United States Pharmaceuticals

Merck & Co Inc (MRK)

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Over the past 90 days, Merck & Co Inc. has seen two insider transactions, both involving proposed sales by company officers totaling approximately $9.21 million. These transactions follow the company's recent earnings report on August 4, 2026, and occur amid a 16% stock price increase over the last three months.
Ticker: MRK Exchange: NYS
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for Merck & Co Inc. Upgrade to see score, net flow, insiders and the full signal context.

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Proposed sale 10 Aug 2026
Value US$3,469,647.60 | Price 21.40 | Shares 83,256
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-08-10 2026-08-10 PrS Proposed sale
3.3
RICHARD ROBERT DELUCA JR

Officer

Officer
83,256
21.40
US$3,469,648 		83,256 21.40 US$3,469,648
2026-08-10 2026-08-06 S Sale
3.3
DeLuca Richard R.

EVP&Pres, Merck Animal Heallth

Officer
27,063 +30.9%
183.23
US$1,370,609 		27,063 +30.9% 183.23 US$1,370,609
2026-08-10 2026-08-06 S Sale
3.3
DeLuca Richard R.

EVP&Pres, Merck Animal Heallth

Officer
28,673 +47.0%
489.01
US$4,126,567 		28,673 +47.0% 489.01 US$4,126,567
2026-08-10 2026-08-06 S Sale
3.3
DeLuca Richard R.

EVP&Pres, Merck Animal Heallth

Officer
1,000 -0.5%
131.02
US$100,000 		1,000 -0.5% 131.02 US$100,000
2026-08-07 2026-08-06 S Sale
2.9
Guindo Chirfi

EVP, Access, Policy & Comms

Officer
1,000 -24.3%
131.00
US$100,000 		1,000 -24.3% 131.00 US$100,000
2026-08-06 2026-08-06 PrS Proposed sale
3.3
RICHARD ROBERT DELUCA JR

Officer

Officer
1,000
130.38
US$100,000 		1,000 130.38 US$100,000
2026-08-06 2026-08-06 PrS Proposed sale
2.9
CHIRFI GUINDO

Officer

Officer
1,000
131.00
US$100,000 		1,000 131.00 US$100,000
2026-08-07 2026-08-05 S Sale
2.7
Williams David Michael

EVP,Chief Info&Digital Officer

Officer
1,000 -52.3%
128.77
US$100,000 		1,000 -52.3% 128.77 US$100,000
2026-08-07 2026-08-05 S Sale
2.7
Williams David Michael

EVP,Chief Info&Digital Officer

Officer
1,000 -29.9%
128.77
US$100,000 		1,000 -29.9% 128.77 US$100,000
2026-08-07 2026-08-05 S Sale
2.7
Williams David Michael

EVP,Chief Info&Digital Officer

Officer
1,000 -12.7%
128.77
US$100,000 		1,000 -12.7% 128.77 US$100,000
2026-08-07 2026-08-05 S Sale
Maraldo David R.

EVP & Pres. MMD

Officer
1,000 -12.9%
128.72
US$100,000 		1,000 -12.9% 128.72 US$100,000
2026-08-07 2026-08-05 S Sale
Maraldo David R.

EVP & Pres. MMD

Officer
1,000 -34.8%
128.72
US$100,000 		1,000 -34.8% 128.72 US$100,000
2026-08-07 2026-08-05 S Sale
Maraldo David R.

EVP & Pres. MMD

Officer
1,000 -25.7%
128.72
US$100,000 		1,000 -25.7% 128.72 US$100,000
2026-08-05 2026-08-05 PrS Proposed sale
2.7
DAVID M WILLIAMS

Officer

Officer
1,000
128.77
US$100,000 		1,000 128.77 US$100,000
2026-08-05 2026-08-05 PrS Proposed sale
DAVID MARALDO

Officer

Officer
1,000
128.72
US$100,000 		1,000 128.72 US$100,000
2026-02-12 2026-02-12 S Sale
2.9
Guindo Chirfi

Chief Marketing Officer

Officer
10,000 -14.2%
121.46
US$1,214,562 		10,000 -14.2% 121.46 US$1,214,562
2026-02-10 2026-02-10 PrS Proposed sale
2.6
DEAN LI

