Daily provider candles; missing sessions are omitted.
Performance Across Horizons
1 day
-0.11%
From 2026-10-08
7 days
+2.85%
From 2026-10-02
1 month
+4.91%
From 2026-09-09
3 months
+3.35%
From 2026-07-10
6 months
-5.16%
From 2026-04-10
1 year
+0.43%
From 2025-10-09
Historical Records & Performance
Observed source coverage: 1986-07-09 – 2026-10-09. Records apply to this available series; they do not establish the instrument’s lifetime records. Price returns exclude distributions and fees. Yield changes use basis points.
Observed high
1,096.5
2026-05-19
Observed low
5.875
1987-12-04
Largest annual rise
+77.61%
1997
Largest annual fall
-36.77%
2002
Maximum observed closing-price drawdown: -61.72%, from 1991-08-29 to 1995-01-11. Recovery: 1997-05-09. Distance from observed high: -13.64%.
Annual OHLC & Returns
Year
Open
High
Low
Last
Return
Coverage
2026
861.14
1,096.5
852.5
946.92
+9.81%
YTD · 194 observations
2025
915
1,078.23
844.06
862.34
-5.89%
250 observations
2024
655.58
1,008.25
640.51
916.27
+38.81%
252 observations
2023
458
681.91
447.9
660.08
+44.60%
250 observations
2022
565.03
612.27
406.51
456.5
-19.59%
251 observations
2021
377.43
571.49
307
567.7
+50.67%
252 observations
2020
294.06
393.15
271.28
376.78
+28.19%
253 observations
2019
200.5
307.34
199.85
293.92
+44.28%
252 observations
2018
187.23
245.16
175.79
203.71
+9.45%
251 observations
2017
160.65
195.35
150
186.12
+16.25%
251 observations
2016
159.81
169.59
138.57
160.11
-0.86%
252 observations
2015
141.87
169.73
117.03
161.5
+13.93%
252 observations
2014
118.71
146.82
109.5
141.75
+19.10%
252 observations
2013
100.6
126.12
98.95
119.02
+20.55%
252 observations
2012
84.28
105.97
78.81
98.73
+18.49%
250 observations
2011
72.75
88.68
69.54
83.32
+15.39%
252 observations
2010
59.13
73.16
53.41
72.21
+22.04%
252 observations
2009
52.44
61.25
38.17
59.17
+12.70%
252 observations
2008
69.63
75.23
43.88
52.5
-24.74%
253 observations
2007
53.35
72.68
51.52
69.76
+31.95%
251 observations
2006
49.75
57.94
46
52.87
+6.87%
251 observations
2005
48.24
51.21
39.48
49.47
+2.19%
252 observations
2004
37.19
50.46
35.05
48.41
+30.20%
252 observations
2003
28.24
39.02
27
37.18
+32.50%
252 observations
2002
44.2
46.9
27.09
28.06
-36.77%
252 observations
2001
40
46.375
29.83
44.38
+11.12%
248 observations
2000
45.531
60.5
25.938
39.938
-12.47%
252 observations
1999
36.219
49.375
32.688
45.625
+26.41%
252 observations
1998
22.313
38.063
20.625
36.094
+61.76%
252 observations
1997
12.625
22.594
11.875
22.313
+77.61%
253 observations
1996
7.625
13
7.313
12.563
+64.75%
254 observations
1995
6.438
9.375
6
7.625
+18.45%
252 observations
1994
9.563
10.813
6.25
6.438
-33.12%
252 observations
1993
9.313
10.688
7.063
9.625
+6.21%
253 observations
1992
12.313
13.75
7.375
9.063
-27.86%
254 observations
1991
9.75
16.313
9.438
12.563
+28.03%
253 observations
1990
11.625
12.063
6.625
9.813
-15.14%
253 observations
1989
9.375
12.375
8.688
11.563
+23.33%
252 observations
1988
8.125
10.563
7.75
9.375
+14.50%
253 observations
1987
8.188
13.125
5.875
8.188
+0.00%
253 observations
1986
10.688
11.125
7.063
8.188
-23.39%
Initial partial period · 123 observations
Changes use the previous period’s last observation; the first partial period uses its first observed opening value. Missing sessions remain missing.
Monthly Seasonality
Historical monthly price returns, not a forecast. Median: +1.32%. Longest rising streak: 6 months; falling streak: 5 months.
