COSTCO WHSL CORP NEW

Ticker: COST CUSIP: 22160K105 Class: COM

MOUNT VERNON ASSOCIATES INC /MD/'s Holding History (CIK: 0000799003)

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

Q4 2025

Shares 9,732 Value ($000) $8 Avg Close $905.73 Range $844.06 - $962.64

Q3 2025

Shares 9,737 Value ($000) $9 Avg Close $956.70 Range $902.01 - $997.89

Q2 2025

Shares 9,905 Value ($000) $10 Avg Close $990.72 Range $868.14 - $1064.10

Q1 2025

Shares 10,037 Value ($000) $9 Avg Close $970.56 Range $877.95 - $1073.82

Q4 2024

Shares 10,093 Value ($000) $9 Avg Close $922.64 Range $861.51 - $1003.02

Q3 2024

Shares 10,107 Value ($000) $9 Avg Close $861.91 Range $787.84 - $917.81

Q2 2024

Shares 9,882 Value ($000) $8 Avg Close $773.82 Range $690.64 - $867.04

Q1 2024

Shares 10,459 Value ($000) $8 Avg Close $706.75 Range $633.49 - $779.59

Q4 2023

Shares 10,674 Value ($000) $7 Avg Close $573.49 Range $521.47 - $661.25

Q3 2023

Shares 10,884 Value ($000) $6 Avg Close $532.21 Range $505.45 - $552.31

Q2 2023

Shares 10,807 Value ($000) $6 Avg Close $487.14 Range $459.09 - $519.84

Q1 2023

Shares 10,897 Value ($000) $5 Avg Close $471.27 Range $429.88 - $509.61

Q4 2022

Shares 11,167 Value ($000) $5 Avg Close $468.77 Range $430.19 - $520.75

Q3 2022

Shares 11,272 Value ($000) $5,323 Avg Close $498.08 Range $444.08 - $541.06

Q2 2022

Shares 11,440 Value ($000) $5,483 Avg Close $484.91 Range $388.78 - $584.62

Q1 2022

Shares 11,480 Value ($000) $6,611 Avg Close $500.83 Range $447.15 - $559.84

Q4 2021

Shares 11,800 Value ($000) $6,699 Avg Close $488.10 Range $415.17 - $544.86

Q3 2021

Shares 11,812 Value ($000) $5,308 Avg Close $418.22 Range $374.22 - $447.84

Q2 2021

Shares 11,802 Value ($000) $4,670 Avg Close $359.04 Range $333.36 - $380.48

Q1 2021

Shares 11,987 Value ($000) $4,225 Avg Close $329.77 Range $291.05 - $361.01

Q4 2020

Shares 12,152 Value ($000) $4,579 Avg Close $347.39 Range $324.71 - $367.18

Q3 2020

Shares 12,162 Value ($000) $4,318 Avg Close $309.06 Range $276.17 - $334.67

Q2 2020

Shares 12,227 Value ($000) $3,707 Avg Close $279.18 Range $257.36 - $295.59

Q1 2020

Shares 12,627 Value ($000) $3,600 Avg Close $277.78 Range $248.54 - $298.00

Q4 2019

Shares 12,782 Value ($000) $3,757 Avg Close $271.52 Range $256.90 - $280.77

Q3 2019

Shares 12,923 Value ($000) $3,723 Avg Close $256.34 Range $238.19 - $280.38

Q2 2019

Shares 13,006 Value ($000) $3,437 Avg Close $226.60 Range $212.14 - $244.81

Q1 2019

Shares 12,971 Value ($000) $3,141 Avg Close $198.35 Range $180.94 - $220.09

Q4 2018

Shares 13,137 Value ($000) $2,676 Avg Close $201.98 Range $171.58 - $217.57

Q3 2018

Shares 13,077 Value ($000) $3,072 Avg Close $203.13 Range $185.65 - $221.43

Q2 2018

Shares 13,145 Value ($000) $2,747 Avg Close $177.76 Range $162.55 - $191.42

Q1 2018

Shares 13,555 Value ($000) $2,554 Avg Close $169.26 Range $157.50 - $179.09

Q4 2017

Shares 13,545 Value ($000) $2,521 Avg Close $154.45 Range $137.67 - $175.03

Q3 2017

Shares 13,545 Value ($000) $2,225 Avg Close $140.12 Range $133.57 - $147.68

Q2 2017

Shares 13,545 Value ($000) $2,166 Avg Close $150.98 Range $139.41 - $162.71

Q1 2017

Shares 13,005 Value ($000) $2,181 Avg Close $142.87 Range $134.91 - $152.51

Q4 2016

Shares 13,055 Value ($000) $2,090 Avg Close $129.79 Range $120.95 - $140.39

Q3 2016

Shares 12,005 Value ($000) $1,831 Avg Close $136.95 Range $124.90 - $143.90

Q2 2016

Shares 12,105 Value ($000) $1,901 Avg Close $128.04 Range $117.26 - $134.37

