We can't tell you what to do with your money — that depends on your goals, your timeline and what you already own. Here is what Costco's own price history says.
COST closed at $994.61 on Oct 20, 2026, up 10.7% over the past month. It sits 9.1% below its 52-week high, the trend is mixed, momentum looks stretched (RSI-14 90), and a typical day moves it about 1.1%.
| Last close | $994.61 (Oct 20, 2026) |
| 52-week range (closes) | $850.00 – $1,094.32 |
| From the 52-week high | -9.1% |
| Trend (50- / 200-day averages) | Mixed · 50-day $935.58 · 200-day $967.49 |
| Momentum (RSI-14) | 90 · Possibly overheated (above 70) |
| Typical daily move | 1.1% |
| Price change | COST | S&P 500 (SPY) | Difference |
|---|---|---|---|
| 1 day | -0.1% | — | — |
| 1 month | +10.7% | — | — |
| 3 months | +7.0% | — | — |
| 6 months | -1.1% | — | — |
| 1 year | +6.2% | — | — |
Close to close, price only. "1 month" is measured from the close nearest 30 days earlier (3 months 91, 6 months 182, 1 year 365); the typical daily move is the standard deviation of daily changes over the last 3 months. Data as of the Oct 20, 2026 close.
Over 15 years of monthly closes (Nov 2011 – Sep 2026, dividends included), COST's strongest month has been November (higher in 15 of 15 years, average +5.9%) and its weakest December (lower in 9 of 15 years, average -1.4%). Passing our test for a tendency (up in at least 70% of years, or down in at least 60%): July (up 12 of 15), November (up 15 of 15), December (down 9 of 15). Tendencies, not guarantees.
| Month | Average | Median | Up in | Years | Tendency |
|---|---|---|---|---|---|
| January | +1.6% | +3.7% | 67% | 15 | — |
| February | +1.9% | +3.0% | 60% | 15 | — |
| March | +1.8% | +2.6% | 60% | 15 | — |
| April | +1.0% | +1.8% | 67% | 15 | — |
| May | +0.6% | +0.8% | 67% | 15 | — |
| June | +1.6% | +2.8% | 60% | 15 | — |
| July | +4.0% | +4.3% | 80% | 15 | Leans up |
| August | +1.6% | +0.5% | 53% | 15 | — |
| September | -0.2% | +0.8% | 53% | 15 | — |
| Octoberthis month | +1.7% | -0.2% | 50% | 14 | — |
| Novembernext month | +5.9% | +6.6% | 100% | 15 | Leans up |
| December | -1.4% | -1.3% | 40% | 15 | Leans down |
Each month's change is its close against the month before, from dividend-adjusted monthly closes; "up in" is the share of years it closed higher.
We haven't picked COST yet. Our daily picks come from a screen of the 64 large US stocks and funds we follow, COST included, looking for established companies in an orderly pullback; an AI analyst review can veto any of them before the top-ranked few are published. Every published pick is graded a week and a month later against the S&P 500 on the track record, losses included.
From Oct 21, 2026 to Nov 20, 2026. Dates marked approx. follow the usual schedule and can shift by a few days.
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