Company · Ownership research

Merck & Co., Inc. MRK

CIK 0000310158

Form 4 transactions dated Sep 1, 2023 to Sep 28, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 87 rows; the complete set is available through the API.

Insider filings on file run through 2026-08-13.

Insider purchases & sales

Purchased: $1.58M
Sold: $130.23M

Sep 1, 2023 – Aug 13, 2026
Available records · partial months are marked ·

20258 of 8 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2025-11-10	Downing Cristal N Chief Comm. & Public Afrs Ofcr	Sale	$616.39K 7,085 shares sold	100.00% sold Direct holding	▾
2025-11-03	Williams David Michael EVP,Chief Info&Digital Officer	Sale	$720.04K 8,614 shares sold	25.95% sold Direct holding	▾
2025-04-25	Smart Dalton E. III SVP Fin. - Global Controller	Sale	$352.72K 4,262 shares sold	35.40% sold Direct holding	▾
2025-02-19	Oosthuizen Johannes Jacobus President, U.S. Market	Sale	$714.74K 8,500 shares sold	21.68% sold Direct holding	▾
2025-02-13	Williams David Michael EVP,Chief Info&Digital Officer	Sale	$512.06K 6,000 shares sold	19.92% sold Direct holding	▾
2025-02-06	THULIN INGE G Director	Purchase	$250.00K 2,833 shares bought	2832.86% added Direct holding	▾
2025-02-06	Downing Cristal N Chief Comm. & Public Afrs Ofcr	Sale	$209.55K 2,361 shares sold	24.99% sold Direct holding	▾
2025-02-05	BAKER DOUGLAS M JR Director	Purchase	$1.33M 15,000 shares bought	1500.00% added Direct holding	▾

Showing 8 / 8 record groups in 2025. The complete set is available through the API.

Merck & Co., Inc. · MRK

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 8 of 8 purchase / sale groups and 30 of 87 other groups; the totals and the monthly series cover the whole window.

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{"ticker":"MRK","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.