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Public ownership evidence

Merck & Co., Inc. (MRK) Ownership Disclosures

Read MRK insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

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2026-10-012026-09-30Seidman Christine EA55.91Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-09-30 and its public availability date is 2026-10-01. Subtracting those calendar dates gives 1 day of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code A: a award. An award is an acquisition but is not an open-market purchase. A purchase-following rule must not count it as code P.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0000310158-26-000234 ↗SEC 0000310158-26-000232 ↗SEC 0000310158-26-000230 ↗

Recent Form 4 activity

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2026-10-012026-09-30Seidman Christine EA55.91Not reported
2026-10-012026-09-30Karsanbhai Surendralal LancaA111.83Not reported
2026-10-012026-09-30Coe Mary EllenA206.46Not reported
2026-08-142026-08-13Guindo ChirfiS10,000Not reported
2026-08-142026-08-12Zachary JenniferS80,315Not reported
2026-08-132026-08-12DeLuca Richard R.S600Not reported
2026-08-132026-08-12DeLuca Richard R.S11,099Not reported
2026-08-132026-08-11DeLuca Richard R.S5,427Not reported
2026-08-132026-08-11DeLuca Richard R.S7,410Not reported
2026-08-132026-08-10DeLuca Richard R.S20,784Not reported
2026-08-112026-08-06DeLuca Richard R.S300Not reported
2026-08-112026-08-06DeLuca Richard R.S4,945Not reported
2026-08-112026-08-06DeLuca Richard R.S805Not reported
2026-08-082026-08-05Maraldo David R.S2,686Not reported
2026-08-082026-08-05Maraldo David R.S9,709Not reported
2026-08-082026-08-05Maraldo David R.S6,311Not reported
2026-08-082026-08-05Williams David MichaelS34,705Not reported
2026-08-082026-08-05Williams David MichaelS13,542Not reported
2026-08-082026-08-05Williams David MichaelS4,600Not reported
2026-08-082026-08-06Guindo ChirfiS15,000Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

Inspect all 50 displayed rows: Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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Cornerstone Financial Management LLC2026-06-302026-08-29965$124,003None
Cornerstone Financial Management LLC2026-03-312026-08-29822$98,878None
Cornerstone Financial Management LLC2025-12-312026-08-29779$81,998None
B. Riley Wealth Advisors, Inc.2025-03-312026-08-295,040$452,378Call
B. Riley Wealth Advisors, Inc.2025-03-312026-08-29115,573$10,373,796None
Advisors Asset Management, Inc.2021-12-312026-08-28727,121$55,726,553None
Advisors Asset Management, Inc.2022-12-312026-08-28605,806$67,214,176None
Advisors Asset Management, Inc.2020-06-302026-08-28148,055$11,449,093None
Advisors Asset Management, Inc.2022-06-302026-08-28729,138$66,476,000None
Advisors Asset Management, Inc.2021-09-302026-08-28665,600$49,993,000None
Corient Private Wealth LP2026-06-302026-08-282,313,423$297,309,140None
Corient Private Wealth LP2026-06-302026-08-2877,890$10,008,866None
Redwood Investment Management, LLC2024-12-312026-08-283,641$362,000None
Redwood Investment Management, LLC2025-03-312026-08-2825,779$2,314,000None
BOSTON RESEARCH & MANAGEMENT INC2025-12-312026-08-2865,994$6,946,560None
Formuepleje A/S2024-03-312026-08-28104,682$13,812,790None
Formuepleje A/S2023-12-312026-08-28111,117$12,113,975None
Formuepleje A/S2023-09-302026-08-28123,340$12,697,853None
Formuepleje A/S2023-06-302026-08-28104,157$12,018,676None
Formuepleje A/S2023-03-312026-08-28120,890$12,861,487None
Formuepleje A/S2022-12-312026-08-28116,215$12,894,054None
Formuepleje A/S2022-09-302026-08-2849,989$4,305,053None
Formuepleje A/S2014-03-312026-08-287,528$427,365None
Wellington Grp LLC2026-06-302026-08-2726,263$3,374,796None
Reflection Asset Management2026-03-312026-08-273,952$474,455None
Legacy Edge Advisors, LLC2025-09-302026-08-272,534$212,700None
HORAN Wealth, LLC2026-06-302026-08-2746,341$5,954,868None
Principia Wealth Advisory, LLC2026-06-302026-08-271,013$130,213None
Principia Wealth Advisory, LLC2026-03-312026-08-27963$115,794None
Advisors Asset Management, Inc.2024-03-312026-08-27308,317$40,682,428None
Advisors Asset Management, Inc.2025-03-312026-08-27287,780$25,831,133None
Advisors Asset Management, Inc.2022-09-302026-08-27674,475$58,086,000None
Advisors Asset Management, Inc.2020-12-312026-08-27293,165$23,981,000None
Advisors Asset Management, Inc.2022-03-312026-08-27761,723$62,499,372None
Advisors Asset Management, Inc.2023-06-302026-08-27447,724$51,662,872None
Advisors Asset Management, Inc.2023-09-302026-08-27417,746$43,006,951None
Advisors Asset Management, Inc.2023-03-312026-08-27532,680$56,671,825None
Advisors Asset Management, Inc.2021-03-312026-08-27393,593$30,342,084None
Advisors Asset Management, Inc.2021-06-302026-08-27575,797$44,780,000None
Advisors Asset Management, Inc.2020-09-302026-08-27185,438$15,382,082None
Advisors Asset Management, Inc.2025-09-302026-08-27340,309$28,562,134None
Advisors Asset Management, Inc.2023-12-312026-08-27336,879$36,726,549None
Dakota Wealth Management2025-09-302026-08-2731,311$2,628,056None
Dakota Wealth Management2025-12-312026-08-27180,797$19,037,633None
Dakota Wealth Management2026-03-312026-08-27233,345$28,076,377None
Redwood Investment Management, LLC2025-06-302026-08-2726,503$2,098,000None
Redwood Investment Management, LLC2025-09-302026-08-2720,225$1,697,000None
Redwood Investment Management, LLC2025-12-312026-08-2710,863$1,143,000None
BOSTON RESEARCH & MANAGEMENT INC2026-03-312026-08-2766,572$8,007,981None
Advus Financial Partners, LLC2026-06-302026-08-263,936$505,812None

90-day public filing window, up to 50 source positions.

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗B. Riley Wealth Advisors, Inc. ↗B. Riley Wealth Advisors, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗

Recent Congressional disclosures

Show the table · 2 rows, 5 columns

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Maria Elvira Salazar2026-10-072026-09-24sale$1,001 - $15,000
Ro Khanna2026-10-072026-09-04sale$1,001 - $15,000

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.