COSTCO WHSL CORP NEW

Ticker: COST CUSIP: 22160K105 Class: COM

Chesley Taft & Associates LLC's Holding History (CIK: 0001164632)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 68,667 Value ($000) $59,214 Avg Close $905.73 Range $844.06 - $962.64

Q3 2025

Shares 65,859 Value ($000) $60,961 Avg Close $956.70 Range $902.01 - $997.89

Q2 2025

Shares 67,863 Value ($000) $67,180 Avg Close $990.72 Range $868.14 - $1064.10

Q1 2025

Shares 68,488 Value ($000) $64,775 Avg Close $970.56 Range $877.95 - $1073.82

Q4 2024

Shares 69,451 Value ($000) $63,636 Avg Close $922.64 Range $861.51 - $1003.02

Q3 2024

Shares 70,791 Value ($000) $62,758 Avg Close $861.91 Range $787.84 - $917.81

Q2 2024

Shares 72,903 Value ($000) $61,967 Avg Close $773.82 Range $690.64 - $867.04

Q1 2024

Shares 74,215 Value ($000) $54,372 Avg Close $706.75 Range $633.49 - $779.59

Q4 2023

Shares 75,837 Value ($000) $50,058 Avg Close $573.49 Range $521.47 - $661.25

Q3 2023

Shares 65,290 Value ($000) $36,886 Avg Close $532.21 Range $505.45 - $552.31

Q2 2023

Shares 65,433 Value ($000) $35,228 Avg Close $487.14 Range $459.09 - $519.84

Q1 2023

Shares 65,483 Value ($000) $32,537 Avg Close $471.27 Range $429.88 - $509.61

Q4 2022

Shares 65,688 Value ($000) $29,987 Avg Close $468.77 Range $430.19 - $520.75

Q3 2022

Shares 66,152 Value ($000) $31,242 Avg Close $498.08 Range $444.08 - $541.06

Q2 2022

Shares 66,516 Value ($000) $31,880 Avg Close $484.91 Range $388.78 - $584.62

Q1 2022

Shares 87,002 Value ($000) $50,579 Avg Close $500.83 Range $447.15 - $559.84

Q4 2021

Shares 88,317 Value ($000) $50,138 Avg Close $488.10 Range $415.17 - $544.86

Q3 2021

Shares 87,767 Value ($000) $39,438 Avg Close $418.22 Range $374.22 - $447.84

Q2 2021

Shares 87,794 Value ($000) $34,737 Avg Close $359.04 Range $333.36 - $380.48

Q1 2021

Shares 89,154 Value ($000) $32,169 Avg Close $329.77 Range $291.05 - $361.01

Q4 2020

Shares 91,421 Value ($000) $34,446 Avg Close $347.39 Range $324.71 - $367.18

Q3 2020

Shares 94,279 Value ($000) $33,469 Avg Close $309.06 Range $276.17 - $334.67

Q2 2020

Shares 95,394 Value ($000) $28,924 Avg Close $279.18 Range $257.36 - $295.59

Q1 2020

Shares 95,645 Value ($000) $27,271 Avg Close $277.78 Range $248.54 - $298.00

Q4 2019

Shares 101,120 Value ($000) $29,721 Avg Close $271.52 Range $256.90 - $280.77

Q3 2019

Shares 101,390 Value ($000) $29,211 Avg Close $256.34 Range $238.19 - $280.38

Q2 2019

Shares 101,966 Value ($000) $26,946 Avg Close $226.60 Range $212.14 - $244.81

Q1 2019

Shares 102,601 Value ($000) $24,844 Avg Close $198.35 Range $180.94 - $220.09

Q4 2018

Shares 102,924 Value ($000) $20,967 Avg Close $201.98 Range $171.58 - $217.57

Q3 2018

Shares 103,669 Value ($000) $24,350 Avg Close $203.13 Range $185.65 - $221.43

Q2 2018

Shares 103,729 Value ($000) $21,677 Avg Close $177.76 Range $162.55 - $191.42

Q1 2018

Shares 103,441 Value ($000) $19,491 Avg Close $169.26 Range $157.50 - $179.09

Q4 2017

Shares 103,061 Value ($000) $19,182 Avg Close $154.45 Range $137.67 - $175.03

Q3 2017

Shares 102,736 Value ($000) $16,878 Avg Close $140.12 Range $133.57 - $147.68

Q2 2017

Shares 89,301 Value ($000) $14,282 Avg Close $150.98 Range $139.41 - $162.71

Q1 2017

Shares 87,971 Value ($000) $14,752 Avg Close $142.87 Range $134.91 - $152.51

Q4 2016

Shares 88,276 Value ($000) $14,134 Avg Close $129.79 Range $120.95 - $140.39

Q3 2016

Shares 88,686 Value ($000) $13,526 Avg Close $136.95 Range $124.90 - $143.90

Q2 2016

Shares 86,472 Value ($000) $13,580 Avg Close $128.04 Range $117.26 - $134.37

