Position in MRK
as of Jun 30, 2026
· filed Jul 31, 2026
Position Value
$83,589,635
-$9,955,447 QoQ
Shares Held
650,503
-16.4% QoQ
Ownership
0.026%
of shares outstanding
% of Portfolio
0.48%
of 13F equity value
Holder Rank
#230
of 3,769 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in MRK Over Time
Shares Held
Position Value (USD)
Derivatives in MRK
reported options exposure · as of Mar 31, 2026CallValue
$6,495,660
CallShares
54,000
PutValue
$0
PutShares
0
Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.
Position in Drug Manufacturers - General
Healthcare · as of Jun 30, 2026Calamos Advisors LLC holds $812,352,405 across 9 Drug Manufacturers - General names. MRK ranks #4 (10.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | LLY |
ELI LILLY & Co
|
283,001 | $339,439,917 | |
| 2 | JNJ |
Johnson & Johnson
|
647,222 | $164,374,971 | |
| 3 | ABBV |
AbbVie Inc.
|
399,893 | $100,629,074 | |
| 4 | MRK |
Merck & Co., Inc.
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|
650,503 | $83,589,635 | |
| 5 | GILD |
Gilead Sciences, Inc.
|
356,488 | $45,038,693 | |
| 6 | PFE |
Pfizer Inc
|
1,753,548 | $42,225,435 | |
| 7 | AMGN |
Amgen Inc
|
68,480 | $24,797,977 | |
| 8 | BIIB |
Biogen Inc.
|
34,879 | $7,535,956 |
All Filings in MRK
Export CSV
31 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $83,589,635 | 650,503 | Shares | Sole | 2026-07-31 | |
| 2026-03-31 | $6,495,660 | 54,000 | Call | Sole | 2026-05-04 | |
| 2026-03-31 | $93,545,082 | 777,663 | Shares | Sole | 2026-05-04 | |
| 2025-12-31 | $75,766,779 | 719,806 | Shares | Sole | 2026-01-29 | |
| 2025-12-31 | $6,315,600 | 60,000 | Call | Sole | 2026-01-29 | |
| 2025-09-30 | $42,821,086 | 510,200 | Shares | Sole | 2025-10-20 | |
| 2025-06-30 | $3,245,560 | 41,000 | Call | Sole | 2025-08-08 | |
| 2025-06-30 | $40,388,461 | 510,213 | Shares | Sole | 2025-08-08 | |
| 2025-03-31 | $59,978,978 | 668,215 | Shares | Sole | 2025-04-29 | |
| 2024-12-31 | $84,841,219 | 852,847 | Shares | Sole | 2025-01-24 | |
| 2024-09-30 | $108,302,626 | 953,704 | Shares | Sole | 2024-11-07 | |
| 2024-06-30 | $115,680,329 | 934,413 | Shares | Sole | 2024-07-25 | |
| 2024-03-31 | $9,236,500 | 70,000 | Put | Sole | 2024-05-08 | |
| 2024-03-31 | $131,613,395 | 997,449 | Shares | Sole | 2024-05-08 | |
| 2023-12-31 | $102,617,582 | 941,273 | Shares | Sole | 2024-01-31 | |
| 2023-09-30 | $3,139,975 | 30,500 | Call | Sole | 2023-10-26 | |
| 2023-09-30 | $99,923,990 | 970,607 | Shares | Sole | 2023-10-26 | |
| 2023-06-30 | $90,251,249 | 782,141 | Shares | Sole | 2023-07-28 | |
| 2023-03-31 | $75,882,135 | 713,245 | Shares | Sole | 2023-05-04 | |
| 2022-12-31 | $85,860,543 | 773,867 | Shares | Sole | 2023-01-26 | |
| 2022-09-30 | $69,893,958 | 811,588 | Shares | Sole | 2022-10-24 | |
| 2022-06-30 | $59,187,564 | 649,200 | Shares | Sole | 2022-08-01 | |
| 2022-03-31 | $51,796,524 | 631,280 | Shares | Sole | 2022-05-03 | |
| 2021-12-31 | $61,249,001 | 799,178 | Shares | Sole | 2022-02-01 | |
| 2021-09-30 | $60,821,674 | 809,768 | Shares | Sole | 2021-10-26 | |
| 2021-06-30 | $59,061,571 | 759,439 | Shares | Sole | 2021-07-22 | |
| 2021-03-31 | $49,660,017 | 644,182 | Shares | Sole | 2021-04-12 | |
| 2020-12-31 | $51,708,537 | 632,134 | Shares | Sole | 2021-01-27 | |
| 2020-09-30 | $53,846,851 | 649,148 | Shares | Sole | 2020-10-26 | |
| 2020-06-30 | $53,004,247 | 685,429 | Shares | Sole | 2020-07-27 | |
| 2020-03-31 | $60,070,649 | 780,747 | Shares | Sole | 2020-04-28 | |
| No filing history on record for this holder in this stock. | ||||||