Costco (COST) — Daily Price Character
Historical session stats from dividend-adjusted prices: win rate, streaks, record days, weekday patterns, and (when available) how often the stock was green on S&P 500 green days.
COST
Archetype
Balanced
Moderate daily swings — neither calm nor dramatic.
Win rate
49.2%
4926 green · 4652 red · 434 flat · 10012 sessions
Current streak
1 red
As of Apr 7, 2026
Max win / lose streak
14 / 9 days
Win streak return: +11.59% · Lose: 8.50%
Median / σ daily
+0.000% · 2.050%
Avg green +1.51% · avg red 1.41%
Extreme days (>3%)
11.2%
628 up · 496 down
History from Jul 10, 1986 through Apr 7, 2026 · 10012 trading days with returns.
Trailing year — daily returns (calendar)
Apr 8, 2025 – Apr 7, 2026 · Mon–Fri sessions only
Monday–Friday — average return
Average dividend-adjusted return on that weekday (green / red by sign). Green/red day rule: ±0.01% vs prior close.
Monday–Friday — win rate
Share of sessions that closed green on that weekday. Bars are green at or above 50%, red below 50%.
Top green days
Largest single-session gains (dividend-adjusted), by historical return.
| Date | Return |
|---|---|
| Mar 15, 2000 | +14.99% |
| Oct 29, 1987 | +14.42% |
| Dec 30, 1987 | +13.60% |
| Nov 7, 1986 | +12.90% |
| Mar 16, 2000 | +12.34% |
| Nov 5, 1987 | +11.81% |
| Feb 11, 1988 | +11.76% |
| Jun 16, 1993 | +11.68% |
| Sep 8, 1998 | +11.34% |
| Sep 3, 1998 | +10.86% |
| Oct 28, 2008 | +10.76% |
| Apr 15, 1987 | +10.69% |
| Aug 24, 1990 | +10.67% |
| Feb 19, 1988 | +10.57% |
| Mar 16, 1988 | +10.53% |
| Oct 13, 2008 | +10.44% |
| Mar 2, 2020 | +9.96% |
| Jan 5, 1988 | +9.90% |
| Jul 24, 2002 | +9.78% |
| Aug 13, 1986 | +9.42% |
Worst red days
Largest single-session losses; "Days to recovery" counts trading sessions until close recovered the prior peak (dividend-adjusted).
| Date | Return | Days to recovery |
|---|---|---|
| Oct 26, 1987 | 22.52% | 4 |
| May 24, 2000 | 21.54% | 153 |
| Aug 5, 2003 | 18.69% | 101 |
| Oct 19, 1987 | 12.70% | 54 |
| May 18, 2022 | 12.45% | 32 |
| Jul 23, 2008 | 11.90% | 601 |
| Jun 5, 1992 | 11.85% | 1253 |
| Dec 22, 1992 | 11.57% | 1010 |
| Aug 31, 1998 | 11.29% | 5 |
| Dec 4, 1987 | 11.27% | 19 |
| Oct 20, 1987 | 10.56% | 12 |
| Nov 30, 2000 | 10.47% | 12 |
| Dec 19, 1995 | 10.09% | 11 |
| Mar 7, 2000 | 9.47% | 7 |
| Sep 2, 1998 | 9.43% | 1 |
| Dec 7, 1987 | 9.30% | 6 |
| Sep 10, 1986 | 8.89% | 42 |
| Apr 22, 2005 | 8.75% | 18 |
| Aug 25, 1992 | 8.60% | 5 |
| Dec 14, 2018 | 8.58% | 56 |
Frequently asked questions
What is the daily win rate for Costco (COST)?
- Historically, Costco (COST) closed green on 49.2% of trading days (4926 green, 4652 red, 434 flat), using dividend-adjusted closes and a ±0.01% threshold for green vs red.
What is the current winning or losing streak for Costco (COST)?
- As of 2026-04-07, Costco (COST) is on a 1-day losing streak (consecutive green or red days by the same rules, ignoring trailing flat days).
What does Steady, Balanced, or Explosive mean for Costco (COST)?
- We label Costco (COST) as "balanced" based on the sample standard deviation of daily returns: Moderate daily swings — neither calm nor dramatic.
What were the best and worst single trading days for Costco (COST)?
- Largest single-day gain: +14.99%. Largest single-day loss: 22.52%. Tables on this page list the top record green and red days.
What counts as an "extreme" daily move for Costco (COST)?
- We treat a day as extreme if the absolute dividend-adjusted daily return exceeds 3%. About 11.2% of trading days for Costco (COST) were extreme (628 up, 496 down).
Data & methodology
How are green, red, and flat days defined?
- We use dividend-adjusted (or close-to-close for non-equity) daily returns. Green: return ≥ +0.01%. Red: return ≤ −0.01%. Flat: between those bounds.
How is the current streak calculated?
- We count consecutive green or consecutive red days using the same thresholds. If the most recent session is flat, we skip trailing flat days and measure from the last non-flat close.
What does “vs S&P 500” mean?
- On sessions where the S&P 500 (^GSPC) was green, we report how often this stock was also green. Shown only for USD equities when benchmark data exists and the symbol is not the index itself.
Where does the archetype come from?
- Sample standard deviation of daily returns: low → Steady, high → Explosive, otherwise Balanced. Labels describe typical daily volatility, not quality of the investment.