MERCK & CO INC

Ticker: MRK CUSIP: 58933Y105 Class: COM

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

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

Q4 2025

Shares 60,485 Value ($000) $6,367 Avg Close $93.24 Range $81.31 - $107.59

Q3 2025

Shares 55,272 Value ($000) $4,639 Avg Close $81.01 Range $75.27 - $86.24

Q2 2025

Shares 58,398 Value ($000) $4,623 Avg Close $77.39 Range $71.26 - $87.25

Q1 2025

Shares 60,888 Value ($000) $5,465 Avg Close $90.12 Range $78.10 - $99.24

Q4 2024

Shares 60,853 Value ($000) $6,054 Avg Close $98.70 Range $90.33 - $109.75

Q3 2024

Shares 65,847 Value ($000) $7,478 Avg Close $112.96 Range $105.16 - $123.40

Q2 2024

Shares 66,037 Value ($000) $8,175 Avg Close $121.72 Range $114.80 - $127.87

Q1 2024

Shares 60,822 Value ($000) $8,025 Avg Close $115.77 Range $102.41 - $125.66

Q4 2023

Shares 54,587 Value ($000) $5,951 Avg Close $96.81 Range $92.34 - $102.48

Q3 2023

Shares 55,559 Value ($000) $5,720 Avg Close $99.84 Range $95.67 - $106.04

Q2 2023

Shares 55,889 Value ($000) $6,449 Avg Close $104.47 Range $97.02 - $109.95

Q1 2023

Shares 56,504 Value ($000) $6,011 Avg Close $98.68 Range $92.86 - $105.40

Q4 2022

Shares 56,300 Value ($000) $6,246 Avg Close $92.80 Range $77.99 - $103.03

Q3 2022

Shares 55,530 Value ($000) $4,782 Avg Close $80.41 Range $76.51 - $85.75

Q2 2022

Shares 55,743 Value ($000) $5,082 Avg Close $79.21 Range $72.83 - $86.09

Q1 2022

Shares 55,600 Value ($000) $4,761 Avg Close $69.85 Range $64.44 - $74.38

Q4 2021

Shares 61,830 Value ($000) $4,739 Avg Close $69.89 Range $62.63 - $80.06

Q3 2021

Shares 57,510 Value ($000) $4,320 Avg Close $66.14 Range $62.09 - $68.78

Q2 2021

Shares 57,260 Value ($000) $4,453 Avg Close $64.14 Range $59.83 - $67.79

Q1 2021

Shares 57,565 Value ($000) $4,433 Avg Close $63.06 Range $58.39 - $69.69

Q4 2020

Shares 57,115 Value ($000) $4,672 Avg Close $64.85 Range $59.73 - $68.80

Q3 2020

Shares 57,565 Value ($000) $4,775 Avg Close $65.93 Range $60.98 - $70.41

Q2 2020

Shares 64,174 Value ($000) $4,963 Avg Close $62.87 Range $58.07 - $67.36

Q1 2020

Shares 85,346 Value ($000) $6,567 Avg Close $65.09 Range $51.91 - $72.71

Q4 2019

Shares 86,559 Value ($000) $7,873 Avg Close $67.55 Range $62.89 - $73.10

Q3 2019

Shares 83,819 Value ($000) $7,056 Avg Close $65.47 Range $61.22 - $68.01

Q2 2019

Shares 195,197 Value ($000) $16,367 Avg Close $62.14 Range $55.86 - $67.34

Q1 2019

Shares 194,272 Value ($000) $16,158 Avg Close $60.29 Range $55.35 - $64.55

Q4 2018

Shares 177,987 Value ($000) $13,600 Avg Close $56.50 Range $50.42 - $61.17

Q3 2018

Shares 178,887 Value ($000) $12,690 Avg Close $50.65 Range $45.40 - $54.60

Q2 2018

Shares 178,612 Value ($000) $10,842 Avg Close $44.52 Range $39.72 - $47.34

Q1 2018

Shares 79,203 Value ($000) $4,314 Avg Close $42.25 Range $39.59 - $47.54

Q4 2017

Shares 81,056 Value ($000) $4,561 Avg Close $43.00 Range $39.63 - $47.96

Q3 2017

Shares 161,402 Value ($000) $10,335 Avg Close $46.68 Range $44.87 - $49.08

Q2 2017

Shares 61,493 Value ($000) $3,941 Avg Close $46.54 Range $45.06 - $48.72

Q1 2017

Shares 62,641 Value ($000) $3,980 Avg Close $46.06 Range $42.70 - $48.31

Q4 2016

Shares 63,943 Value ($000) $3,764 Avg Close $44.08 Range $41.83 - $46.98

Q3 2016

Shares 63,318 Value ($000) $3,952 Avg Close $43.73 Range $40.74 - $45.59

Q2 2016

Shares 67,770 Value ($000) $3,904 Avg Close $39.48 Range $37.06 - $41.09

