Does Calamos Advisors own MRK stock?

Yes. As of its Q2 2026 13F, Calamos Advisors holds 650,503 shares of MRK (Merck), worth $83.6M.

How many shares of MRK does Calamos Advisors own?

As of its Q2 2026 13F, Calamos Advisors holds 650,503 shares of MRK (Merck).

As of its Q2 2026 13F, Calamos Advisors' MRK position is worth $83.6M.

In Q2 2026, Calamos Advisors reduced its MRK position by 127,160 shares (-16.4%).

Calamos Advisors already held MRK in its Q1 2019 13F, the earliest on record, and has listed it in 30 quarterly 13F filings.

Position history for Calamos Advisors LLC's holdings in Merck & Co., Inc.

Current Value

$83.6M

Current Shares

650,503

Total Value Change

-$971,364

Total Shares Change

-366,216

Quarter-by-Quarter History

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Decreased	650,503	-16.4%	$83.6M	0.3%	$127.75	0
2026-Q1	Increased	777,663	+8.0%	$93.5M	0.3%	$118.73	39
2025-Q4	Increased	719,806	+41.1%	$75.8M	0.3%	$103.13	47
2025-Q3	Decreased	510,200	0.0%	$42.8M	0.2%	$81.54	0
2025-Q2	Decreased	510,213	-23.6%	$40.4M	0.2%	$76.15	0
2025-Q1	Decreased	668,215	-21.6%	$60M	0.3%	$85.49	0
2024-Q4	Decreased	852,847	-10.6%	$84.8M	0.4%	$93.94	0
2024-Q3	Increased	953,704	+2.1%	$108.3M	0.5%	$106.38	37
2024-Q2	Decreased	934,413	-6.3%	$115.7M	0.5%	$115.20	0
2024-Q1	Increased	997,449	+6.0%	$131.6M	0.6%	$122.06	45
2023-Q4	Decreased	941,273	-3.0%	$102.6M	0.5%	$100.21	0
2023-Q3	Increased	970,607	+24.1%	$99.9M	0.5%	$93.95	51
2023-Q2	Increased	782,141	+9.7%	$90.3M	0.4%	$104.59	39
2023-Q1	Decreased	713,245	-7.8%	$75.9M	0.4%	$95.79	0
2022-Q4	Decreased	773,867	-4.7%	$85.9M	0.4%	$99.21	0
2022-Q3	Increased	811,588	+25.0%	$69.9M	0.3%	$76.50	43
2022-Q2	Increased	649,200	+2.8%	$59.2M	0.3%	$80.34	36
2022-Q1	Decreased	631,280	-21.0%	$51.8M	0.2%	$71.71	0
2021-Q4	Decreased	799,178	-1.3%	$61.2M	0.2%	$66.39	0
2021-Q3	Increased	809,768	+6.6%	$60.8M	0.3%	$64.46	38
2021-Q2	Increased	759,439	+17.9%	$59.1M	0.3%	$66.15	41
2021-Q1	Increased	644,182	+1.9%	$49.7M	0.3%	$62.03	36
2020-Q4	Decreased	632,134	-2.6%	$51.7M	0.3%	$65.25	0
2020-Q3	Decreased	649,148	-5.3%	$53.8M	0.3%	$65.65	0
2020-Q2	Decreased	685,429	-12.2%	$53M	0.4%	$60.76	0
2020-Q1	Decreased	780,747	-32.9%	$60.1M	0.5%	$59.98	0
2019-Q4	Decreased	1.2M	-0.7%	$105.9M	0.5%	$70.32	0
2019-Q3	Increased	1.2M	+3.8%	$98.7M	0.5%	$64.64	44
2019-Q2	Increased	1.1M	+11.1%	$94.7M	0.5%	$63.96	47
2019-Q1	First report	1M	-	$84.6M	0.5%	$63.02	0