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

Over the last 3 months, MRK insiders made 0 open-market buys and 13 sales, a net sale of -$25.6M (SEC Form 4). Over the last 6 months, 3075 institutions increased and 3131 reduced their position (13F).

Insider Activity

Sentiment
0/100
Buys (3m)
0
Sells (3m)
13
Net (3m)
-$25.6M
Insider trades by month Buys Sells
Feb
Apr
Nov
Feb
Aug
Context3-month price +28.4%Institutions mixed (13F)
DateInsiderTypeSharesPrice
Aug 13, 2026Zachary Jenniferofficer: EVP, General CounselOption41,494$117.89
Aug 13, 2026Zachary Jenniferofficer: EVP, General CounselOption13,433$84.71
Aug 13, 2026Guindo Chirfiofficer: EVP, Access, Policy & CommsSell10,000$135.00
Aug 13, 2026Zachary Jenniferofficer: EVP, General CounselSell80,315$133.46
Aug 12, 2026DeLuca Richard R.officer: EVP&Pres, Merck Animal HeallthSell5,427$132.35
Aug 12, 2026DeLuca Richard R.officer: EVP&Pres, Merck Animal HeallthSell600$132.04
Aug 12, 2026DeLuca Richard R.officer: EVP&Pres, Merck Animal HeallthSell7,410$131.33
Aug 12, 2026DeLuca Richard R.officer: EVP&Pres, Merck Animal HeallthSell11,099$131.61
Aug 12, 2026DeLuca Richard R.officer: EVP&Pres, Merck Animal HeallthSell20,784$130.43
Aug 10, 2026DeLuca Richard R.officer: EVP&Pres, Merck Animal HeallthSell4,945$130.23
Aug 10, 2026DeLuca Richard R.officer: EVP&Pres, Merck Animal HeallthSell300$131.02
Aug 10, 2026DeLuca Richard R.officer: EVP&Pres, Merck Animal HeallthSell805$131.02
Aug 7, 2026Maraldo David R.officer: EVP & Pres. MMDSell2,686$128.72
Aug 7, 2026Maraldo David R.officer: EVP & Pres. MMDOption2,686$84.71
Aug 7, 2026Williams David Michaelofficer: EVP,Chief Info&Digital OfficerOption34,705$73.73
Aug 7, 2026Maraldo David R.officer: EVP & Pres. MMDOption6,311$73.73
Aug 7, 2026Williams David Michaelofficer: EVP,Chief Info&Digital OfficerOption4,600$77.62
Aug 7, 2026Guindo Chirfiofficer: EVP, Access, Policy & CommsSell15,000$131.00
Aug 7, 2026Maraldo David R.officer: EVP & Pres. MMDOption9,709$87.10
Aug 7, 2026Williams David Michaelofficer: EVP,Chief Info&Digital OfficerOption13,542$75.36
Aug 7, 2026Williams David Michaelofficer: EVP,Chief Info&Digital OfficerSell34,705$128.77
Jul 1, 2026Seidman Christine EdirectorGrant63
Jul 1, 2026Coe Mary EllendirectorGrant233
Jul 1, 2026Karsanbhai Surendralal LancadirectorGrant126
Jun 2, 2026Seidman Christine EdirectorGrant1,853
Jun 2, 2026LAVIZZO-MOUREY RISA JdirectorGrant1,853
Jun 2, 2026THULIN INGE GdirectorGrant1,853
Jun 2, 2026Warden Kathy JdirectorGrant1,853
Jun 2, 2026GLOCER THOMAS HdirectorGrant1,853
Jun 2, 2026Coe Mary EllendirectorGrant1,853

Source: MRK SEC Form 4 filings, latest Aug 13, 2026. For informational purposes only — not investment advice.

Institutional activity (13F)

How institutions changed their MRK positions over the last 6 months (SEC Form 13F).

Increased
3075
New positions
561
Reduced
3131
Sold out
130
Largest moves
InstitutionActionSharesFiled
BlackRock, Inc.Increased227.0MAug 7, 2026
BLACKROCK, INC.Increased225.9MMay 13, 2026
VANGUARD CAPITAL MANAGEMENT LLCIncreased161.3MAug 13, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position161.0MMay 15, 2026
STATE STREET CORPIncreased120.4MAug 7, 2026
STATE STREET CORPReduced119.3MMay 15, 2026
WELLINGTON MANAGEMENT GROUP LLPIncreased86.2MAug 14, 2026
WELLINGTON MANAGEMENT GROUP LLPReduced84.3MMay 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCIncreased67.7MAug 13, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCNew Position67.3MMay 8, 2026
GEODE CAPITAL MANAGEMENT, LLCIncreased60.7MAug 12, 2026
GEODE CAPITAL MANAGEMENT, LLCReduced59.6MMay 15, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INCIncreased54.4MAug 14, 2026
JPMORGAN CHASE & COIncreased53.0MMay 13, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INCIncreased49.8MMay 15, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.