MRKMerck & Co., Inc.

CSNew York Stock Exchange (XNYS)·USD

Identity

Security key: 18747
Ticker: MRK
Type: CS — Common Stock
Exchange: New York Stock Exchange(XNYS)
Venue group: NYSE
Operating MIC: XNYS
Market: stocks
Locale: us
Currency: USD
Listed: 1949-04-20
Round lot: 100
Active: Yes
Last seen in a load: 2026-08-14 20:49
Vendor updated: 2026-08-13 06:09
Ticker root / suffix: MRK

Detail

Enriched 2026-08-14 20:47

Market cap: $327,936,454,122.96
Shares outstanding (class): 2,469,824,415
Shares outstanding (weighted): 2,467,171,638
SIC: 2834 PHARMACEUTICAL PREPARATIONS
Employees: 75,000
Location: RAHWAY, NJ
Homepage: https://www.merck.com
Description: Merck makes pharmaceutical products to treat several conditions in a number of therapeutic areas, including cardiometabolic disease, cancer, and infections. In cancer, the firm's immuno-oncology platform, led by Keytruda, is a major contributor to overall sales. The company also has a substantial vaccine business aimed at preventing pediatric diseases, as well as Gardasil for human papillomavirus. Additionally, Merck sells animal health-related drugs. From a geographical perspective, 53% of the company's 2025 sales were generated from US human health (pharmaceuticals and vaccines).

Market cap and share counts drift.

Funds holding this security

723 funds · 767 positions · $53.71B reported value, as of 2026-03-31

All holders →

Fund	Ticker	Position value	% of fund	Balance	Match
VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS	VTI	$9.44B	0.47%	78,518,230 NS	FIGI
VANGUARD 500 INDEX FUND VANGUARD INDEX FUNDS	VOO	$7.59B	0.53%	63,072,878 NS	FIGI
iShares Core S&P 500 ETF iShares Trust	IVV	$3.84B	0.53%	31,921,451 NS	FIGI
N/A —	—	$3.48B	0.53%	28,906,718 NS	FIGI
VANGUARD VALUE INDEX FUND VANGUARD INDEX FUNDS	VTV	$2.75B	1.22%	22,868,467 NS	FIGI
State Street(R) Health Care Select Sector SPDR(… SELECT SECTOR SPDR TRUST	XLV	$2.17B	5.63%	18,061,996 NS	FIGI
VANGUARD INSTITUTIONAL INDEX FUND VANGUARD INSTITUTIONAL INDEX FUNDS	—	$1.68B	0.53%	13,994,665 NS	FIGI
VANGUARD EQUITY INCOME FUND VANGUARD FENWAY FUNDS	—	$1.58B	2.53%	13,145,851 NS	FIGI
JPMorgan Large Cap Growth Fund JPMorgan Trust II	—	$1.31B	1.22%	10,888,344 NS	FIGI
iShares Russell 1000 Value ETF iShares Trust	IWD	$686.53M	0.98%	5,707,253 NS	FIGI
Oakmark Fund HARRIS ASSOCIATES INVESTMENT TRUST	—	$657.63M	2.69%	5,467,000 NS	FIGI
JPMorgan Equity Income Fund JPMorgan Trust II	—	$646.78M	1.57%	5,376,855 NS	FIGI
State Street(R) SPDR(R) Portfolio S&P 500(R) ETF SPDR SERIES TRUST	SPYM	$627.65M	0.53%	5,217,781 NS	FIGI
VANGUARD WELLESLEY INCOME FUND VANGUARD WELLESLEY INCOME FUND	—	$557.60M	1.18%	4,635,428 NS	FIGI
iShares S&P 500 Value ETF iShares Trust	IVE	$515.15M	1.11%	4,282,579 NS	FIGI

How positions resolve to the securities master. FIGI_COMPOSITE is exact identifier equality — both sides got the FIGI from Bloomberg. TICKER is a narrow fallback used only where the master row carries no FIGI at all (2,389 rows do not, disproportionately Irish-domiciled US listings like LIN and ACN). Roughly 22% of all positions resolve to the master.

Funds holding this security

Identifiers

master.security_identifier

TICKERMRK
FIGI_COMPOSITEBBG000BPD168
FIGI_SHARE_CLASSBBG001S5TC52
CIK0000310158
ISINUS58933Y1055
Resolved through OpenFIGI from a holdings ISIN, not supplied by the securities vendor.

Identifiers

Classification

classification.v_security_classification

Asset class: Equity
Sector: Health Care
Industry: Pharmaceuticals
Source: LLMunreviewed
Self-reported confidence: 1
Model: deepseek
Rationale: Merck & Co. is a pharmaceutical company, classified under healthcare and pharmaceuticals.

Classifications are unreviewed model output. All 5,771 assignments carry source = LLM and is_reviewed = false. Confidence is the model’s own estimate and is not calibrated — it clustered at 0.90–0.98 across the whole first pass, including rows that later proved wrong. Use it to order a review queue, not as a probability. Two share classes of one issuer can disagree.

Classification

Fund data

Not linked to a fund series.

Either this is not a fund, or it is one the SEC share-class snapshot cannot reach — commodity trusts and notes have no series ID at all.