What does CUSIP 58933Y105 represent in this 13F holders report?

CUSIP 58933Y105 is the security identifier for MRK - Merck & Co., Inc. - Common Stock used to aggregate holder disclosures.

How many institutions held MRK - Merck & Co., Inc. - Common Stock in Q1 2026?

3786 institutional investors reported MRK - Merck & Co., Inc. - Common Stock for Q1 2026. Use the holders table for investor-level position and value details.

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

CUSIP: 58933Y105

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / Common Stock
Total 13F shares: 1,928,108,680
Total 13F value: $231,653,498,995
Share change: -28,363,387
Put/Call ratio: 82%
SEC-reported price per share: $120.29
Number of holders: 3,786
Value change: -$2,873,550,341
Number of buys: 1,711
Number of sells: 1,709
Shares outstanding: 2,474,419,203

Security key

58933Y105

Report period

Q1 2026

Institutions

3,786

Top holders

MRK full security history Ownership snapshot Full 13F holder table Merck & Co., Inc. SEC filings Merck & Co., Inc. company facts Merck & Co., Inc. 13D/G history

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Ownership snapshot

Top reported holders of MRK - Merck & Co., Inc. - Common Stock (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

VANGUARD CAPITAL MANAGEME...

Disclosed value leader

VANGUARD GROUP INC

Comparable rows

15/15

Latest evidence

31 Mar 2026

13D/G 13F Lead comparable stake: 7.5% 13D/G row: VANGUARD CAPITAL MANAGEMENT LLC Showing 1-6 of 15 holder rows.

Quick read

VANGUARD CAPITAL MANAGEMENT LLC leads the comparable SEC ownership view at 7.5%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens VANGUARD CAPITAL MANAGEMENT LLC's linked filing trail.

Comparable ownership Top 5

VANGUARD CAPITAL MANAGEMENT LLC 7.5%

VANGUARD GROUP INC 10%

BlackRock, Inc. 8.9%

STATE STREET CORP 4.9%

WELLINGTON MANAGEMENT GROUP LLP 3.5%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
VANGUARD CAPITAL MANAGEMENT LLC	13D/G Vanguard Capital Management 13D/G	7.5%	$22,412,885,812 186,323,766 shares	$0	31 Mar 2026
VANGUARD GROUP INC	13F Company 13F	10%	$26,770,014,033 254,322,763 shares	—	31 Dec 2025
BlackRock, Inc.	13F Company 13F	8.9%	$23,061,988,586 219,095,465 shares	—	31 Dec 2025
STATE STREET CORP	13F Company 13F	4.9%	$12,737,503,943 120,040,168 shares	—	31 Dec 2025
WELLINGTON MANAGEMENT GROUP LLP	13F Company 13F	3.5%	$9,098,196,310 86,435,458 shares	—	31 Dec 2025
GEODE CAPITAL MANAGEMENT, LLC	13F Company 13F	2.4%	$6,307,571,859 60,047,984 shares	—	31 Dec 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

3,786

1,928,108,680

Rows available

3,786

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2026 vs Q1 2026 Across Filers

Q1 2026 holders

3,786

Q1 2026 holders

3,786

Holder diff

Investor	Q1 2026 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q1 2026 value	Q1 2026 value	Value change	Value Chg %