Officer

Officer
10,235
117.52
US$1,202,844 		10,235 117.52 US$1,202,844
2026-02-10 2026-02-10 S Sale
2.6
Li Dean Y

Executive VP & President, MRL

Officer
10,235 -10.0%
117.52
US$1,202,844 		10,235 -10.0% 117.52 US$1,202,844
2026-02-13 2026-02-09 PrS Proposed sale
2.9
CHIRFI GUINDO

Officer

Officer
20,000
118.41
US$2,368,202 		20,000 118.41 US$2,368,202
2026-02-09 2026-02-09 PrS Proposed sale
2.5
JENNIFER ZACHARY

Officer

Officer
121,573
119.15
US$14,485,690 		121,573 119.15 US$14,485,690
2026-02-09 2026-02-09 PrS Proposed sale
2.9
CHIRFI GUINDO

Officer

Officer
20,000
118.41
US$2,368,202 		20,000 118.41 US$2,368,202
2026-02-09 2026-02-09 S Sale
2.5
Zachary Jennifer

EVP, General Counsel

Officer
38,835 -36.0%
119.15
US$4,627,276 		38,835 -36.0% 119.15 US$4,627,276
2026-02-09 2026-02-09 S Sale
2.5
Zachary Jennifer

EVP, General Counsel

Officer
56,792 -45.2%
119.15
US$6,766,892 		56,792 -45.2% 119.15 US$6,766,892
2026-02-09 2026-02-09 S Sale
2.5
Zachary Jennifer

EVP, General Counsel

Officer
25,946 -27.4%
119.15
US$3,091,523 		25,946 -27.4% 119.15 US$3,091,523
2026-02-09 2026-02-09 S Sale
2.9
Guindo Chirfi

Chief Marketing Officer

Officer
10,000 -12.4%
118.41
US$1,184,101 		10,000 -12.4% 118.41 US$1,184,101
2026-02-06 2026-02-06 PrS Proposed sale
3.3
RICHARD ROBERT DELUCA JR.

Officer

Officer
37,685
120.92
US$4,557,025 		37,685 120.92 US$4,557,025
2026-02-06 2026-02-06 PrS Proposed sale
2.7
DAVID WILLIAMS

Officer

Officer
5,000
121.91
US$609,525 		5,000 121.91 US$609,525
2026-02-06 2026-02-06 PrS Proposed sale
2.5
JOHANNES JACOBUS OOSTHUIZEN

Officer

Officer
15,000
121.87
US$1,827,992 		15,000 121.87 US$1,827,992
2026-02-06 2026-02-06 S Sale
2.7
Williams David Michael

EVP,Chief Info&Digital Officer

Officer
5,000 -14.0%
121.91
US$609,525 		5,000 -14.0% 121.91 US$609,525
2026-02-06 2026-02-06 S Sale
2.5
Oosthuizen Johannes Jacobus

President, U.S. Market

Officer
15,000 -41.4%
121.87
US$1,827,992 		15,000 -41.4% 121.87 US$1,827,992
2026-02-06 2026-02-06 S Sale
3.3
DeLuca Richard R.

EVP&Pres, Merck Animal Heallth

Officer
37,685 -19.0%
120.92
US$4,557,025 		37,685 -19.0% 120.92 US$4,557,025
2026-02-06 2026-02-05 S Sale
2.9
Guindo Chirfi

Chief Marketing Officer

Officer
20,000 -19.9%
121.88
US$2,437,676 		20,000 -19.9% 121.88 US$2,437,676
2026-02-05 2026-02-05 PrS Proposed sale
2.9
CHIRFI GUINDO

Officer

Officer
20,000
121.88
US$2,437,676 		20,000 121.88 US$2,437,676
2026-02-06 2026-02-04 S Sale
2.6
Smart Dalton E. III

SVP Fin. - Global Controller

Officer
2,400 -22.6%
119.68
US$287,220 		2,400 -22.6% 119.68 US$287,220
2026-02-06 2026-02-04 S Sale
2.6
Smart Dalton E. III

SVP Fin. - Global Controller

Officer
4,000 -27.4%
119.68
US$478,700 		4,000 -27.4% 119.68 US$478,700
2026-02-06 2026-02-04 S Sale
2.6
Li Dean Y

