COSTCO WHSL CORP NEW

Ticker: COST CUSIP: 22160K105 Class: COM

Calamos Advisors LLC's Holding History (CIK: 0001316507)

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

Q4 2025

Shares 88,093 Value ($000) $75,966 Avg Close $905.73 Range $844.06 - $962.64

Q3 2025

Shares 95,630 Value ($000) $88,518 Avg Close $956.70 Range $902.01 - $997.89

Q2 2025

Shares 105,334 Value ($000) $104,274 Avg Close $990.72 Range $868.14 - $1064.10

Q1 2025

Shares 105,287 Value ($000) $99,578 Avg Close $970.56 Range $877.95 - $1073.82

Q4 2024

Shares 107,588 Value ($000) $98,580 Avg Close $922.64 Range $861.51 - $1003.02

Q3 2024

Shares 107,747 Value ($000) $95,520 Avg Close $861.91 Range $787.84 - $917.81

Q2 2024

Shares 108,748 Value ($000) $92,435 Avg Close $773.82 Range $690.64 - $867.04

Q1 2024

Shares 110,910 Value ($000) $81,256 Avg Close $706.75 Range $633.49 - $779.59

Q4 2023

Shares 112,269 Value ($000) $74,107 Avg Close $573.49 Range $521.47 - $661.25

Q3 2023

Shares 113,660 Value ($000) $64,213 Avg Close $532.21 Range $505.45 - $552.31

Q2 2023

Shares 109,784 Value ($000) $59,106 Avg Close $487.14 Range $459.09 - $519.84

Q1 2023

Shares 109,719 Value ($000) $54,516 Avg Close $471.27 Range $429.88 - $509.61

Q4 2022

Shares 117,813 Value ($000) $53,782 Avg Close $468.77 Range $430.19 - $520.75

Q3 2022

Shares 135,038 Value ($000) $63,774 Avg Close $498.08 Range $444.08 - $541.06

Q2 2022

Shares 134,996 Value ($000) $64,701 Avg Close $484.91 Range $388.78 - $584.62

Q1 2022

Shares 155,973 Value ($000) $89,817 Avg Close $500.83 Range $447.15 - $559.84

Q4 2021

Shares 148,164 Value ($000) $84,113 Avg Close $488.10 Range $415.17 - $544.86

Q3 2021

Shares 145,590 Value ($000) $65,421 Avg Close $418.22 Range $374.22 - $447.84

Q2 2021

Shares 122,559 Value ($000) $48,493 Avg Close $359.04 Range $333.36 - $380.48

Q1 2021

Shares 108,162 Value ($000) $38,125 Avg Close $329.77 Range $291.05 - $361.01

Q4 2020

Shares 105,881 Value ($000) $39,894 Avg Close $347.39 Range $324.71 - $367.18

Q3 2020

Shares 114,630 Value ($000) $40,694 Avg Close $309.06 Range $276.17 - $334.67

Q2 2020

Shares 96,092 Value ($000) $29,136 Avg Close $279.18 Range $257.36 - $295.59

Q1 2020

Shares 107,599 Value ($000) $30,680 Avg Close $277.78 Range $248.54 - $298.00

Q4 2019

Shares 180,803 Value ($000) $53,142 Avg Close $271.52 Range $256.90 - $280.77

Q3 2019

Shares 203,845 Value ($000) $58,730 Avg Close $256.34 Range $238.19 - $280.38

Q2 2019

Shares 159,409 Value ($000) $42,125 Avg Close $226.60 Range $212.14 - $244.81

Q1 2019

Shares 170,125 Value ($000) $41,194 Avg Close $198.35 Range $180.94 - $220.09

Q4 2018

Shares 170,335 Value ($000) $34,699 Avg Close $201.98 Range $171.58 - $217.57

Q3 2018

Shares 177,405 Value ($000) $41,669 Avg Close $203.13 Range $185.65 - $221.43

Q2 2018

Shares 173,775 Value ($000) $36,315 Avg Close $177.76 Range $162.55 - $191.42

Q1 2018

Shares 167,276 Value ($000) $31,520 Avg Close $169.26 Range $157.50 - $179.09

Q4 2017

Shares 164,903 Value ($000) $30,692 Avg Close $154.45 Range $137.67 - $175.03

Q3 2017

Shares 170,503 Value ($000) $28,012 Avg Close $140.12 Range $133.57 - $147.68

Q2 2017

Shares 169,247 Value ($000) $27,068 Avg Close $150.98 Range $139.41 - $162.71

Q1 2017

Shares 386,699 Value ($000) $64,846 Avg Close $142.87 Range $134.91 - $152.51

Q4 2016

Shares 389,867 Value ($000) $62,422 Avg Close $129.79 Range $120.95 - $140.39

Q3 2016

Shares 420,735 Value ($000) $64,166 Avg Close $136.95 Range $124.90 - $143.90

Q2 2016

Shares 461,089 Value ($000) $72,409 Avg Close $128.04 Range $117.26 - $134.37

