Merck & Co., Inc.

MRKNYSEHealthcare● Active

$120.79

+$0.53(+0.44%)

Market Cap$298.3B

P/E Ratio—

52W High$125.14

52W Low$76.66

Avg Volume9.5M

Open$120.94

Beta0.22

Insider Trades Ownership Employees

Merck & Co., Inc. (MRK) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · MRK · as of Jun 8, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

0.00

Buy/Sell (by trades)

Overall sentiment

BEARISH

↑ Buy 0%Active transactions only · RSU vesting excluded100% Sell ↓

Merck & Co., Inc. insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 8, 2026

MRK insider buying and selling by quarter

MRK insider selling · MRK insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

734K367K0

2024 Q3

2024 Q4

2025 Q1

2025 Q2

2025 Q3

2025 Q4

2026 Q1

2026 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 8, 2026

Active insiders

Most active in past 12 months · MRK ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

MRK executive sell shares · MRK board member insider trading · MRK insider trading SEC filing

Showing 36 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
May 2, 2026	Smart Dalton E. III SVP Fin. - Global Controller	Option	383	$112.16	$43K	9,520.315	Form 4
May 2, 2026	Smart Dalton E. III SVP Fin. - Global Controller	Other	132	$112.16	$15K	9,388.315	Form 4
May 2, 2026	Maraldo David R. EVP & Pres. MMD	Option	552	$112.16	$62K	18,371.434	Form 4
May 2, 2026	Maraldo David R. EVP & Pres. MMD	Other	159	$112.16	$18K	18,212.434	Form 4
Apr 29, 2026	Guindo Chirfi EVP, Access, Policy & Comms	Option	1,967	$110.03	$216K	62,582.127	Form 4
Apr 29, 2026	Guindo Chirfi EVP, Access, Policy & Comms	Other	969	$110.03	$107K	61,613.127	Form 4
Apr 29, 2026	Chattopadhyay Sanat Exe V-P & Pres. MMD	Option	2,597	$110.03	$286K	16,477	Form 4
Apr 29, 2026	Chattopadhyay Sanat Exe V-P & Pres. MMD	Other	1,130	$110.03	$124K	15,347	Form 4
Apr 29, 2026	DeLuca Richard R. EVP&Pres, Merck Animal Heallth	Option	2,518	$110.03	$277K	162,778.07	Form 4
Apr 29, 2026	DeLuca Richard R. EVP&Pres, Merck Animal Heallth	Other	1,241	$110.03	$137K	161,537.07	Form 4
Apr 29, 2026	Williams David Michael EVP,Chief Info&Digital Officer	Option	1,377	$110.03	$152K	32,395.037	Form 4
Apr 29, 2026	Williams David Michael EVP,Chief Info&Digital Officer	Other	679	$110.03	$75K	31,716.037	Form 4
Apr 30, 2026	Smart Dalton E. III SVP Fin. - Global Controller	Option	464	$110.95	$51K	9,296.315	Form 4
Apr 29, 2026	Smart Dalton E. III SVP Fin. - Global Controller	Option	944	$110.03	$104K	9,156.315	Form 4
Apr 30, 2026	Smart Dalton E. III SVP Fin. - Global Controller	Other	159	$110.95	$18K	9,137.315	Form 4
Apr 29, 2026	Smart Dalton E. III SVP Fin. - Global Controller	Other	324	$110.03	$36K	8,832.315	Form 4
Apr 29, 2026	Li Dean Y Executive VP & President, MRL	Option	4,722	$110.03	$520K	96,757.05	Form 4
Apr 29, 2026	Li Dean Y Executive VP & President, MRL	Other	2,326	$110.03	$256K	94,431.05	Form 4
Apr 29, 2026	Zachary Jennifer EVP, General Counsel	Option	2,951	$110.03	$325K	72,351.254	Form 4
Apr 29, 2026	Zachary Jennifer EVP, General Counsel	Other	1,454	$110.03	$160K	70,897.254	Form 4
Apr 30, 2026	Larson Betty D EVP, Chief HR Officer	Option	11,350	$110.95	$1.26M⚡	18,917	Form 4
Apr 30, 2026	Larson Betty D EVP, Chief HR Officer	Other	5,143	$110.95	$571K	13,774	Form 4
Apr 29, 2026	Larson Betty D EVP, Chief HR Officer	Option	2,085	$110.03	$229K	8,282	Form 4
Apr 29, 2026	Larson Betty D EVP, Chief HR Officer	Other	715	$110.03	$79K	7,567	Form 4
Apr 29, 2026	Litchfield Caroline EVP & CFO	Option	3,935	$110.03	$433K	94,238.657	Form 4

Smart Dalton E. III

SVP Fin. - Global Controller

Option

Date

May 2

383

Price

$112.16

Value

$43K

View Form 4 on SEC.gov

Smart Dalton E. III

SVP Fin. - Global Controller

Other

Date

May 2

132

Price

$112.16

Value

$15K

View Form 4 on SEC.gov

Maraldo David R.

