$MRK

$140.52 -$0.09 (0.06%) Live

$MRK Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 2.47B shares outstanding

Who owns MRK?

By type of holder

Institutions 80.0% Insiders 0.1% Everyone else 20.0%

Concentration Top 10 holders own 37.1%

BlackRock, Inc. 9.2% · Vanguard Capital Management LLC 6.5%

Institutional ownership

80.0%

+1.8 pts vs last qtr

Institutional holders

3,789

+27 vs last qtr

Net shares bought

+45.8M

by institutions in Q2 2026

New / sold out

213 / 186

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +37.0M
Capital International Investors +14.5M

Biggest sellers in Q2 2026

Jpmorgan Chase & Co −9.1M
Nordea Investment Management AB −5.0M

Who is planning to sell?

Notices of proposed sale, last 12 months

$72M

22 notices from 14 people

Shares covered

584.3K

0.02% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Jennifer Zachary Officer $14.5M
Jennifer L Zachary Officer $10.7M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−10.0%

−1.17% a year

Each share's claim on the business

+11.2%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$31.2B vs $5.04B

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years89% 3–5 years2% 1–3 years4% Under 1 year4%

Quarterly turnover

5.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting MRK on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	227.0M	9.20%	+1.2M (+0.5%)	≤2021	0.4%
Shares held by quarter Peak holding227.0M (Q2'26) Change over 8 quarters+14.9M Share of the company9.200% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	161.3M	6.54%	+335.6K (+0.2%)	≤2021	0.4%
Shares held by quarter Peak holding161.3M (Q2'26) Change over 8 quarters+161.3M Share of the company6.540% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

227.0M

% of company

9.20%

Change vs last qtr

+1.2M (+0.5%)

Held since

≤2021

Vanguard Capital Management LLC

161.3M

% of company

6.54%

Change vs last qtr

+335.6K (+0.2%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Merck & Co Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting MRK on Form N-PORT; together they hold 31.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$10.1B	78.4M	3.18%	0.44%	June 30, 2026
V5 Vanguard 500 Index Fund Vanguard Index Funds	$8.22B	64.0M	2.59%	0.49%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$10.1B

% of company

3.18%

% of the fund

0.44%

As of

June 30, 2026

Vanguard 500 Index Fund

Vanguard Index Funds

Position value

$8.22B

% of company

2.59%

% of the fund

0.49%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Merck & Co Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
CS Chattopadhyay Sanat Insider	470.1K	0.02%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.020% Chattopadhyay Sanat's insider activity →
DR Davis Robert M Insider	450.4K	0.02%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.020% Davis Robert M's insider activity →

Chattopadhyay Sanat

Insider

470.1K

% of company

0.02%

Change vs last qtr

—

Held since

—

Davis Robert M

Insider

450.4K

% of company

0.02%

Change vs last qtr

—

Held since

—

24 more holders behind a free account

See every insider and 5%+ holder of Merck & Co Inc.

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