Q1 2016

Shares 461,276 Value ($000) $72,688 Avg Close $127.74 Range $119.17 - $135.67

Q4 2015

Shares 458,712 Value ($000) $74,082 Avg Close $132.84 Range $119.34 - $142.82

Q3 2015

Shares 459,167 Value ($000) $66,382 Avg Close $119.60 Range $98.22 - $123.53

Q2 2015

Shares 458,971 Value ($000) $61,989 Avg Close $120.23 Range $112.77 - $127.67

Q1 2015

Shares 634,541 Value ($000) $96,130 Avg Close $120.91 Range $111.40 - $128.73

Q4 2014

Shares 622,347 Value ($000) $88,218 Avg Close $109.42 Range $98.12 - $118.34

Q3 2014

Shares 872,047 Value ($000) $109,285 Avg Close $97.13 Range $92.09 - $102.72

Q2 2014

Shares 490,626 Value ($000) $56,500 Avg Close $91.81 Range $88.18 - $95.25

Q1 2014

Shares 490,501 Value ($000) $54,779 Avg Close $91.29 Range $87.26 - $95.07

Q4 2013

Shares 504,111 Value ($000) $59,994 Avg Close $95.15 Range $87.55 - $100.50

Q3 2013

Shares 504,696 Value ($000) $58,101 Avg Close $91.64 Range $87.25 - $95.29

Q2 2013

Shares 868,310 Value ($000) $96,010 Avg Close $86.56 Range $81.59 - $91.78

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	88,093	$75,966	$905.73	$844.06 - $962.64
Q3 2025	95,630	$88,518	$956.70	$902.01 - $997.89
Q2 2025	105,334	$104,274	$990.72	$868.14 - $1064.10
Q1 2025	105,287	$99,578	$970.56	$877.95 - $1073.82
Q4 2024	107,588	$98,580	$922.64	$861.51 - $1003.02
Q3 2024	107,747	$95,520	$861.91	$787.84 - $917.81
Q2 2024	108,748	$92,435	$773.82	$690.64 - $867.04
Q1 2024	110,910	$81,256	$706.75	$633.49 - $779.59
Q4 2023	112,269	$74,107	$573.49	$521.47 - $661.25
Q3 2023	113,660	$64,213	$532.21	$505.45 - $552.31
Q2 2023	109,784	$59,106	$487.14	$459.09 - $519.84
Q1 2023	109,719	$54,516	$471.27	$429.88 - $509.61
Q4 2022	117,813	$53,782	$468.77	$430.19 - $520.75
Q3 2022	135,038	$63,774	$498.08	$444.08 - $541.06
Q2 2022	134,996	$64,701	$484.91	$388.78 - $584.62
Q1 2022	155,973	$89,817	$500.83	$447.15 - $559.84
Q4 2021	148,164	$84,113	$488.10	$415.17 - $544.86
Q3 2021	145,590	$65,421	$418.22	$374.22 - $447.84
Q2 2021	122,559	$48,493	$359.04	$333.36 - $380.48
Q1 2021	108,162	$38,125	$329.77	$291.05 - $361.01
Q4 2020	105,881	$39,894	$347.39	$324.71 - $367.18
Q3 2020	114,630	$40,694	$309.06	$276.17 - $334.67
Q2 2020	96,092	$29,136	$279.18	$257.36 - $295.59
Q1 2020	107,599	$30,680	$277.78	$248.54 - $298.00
Q4 2019	180,803	$53,142	$271.52	$256.90 - $280.77
Q3 2019	203,845	$58,730	$256.34	$238.19 - $280.38
Q2 2019	159,409	$42,125	$226.60	$212.14 - $244.81
Q1 2019	170,125	$41,194	$198.35	$180.94 - $220.09
Q4 2018	170,335	$34,699	$201.98	$171.58 - $217.57
Q3 2018	177,405	$41,669	$203.13	$185.65 - $221.43
Q2 2018	173,775	$36,315	$177.76	$162.55 - $191.42
Q1 2018	167,276	$31,520	$169.26	$157.50 - $179.09
Q4 2017	164,903	$30,692	$154.45	$137.67 - $175.03
Q3 2017	170,503	$28,012	$140.12	$133.57 - $147.68
Q2 2017	169,247	$27,068	$150.98	$139.41 - $162.71
Q1 2017	386,699	$64,846	$142.87	$134.91 - $152.51
Q4 2016	389,867	$62,422	$129.79	$120.95 - $140.39
Q3 2016	420,735	$64,166	$136.95	$124.90 - $143.90
Q2 2016	461,089	$72,409	$128.04	$117.26 - $134.37
Q1 2016	461,276	$72,688	$127.74	$119.17 - $135.67
Q4 2015	458,712	$74,082	$132.84	$119.34 - $142.82
Q3 2015	459,167	$66,382	$119.60	$98.22 - $123.53
Q2 2015	458,971	$61,989	$120.23	$112.77 - $127.67
Q1 2015	634,541	$96,130	$120.91	$111.40 - $128.73
Q4 2014	622,347	$88,218	$109.42	$98.12 - $118.34
Q3 2014	872,047	$109,285	$97.13	$92.09 - $102.72
Q2 2014	490,626	$56,500	$91.81	$88.18 - $95.25
Q1 2014	490,501	$54,779	$91.29	$87.26 - $95.07
Q4 2013	504,111	$59,994	$95.15	$87.55 - $100.50
Q3 2013	504,696	$58,101	$91.64	$87.25 - $95.29
Q2 2013	868,310	$96,010	$86.56	$81.59 - $91.78