EVP & Pres. MMD

Option

Date

May 2

552

Price

$112.16

Value

$62K

View Form 4 on SEC.gov

Maraldo David R.

EVP & Pres. MMD

Other

Date

May 2

159

Price

$112.16

Value

$18K

View Form 4 on SEC.gov

Guindo Chirfi

EVP, Access, Policy & Comms

Option

Date

Apr 29

1,967

Price

$110.03

Value

$216K

View Form 4 on SEC.gov

Guindo Chirfi

EVP, Access, Policy & Comms

Other

Date

Apr 29

969

Price

$110.03

Value

$107K

View Form 4 on SEC.gov

Chattopadhyay Sanat

Exe V-P & Pres. MMD

Option

Date

Apr 29

2,597

Price

$110.03

Value

$286K

View Form 4 on SEC.gov

Chattopadhyay Sanat

Exe V-P & Pres. MMD

Other

Date

Apr 29

1,130

Price

$110.03

Value

$124K

View Form 4 on SEC.gov

DeLuca Richard R.

EVP&Pres, Merck Animal Heallth

Option

Date

Apr 29

2,518

Price

$110.03

Value

$277K

View Form 4 on SEC.gov

DeLuca Richard R.

EVP&Pres, Merck Animal Heallth

Other

Date

Apr 29

1,241

Price

$110.03

Value

$137K

View Form 4 on SEC.gov

Williams David Michael

EVP,Chief Info&Digital Officer

Option

Date

Apr 29

1,377

Price

$110.03

Value

$152K

View Form 4 on SEC.gov

Williams David Michael

EVP,Chief Info&Digital Officer

Other

Date

Apr 29

679

Price

$110.03

Value

$75K

View Form 4 on SEC.gov

Smart Dalton E. III

SVP Fin. - Global Controller

Option

Date

Apr 30

464

Price

$110.95

Value

$51K

View Form 4 on SEC.gov

Smart Dalton E. III

SVP Fin. - Global Controller

Option

Date

Apr 29

944

Price

$110.03

Value

$104K

View Form 4 on SEC.gov

Smart Dalton E. III

SVP Fin. - Global Controller

Other

Date

Apr 30

159

Price

$110.95

Value

$18K

View Form 4 on SEC.gov

Smart Dalton E. III

SVP Fin. - Global Controller

Other

Date

Apr 29

324

Price

$110.03

Value

$36K

View Form 4 on SEC.gov

Li Dean Y

Executive VP & President, MRL

Option

Date

Apr 29

4,722

Price

$110.03

Value

$520K

View Form 4 on SEC.gov

Li Dean Y

Executive VP & President, MRL

Other

Date

Apr 29

2,326

Price

$110.03

Value

$256K

View Form 4 on SEC.gov

Zachary Jennifer

EVP, General Counsel

Option

Date

Apr 29

2,951

Price

$110.03

Value

$325K

View Form 4 on SEC.gov

Zachary Jennifer

EVP, General Counsel

Other

Date

Apr 29

1,454

Price

$110.03

Value

$160K

View Form 4 on SEC.gov

Larson Betty D

EVP, Chief HR Officer

Option

Date

Apr 30

11,350

Price

$110.95

Value

$1.26M ⚡

View Form 4 on SEC.gov

Larson Betty D

EVP, Chief HR Officer

Other

Date

Apr 30

5,143

Price

$110.95

Value

$571K

View Form 4 on SEC.gov

Larson Betty D

EVP, Chief HR Officer

Option

Date

Apr 29

2,085

Price

$110.03

Value

$229K

View Form 4 on SEC.gov

Larson Betty D

EVP, Chief HR Officer

Other

Date

Apr 29

715

Price

$110.03

Value

$79K

View Form 4 on SEC.gov

Litchfield Caroline

EVP & CFO

Option

Date

Apr 29

3,935

Price

$110.03

Value

$433K

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 2

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About MRK insider trading

MRK insider trades

Merck & Co., Inc. (MRK) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Smart Dalton E. III (SVP Fin. - Global Controller), Zachary Jennifer (EVP, General Counsel), Guindo Chirfi (EVP, Access, Policy & Comms). Over the past 12 months, 5 insiders have filed transactions with the SEC. MRK insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Merck & Co., Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

MRK insider trading · 5 questions

The insiders of Merck & Co., Inc. (MRK) include executives and directors such as Smart Dalton E. III (SVP Fin. - Global Controller), Zachary Jennifer (EVP, General Counsel), Guindo Chirfi (EVP, Access, Policy & Comms), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

MRK board member insider tradingwho are MRK insidersMRK insider rosterMerck & Co., Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026