MRK

Merck & Co.

XNYS · PHARMACEUTICAL PREPARATIONS

6 articles20 insider tx0 holders0 supply chain9 selling intent filings2 new insiders

Research articles

Includes notes from domestic 8-K and foreign private issuer 6-K disclosures.

SELLING INTENT

Merck &'s Chirfi Guindo (Officer) Filed Intent to Sell 10,000 Shares (~$1.4M)

Merck & (MRK) had 1 Form 144 pre-sale notice filed on 2026-08-13. Form 144 filings signal an insider's intent to sell securities under SEC Rule 144 — they do not confirm a completed transaction.

8/14/2026

SELLING INTENT

2 Merck & Insiders Filed Intent to Sell 92,014 Shares (~$12.3M)

Merck & (MRK) had 2 Form 144 pre-sale notices filed on 2026-08-12. Form 144 filings signal an insider's intent to sell securities under SEC Rule 144 — they do not confirm a completed transaction.

8/13/2026

SELLING INTENT

Merck &'s Richard Robert Deluca Jr (Officer) Filed Intent to Sell 12,837 Shares (~$1.7M)

Merck & (MRK) had 1 Form 144 pre-sale notice filed on 2026-08-11. Form 144 filings signal an insider's intent to sell securities under SEC Rule 144 — they do not confirm a completed transaction.

8/12/2026

SELLING INTENT

Merck &'s Richard Robert Deluca Jr (Officer) Filed Intent to Sell 20,784 Shares (~$2.7M)

Merck & (MRK) had 1 Form 144 pre-sale notice filed on 2026-08-10. Form 144 filings signal an insider's intent to sell securities under SEC Rule 144 — they do not confirm a completed transaction.

8/11/2026

SELLING INTENT

2 Merck & Insiders Filed Intent to Sell 21,050 Shares (~$2.8M)

Merck & (MRK) had 2 Form 144 pre-sale notices filed on 2026-08-06. Form 144 filings signal an insider's intent to sell securities under SEC Rule 144 — they do not confirm a completed transaction.

8/7/2026

SELLING INTENT

2 Merck & Insiders Filed Intent to Sell 71,553 Shares (~$9.2M)

Merck & (MRK) had 2 Form 144 pre-sale notices filed on 2026-08-05. Form 144 filings signal an insider's intent to sell securities under SEC Rule 144 — they do not confirm a completed transaction.

8/6/2026

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Recent insider activity

open-market Form 4 only - grants, exercises, tax withholding excluded

0 buyers - 5 unique sellers · Institutional activity: not available - insufficient comparable institutions for the latest complete quarter.

Date	Insider	Title	Type	Shares	Price	Value
August 13, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	SELL	-10,000	$135	~$1.4M
August 12, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	SELL	-11,099	$132	~$1.5M
August 12, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	SELL	-600	$132	~$79K
August 12, 2026	Zachary Jennifer	EVP, General Counsel	SELL	-80,315	$133	~$10.7M
August 12, 2026	Zachary Jennifer	EVP, General Counsel	OPTION_EXERCISE	-41,494	—	—
August 12, 2026	Zachary Jennifer	EVP, General Counsel	OPTION_EXERCISE	-13,433	—	—
August 12, 2026	Zachary Jennifer	EVP, General Counsel	OPTION_EXERCISE	41,494	$118	~$4.9M
August 12, 2026	Zachary Jennifer	EVP, General Counsel	OPTION_EXERCISE	13,433	$85	~$1.1M
August 11, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	SELL	-7,410	$131	~$1.0M
August 11, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	SELL	-5,427	$132	~$0.7M
August 10, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	SELL	-20,784	$130	~$2.7M
August 6, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	SELL	-15,000	$131	~$2.0M
August 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	SELL	-805	$131	~$0.1M
August 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	SELL	-4,945	$130	~$0.6M
August 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	SELL	-300	$131	~$39K
August 5, 2026	Maraldo David R.	EVP & Pres. MMD	OPTION_EXERCISE	6,311	$74	~$0.5M
August 5, 2026	Maraldo David R.	EVP & Pres. MMD	SELL	-6,311	$129	~$0.8M
August 5, 2026	Maraldo David R.	EVP & Pres. MMD	OPTION_EXERCISE	9,709	$87	~$0.8M
August 5, 2026	Maraldo David R.	EVP & Pres. MMD	SELL	-9,709	$129	~$1.2M
August 5, 2026	Maraldo David R.	EVP & Pres. MMD	OPTION_EXERCISE	2,686	$85	~$0.2M

Insider Selling Intent (Form 144)

Date	Filer	Relationship	Est. shares	Filing
August 13, 2026	Chirfi Guindo	—	10,000	SEC
August 12, 2026	Jennifer L Zachary	—	80,315	SEC
August 12, 2026	Richard Robert Deluca Jr	—	11,699	SEC
August 11, 2026	Richard Robert Deluca Jr	—	12,837	SEC
August 10, 2026	Richard Robert Deluca Jr	—	20,784	SEC
August 6, 2026	Chirfi Guindo	—	15,000	SEC
August 6, 2026	Richard Robert Deluca Jr	—	6,050	SEC
August 5, 2026	David M Williams	—	52,847	SEC
August 5, 2026	David Maraldo	—	18,706	SEC

New Insiders (Form 3)

Date	Insider	Title	Relationship	Shares	Filing
September 1, 2026	—	—	—	—	SEC
May 4, 2026	—	—	—	—	SEC

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