Executive VP & President, MRL

Officer
15,087 -12.9%
118.77
US$1,791,824 		15,087 -12.9% 118.77 US$1,791,824
2026-02-06 2026-02-04 S Sale
3.0
Litchfield Caroline

EVP & CFO

Officer
41,997 -31.8%
119.61
US$5,023,312 		41,997 -31.8% 119.61 US$5,023,312
2026-02-06 2026-02-04 S Sale
2.9
Davis Robert M

Chairman, CEO & President

Executive Director
32,462 -6.8%
118.35
US$3,841,920 		32,462 -6.8% 118.35 US$3,841,920
2026-02-06 2026-02-04 S Sale
2.9
Davis Robert M

Chairman, CEO & President

Executive Director
14,972 -3.0%
117.38
US$1,757,407 		14,972 -3.0% 117.38 US$1,757,407
2026-02-04 2026-02-04 PrS Proposed sale
2.6
DALTON SMART

Officer

Officer
6,400
119.68
US$765,920 		6,400 119.68 US$765,920
2026-02-04 2026-02-04 PrS Proposed sale
2.9
ROBERT M. DAVIS

Officer

Officer
47,434
118.02
US$5,598,137 		47,434 118.02 US$5,598,137
2026-02-04 2026-02-04 PrS Proposed sale
2.6
DEAN LI

Officer

Officer
15,087
118.77
US$1,791,824 		15,087 118.77 US$1,791,824
2026-02-04 2026-02-04 PrS Proposed sale
3.0
CAROLINE A LITCHFIELD

Officer

Officer
41,997
119.61
US$5,023,312 		41,997 119.61 US$5,023,312
2025-11-12 2025-11-10 S Sale
1.4
Downing Cristal N

Chief Comm. & Public Afrs Ofcr

Officer
7,085 -100.0%
87.00
US$616,395 		7,085 -100.0% 87.00 US$616,395
2025-11-10 2025-11-10 PrS Proposed sale
1.4
CRISTAL DOWNING

Officer

Officer
7,085
87.00
US$616,395 		7,085 87.00 US$616,395
2025-11-04 2025-11-03 S Sale
2.7
Williams David Michael

EVP,Chief Info&Digital Officer

Officer
8,614 -26.0%
83.59
US$720,040 		8,614 -26.0% 83.59 US$720,040
2025-11-03 2025-11-03 PrS Proposed sale
2.7
DAVID WILLIAMS

Officer

Officer
8,614
83.59
US$720,040 		8,614 83.59 US$720,040
2025-04-29 2025-04-25 S Sale
2.6
Smart Dalton E. III

SVP Fin. - Global Controller

Officer
4,262 -35.4%
82.76
US$352,723 		4,262 -35.4% 82.76 US$352,723
2025-04-25 2025-04-25 PrS Proposed sale
2.6
DALTON SMART

Officer

Officer
4,262
82.76
US$352,723 		4,262 82.76 US$352,723
2025-02-20 2025-02-19 S Sale
2.5
Oosthuizen Johannes Jacobus

President, U.S. Market

Officer
8,500 -21.7%
84.09
US$714,745 		8,500 -21.7% 84.09 US$714,745
2025-02-19 2025-02-19 PrS Proposed sale
2.5
JOHANNES JACOBUS OOSTHUIZEN

Officer

Officer
8,500
84.09
US$714,745 		8,500 84.09 US$714,745
2025-02-13 2025-02-13 PrS Proposed sale
2.7
DAVID WILLIAMS

Officer

Officer
6,000
85.34
US$512,057 		6,000 85.34 US$512,057
2025-02-13 2025-02-13 S Sale
2.7
Williams David Michael

EVP,Chief Info&Digital Officer

Officer
6,000 -19.9%
85.34
US$512,057 		6,000 -19.9% 85.34 US$512,057
2025-02-07 2025-02-06 B Purchase
3.5
THULIN INGE G
Non-Executive Director
2,833 +2832.9%
88.25
US$250,000 		2,833 +2832.9% 88.25 US$250,000
2025-02-07 2025-02-06 S Sale
1.4
Downing Cristal N

Chief Comm. & Public Afrs Ofcr

Officer
2,361 -25.0%
88.76
US$209,551 		2,361 -25.0% 88.76 US$209,551
2025-02-06 2025-02-06 PrS Proposed sale
1.4
CRISTAL DOWNING