Q1 2016

Shares 67,670 Value ($000) $3,580 Avg Close $36.03 Range $33.60 - $37.88

Q4 2015

Shares 67,754 Value ($000) $3,579 Avg Close $36.77 Range $33.58 - $38.73

Q3 2015

Shares 76,300 Value ($000) $3,768 Avg Close $38.40 Range $31.46 - $41.36

Q2 2015

Shares 76,125 Value ($000) $4,334 Avg Close $40.23 Range $38.42 - $42.17

Q1 2015

Shares 75,775 Value ($000) $4,356 Avg Close $40.30 Range $37.94 - $43.13

Q4 2014

Shares 72,745 Value ($000) $4,131 Avg Close $39.35 Range $35.32 - $41.85

Q3 2014

Shares 72,450 Value ($000) $4,295 Avg Close $39.37 Range $37.12 - $41.03

Q2 2014

Shares 72,291 Value ($000) $4,182 Avg Close $37.96 Range $36.06 - $39.67

Q1 2014

Shares 68,722 Value ($000) $3,901 Avg Close $35.76 Range $32.43 - $37.92

Q4 2013

Shares 68,072 Value ($000) $3,407 Avg Close $31.29 Range $29.09 - $32.94

Q3 2013

Shares 84,815 Value ($000) $4,038 Avg Close $30.97 Range $29.74 - $31.75

Q2 2013

Shares 81,458 Value ($000) $3,784 Avg Close $30.02 Range $28.02 - $32.11

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	60,485	$6,367	$93.24	$81.31 - $107.59
Q3 2025	55,272	$4,639	$81.01	$75.27 - $86.24
Q2 2025	58,398	$4,623	$77.39	$71.26 - $87.25
Q1 2025	60,888	$5,465	$90.12	$78.10 - $99.24
Q4 2024	60,853	$6,054	$98.70	$90.33 - $109.75
Q3 2024	65,847	$7,478	$112.96	$105.16 - $123.40
Q2 2024	66,037	$8,175	$121.72	$114.80 - $127.87
Q1 2024	60,822	$8,025	$115.77	$102.41 - $125.66
Q4 2023	54,587	$5,951	$96.81	$92.34 - $102.48
Q3 2023	55,559	$5,720	$99.84	$95.67 - $106.04
Q2 2023	55,889	$6,449	$104.47	$97.02 - $109.95
Q1 2023	56,504	$6,011	$98.68	$92.86 - $105.40
Q4 2022	56,300	$6,246	$92.80	$77.99 - $103.03
Q3 2022	55,530	$4,782	$80.41	$76.51 - $85.75
Q2 2022	55,743	$5,082	$79.21	$72.83 - $86.09
Q1 2022	55,600	$4,761	$69.85	$64.44 - $74.38
Q4 2021	61,830	$4,739	$69.89	$62.63 - $80.06
Q3 2021	57,510	$4,320	$66.14	$62.09 - $68.78
Q2 2021	57,260	$4,453	$64.14	$59.83 - $67.79
Q1 2021	57,565	$4,433	$63.06	$58.39 - $69.69
Q4 2020	57,115	$4,672	$64.85	$59.73 - $68.80
Q3 2020	57,565	$4,775	$65.93	$60.98 - $70.41
Q2 2020	64,174	$4,963	$62.87	$58.07 - $67.36
Q1 2020	85,346	$6,567	$65.09	$51.91 - $72.71
Q4 2019	86,559	$7,873	$67.55	$62.89 - $73.10
Q3 2019	83,819	$7,056	$65.47	$61.22 - $68.01
Q2 2019	195,197	$16,367	$62.14	$55.86 - $67.34
Q1 2019	194,272	$16,158	$60.29	$55.35 - $64.55
Q4 2018	177,987	$13,600	$56.50	$50.42 - $61.17
Q3 2018	178,887	$12,690	$50.65	$45.40 - $54.60
Q2 2018	178,612	$10,842	$44.52	$39.72 - $47.34
Q1 2018	79,203	$4,314	$42.25	$39.59 - $47.54
Q4 2017	81,056	$4,561	$43.00	$39.63 - $47.96
Q3 2017	161,402	$10,335	$46.68	$44.87 - $49.08
Q2 2017	61,493	$3,941	$46.54	$45.06 - $48.72
Q1 2017	62,641	$3,980	$46.06	$42.70 - $48.31
Q4 2016	63,943	$3,764	$44.08	$41.83 - $46.98
Q3 2016	63,318	$3,952	$43.73	$40.74 - $45.59
Q2 2016	67,770	$3,904	$39.48	$37.06 - $41.09
Q1 2016	67,670	$3,580	$36.03	$33.60 - $37.88
Q4 2015	67,754	$3,579	$36.77	$33.58 - $38.73
Q3 2015	76,300	$3,768	$38.40	$31.46 - $41.36
Q2 2015	76,125	$4,334	$40.23	$38.42 - $42.17
Q1 2015	75,775	$4,356	$40.30	$37.94 - $43.13
Q4 2014	72,745	$4,131	$39.35	$35.32 - $41.85
Q3 2014	72,450	$4,295	$39.37	$37.12 - $41.03
Q2 2014	72,291	$4,182	$37.96	$36.06 - $39.67
Q1 2014	68,722	$3,901	$35.76	$32.43 - $37.92
Q4 2013	68,072	$3,407	$31.29	$29.09 - $32.94
Q3 2013	84,815	$4,038	$30.97	$29.74 - $31.75
Q2 2013	81,458	$3,784	$30.02	$28.02 - $32.11