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?

3754 institutions reported positions in MRK - Merck & Co., Inc. - Common Stock as of Q1 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 Q1 2026

Latest Period

Q1 2026

Institutions Reporting

3,754

Shares (Excl. Options)

1,926,040,022

Price

$120.29

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Security type / class: Equity / Common Stock
Symbol: MRK on NYSE
All holders as of 31 Mar 2026: Q1 2026
Total 13F shares: 1,926,040,022
Total 13F value: $231,405,079,058
Portfolio coverage rank: 0.17%
Share change: -28,969,975
Value change: -$2,881,094,571
Number of holders: 3,754
Shares outstanding: 2,474,419,203
SEC-reported price per share: $119.89
Insider filing price: $119.89

13F Shares, Excluding Options vs Price

13F Value, Excluding Options

Total Investors

Key facts

MRK - Merck & Co., Inc. - Common Stock is tracked under CUSIP 58933Y105.
3754 institutions reported positions in Q1 2026.
1 significant owner is listed from Schedule 13D/13G reporting.

Change

Holder count moved from 3,634 to 3,754 between Q4 2025 and Q1 2026.
SEC-reported value moved from $206,419,507,963 to $231,405,079,058.

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 3754 institutions filings for Q1 2026.

Open SEC evidence

Security key

58933Y105

Latest holder period

Q1 2026

13F holders

3,754

13D/G owners

CIK / CUSIP context first

Open Q1 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:

Q1 2026 (3754 holders) Q4 2025 (3634 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) Q1 2024 (3501 holders) Q4 2023 (3400 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 31 Mar 2026, 3,754 institutional investors reported holding 1,926,040,022 shares of Merck & Co., Inc. - Common Stock (MRK). This represents 78% of the company’s total 2,474,419,203 outstanding shares.

13F concentration

Top 25 institutional shareholders

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

Top holder share

49%

Institution	Ownership %	Shares Held	Share Change %	Portfolio %	Holdings Value
BlackRock, Inc.	9.1%	225,830,330	+3.1%	0.48%	$27,165,130,301
VANGUARD CAPITAL MANAGEMENT LLC	6.5%	160,987,624	0%	0.48%	$19,365,201,291
STATE STREET CORP	4.8%	119,325,673	-0.6%	0.5%	$14,453,274,004
WELLINGTON MANAGEMENT GROUP LLP	3.4%	84,314,971	-2.5%	1.9%	$10,142,247,862
VANGUARD PORTFOLIO MANAGEMENT LLC	2.7%	67,304,305	0%	0.42%	$8,096,034,848
GEODE CAPITAL MANAGEMENT, LLC	2.4%	59,558,154	-0.82%	0.44%	$7,140,235,212
JPMORGAN CHASE & CO	2.1%	52,972,983	+81%	0.42%	$6,256,109,598
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	2%	49,765,225	+2.5%	0.91%	$5,986,904,095
MORGAN STANLEY	1.9%	47,632,487	+6%	0.35%	$5,729,712,158
FMR LLC	1.8%	44,516,010	+9%	0.28%	$5,354,830,881
BANK OF AMERICA CORP /DE/	1.2%	30,774,221	+10%	0.27%	$3,701,831,129
NORTHERN TRUST CORP	1.1%	27,090,023	-0.53%	0.43%	$3,258,658,868
Fisher Asset Management, LLC	1.1%	26,436,284	+6.3%	1.1%	$3,180,020,742
PRICE T ROWE ASSOCIATES INC /MD/	0.93%	23,042,842	+23%	0.32%	$2,771,825,000
Invesco Ltd.	0.88%	21,855,101	+6.4%	0.4%	$2,628,950,044
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0.83%	20,414,819	+5.1%	0.51%	$2,455,698,578
GOLDMAN SACHS GROUP INC	0.81%	20,133,379	+4.1%	0.32%	$2,421,844,110
Legal & General Group Plc	0.79%	19,538,545	-1.2%	0.54%	$2,350,291,572
Bank of New York Mellon Corp	0.76%	18,713,363	-2.4%	0.41%	$2,251,030,420
FRANKLIN RESOURCES INC	0.66%	16,267,205	+1.3%	0.48%	$1,956,782,124
AMERIPRISE FINANCIAL INC	0.66%	16,262,708	+1.8%	0.45%	$1,959,703,194
DIMENSIONAL FUND ADVISORS LP	0.62%	15,456,039	+24%	0.39%	$1,858,937,753
VANGUARD FIDUCIARY TRUST CO	0.56%	13,964,179	0%	0.42%	$1,679,751,092
UBS Group AG	0.56%	13,933,630	-27%	0.3%	$1,676,076,367
STATE FARM MUTUAL AUTOMOBILE INSURANCE CO	0.56%	13,794,969	0%	1.3%	$1,659,396,821

Quarter history

Institutional holders across reporting periods

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

Periods

Latest

Q1 2026

Rows shown

1-25 of 49

Period	13F Shares, Excl. Options	Value, Excl. Options	Value Change	Puts Notional Value	Calls Notional Value	Price (Median)	Investors
2026 Q1	1,926,040,022	$231,405,079,058	-$2,881,094,571	$2,397,874,678	$2,932,060,058	$120.29	3,754
2025 Q4	1,958,685,615	$206,419,507,963	+$5,694,909,605	$2,291,302,307	$3,268,522,561	$105.26	3,634
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
2020 Q2	1,884,914,191	$145,782,442,284	-$606,647,857	$878,498,000	$1,110,650,000	$77.33	2,468
2020 Q1	1,894,692,919	$145,892,266,360	-$1,876,783,315	$1,122,937,000	$1,132,116,000	$76.94	2,447