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
2026
+9.03%
+7.50%
-1.42%
+1.82%
-5.74%
-2.18%
+1.76%
-0.84%
-3.55%
+4.02%
—
—
2025
+6.94%
+7.01%
-9.81%
+5.15%
+4.59%
-4.83%
-5.08%
+0.39%
-1.88%
-1.53%
+0.23%
-5.61%
2024
+5.27%
+7.05%
-1.51%
-1.33%
+12.03%
+4.95%
-3.29%
+8.56%
-0.66%
-1.39%
+11.18%
-5.72%
2023
+11.97%
-5.27%
+2.62%
+1.28%
+1.66%
+5.24%
+4.14%
-2.03%
+2.85%
-2.22%
+7.29%
+11.36%
2022
-11.02%
+2.80%
+10.90%
-7.66%
-12.32%
+2.80%
+12.94%
-3.55%
-9.54%
+6.19%
+7.53%
-15.35%
2021
-6.46%
-6.08%
+6.49%
+5.56%
+1.66%
+4.60%
+8.61%
+6.00%
-1.35%
+9.39%
+9.73%
+5.25%
2020
+3.95%
-7.98%
+1.42%
+6.27%
+1.81%
-1.71%
+7.36%
+6.80%
+2.11%
+0.74%
+9.55%
-3.83%
2019
+5.36%
+1.91%
+10.70%
+1.40%
-2.42%
+10.30%
+4.30%
+6.94%
-2.26%
+3.12%
+0.91%
-1.96%
2018
+4.70%
-2.04%
-1.29%
+4.63%
+0.55%
+5.42%
+4.66%
+6.59%
+0.75%
-2.66%
+1.16%
-11.92%
2017
+2.40%
+8.07%
-5.36%
+5.86%
+1.64%
-11.36%
-0.89%
-1.12%
+4.82%
-1.95%
+14.50%
+0.92%
2016
-6.43%
-0.72%
+5.03%
-6.00%
+0.43%
+5.56%
+6.48%
-3.07%
-5.91%
-3.04%
+1.51%
+6.66%
2015
+0.87%
+2.78%
+3.09%
-5.58%
-0.32%
-5.28%
+7.58%
-3.61%
+3.23%
+9.37%
+2.09%
+0.05%
2014
-5.60%
+3.95%
-4.38%
+3.58%
+0.29%
-0.74%
+2.07%
+3.01%
+3.50%
+6.42%
+6.56%
-0.26%
2013
+3.66%
-1.03%
+4.76%
+2.19%
+1.11%
+0.86%
+6.20%
-4.73%
+2.95%
+2.46%
+6.30%
-5.11%
2012
-1.26%
+4.61%
+5.51%
-2.89%
-2.03%
+9.97%
+1.24%
+1.76%
+2.34%
-1.73%
+5.58%
-4.99%
2011
-0.51%
+4.11%
-1.97%
+10.32%
+1.97%
-1.50%
-3.68%
+0.37%
+4.57%
+1.36%
+2.46%
-2.32%
2010
-2.94%
+6.16%
-2.07%
-1.06%
-1.40%
-5.87%
+3.43%
-0.37%
+14.14%
-2.67%
+7.71%
+6.80%
2009
-14.23%
-5.97%
+9.40%
+4.92%
-0.16%
-5.65%
+8.13%
+2.99%
+10.59%
+0.83%
+5.38%
-1.24%
2008
-2.61%
-8.86%
+4.93%
+9.67%
+0.10%
-1.65%
-10.64%
+6.99%
-3.18%
-12.20%
-9.72%
+2.00%
2007
+6.22%
-0.48%
-3.67%
-0.50%
+5.41%
+3.63%
+2.19%
+3.26%
-0.62%
+9.60%
+0.21%
+3.50%
2006
+0.85%
+2.61%
+5.80%
+0.50%
-2.76%
+7.94%
-7.65%
-11.32%
+6.18%
+7.45%
-2.02%
+1.09%
2005
-2.35%
-1.44%
-5.17%
-8.04%
+11.69%
-1.43%
+2.77%
-5.59%
-0.71%
+12.25%
+3.27%
-0.96%
2004
-0.65%
+5.20%
-3.22%
-0.29%
+1.07%
+8.65%
