What is CUSIP 58933Y105?

CUSIP 58933Y105 is the security identifier used in SEC filing datasets for MRK - Merck & Co., Inc. - Common Stock.

Who owns MRK - Merck & Co., Inc. - Common Stock based on 13F filings?

3851 institutions reported positions in MRK - Merck & Co., Inc. - Common Stock as of Q2 2026. Open the latest holders period and ownership history tables on this page for position-level details.

Security Snapshot

Merck & Co., Inc. - Common Stock (MRK) Institutional Ownership

CUSIP: 58933Y105

13F Institutional Holders and Ownership History from Q1 2014 to Q3 2026

13F reference period

Q2 2026

Institutions Reporting

3,851

Shares (Excl. Options)

1.98B

Full value: 1,979,028,739 · shares · 30 Jun 2026

Price

$128.50

The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.

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Security type / class: Equity / Common Stock
Symbol: MRK on NYSE
All holders as of 30 Jun 2026: Q2 2026
Total 13F shares: 1,979,028,739
Total 13F value: $254,161,090,434
Portfolio coverage rank: 0.16%
Share change: +48,500,164
Value change: +$6,240,924,755
Number of holders: 3,851
Shares outstanding: 2,474,419,203
SEC-reported price per share: $145.31
Insider filing price: $145.31

13F Shares, Excluding Options vs Price

13F Value, Excluding Options

Total Investors

Filing notes and source

Key facts

MRK - Merck & Co., Inc. - Common Stock is tracked under CUSIP 58933Y105.
3851 institutions reported positions in Q2 2026.
1 significant owner is listed from Schedule 13D/13G reporting.

Change

Holder count moved from 3,801 to 3,851 between Q1 2026 and Q2 2026.
SEC-reported value moved from
$231.78B
Full value: $231,778,821,442 · USD · 31 Mar 2026
to
$254.16B
Full value: $254,161,090,434 · USD · 30 Jun 2026
.

Research use

You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Evidence

Source: SEC Form 13F

Latest holder context comes from 3851 institutions filings for Q2 2026.

Open SEC evidence

Security key

58933Y105

13F reference period

Q2 2026

13F holders

3,851

13D/G owners

CIK / CUSIP context first

Open Q2 2026 holders MRK full holder history Merck & Co., Inc. SEC filings Merck & Co., Inc. company facts Merck & Co., Inc. insider transactions Merck & Co., Inc. 13D/G history

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

Recent Quarterly Holder Reports

Open recent reporting periods for CUSIP 58933Y105:

Q3 2026 (1588 holders) Q2 2026 (3851 holders) Q1 2026 (3801 holders) Q4 2025 (3636 holders) Q3 2025 (3277 holders) Q2 2025 (3289 holders) Q1 2025 (3404 holders) Q4 2024 (3564 holders) Q3 2024 (3451 holders) Q2 2024 (3508 holders)

13D/G owners

Significant owners

Large-stake holder rows connected to Schedule 13D/G evidence.

Rows

Security

MRK

Filer	Ownership	Change %	Holdings Value	Net Change	Nb Shares	Change %	Reporting Name	Report Period
VANGUARD CAPITAL MANAGEMENT LLC	7.5%		$22,412,885,812		186,323,766		Vanguard Capital Management	31 Mar 2026

As of 30 Jun 2026, 3,851 institutional investors reported holding

1.98B

Full value: 1,979,028,739 · shares · 30 Jun 2026

shares of Merck & Co., Inc. - Common Stock (MRK). This represents 80% of the company’s total

2.47B

Full value: 2,474,419,203 · shares · Stored outstanding share count

outstanding shares.

13F concentration

Top 25 institutional shareholders

Largest 13F positions for this security by reported shares and value.

Top holder share

50%

Institution	Ownership %	Shares Held	Share Change %	Portfolio %	Holdings Value
BlackRock, Inc.	9.2%	226,999,837	+0.52%	0.43%	$29,169,479,139
VANGUARD CAPITAL MANAGEMENT LLC	6.5%	161,323,174	+0.21%	0.44%	$20,730,027,859
STATE STREET CORP	4.9%	120,413,256	+0.91%	0.46%	$15,573,753,504
WELLINGTON MANAGEMENT GROUP LLP	3.5%	86,249,283	+2.3%	1.9%	$11,083,032,867
VANGUARD PORTFOLIO MANAGEMENT LLC	2.7%	67,738,969	+0.65%	0.39%	$8,704,457,517
GEODE CAPITAL MANAGEMENT, LLC	2.5%	60,744,214	+2%	0.42%	$7,794,706,241
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	2.2%	54,365,289	+9.2%	0.93%	$6,985,940,692
MORGAN STANLEY	2%	48,641,158	+2.1%	0.33%	$6,250,389,318
FMR LLC	1.8%	45,440,355	+2.1%	0.25%	$5,839,085,718
JPMORGAN CHASE & CO	1.8%	43,886,420	-17%	0.33%	$5,678,025,348
Fisher Asset Management, LLC	1.6%	38,516,263	+46%	1.5%	$4,949,339,962
NORGES BANK	1.5%	36,983,784		0.47%	$4,752,416,244
BANK OF AMERICA CORP /DE/	1.2%	30,535,208	-0.78%	0.25%	$3,923,774,320
NORTHERN TRUST CORP	1.1%	26,275,718	-3%	0.39%	$3,376,429,765
GOLDMAN SACHS GROUP INC	0.89%	22,075,139	+9.6%	0.3%	$2,836,655,396
FRANKLIN RESOURCES INC	0.79%	19,548,585	+20%	0.54%	$2,511,993,155
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0.79%	19,547,171	-4.3%	0.46%	$2,511,811,477
Legal & General Group Plc	0.76%	18,873,343	-3.4%	0.51%	$2,425,224,589
Invesco Ltd.	0.75%	18,611,171	-15%	0.19%	$2,391,535,516
PRICE T ROWE ASSOCIATES INC /MD/	0.75%	18,518,796	-20%	0.24%	$2,379,667,000
Bank of New York Mellon Corp	0.74%	18,340,173	-2%	0.39%	$2,356,712,169
DIMENSIONAL FUND ADVISORS LP	0.71%	17,486,486	+13%	0.41%	$2,246,948,350
AMERIPRISE FINANCIAL INC	0.7%	17,387,435	+6.9%	0.45%	$2,235,322,286
Capital International Investors	0.62%	15,386,689	+1668%	0.41%	$1,977,446,105
ROYAL BANK OF CANADA	0.58%	14,293,086	+8.3%	0.31%	$1,836,658,000

