional thresholds.
RSI-14 Scale
COST reads 69.4 on the 0–100 scale.
The Supporting Picture
vs 50-Day MA
+4.8%
MA: $932.94
vs 200-Day MA
+4.2%
MA: $938.17
From 52-Wk High
-4.0%
High: $1018.48
Volume vs 20-Day Avg
-66%
Avg: 1.6M shares
The 50-day average is currently below the 200-day average, which technicians read as a longer-term downtrend backdrop for the RSI reading above.
What's Behind the Reading
October 15, 2026Costco's stock is currently trading at $977.89, exhibiting strong performance by being 4.8% above its 50-day moving average and within 3.99% of its 52-week high. This upward trajectory has resulted in an RSI-14 of 69.43, which is currently categorized as neutral. Recent news highlights robust sales momentum, with Costco reporting a 13% rise in September sales and a notable 19% growth in digital sales, indicating healthy consumer demand and effective operational strategies. These consistently positive sales figures, coupled with the company's strong standing in the retail sector, plausibly contribute to the stock's current momentum posture, reflecting sustained investor confidence in its business model and market position.
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 | October 14, 2026 | — |
| overbought | February 6, 2026 | +1.7% |
| overbought | January 14, 2026 – January 26, 2026 | -0.9% |
| overbought | January 12, 2026 | +2.3% |
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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