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Merck & Co., Inc. planned insider sales

In the last twelve months insiders at Merck & Co., Inc. filed 22 Form 144 notices of planned sales, 597,093 shares worth $74.4 million at the time of filing, from 14 sellers. The latest, filed 2 November 2026: David M Williams (officer), 21,359 shares worth $3.2 million, planned for around 2 November 2026 through Morgan Stanley Smith Barney LLC Executive Financial Services.

FiledSellerRelationshipSharesValuePlanned saleSold, per Form 4BrokerHow acquiredFiling
2 November 2026David M WilliamsOfficer21,359$3.2 million2 November 2026None on Form 4 yetMorgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Options Under a Registered PlanForm 144
13 August 2026Chirfi GuindoOfficer10,000$1.4 million13 August 202610,000 shares from 13 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Vesting Under a Registered PlanForm 144
12 August 2026Richard Robert Deluca JrOfficer11,699$1.5 million12 August 202624,536 shares from 11 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Vesting Under a Registered PlanForm 144
12 August 2026Jennifer L ZacharyOfficer80,315$10.7 million12 August 202680,315 shares from 12 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Options Under a Registered Plan; Restricted Stock Vesting Under a Registered PlanForm 144
11 August 2026Richard Robert Deluca JrOfficer12,837$1.7 million11 August 202620,784 shares from 10 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Vesting Under a Registered PlanForm 144
10 August 2026Richard Robert Deluca JrOfficer20,784$2.7 million10 August 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Vesting Under a Registered PlanForm 144
6 August 2026Richard Robert Deluca JrOfficer6,050$788,7736 August 20266,050 shares from 6 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Vesting Under a Registered PlanForm 144
6 August 2026Chirfi GuindoOfficer15,000$2.0 million6 August 202615,000 shares from 6 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Vesting Under a Registered PlanForm 144
5 August 2026David MaraldoOfficer18,706$2.4 million5 August 202618,706 shares from 5 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Options Under a Registered PlanForm 144
5 August 2026David M WilliamsOfficer52,847$6.8 million5 August 202652,847 shares from 5 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Options Under a Registered PlanForm 144
10 February 2026Dean LiOfficer10,235$1.2 million10 February 202610,235 shares from 10 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted stock vesting under a registered planForm 144
9 February 2026Chirfi GuindoOfficer20,000$2.4 million9 February 202620,000 shares from 9 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted stock vesting under a registered planForm 144
9 February 2026Jennifer ZacharyOfficer121,573$14.5 million9 February 2026121,573 shares from 9 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of options under a registered planForm 144
6 February 2026David WilliamsOfficer5,000$609,5256 February 20265,000 shares from 6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of options under a registered planForm 144
6 February 2026Johannes Jacobus OosthuizenOfficer15,000$1.8 million6 February 202615,000 shares from 6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPrivate Acquisition from Issuer/Affiliate; Restricted stock vesting under a registered planForm 144
6 February 2026Richard Robert Deluca Jr.Officer37,685$4.6 million6 February 202637,685 shares from 6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted stock vesting under a registered planForm 144
5 February 2026Chirfi GuindoOfficer20,000$2.4 million5 February 202620,000 shares from 5 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted stock vesting under a registered planForm 144
4 February 2026Dalton SmartOfficer6,400$765,9204 February 20266,400 shares from 4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of options under a registered plan; Restricted stock vesting under a registered planForm 144
4 February 2026Dean LiOfficer15,087$1.8 million4 February 202615,087 shares from 4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of options under a registered planForm 144
4 February 2026Caroline A LitchfieldOfficer41,997$5.0 million4 February 202641,997 shares from 4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of options under a registered planForm 144
4 February 2026Robert M. DavisOfficer47,434$5.6 million4 February 202647,434 shares from 4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted stock vesting under a registered planForm 144
10 November 2025Cristal DowningOfficer7,085$616,39510 November 20257,085 shares from 10 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted stock vesting under a registered planForm 144
A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was.
Read moreValue is the filer's own aggregate market value. Sold, per Form 4: the same seller's open-market sales on Form 4 from the notice's date to 90 days after, added up, as they appear on the insiders page; a holder who files no Form 4, such as some large holders, never shows one. What is a Form 144?