Q1 2016

Shares 80,992 Value ($000) $12,763 Avg Close $127.74 Range $119.17 - $135.67

Q4 2015

Shares 37,537 Value ($000) $6,062 Avg Close $132.84 Range $119.34 - $142.82

Q3 2015

Shares 39,972 Value ($000) $5,779 Avg Close $119.60 Range $98.22 - $123.53

Q2 2015

Shares 38,862 Value ($000) $5,249 Avg Close $120.23 Range $112.77 - $127.67

Q1 2015

Shares 38,622 Value ($000) $5,851 Avg Close $120.91 Range $111.40 - $128.73

Q4 2014

Shares 39,305 Value ($000) $5,571 Avg Close $109.42 Range $98.12 - $118.34

Q3 2014

Shares 38,000 Value ($000) $4,762 Avg Close $97.13 Range $92.09 - $102.72

Q2 2014

Shares 36,365 Value ($000) $4,188 Avg Close $91.81 Range $88.18 - $95.25

Q1 2014

Shares 36,032 Value ($000) $4,024 Avg Close $91.29 Range $87.26 - $95.07

Q4 2013

Shares 34,924 Value ($000) $4,157 Avg Close $95.15 Range $87.55 - $100.50

Q3 2013

Shares 34,560 Value ($000) $3,980 Avg Close $91.64 Range $87.25 - $95.29

Q2 2013

Shares 34,360 Value ($000) $3,799 Avg Close $86.56 Range $81.59 - $91.78

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	68,667	$59,214	$905.73	$844.06 - $962.64
Q3 2025	65,859	$60,961	$956.70	$902.01 - $997.89
Q2 2025	67,863	$67,180	$990.72	$868.14 - $1064.10
Q1 2025	68,488	$64,775	$970.56	$877.95 - $1073.82
Q4 2024	69,451	$63,636	$922.64	$861.51 - $1003.02
Q3 2024	70,791	$62,758	$861.91	$787.84 - $917.81
Q2 2024	72,903	$61,967	$773.82	$690.64 - $867.04
Q1 2024	74,215	$54,372	$706.75	$633.49 - $779.59
Q4 2023	75,837	$50,058	$573.49	$521.47 - $661.25
Q3 2023	65,290	$36,886	$532.21	$505.45 - $552.31
Q2 2023	65,433	$35,228	$487.14	$459.09 - $519.84
Q1 2023	65,483	$32,537	$471.27	$429.88 - $509.61
Q4 2022	65,688	$29,987	$468.77	$430.19 - $520.75
Q3 2022	66,152	$31,242	$498.08	$444.08 - $541.06
Q2 2022	66,516	$31,880	$484.91	$388.78 - $584.62
Q1 2022	87,002	$50,579	$500.83	$447.15 - $559.84
Q4 2021	88,317	$50,138	$488.10	$415.17 - $544.86
Q3 2021	87,767	$39,438	$418.22	$374.22 - $447.84
Q2 2021	87,794	$34,737	$359.04	$333.36 - $380.48
Q1 2021	89,154	$32,169	$329.77	$291.05 - $361.01
Q4 2020	91,421	$34,446	$347.39	$324.71 - $367.18
Q3 2020	94,279	$33,469	$309.06	$276.17 - $334.67
Q2 2020	95,394	$28,924	$279.18	$257.36 - $295.59
Q1 2020	95,645	$27,271	$277.78	$248.54 - $298.00
Q4 2019	101,120	$29,721	$271.52	$256.90 - $280.77
Q3 2019	101,390	$29,211	$256.34	$238.19 - $280.38
Q2 2019	101,966	$26,946	$226.60	$212.14 - $244.81
Q1 2019	102,601	$24,844	$198.35	$180.94 - $220.09
Q4 2018	102,924	$20,967	$201.98	$171.58 - $217.57
Q3 2018	103,669	$24,350	$203.13	$185.65 - $221.43
Q2 2018	103,729	$21,677	$177.76	$162.55 - $191.42
Q1 2018	103,441	$19,491	$169.26	$157.50 - $179.09
Q4 2017	103,061	$19,182	$154.45	$137.67 - $175.03
Q3 2017	102,736	$16,878	$140.12	$133.57 - $147.68
Q2 2017	89,301	$14,282	$150.98	$139.41 - $162.71
Q1 2017	87,971	$14,752	$142.87	$134.91 - $152.51
Q4 2016	88,276	$14,134	$129.79	$120.95 - $140.39
Q3 2016	88,686	$13,526	$136.95	$124.90 - $143.90
Q2 2016	86,472	$13,580	$128.04	$117.26 - $134.37
Q1 2016	80,992	$12,763	$127.74	$119.17 - $135.67
Q4 2015	37,537	$6,062	$132.84	$119.34 - $142.82
Q3 2015	39,972	$5,779	$119.60	$98.22 - $123.53
Q2 2015	38,862	$5,249	$120.23	$112.77 - $127.67
Q1 2015	38,622	$5,851	$120.91	$111.40 - $128.73
Q4 2014	39,305	$5,571	$109.42	$98.12 - $118.34
Q3 2014	38,000	$4,762	$97.13	$92.09 - $102.72
Q2 2014	36,365	$4,188	$91.81	$88.18 - $95.25
Q1 2014	36,032	$4,024	$91.29	$87.26 - $95.07
Q4 2013	34,924	$4,157	$95.15	$87.55 - $100.50
Q3 2013	34,560	$3,980	$91.64	$87.25 - $95.29
Q2 2013	34,360	$3,799	$86.56	$81.59 - $91.78