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Company / CIK 0000310158

Merck & Co., Inc.

MRK · 8 insiders on file

Merck & Co., Inc. (MRK) has 8 insiders on file who disclosed 36 transactions in the last 12 months (0 open-market buys, 17 sales, about $41.5M at reported prices). No federal award to a recipient with exactly this name appears in the last 180 days; no lobbying filing names it as client this year.

Last updated August 13, 2026 · Sources: SEC EDGAR; USAspending; Senate LDA

Insiders

NameRoleTransactionsLast filed
Guindo ChirfiEVP, Access, Policy & Comms2August 13, 2026
Zachary JenniferEVP, General Counsel5August 13, 2026
DeLuca Richard R.EVP&Pres, Merck Animal Heallth8August 12, 2026
Maraldo David R.EVP & Pres. MMD9August 7, 2026
Williams David MichaelEVP,Chief Info&Digital Officer9August 7, 2026
Seidman Christine EDirector1July 1, 2026
Karsanbhai Surendralal LancaDirector1July 1, 2026
Coe Mary EllenDirector1July 1, 2026

Insider transactions

FilerSecuritySideTrade dateDisclosedLagSharesPriceValueFlagsSource
Zachary JenniferMRKOption / conversion MAugust 12, 2026August 13, 20261d13,433——derivativeForm 4 ↗
Zachary JenniferMRKOption / conversion MAugust 12, 2026August 13, 20261d41,494——derivativeForm 4 ↗
Zachary JenniferMRKSell SAugust 12, 2026August 13, 20261d80,315$133$10.7MForm 4 ↗
Zachary JenniferMRKOption / conversion MAugust 12, 2026August 13, 20261d13,433$85$1.1MForm 4 ↗
Zachary JenniferMRKOption / conversion MAugust 12, 2026August 13, 20261d41,494$118$4.9MForm 4 ↗
Guindo ChirfiMRKSell SAugust 13, 2026August 13, 20260d10,000$135$1.4MForm 4 ↗
DeLuca Richard R.MRKSell SAugust 12, 2026August 12, 20260d600$132$79KForm 4 ↗
DeLuca Richard R.MRKSell SAugust 12, 2026August 12, 20260d11,099$132$1.5MForm 4 ↗
DeLuca Richard R.MRKSell SAugust 11, 2026August 12, 20261d5,427$132$718KForm 4 ↗
DeLuca Richard R.MRKSell SAugust 11, 2026August 12, 20261d7,410$131$973KForm 4 ↗
DeLuca Richard R.MRKSell SAugust 10, 2026August 12, 20262d20,784$130$2.7MForm 4 ↗
DeLuca Richard R.MRKSell SAugust 6, 2026August 10, 20264d300$131$39KForm 4 ↗
DeLuca Richard R.MRKSell SAugust 6, 2026August 10, 20264d4,945$130$644KForm 4 ↗
DeLuca Richard R.MRKSell SAugust 6, 2026August 10, 20264d805$131$105KForm 4 ↗
Guindo ChirfiMRKSell SAugust 6, 2026August 7, 20261d15,000$131$2.0MForm 4 ↗
Williams David MichaelMRKOption / conversion MAugust 5, 2026August 7, 20262d34,705——derivativeForm 4 ↗
Williams David MichaelMRKOption / conversion MAugust 5, 2026August 7, 20262d13,542——derivativeForm 4 ↗
Williams David MichaelMRKOption / conversion MAugust 5, 2026August 7, 20262d4,600——derivativeForm 4 ↗
Williams David MichaelMRKSell SAugust 5, 2026August 7, 20262d34,705$129$4.5MForm 4 ↗
Williams David MichaelMRKOption / conversion MAugust 5, 2026August 7, 20262d34,705$74$2.6MForm 4 ↗
Williams David MichaelMRKSell SAugust 5, 2026August 7, 20262d13,542$129$1.7MForm 4 ↗
Williams David MichaelMRKOption / conversion MAugust 5, 2026August 7, 20262d13,542$75$1.0MForm 4 ↗
Williams David MichaelMRKSell SAugust 5, 2026August 7, 20262d4,600$129$592KForm 4 ↗
Williams David MichaelMRKOption / conversion MAugust 5, 2026August 7, 20262d4,600$78$357KForm 4 ↗
Maraldo David R.MRKOption / conversion MAugust 5, 2026August 7, 20262d2,686——derivativeForm 4 ↗
Maraldo David R.MRKOption / conversion MAugust 5, 2026August 7, 20262d9,709——derivativeForm 4 ↗
Maraldo David R.MRKOption / conversion MAugust 5, 2026August 7, 20262d6,311——derivativeForm 4 ↗
Maraldo David R.MRKSell SAugust 5, 2026August 7, 20262d2,686$129$346KForm 4 ↗
Maraldo David R.MRKOption / conversion MAugust 5, 2026August 7, 20262d2,686$85$228KForm 4 ↗
Maraldo David R.MRKSell SAugust 5, 2026August 7, 20262d9,709$129$1.2MForm 4 ↗
Maraldo David R.MRKOption / conversion MAugust 5, 2026August 7, 20262d9,709$87$846KForm 4 ↗
Maraldo David R.MRKSell SAugust 5, 2026August 7, 20262d6,311$129$812KForm 4 ↗
Maraldo David R.MRKOption / conversion MAugust 5, 2026August 7, 20262d6,311$74$465KForm 4 ↗
Coe Mary EllenMRKOther AJune 30, 2026July 1, 20261d233$129$30KderivativeForm 4 ↗
Karsanbhai Surendralal LancaMRKOther AJune 30, 2026July 1, 20261d126$129$16KderivativeForm 4 ↗
Seidman Christine EMRKOther AJune 30, 2026July 1, 20261d63$129$8,125derivativeForm 4 ↗

Federal contracts (USAspending, last 180 days)

No award action to a recipient named exactly "Merck & Co., Inc." in the last 180 days. Subsidiaries and differently-spelled recipients are not matched — search contracts.

Lobbying (Senate LDA, as client)

No LDA filing names "Merck & Co., Inc." as the client in the last two years. Filings under a subsidiary or trade-association name are not matched — search lobbying.

Sources and method

Insiders and their transactions come from SEC EDGAR Form 4 filings for this issuer. Contracts and lobbying are matched by exact normalized name (suffixes like Inc./Corp. ignored) to USAspending recipients and LDA clients — a conservative match that misses subsidiaries on purpose. See methodology and corrections.

Not investment advice. Public records shown as filed; no recommendation is made or implied.