Merck & Co Ownership & Insider Activity

Merck & Co (MRK) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 0.2% of shares outstanding. Institutional investors hold 55.1%. Over the past 90 days, insiders made 5 sales worth $14.7M.

Shares Outstanding

2.467B

Shares Float

2.466B

Insider Shares Owned

4.137M

Insider % Owned

0.2%

Institutional Shares Held

1.360B

Institutional % Held

55.1%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$14.7M total

Net Activity

Net Selling

Net Value (90d)

-$14.7M

Merck & Co Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Aug 13, 2026	Chirfi Guindo	EVP, ACCESS, POLICY & COMMS	SELL	10.000K	$135.00	$1.4M
Aug 12, 2026	Jennifer Zachary	EVP, GENERAL COUNSEL	SELL	25.388K	$121.62	$4.7M
Aug 10, 2026	Richard R DeLuca	EVP&PRES, MERCK ANIMAL HEALLTH	SELL	45.320K	$131.12	$5.9M
Aug 6, 2026	Richard R DeLuca	EVP&PRES, MERCK ANIMAL HEALLTH	SELL	6.050K	$130.38	$789K
Aug 6, 2026	Chirfi Guindo	EVP, ACCESS, POLICY & COMMS	SELL	15.000K	$131.00	$2.0M
Aug 5, 2026	David R Maraldo	EVP & PRES. MMD	SELL-OPTIONS	—	$105.48	$869K
Aug 5, 2026	David Michael Williams	EVP,CHIEF INFO&DIGITAL OFFICER	SELL-OPTIONS	—	$101.63	$2.9M

Date	Member	Party	Chamber	Action	Amount
Mar 27, 2026	Alan Armstrong	R	Senate	S	$15,001 - $50,000
Feb 4, 2026	Josh Gottheimer	D	House	P	$1,001 - $15,000
Dec 19, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Dec 18, 2025	Julie Johnson	D	House	S	$1,001 - $15,000
Nov 18, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Nov 13, 2025	Julie Johnson	D	House	S (Partial)	$1,001 - $15,000
Sep 23, 2025	Val Hoyle	D	House	S	$1,001 - $15,000
Aug 28, 2025	Marjorie Taylor Greene	R	House	P	$1,001 - $15,000
Aug 14, 2025	Julie Johnson	D	House	S (Partial)	$1,001 - $15,000
Aug 5, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Aug 4, 2025	Lisa McClain	R	House	S	$1,001 - $15,000
Jul 11, 2025	Ritchie Torres	D	House	S	$1,001 - $15,000
Jun 24, 2025	Lisa McClain	R	House	P	$1,001 - $15,000
Jun 16, 2025	Scott Franklin	R	House	S	$1,001 - $15,000
Jun 13, 2025	Julie Johnson	D	House	P	$1,001 - $15,000
May 30, 2025	Gilbert Ray Cisneros	D	House	S	$1,001 - $15,000
May 15, 2025	Robert Bresnahan	R	House	S	$15,001 - $50,000
May 5, 2025	Marjorie Taylor Greene	R	House	P	$1,001 - $15,000
Apr 29, 2025	Gilbert Ray Cisneros	D	House	P	$1,001 - $15,000
Apr 21, 2025	Bruce Westerman	R	House	S	$1,001 - $15,000