-1.14%
+1.13%
+0.83%
+15.49%
+1.38%
-0.39%
2003
+2.89%
+5.72%
-1.61%
+15.25%
+7.63%
-1.74%
+1.07%
-12.81%
-3.41%
+13.80%
+1.04%
+3.80%
2002
+3.65%
-10.30%
-3.49%
+0.95%
-2.31%
-1.66%
-9.71%
-4.19%
-3.11%
+4.82%
-4.80%
-13.13%
2001
+15.81%
-9.73%
-5.99%
-11.01%
+11.39%
+5.58%
+4.80%
-13.10%
-4.95%
+6.38%
+8.06%
+8.56%
2000
+7.26%
+1.40%
+5.92%
+2.85%
-40.92%
+3.33%
-1.33%
+5.76%
+1.45%
+4.83%
-10.92%
+22.41%
1999
+14.81%
-3.09%
+14.01%
-11.60%
-10.42%
+10.43%
-6.64%
+0.00%
-3.68%
+11.55%
+14.16%
-0.48%
1998
-2.80%
+12.68%
+9.21%
+4.68%
+3.58%
+8.96%
-10.01%
-17.07%
+0.66%
+19.79%
+10.57%
+15.04%
1997
+5.97%
-3.76%
+7.80%
+4.52%
+16.88%
-2.59%
+15.21%
-4.79%
+4.33%
+2.33%
+15.10%
+0.71%
1996
+2.46%
+10.40%
+8.70%
+1.33%
+5.26%
+8.13%
-5.20%
-3.05%
+3.14%
-3.05%
+16.98%
+8.06%
1995
+6.80%
-0.91%
+8.26%
-0.85%
-3.42%
+15.04%
+10.38%
-5.92%
+1.48%
-0.73%
-2.21%
-8.27%
1994
-7.79%
+12.68%
-9.38%
-16.55%
-12.40%
+12.74%
+0.42%
+4.58%
+2.39%
-1.95%
-2.38%
-16.26%
1993
+3.45%
-10.67%
-0.75%
-12.78%
+0.86%
+16.24%
-6.62%
+19.69%
-0.33%
-6.27%
+7.75%
+0.65%
1992
-8.96%
+18.03%
-12.96%
-35.11%
+10.66%
-2.22%
+3.03%
-9.56%
+4.07%
+10.16%
+10.64%
-7.05%
1991
+13.38%
-7.02%
+12.99%
+9.09%
+8.82%
-2.70%
+0.93%
+16.51%
-5.12%
-1.24%
-6.30%
-9.87%
1990
-14.86%
-2.86%
+1.31%
-11.61%
+12.04%
+8.14%
-3.61%
-16.87%
-12.03%
+6.84%
+22.40%
+2.61%
1989
+0.00%
-1.33%
-2.03%
+12.41%
+9.20%
-10.11%
+9.38%
+1.71%
-3.37%
+2.62%
+5.95%
-1.07%
1988
+8.78%
+12.28%
-6.25%
+1.33%
-4.61%
+5.52%
-7.84%
+4.61%
+5.08%
+3.23%
-1.88%
-4.46%
1987
+18.70%
+13.83%
+8.47%
-11.46%
+1.76%
+3.76%
+6.41%
+4.71%
-7.50%
-32.97%
-12.90%
+21.30%
1986
—
—
—
—
—
—
-5.85%
-9.32%
-6.16%
+5.11%
+0.00%
-9.03%
Median
+2.67%
+1.66%
+1.36%
+1.31%
+1.09%
+3.48%
+1.91%
+0.00%
+0.66%
+2.54%
+4.32%
-0.43%
Observed History Timeline
Milestones are calculated from this instrument’s source series. They are not claims about news causing a price move.
USD / share. Daily provider OHLC; last session may be in progress. Dates use UTC candle-open timestamps and can differ from local trading-session dates.
