ACADIAN ASSET MANAGEMENT LLC

Position in MRK — Merck & Co., Inc.

CIK 916542 Boston, MA

Back to MRK Full portfolio

Position in MRK

as of Mar 31, 2026 · filed May 13, 2026 Compact

Position Value

$505,504,410

+$337,649,552 QoQ

Shares Held

4,202,381

+163.5% QoQ

Ownership

0.170%

of shares outstanding

% of Portfolio

0.75%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in MRK Over Time

Shares Held

Position Value (USD)

Position in Drug Manufacturers - General

Healthcare · as of Mar 31, 2026

ACADIAN ASSET MANAGEMENT LLC holds $4,100,855,961 across 15 Drug Manufacturers - General names. MRK ranks #3 (12.3% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	BMY	Bristol Myers Squibb Co	11,887,668	$720,987,064
2	GSK	GSK plc	11,797,085	$651,081,121
3	MRK	Merck & Co., Inc. This page	4,202,381	$505,504,410
4	LLY	ELI LILLY & Co	534,020	$491,175,575
5	JNJ	Johnson & Johnson	1,905,647	$465,816,352
6	AZN	Astrazeneca PLC	2,330,171	$459,556,324
7	ABBV	AbbVie Inc.	2,095,605	$455,773,131
8	PFE	Pfizer Inc	8,401,716	$235,920,185

All Filings in MRK

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25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$505,504,410	4,202,381	+163.5%	Shares	Defined	2026-05-13
2025-12-31	$167,854,858	1,594,669	-27.6%	Shares	Defined	2026-02-10
2025-09-30	$184,894,852	2,202,965	-47.3%	Shares	Defined	2025-11-13
2025-06-30	$330,760,956	4,178,385	+61.0%	Shares	Defined	2025-08-07
2025-03-31	$232,899,643	2,594,693	+357.8%	Shares	Defined	2025-05-21
2024-12-31	$56,378,897	566,736	-19.7%	Shares	Defined	2025-02-11
2024-09-30	$80,172,565	705,993	+28.5%	Shares	Defined	2024-11-12
2024-06-30	$68,024,138	549,468	+233.3%	Shares	Defined	2024-08-06
2024-03-31	$21,753,672	164,863	+105.4%	Shares	Defined	2024-05-10
2023-12-31	$8,750,599	80,266	-77.2%	Shares	Defined	2024-02-13
2023-09-30	$36,306,964	352,666	-61.6%	Shares	Defined	2023-11-13
2023-06-30	$105,866,747	917,469	-13.9%	Shares	Defined	2023-08-07
2023-03-31	$113,370,247	1,065,610	-9.6%	Shares	Defined	2023-05-11
2022-12-31	$130,834,015	1,179,216	+89.5%	Shares	Defined	2023-02-14
2022-09-30	$53,591,528	622,289	-12.5%	Shares	Defined	2022-11-14
2022-06-30	$64,851,409	711,324	-31.9%	Shares	Defined	2022-08-09
2022-03-31	$85,700,404	1,044,490	-47.9%	Shares	Defined	2022-05-12
2021-12-31	$153,667,645	2,005,058	+3.3%	Shares	Defined	2022-02-10
2021-09-30	$145,843,490	1,941,732	+46.9%	Shares	Defined	2021-11-12
2021-06-30	$102,779,898	1,321,588	-45.1%	Shares	Defined	2021-08-11
2021-03-31	$176,925,323	2,405,210	+39.8%	Shares	Defined	2021-05-11
2020-12-31	$134,325,842	1,720,948	+28.5%	Shares	Defined	2021-02-11
2020-09-30	$105,963,687	1,338,757	-19.2%	Shares	Defined	2020-11-09
2020-06-30	$122,272,655	1,657,076	+107.1%	Shares	Defined	2020-08-12
2020-03-31	$58,728,615	799,943	—	Shares	Defined	2020-05-11
No filing history on record for this holder in this stock.