MERCK & CO INC

Ticker: MRK CUSIP: 58933Y105 Class: COM

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

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

Q4 2025

Shares 719,806 Value ($000) $75,767 Avg Close $93.24 Range $81.31 - $107.59

Q3 2025

Shares 510,200 Value ($000) $42,821 Avg Close $81.01 Range $75.27 - $86.24

Q2 2025

Shares 510,213 Value ($000) $40,388 Avg Close $77.39 Range $71.26 - $87.25

Q1 2025

Shares 668,215 Value ($000) $59,979 Avg Close $90.12 Range $78.10 - $99.24

Q4 2024

Shares 852,847 Value ($000) $84,841 Avg Close $98.70 Range $90.33 - $109.75

Q3 2024

Shares 953,704 Value ($000) $108,303 Avg Close $112.96 Range $105.16 - $123.40

Q2 2024

Shares 934,413 Value ($000) $115,680 Avg Close $121.72 Range $114.80 - $127.87

Q1 2024

Shares 997,449 Value ($000) $131,613 Avg Close $115.77 Range $102.41 - $125.66

Q4 2023

Shares 941,273 Value ($000) $102,618 Avg Close $96.81 Range $92.34 - $102.48

Q3 2023

Shares 970,607 Value ($000) $99,924 Avg Close $99.84 Range $95.67 - $106.04

Q2 2023

Shares 782,141 Value ($000) $90,251 Avg Close $104.47 Range $97.02 - $109.95

Q1 2023

Shares 713,245 Value ($000) $75,882 Avg Close $98.68 Range $92.86 - $105.40

Q4 2022

Shares 773,867 Value ($000) $85,861 Avg Close $92.80 Range $77.99 - $103.03

Q3 2022

Shares 811,588 Value ($000) $69,894 Avg Close $80.41 Range $76.51 - $85.75

Q2 2022

Shares 649,200 Value ($000) $59,188 Avg Close $79.21 Range $72.83 - $86.09

Q1 2022

Shares 631,280 Value ($000) $51,797 Avg Close $69.85 Range $64.44 - $74.38

Q4 2021

Shares 799,178 Value ($000) $61,249 Avg Close $69.89 Range $62.63 - $80.06

Q3 2021

Shares 809,768 Value ($000) $60,822 Avg Close $66.14 Range $62.09 - $68.78

Q2 2021

Shares 759,439 Value ($000) $59,062 Avg Close $64.14 Range $59.83 - $67.79

Q1 2021

Shares 644,182 Value ($000) $49,660 Avg Close $63.06 Range $58.39 - $69.69

Q4 2020

Shares 632,134 Value ($000) $51,709 Avg Close $64.85 Range $59.73 - $68.80

Q3 2020

Shares 649,148 Value ($000) $53,847 Avg Close $65.93 Range $60.98 - $70.41

Q2 2020

Shares 685,429 Value ($000) $53,004 Avg Close $62.87 Range $58.07 - $67.36

Q1 2020

Shares 780,747 Value ($000) $60,071 Avg Close $65.09 Range $51.91 - $72.71

Q4 2019

Shares 1,163,845 Value ($000) $105,852 Avg Close $67.55 Range $62.89 - $73.10

Q3 2019

Shares 1,172,112 Value ($000) $98,668 Avg Close $65.47 Range $61.22 - $68.01

Q2 2019

Shares 1,129,266 Value ($000) $94,689 Avg Close $62.14 Range $55.86 - $67.34

Q1 2019

Shares 1,016,719 Value ($000) $84,561 Avg Close $60.29 Range $55.35 - $64.55

Q4 2018

Shares 921,151 Value ($000) $70,385 Avg Close $56.50 Range $50.42 - $61.17

Q3 2018

Shares 857,439 Value ($000) $60,827 Avg Close $50.65 Range $45.40 - $54.60

Q2 2018

Shares 866,893 Value ($000) $52,620 Avg Close $44.52 Range $39.72 - $47.34

Q1 2018

Shares 891,642 Value ($000) $48,568 Avg Close $42.25 Range $39.59 - $47.54

Q4 2017

Shares 952,921 Value ($000) $53,621 Avg Close $43.00 Range $39.63 - $47.96

Q3 2017

Shares 1,151,798 Value ($000) $73,750 Avg Close $46.68 Range $44.87 - $49.08

Q2 2017

Shares 1,259,200 Value ($000) $80,702 Avg Close $46.54 Range $45.06 - $48.72

Q1 2017

Shares 1,257,825 Value ($000) $79,922 Avg Close $46.06 Range $42.70 - $48.31

Q4 2016

Shares 1,270,603 Value ($000) $74,800 Avg Close $44.08 Range $41.83 - $46.98

Q3 2016

Shares 1,284,265 Value ($000) $80,151 Avg Close $43.73 Range $40.74 - $45.59

Q2 2016

Shares 1,295,052 Value ($000) $74,608 Avg Close $39.48 Range $37.06 - $41.09

Q1 2016