Date
Open
High
Low
Close
Change
2026-10-09
945
951.29
942.53
946.92
-0.11%
2026-10-08
952.92
953.25
939.6
947.92
+0.60%
2026-10-07
940.84
948.77
937.6
942.25
+0.70%
2026-10-06
921.32
937.04
919
935.68
+1.32%
2026-10-05
920
925.34
914.75
923.52
+0.31%
2026-10-02
921.18
921.18
909.66
920.65
+0.62%
2026-10-01
910.87
923.5
903.78
914.94
+0.51%
2026-09-30
924.61
925.56
910.3
910.34
-1.54%
2026-09-29
916.8
925.97
912.66
924.59
+0.18%
2026-09-28
924.39
931.09
913
922.92
+0.02%
2026-09-25
887
925.14
883.1
922.77
+2.93%
2026-09-24
908.81
909.43
895.26
896.48
-0.91%
2026-09-23
901.31
905.59
893.36
904.7
+0.59%
2026-09-22
902.26
903.4
895.84
899.41
+0.10%
2026-09-21
891.07
899.44
885.5
898.48
+0.35%
2026-09-18
892.43
898.4
890.55
895.31
+0.15%
2026-09-17
895.32
896
888.04
893.93
+0.02%
2026-09-16
901.05
902
892.67
893.74
-0.84%
2026-09-15
916.92
916.92
900.25
901.35
-1.91%
2026-09-14
913.65
921.99
910.79
918.91
+1.56%
2026-09-11
905.17
907.36
900.75
904.77
+0.26%
2026-09-10
906.62
912.1
899
902.38
-0.02%
2026-09-09
907
909.23
898.43
902.6
-0.83%
2026-09-08
912.4
915.13
906.1
910.18
-0.61%
2026-09-04
926.09
928.04
914.54
915.74
-1.04%
2026-09-03
927.79
930.76
915.31
925.41
-0.33%
2026-09-02
938.49
938.88
920.31
928.48
-1.22%
2026-09-01
947.35
952.1
935.93
939.96
-0.42%
2026-08-31
945.19
949.3
940.71
943.89
-0.17%
2026-08-28
938.94
953.73
937.11
945.47
+1.16%
Page 1 / 339 · 10142 observations
Historical Amount Comparison
Reference at 1986-07-09: 11. Equivalent latest reference value: 86,083.64 (+8508.36%).
Uses the last observation on or before the chosen date. Positive reference prices are required for amount comparisons. Excludes fees, dividends, interest and tax. Index results represent hypothetical proportional exposure.
∿
Verified market data
Data & Forecast Methodology
How the source reference becomes the displayed data, indicators and planning scenarios.
Market data + short-term model1
One reference across every page
Quote, history, forecast and calculators use the same Yahoo Finance chart snapshot. Source observation time and automated check time are shown separately. Price changes use the previous completed observation. Bond moves are basis points; index values are points.
2
Source boundaries
Yahoo Finance supplies the named instrument reference and daily OHLC history. No placeholder catalogue prices, synthetic candles, or fabricated fundamentals are used.
3
Short-term statistical model
25%-shrunk 60/40 blend of 30/90-session mean log-return drift with a model-implied central 80% lognormal interval from 30-session realized volatility; constant-volatility assumption, not empirically calibrated coverage Intervals are not calibrated empirical coverage; jumps, fat tails and parameter uncertainty are excluded.
4
Signals and refresh
Indicators use completed daily observations and require 200 samples. Composite = (Buy − Sell) / rule count: Strong Buy above 0.55; Buy above 0.15; Neutral above −0.15; Sell above −0.55; otherwise Strong Sell. Each browser checks every 60 seconds; provider snapshots are cached for up to five minutes. Failed refreshes are visibly marked.
Long-term scenarios + controls5
One scenario anchor
Every planning band uses the same timestamped reference displayed above. Changing the annual assumption updates the scenario chart, yearly bands and regular-contribution calculations.
6
Explicit planning assumptions
Lower and upper paths apply the selected annual change in opposite directions. The base path keeps the reference unchanged. These paths have no assigned probabilities and are separate from the short-term statistical model.
7
Market-specific interpretation
Prices use the instrument’s quoted units; indices use points and yield moves use basis points. Fees, taxes and distributions are excluded. A yield path cannot estimate a bond investment return.
Read as a range: short-term estimates and long-term planning scenarios can fall outside every displayed band. Source gaps and unsupported calculations are withheld.
Costco Price History FAQ
How much history is available?
The source span and observation count are shown above. Missing dates are omitted. Records refer to available source coverage, not the instrument’s entire lifetime.
How are changes and conversions calculated?
Price changes compare observed reference values. Yield moves use basis points. Conversion amounts use the same timestamped source rate; spreads, fees and distributions are excluded.
A share reference represents a company equity instrument. Investment returns also depend on corporate actions and dividends. The source instrument is COST, quoted as USD / share, with daily history.
Source quality: Single instrument provider for quote and OHLC history. The displayed check time is separate from the market observation time. Missing fundamentals are not estimated.