Marshall Wace, LLP

SEC CIK: 0001318757
Latest filing: Aug 13, 2026

SEC filings (opens in a new tab)

MRK holding history

Merck & Co., Inc. in every 13F filed by Marshall Wace, LLP, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

MRK overview All 13F holders of MRK Full Q2 2026 holdings

Shares (Q2 2026): 0; Sold out in Q2 2026
Value: $0
% of portfolio: 0.0%
Quarters held: 18; Since Q3 2021

Holdings of MRK by Marshall Wace, LLP, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	0	$0	0.0%	−2,778,301−100.0%	Sold out	Holders
Q1 2026	2,778,301	$334.2M	0.4%	−1,191,168−30.0%	Reduced	Holders
Q4 2025	3,969,469	$417.8M	0.4%	+3,085,569+349.1%	Added	Holders
Q3 2025	883,900	$74.2M	0.1%	−2,260,600−71.9%	Reduced	Holders
Q2 2025	3,144,500	$248.9M	0.3%	+3,136,893+41,236.9%	Added	Holders
Q1 2025	7,607	$682.8K	<0.1%	+7,276+2,198.2%	Added	Holders
Q4 2024	331	$32.9K	<0.1%	−3,029−90.1%	Reduced	Holders
Q3 2024	3,360	$381.6K	<0.1%	−2,580,823−99.9%	Reduced	Holders
Q2 2024	2,584,183	$319.9M	0.5%	+634,194+32.5%	Added	Holders
Q1 2024	1,949,989	$257.3M	0.4%	−2,039,971−51.1%	Reduced	Holders
Q4 2023	3,989,960	$435.0M	0.8%	+1,938,555+94.5%	Added	Holders
Q3 2023	2,051,405	$211.2M	0.5%	+1,875,318+1,065.0%	Added	Holders
Q2 2023	176,087	$20.3M	<0.1%	+176,087	New	Holders
Q1 2023	0	$0	0.0%	−1,033,806−100.0%	Sold out	Holders
Q4 2022	1,033,806	$114.7M	0.3%	+372,519+56.3%	Added	Holders
Q3 2022	661,287	$57.0M	0.1%	−5,140,458−88.6%	Reduced	Holders
Q2 2022	5,801,745	$528.9M	1.2%	−983,823−14.5%	Reduced	Holders
Q1 2022	6,785,568	$556.8M	1.2%	+6,746,481+17,260.2%	Added	Holders
Q4 2021	39,087	$3.00M	<0.1%	+36,573+1,454.8%	Added	Holders
Q3 2021	2,514	$189.0K	<0.1%	+2,514	New	Holders