Company · Ownership research

Merck & Co., Inc. MRK

CIK 0000310158 · CUSIP 58933Y105

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 58933Y105 (MRK), not CUSIP 58933Y905 (MRK), CUSIP 58933Y955 (MRK), CUSIP 589331107 (MRK), and does not merge CUSIPs.

This page lists the top 20 of 3,668 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	VANGUARD GROUP INC CIK 102909 · View history	$26.77B 254,322,763 shares	0.39%	+2.19M(+0.90%)Added	SEC filing ↗ Jan 29, 2026	▾
02	BlackRock, Inc. CIK 2012383 · View history	$23.06B 219,095,465 shares	0.39%	+4.22M(+2.00%)Added	SEC filing ↗ Feb 12, 2026	▾
03	STATE STREET CORP CIK 93751 · View history	$12.74B 120,040,168 shares	0.43%	+1.86M(+1.60%)Added	SEC filing ↗ Feb 13, 2026	▾
04	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$9.10B 86,435,458 shares	1.59%	+11.16M(+14.80%)Added	SEC filing ↗ Feb 17, 2026	▾
05	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$6.31B 60,047,984 shares	0.39%	+249.11K(+0.40%)Added	SEC filing ↗ Feb 9, 2026	▾
06	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$5.11B 48,563,804 shares	0.79%	-5.14M(-9.60%)Reduced	SEC filing ↗ Feb 13, 2026	▾
07	MORGAN STANLEY CIK 895421 · Amended · View history	$4.73B 44,946,021 shares	0.28%	+359.49K(+0.80%)Added	SEC filing ↗ May 27, 2026	▾
08	FMR LLC CIK 315066 · View history	$4.30B 40,836,566 shares	0.22%	+7.41M(+22.20%)Added	SEC filing ↗ Feb 17, 2026	▾
09	NORGES BANK CIK 1374170 · View history	$4.00B 37,981,502 shares	0.43%	+37.98MNew	SEC filing ↗ Feb 10, 2026	▾
10	JPMORGAN CHASE & CO CIK 19617 · View history	$3.07B 29,199,978 shares	0.21%	-6.00M(-17.00%)Reduced	SEC filing ↗ Feb 11, 2026	▾
11	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$2.93B 27,854,441 shares	0.21%	+1.41M(+5.30%)Added	SEC filing ↗ Feb 17, 2026	▾
12	NORTHERN TRUST CORP CIK 73124 · View history	$2.87B 27,234,642 shares	0.37%	-698.50K(-2.50%)Reduced	SEC filing ↗ Feb 17, 2026	▾
13	Fisher Asset Management, LLC CIK 850529 · View history	$2.62B 24,873,327 shares	0.89%	+805.20K(+3.30%)Added	SEC filing ↗ Feb 9, 2026	▾
14	Invesco Ltd. CIK 914208 · Amended · View history	$2.16B 20,546,185 shares	0.20%	+701.25K(+3.50%)Added	SEC filing ↗ Feb 19, 2026	▾
15	Legal & General Group Plc CIK 764068 · View history	$2.08B 19,776,842 shares	0.46%	-882.32K(-4.30%)Reduced	SEC filing ↗ Feb 9, 2026	▾
16	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC CIK 861177 · View history	$2.05B 19,433,403 shares	0.43%	-316.46K(-1.60%)Reduced	SEC filing ↗ Feb 13, 2026	▾
17	GOLDMAN SACHS GROUP INC CIK 886982 · Amended · View history	$2.04B 19,348,718 shares	0.29%	+4.33M(+28.80%)Added	SEC filing ↗ Mar 25, 2026	▾
18	UBS Group AG CIK 1610520 · View history	$2.02B 19,178,272 shares	0.40%	+2.27M(+13.40%)Added	SEC filing ↗ Jan 29, 2026	▾
19	Bank of New York Mellon Corp CIK 1390777 · View history	$2.02B 19,164,526 shares	0.36%	-2.63M(-12.10%)Reduced	SEC filing ↗ Feb 10, 2026	▾
20	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$1.97B 18,753,390 shares	0.21%	+5.15M(+37.90%)Added	SEC filing ↗ Feb 17, 2026	▾

Showing 20 / 3,668 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

3,668

Cancelled or null records excluded

Disclosed shares

1,959,434,850

Not deduplicated across managers

Disclosed value

$206.51B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Merck & Co., Inc. · Q4 2025

Explore all 3,668 reporting institutions.

This page includes 20 of 3,668 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

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.