Q1 2016

Shares 12,005 Value ($000) $1,892 Avg Close $127.74 Range $119.17 - $135.67

Q4 2015

Shares 12,355 Value ($000) $1,995 Avg Close $132.84 Range $119.34 - $142.82

Q3 2015

Shares 12,255 Value ($000) $1,772 Avg Close $119.60 Range $98.22 - $123.53

Q2 2015

Shares 12,205 Value ($000) $1,648 Avg Close $120.23 Range $112.77 - $127.67

Q1 2015

Shares 12,145 Value ($000) $1,840 Avg Close $120.91 Range $111.40 - $128.73

Q4 2014

Shares 11,075 Value ($000) $1,570 Avg Close $109.42 Range $98.12 - $118.34

Q3 2014

Shares 10,975 Value ($000) $1,375 Avg Close $97.13 Range $92.09 - $102.72

Q2 2014

Shares 10,900 Value ($000) $1,255 Avg Close $91.81 Range $88.18 - $95.25

Q1 2014

Shares 10,900 Value ($000) $1,217 Avg Close $91.29 Range $87.26 - $95.07

Q4 2013

Shares 10,900 Value ($000) $1,297 Avg Close $95.15 Range $87.55 - $100.50

Q3 2013

Shares 10,650 Value ($000) $1,227 Avg Close $91.64 Range $87.25 - $95.29

Q2 2013

Shares 29,650 Value ($000) $3,278 Avg Close $86.56 Range $81.59 - $91.78

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	9,732	$8	$905.73	$844.06 - $962.64
Q3 2025	9,737	$9	$956.70	$902.01 - $997.89
Q2 2025	9,905	$10	$990.72	$868.14 - $1064.10
Q1 2025	10,037	$9	$970.56	$877.95 - $1073.82
Q4 2024	10,093	$9	$922.64	$861.51 - $1003.02
Q3 2024	10,107	$9	$861.91	$787.84 - $917.81
Q2 2024	9,882	$8	$773.82	$690.64 - $867.04
Q1 2024	10,459	$8	$706.75	$633.49 - $779.59
Q4 2023	10,674	$7	$573.49	$521.47 - $661.25
Q3 2023	10,884	$6	$532.21	$505.45 - $552.31
Q2 2023	10,807	$6	$487.14	$459.09 - $519.84
Q1 2023	10,897	$5	$471.27	$429.88 - $509.61
Q4 2022	11,167	$5	$468.77	$430.19 - $520.75
Q3 2022	11,272	$5,323	$498.08	$444.08 - $541.06
Q2 2022	11,440	$5,483	$484.91	$388.78 - $584.62
Q1 2022	11,480	$6,611	$500.83	$447.15 - $559.84
Q4 2021	11,800	$6,699	$488.10	$415.17 - $544.86
Q3 2021	11,812	$5,308	$418.22	$374.22 - $447.84
Q2 2021	11,802	$4,670	$359.04	$333.36 - $380.48
Q1 2021	11,987	$4,225	$329.77	$291.05 - $361.01
Q4 2020	12,152	$4,579	$347.39	$324.71 - $367.18
Q3 2020	12,162	$4,318	$309.06	$276.17 - $334.67
Q2 2020	12,227	$3,707	$279.18	$257.36 - $295.59
Q1 2020	12,627	$3,600	$277.78	$248.54 - $298.00
Q4 2019	12,782	$3,757	$271.52	$256.90 - $280.77
Q3 2019	12,923	$3,723	$256.34	$238.19 - $280.38
Q2 2019	13,006	$3,437	$226.60	$212.14 - $244.81
Q1 2019	12,971	$3,141	$198.35	$180.94 - $220.09
Q4 2018	13,137	$2,676	$201.98	$171.58 - $217.57
Q3 2018	13,077	$3,072	$203.13	$185.65 - $221.43
Q2 2018	13,145	$2,747	$177.76	$162.55 - $191.42
Q1 2018	13,555	$2,554	$169.26	$157.50 - $179.09
Q4 2017	13,545	$2,521	$154.45	$137.67 - $175.03
Q3 2017	13,545	$2,225	$140.12	$133.57 - $147.68
Q2 2017	13,545	$2,166	$150.98	$139.41 - $162.71
Q1 2017	13,005	$2,181	$142.87	$134.91 - $152.51
Q4 2016	13,055	$2,090	$129.79	$120.95 - $140.39
Q3 2016	12,005	$1,831	$136.95	$124.90 - $143.90
Q2 2016	12,105	$1,901	$128.04	$117.26 - $134.37
Q1 2016	12,005	$1,892	$127.74	$119.17 - $135.67
Q4 2015	12,355	$1,995	$132.84	$119.34 - $142.82
Q3 2015	12,255	$1,772	$119.60	$98.22 - $123.53
Q2 2015	12,205	$1,648	$120.23	$112.77 - $127.67
Q1 2015	12,145	$1,840	$120.91	$111.40 - $128.73
Q4 2014	11,075	$1,570	$109.42	$98.12 - $118.34
Q3 2014	10,975	$1,375	$97.13	$92.09 - $102.72
Q2 2014	10,900	$1,255	$91.81	$88.18 - $95.25
Q1 2014	10,900	$1,217	$91.29	$87.26 - $95.07
Q4 2013	10,900	$1,297	$95.15	$87.55 - $100.50
Q3 2013	10,650	$1,227	$91.64	$87.25 - $95.29
Q2 2013	29,650	$3,278	$86.56	$81.59 - $91.78