Is Costco Wholesale Corporation Stock (COST) Overbought or Oversold?

RSI analysis computed from COST's daily closing prices · Data through July 17, 2026

Neutral Updated after each market close

As of July 17, 2026, COST’s 14-day RSI is 46.1, inside the neutral 30–70 band — neither overbought nor oversold by the conventional thresholds.

RSI-14 Scale

0 · Oversold305070100 · Overbought

COST reads 46.1 on the 0–100 scale.

The Supporting Picture

vs 50-Day MA

-3.6%

MA: $976.15

vs 200-Day MA

-0.4%

MA: $944.57

From 52-Wk High

-11.0%

High: $1056.85

Volume vs 20-Day Avg

+23%

Avg: 1.5M 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

July 17, 2026

Costco's RSI-14 stands at 46.14, indicating a neutral momentum. The stock is currently trading 3.6% below its 50-day moving average and is down 10.98% from its 52-week high. This neutral posture follows strong Q3 2026 earnings reported in late May 2026. During that quarter, net sales increased by 11.6% year-over-year to $69.15 billion, and diluted EPS rose to $4.93. The company experienced record-breaking gas volume sales, which helped attract new members, and saw robust digital sales growth of 21.5%. Despite these positive results, the stock's current position below its 50-day MA and 52-week high suggests the market may be consolidating or factoring in broader retail sector dynamics.

Sources

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	Length	Peak RSI	Next 5 Days
overbought	February 6, 2026	1 day	70.1	+1.7%
overbought	January 14, 2026 – January 26, 2026	8 days	78.3	-0.9%
overbought	January 12, 2026	1 day	70.5	+2.3%
oversold	December 22, 2025	1 day	29.6	+1.8%

Past behavior does not predict future results — small sample sizes especially.

Frequently Asked Questions

Is Costco Wholesale Corporation (COST) overbought right now?

Based on the latest close, COST's 14-day RSI is 46.1, which is in neutral territory — neither overbought nor oversold. RSI above 70 is considered overbought; below 30, oversold. This is recalculated every trading day.

What is RSI (Relative Strength Index)?

RSI measures the speed and size of recent price changes on a 0–100 scale over 14 trading days, using Wilder's smoothing. Readings above 70 suggest a stock has risen quickly relative to its recent range; below 30, fallen quickly.

Is an overbought stock a sell signal?

Not by itself. Strong stocks can stay overbought for weeks during uptrends, and oversold stocks can keep falling. Most traders combine RSI with trend context — like the 50- and 200-day moving averages shown above — plus volume and fundamentals rather than acting on RSI alone.

How often is this page updated?

Indicators are recomputed after every market close from daily closing prices, and the AI commentary refreshes each trading evening. The data date shown above is July 17, 2026.

Where does this data come from?

Daily closing prices come from our market data feed, and every indicator on this page is computed directly by us from that price history. The overbought/oversold verdict is a mechanical calculation, not an opinion.

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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