Shares 1,645,739 Value ($000) $87,076 Avg Close $36.03 Range $33.60 - $37.88

Q4 2015

Shares 1,621,533 Value ($000) $85,649 Avg Close $36.77 Range $33.58 - $38.73

Q3 2015

Shares 1,701,490 Value ($000) $84,037 Avg Close $38.40 Range $31.46 - $41.36

Q2 2015

Shares 1,666,163 Value ($000) $94,855 Avg Close $40.23 Range $38.42 - $42.17

Q1 2015

Shares 1,098,075 Value ($000) $63,117 Avg Close $40.30 Range $37.94 - $43.13

Q4 2014

Shares 1,117,360 Value ($000) $63,455 Avg Close $39.35 Range $35.32 - $41.85

Q3 2014

Shares 1,124,993 Value ($000) $66,690 Avg Close $39.37 Range $37.12 - $41.03

Q2 2014

Shares 1,125,409 Value ($000) $65,105 Avg Close $37.96 Range $36.06 - $39.67

Q1 2014

Shares 1,099,952 Value ($000) $62,444 Avg Close $35.76 Range $32.43 - $37.92

Q4 2013

Shares 1,102,445 Value ($000) $55,177 Avg Close $31.29 Range $29.09 - $32.94

Q3 2013

Shares 1,871,061 Value ($000) $89,081 Avg Close $30.97 Range $29.74 - $31.75

Q2 2013

Shares 1,950,886 Value ($000) $90,619 Avg Close $30.02 Range $28.02 - $32.11

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	719,806	$75,767	$93.24	$81.31 - $107.59
Q3 2025	510,200	$42,821	$81.01	$75.27 - $86.24
Q2 2025	510,213	$40,388	$77.39	$71.26 - $87.25
Q1 2025	668,215	$59,979	$90.12	$78.10 - $99.24
Q4 2024	852,847	$84,841	$98.70	$90.33 - $109.75
Q3 2024	953,704	$108,303	$112.96	$105.16 - $123.40
Q2 2024	934,413	$115,680	$121.72	$114.80 - $127.87
Q1 2024	997,449	$131,613	$115.77	$102.41 - $125.66
Q4 2023	941,273	$102,618	$96.81	$92.34 - $102.48
Q3 2023	970,607	$99,924	$99.84	$95.67 - $106.04
Q2 2023	782,141	$90,251	$104.47	$97.02 - $109.95
Q1 2023	713,245	$75,882	$98.68	$92.86 - $105.40
Q4 2022	773,867	$85,861	$92.80	$77.99 - $103.03
Q3 2022	811,588	$69,894	$80.41	$76.51 - $85.75
Q2 2022	649,200	$59,188	$79.21	$72.83 - $86.09
Q1 2022	631,280	$51,797	$69.85	$64.44 - $74.38
Q4 2021	799,178	$61,249	$69.89	$62.63 - $80.06
Q3 2021	809,768	$60,822	$66.14	$62.09 - $68.78
Q2 2021	759,439	$59,062	$64.14	$59.83 - $67.79
Q1 2021	644,182	$49,660	$63.06	$58.39 - $69.69
Q4 2020	632,134	$51,709	$64.85	$59.73 - $68.80
Q3 2020	649,148	$53,847	$65.93	$60.98 - $70.41
Q2 2020	685,429	$53,004	$62.87	$58.07 - $67.36
Q1 2020	780,747	$60,071	$65.09	$51.91 - $72.71
Q4 2019	1,163,845	$105,852	$67.55	$62.89 - $73.10
Q3 2019	1,172,112	$98,668	$65.47	$61.22 - $68.01
Q2 2019	1,129,266	$94,689	$62.14	$55.86 - $67.34
Q1 2019	1,016,719	$84,561	$60.29	$55.35 - $64.55
Q4 2018	921,151	$70,385	$56.50	$50.42 - $61.17
Q3 2018	857,439	$60,827	$50.65	$45.40 - $54.60
Q2 2018	866,893	$52,620	$44.52	$39.72 - $47.34
Q1 2018	891,642	$48,568	$42.25	$39.59 - $47.54
Q4 2017	952,921	$53,621	$43.00	$39.63 - $47.96
Q3 2017	1,151,798	$73,750	$46.68	$44.87 - $49.08
Q2 2017	1,259,200	$80,702	$46.54	$45.06 - $48.72
Q1 2017	1,257,825	$79,922	$46.06	$42.70 - $48.31
Q4 2016	1,270,603	$74,800	$44.08	$41.83 - $46.98
Q3 2016	1,284,265	$80,151	$43.73	$40.74 - $45.59
Q2 2016	1,295,052	$74,608	$39.48	$37.06 - $41.09
Q1 2016	1,645,739	$87,076	$36.03	$33.60 - $37.88
Q4 2015	1,621,533	$85,649	$36.77	$33.58 - $38.73
Q3 2015	1,701,490	$84,037	$38.40	$31.46 - $41.36
Q2 2015	1,666,163	$94,855	$40.23	$38.42 - $42.17
Q1 2015	1,098,075	$63,117	$40.30	$37.94 - $43.13
Q4 2014	1,117,360	$63,455	$39.35	$35.32 - $41.85
Q3 2014	1,124,993	$66,690	$39.37	$37.12 - $41.03
Q2 2014	1,125,409	$65,105	$37.96	$36.06 - $39.67
Q1 2014	1,099,952	$62,444	$35.76	$32.43 - $37.92
Q4 2013	1,102,445	$55,177	$31.29	$29.09 - $32.94
Q3 2013	1,871,061	$89,081	$30.97	$29.74 - $31.75
Q2 2013	1,950,886	$90,619	$30.02	$28.02 - $32.11