Calamos Advisors LLC

SEC CIK: 0001316507
Latest filing: Jul 31, 2026

SEC filings (opens in a new tab)

MRK holding history

Merck & Co., Inc. in every 13F filed by Calamos Advisors LLC, 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): 650,503
Value: $83.6M
% of portfolio: 0.3%
Quarters held: 22; Since Q1 2021

Holdings of MRK by Calamos Advisors LLC, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	650,503	$83.6M	0.3%	−127,160−16.4%	Reduced	Holders
Q1 2026	777,663	$93.5M	0.4%	+57,857+8.0%	Added	Holders
Q4 2025	719,806	$75.8M	0.3%	+209,606+41.1%	Added	Holders
Q3 2025	510,200	$42.8M	0.2%	−130.0%	Reduced	Holders
Q2 2025	510,213	$40.4M	0.2%	−158,002−23.6%	Reduced	Holders
Q1 2025	668,215	$60.0M	0.3%	−184,632−21.6%	Reduced	Holders
Q4 2024	852,847	$84.8M	0.4%	−100,857−10.6%	Reduced	Holders
Q3 2024	953,704	$108.3M	0.5%	+19,291+2.1%	Added	Holders
Q2 2024	934,413	$115.7M	0.6%	−63,036−6.3%	Reduced	Holders
Q1 2024	997,449	$131.6M	0.6%	+56,176+6.0%	Added	Holders
Q4 2023	941,273	$102.6M	0.5%	−29,334−3.0%	Reduced	Holders
Q3 2023	970,607	$99.9M	0.5%	+188,466+24.1%	Added	Holders
Q2 2023	782,141	$90.3M	0.5%	+68,896+9.7%	Added	Holders
Q1 2023	713,245	$75.9M	0.4%	−60,622−7.8%	Reduced	Holders
Q4 2022	773,867	$85.9M	0.4%	−37,721−4.6%	Reduced	Holders
Q3 2022	811,588	$69.9M	0.3%	+162,388+25.0%	Added	Holders
Q2 2022	649,200	$59.2M	0.3%	+17,920+2.8%	Added	Holders
Q1 2022	631,280	$51.8M	0.2%	−167,898−21.0%	Reduced	Holders
Q4 2021	799,178	$61.2M	0.2%	−10,590−1.3%	Reduced	Holders
Q3 2021	809,768	$60.8M	0.3%	+50,329+6.6%	Added	Holders
Q2 2021	759,439	$59.1M	0.3%	+115,257+17.9%	Added	Holders
Q1 2021	644,182	$49.7M	0.3%	–	–	Holders

Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.