Quarter history

Institutional holders across reporting periods

Holder count, reported shares/value, and median price by quarter.

Periods

Headline period

Q2 2026

Rows shown

1-25 of 51

Period	13F Shares, Excl. Options	Value, Excl. Options	Value Change	Puts Notional Value	Calls Notional Value	Price (Median)	Investors
2026 Q3	90,505,719	$13,105,214,921	-$507,035,545	$188,903	$4,708,044	$145.31	1,588
2026 Q2	1,979,028,739	$254,161,090,434	+$6,240,924,755	$2,851,571,176	$2,643,147,078	$128.50	3,851
2026 Q1	1,929,150,478	$231,778,821,442	-$2,951,544,650	$2,397,874,678	$2,932,060,058	$120.29	3,801
2025 Q4	1,958,696,201	$206,420,622,250	+$5,694,909,605	$2,291,302,307	$3,268,522,561	$105.26	3,636
2025 Q3	1,901,091,184	$159,522,013,920	-$5,198,827,945	$2,263,856,886	$2,557,420,508	$83.93	3,277
2025 Q2	1,962,034,663	$155,426,643,563	+$1,505,473,737	$2,248,174,054	$2,268,475,702	$79.16	3,289
2025 Q1	1,941,447,306	$174,232,015,862	-$3,587,246,902	$1,977,836,173	$2,285,453,895	$89.76	3,404
2024 Q4	1,974,065,350	$196,447,436,509	+$1,380,482,223	$1,343,540,804	$1,527,192,670	$99.48	3,564
2024 Q3	1,947,661,118	$221,070,370,247	-$744,228,437	$1,568,058,626	$1,730,017,179	$113.56	3,451
2024 Q2	1,949,415,662	$241,598,779,368	+$1,501,198,298	$1,314,981,755	$1,644,671,786	$123.80	3,508
2024 Q1	1,941,852,214	$256,040,362,493	+$1,890,608,443	$1,940,155,259	$2,283,907,636	$131.95	3,501
2023 Q4	1,933,150,988	$210,948,238,812	+$1,318,800,501	$1,441,919,381	$1,616,553,741	$109.02	3,400
2023 Q3	1,915,111,810	$197,316,747,504	-$1,438,036,059	$1,134,389,687	$1,442,411,025	$102.95	3,187
2023 Q2	1,928,213,181	$222,354,738,610	+$571,381,359	$1,456,269,607	$1,635,382,517	$115.39	3,228
2023 Q1	1,916,184,102	$203,955,773,239	+$1,393,536,493	$1,179,847,237	$1,406,289,293	$106.39	3,143
2022 Q4	1,910,613,534	$212,044,007,861	+$3,048,706,791	$1,821,960,470	$1,960,830,741	$110.95	3,194
2022 Q3	1,884,427,186	$162,534,818,377	+$724,062,490	$1,375,257,440	$1,824,499,732	$86.12	2,957
2022 Q2	1,873,403,998	$170,943,528,865	+$4,592,156,668	$1,476,971,931	$1,925,795,988	$91.17	2,980
2022 Q1	1,838,887,453	$150,955,940,625	+$142,448,476	$1,277,439,360	$1,921,428,730	$82.05	2,924
2021 Q4	1,837,012,964	$140,853,569,294	+$138,185,632	$1,769,079,544	$2,602,310,368	$76.64	2,872
2021 Q3	1,837,457,296	$138,201,713,292	-$807,929,658	$1,492,108,491	$2,472,857,945	$75.11	2,619
2021 Q2	1,848,198,293	$143,695,016,489	-$241,935,815	$1,114,152,540	$1,351,595,585	$77.77	2,641
2021 Q1	1,850,105,541	$142,628,769,907	-$1,117,656,172	$1,113,971,180	$1,255,751,824	$77.09	2,654
2020 Q4	1,866,883,590	$152,693,500,286	-$706,920,307	$1,127,667,100	$1,438,837,360	$81.80	2,670
2020 Q3	1,875,444,213	$155,469,945,637	-$969,657,574	$1,189,298,255	$1,567,196,760	$82.95	2,532