MERCK & CO INC

Ticker: MRK CUSIP: 58933Y105 Class: COM

Main Street Research LLC's Holding History (CIK: 0001513211)

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

Q4 2025

Shares 7,784 Value ($000) $826 Avg Close $93.24 Range $81.31 - $107.59

Q3 2025

Shares 9,270 Value ($000) $778 Avg Close $81.01 Range $75.27 - $86.24

Q2 2025

Shares 8,968 Value ($000) $717 Avg Close $77.39 Range $71.26 - $87.25

Q1 2025

Shares 9,230 Value ($000) $836 Avg Close $90.12 Range $78.10 - $99.24

Q4 2024

Shares 9,667 Value ($000) $970 Avg Close $98.70 Range $90.33 - $109.75

Q3 2024

Shares 9,689 Value ($000) $1,108 Avg Close $112.96 Range $105.16 - $123.40

Q2 2024

Shares 5,775 Value ($000) $719 Avg Close $121.72 Range $114.80 - $127.87

Q1 2024

Shares 5,462 Value ($000) $725 Avg Close $115.77 Range $102.41 - $125.66

Q4 2023

Shares 5,671 Value ($000) $758 Avg Close $96.81 Range $92.34 - $102.48

Q3 2023

Shares 107,308 Value ($000) $11,126 Avg Close $99.84 Range $95.67 - $106.04

Q2 2023

Shares 108,087 Value ($000) $12,477 Avg Close $104.47 Range $97.02 - $109.95

Q1 2023

Shares 6,429 Value ($000) $689 Avg Close $98.68 Range $92.86 - $105.40

Q4 2022

Shares 6,745 Value ($000) $753 Avg Close $92.80 Range $77.99 - $103.03

Q3 2022

Shares 6,371 Value ($000) $549 Avg Close $80.41 Range $76.51 - $85.75

Q2 2022

Shares 4,861 Value ($000) $443 Avg Close $79.21 Range $72.83 - $86.09

Q1 2022

Shares 6,378 Value ($000) $523 Avg Close $69.85 Range $64.44 - $74.38

Q4 2021

Shares 7,324 Value ($000) $561 Avg Close $69.89 Range $62.63 - $80.06

Q3 2021

Shares 6,198 Value ($000) $466 Avg Close $66.14 Range $62.09 - $68.78

Q2 2020

Shares 9,162 Value ($000) $709 Avg Close $62.87 Range $58.07 - $67.36

Q1 2020

Shares 9,150 Value ($000) $704 Avg Close $65.09 Range $51.91 - $72.71

Q4 2019

Shares 156,619 Value ($000) $14,244 Avg Close $67.55 Range $62.89 - $73.10

Q3 2019

Shares 157,534 Value ($000) $13,261 Avg Close $65.47 Range $61.22 - $68.01

Q1 2019

Shares 7,040 Value ($000) $586 Avg Close $60.29 Range $55.35 - $64.55

Q4 2018

Shares 6,803 Value ($000) $520 Avg Close $56.50 Range $50.42 - $61.17

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	7,784	$826	$93.24	$81.31 - $107.59
Q3 2025	9,270	$778	$81.01	$75.27 - $86.24
Q2 2025	8,968	$717	$77.39	$71.26 - $87.25
Q1 2025	9,230	$836	$90.12	$78.10 - $99.24
Q4 2024	9,667	$970	$98.70	$90.33 - $109.75
Q3 2024	9,689	$1,108	$112.96	$105.16 - $123.40
Q2 2024	5,775	$719	$121.72	$114.80 - $127.87
Q1 2024	5,462	$725	$115.77	$102.41 - $125.66
Q4 2023	5,671	$758	$96.81	$92.34 - $102.48
Q3 2023	107,308	$11,126	$99.84	$95.67 - $106.04
Q2 2023	108,087	$12,477	$104.47	$97.02 - $109.95
Q1 2023	6,429	$689	$98.68	$92.86 - $105.40
Q4 2022	6,745	$753	$92.80	$77.99 - $103.03
Q3 2022	6,371	$549	$80.41	$76.51 - $85.75
Q2 2022	4,861	$443	$79.21	$72.83 - $86.09
Q1 2022	6,378	$523	$69.85	$64.44 - $74.38
Q4 2021	7,324	$561	$69.89	$62.63 - $80.06
Q3 2021	6,198	$466	$66.14	$62.09 - $68.78
Q2 2020	9,162	$709	$62.87	$58.07 - $67.36
Q1 2020	9,150	$704	$65.09	$51.91 - $72.71
Q4 2019	156,619	$14,244	$67.55	$62.89 - $73.10
Q3 2019	157,534	$13,261	$65.47	$61.22 - $68.01
Q1 2019	7,040	$586	$60.29	$55.35 - $64.55
Q4 2018	6,803	$520	$56.50	$50.42 - $61.17