COST

Costco Wholesale Corporation $918.91 1M -4.5% 3M -6.5% YTD +7.5% as of 2026-09-14
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Model view — historical tendencies for the days ahead, not a forecast
Next 1 day
+0.1%
Next 1 week
-0.3%
Next 1 month
+0.7%
Seasonality
Mildly positive window
Next 30 days (to Oct 15): +2.8% median, 54% of the last 39 years finished up.
20-year seasonality chart →
Mean reversion
Overbought — RSI(2) at 89
RSI(2) under 15 is oversold (this name has historically bounced); over 85 is overbought. Its dip-buy edge in history is +0.00%/day.
Mean-reversion stats →
1-month breakdown — Market · β -0.15 +0.1% · Seasonal tilt +0.6%
$407.1B market cap (#21 US) $1.8B/day volume 20% volatility -5% 1-year -16% from ATH
52-week range · 30% of the way up · -16% from the high
$844.06$1096.50

Congressional trades in COST Full tracker →

59 members · 123 buys / 93 sells · $1.5M–$6.1M disclosed · latest filing Aug 14, 2026.

SELL RM Richard Dean McCormick · traded Jul 30, 2026 $1K–$15K
BUY AA Alan Armstrong · traded Mar 27, 2026 $1K–$15K
BUY DN Dan Newhouse · traded Jul 10, 2026 $1K–$15K
BUY GC Gilbert Cisneros · traded Jan 30, 2026 $1K–$15K
BUY MM Markwayne Mullin · traded Dec 29, 2025 $15K–$50K
SELL GC Gilbert Cisneros · traded Dec 24, 2025 $1K–$15K
BUY RM Richard Dean McCormick · traded Nov 5, 2025 $1K–$15K
BUY GC Gilbert Cisneros · traded Oct 17, 2025 $1K–$15K

Earnings Full history →

Next report 2026-09-24 (Thursday, after close, in 9 days) · EPS est. 6.55.

1-day std dev
3.1%
Finished up
45%
Biggest pop
+6.6%
Biggest drop
-8.6%

Standard deviation of the close-to-close move over the last 60 reports. History, not a forecast.

Data from the U.S. House Clerk and FINRA, plus end-of-day prices. Not investment advice.