Officer

Officer
2,361
88.76
US$209,551 		2,361 88.76 US$209,551
2025-02-07 2025-02-05 B Purchase
3.6
BAKER DOUGLAS M JR
Non-Executive Director
15,000 +1500.0%
88.50
US$1,327,500 		15,000 +1500.0% 88.50 US$1,327,500
2024-05-06 2024-05-06 PrS Proposed sale
2.8
STEVEN C. MIZELL

Officer

Officer
60,000
127.48
US$7,649,010 		60,000 127.48 US$7,649,010
2024-02-15 2024-02-14 S Sale
3.0
Litchfield Caroline

EVP & CFO

Officer
38,291 -42.9%
125.50
US$4,805,520 		38,291 -42.9% 125.50 US$4,805,520
2024-02-15 2024-02-14 S Sale
2.9
Davis Robert M

Chairman, CEO & President

Executive Director
85,021 -19.6%
125.40
US$10,661,574 		85,021 -19.6% 125.40 US$10,661,574
2024-02-14 2024-02-14 PrS Proposed sale
2.8
RITA KARACHUN

Officer

Officer
26,402
125.53
US$3,314,328 		26,402 125.53 US$3,314,328
2024-02-14 2024-02-14 PrS Proposed sale
3.0
CAROLINE A LITCHFIELD

Officer

Officer
38,291
125.50
US$4,805,520 		38,291 125.50 US$4,805,520
2024-02-14 2024-02-14 PrS Proposed sale
2.9
ROBERT M. DAVIS

Officer

Officer
85,021
125.40
US$10,661,574 		85,021 125.40 US$10,661,574
2024-02-15 2024-02-13 S Sale
2.9
Davis Robert M

Chairman, CEO & President

Executive Director
25,324 -6.8%
126.37
US$3,200,277 		25,324 -6.8% 126.37 US$3,200,277
2024-02-15 2024-02-13 S Sale
2.9
Davis Robert M

Chairman, CEO & President

Executive Director
124,676 -25.0%
125.74
US$15,677,147 		124,676 -25.0% 125.74 US$15,677,147
2024-02-14 2024-02-13 S Sale
2.5
Romanelli Joseph

President, Human Health Int?l

Officer
1,000 -4.9%
124.89
US$124,888 		1,000 -4.9% 124.89 US$124,888
2024-02-13 2024-02-13 PrS Proposed sale
2.5
JOSEPH ROMANELLI

Officer

Officer
1,000
124.89
US$124,888 		1,000 124.89 US$124,888
2024-02-13 2024-02-13 PrS Proposed sale
2.9
ROBERT M. DAVIS

Officer

Officer
150,000
125.81
US$18,872,130 		150,000 125.81 US$18,872,130
2024-02-12 2024-02-09 S Sale
2.6
Li Dean Y

Executive VP & President, MRL

Officer
14,702 -24.1%
125.50
US$1,845,083 		14,702 -24.1% 125.50 US$1,845,083
2024-02-09 2024-02-09 PrS Proposed sale
2.6
DEAN LI

Officer

Officer
14,702
125.50
US$1,845,083 		14,702 125.50 US$1,845,083
2024-02-08 2024-02-07 S Sale
2.7
Williams David Michael

EVP,Chief Info&Digital Officer

Officer
1,451 -6.8%
127.57
US$185,108 		1,451 -6.8% 127.57 US$185,108
2024-02-07 2024-02-07 PrS Proposed sale
2.7
DAVID WILLIAMS

Officer

Officer
1,451
127.57
US$185,108 		1,451 127.57 US$185,108
2024-02-05 2024-02-02 S Sale
2.5
Oosthuizen Johannes Jacobus

President, U.S. Market

Officer
18,959 -44.8%
127.18
US$2,411,111 		18,959 -44.8% 127.18 US$2,411,111
2024-02-02 2024-02-02 PrS Proposed sale
2.5
JOHANNES JACOBUS OOSTHUIZEN

Officer

Officer
18,959
127.18
US$2,411,111 		18,959 127.18 US$2,411,111
2024-02-02 2024-02-02 PrS Proposed sale
2.5
JENNIFER ZACHARY

Officer

Officer
49,499
126.97
US$6,284,779 		49,499 126.97 US$6,284,779
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