Calamos Advisors LLC: MRK position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Calamos Advisors LLC on MRK, newest first. How the timeline and the estimate are built.

Calamos Advisors LLC held 671,314 MRK shares at 2026-06-30 per its 13F-HR filed 2026-07-31.

the latest 13F is the newest step

period ended2026-06-30
13F 671,314 shares
Change vs previous 13F -127,161 shares
0.28% of the 13F portfolio, value $86,263,850.
13F-HR 0001316507-26-000003 filed by Calamos Advisors LLC
Filed 2026-07-31 (acceptance time not in the bulk data set), ingested 2026-10-06 09:57:27 UTC
- Calamos Advisors LLC: 650,503 shares
- Calamos Wealth Management LLC: 20,811 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2026-03-31
13F 798,475 shares
Change vs previous 13F +59,379 shares
0.33% of the 13F portfolio, value $96,048,557.
13F-HR 0001316507-26-000002 filed by Calamos Advisors LLC
Filed 2026-05-04 (acceptance time not in the bulk data set), ingested 2026-10-06 09:58:43 UTC
- Calamos Advisors LLC: 777,663 shares
- Calamos Wealth Management LLC: 20,812 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-12-31
13F 739,096 shares
Change vs previous 13F +213,135 shares
0.29% of the 13F portfolio, value $77,797,245.
13F-HR 0001316507-26-000001 filed by Calamos Advisors LLC
Filed 2026-01-29 (acceptance time not in the bulk data set), ingested 2026-10-07 03:01:36 UTC
- Calamos Advisors LLC: 719,806 shares
- Calamos Wealth Management LLC: 19,290 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-09-30
13F 525,961 shares
Change vs previous 13F +1,338 shares
0.16% of the 13F portfolio, value $44,143,907.
13F-HR 0001316507-25-000003 filed by Calamos Advisors LLC
Filed 2025-10-20 (acceptance time not in the bulk data set), ingested 2026-10-07 03:02:25 UTC
- Calamos Advisors LLC: 510,200 shares
- Calamos Wealth Management LLC: 15,761 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-06-30
13F 524,623 shares
Change vs previous 13F -161,632 shares
0.16% of the 13F portfolio, value $41,529,157.
13F-HR 0001085146-25-004696 filed by Calamos Advisors LLC
Filed 2025-08-08 (acceptance time not in the bulk data set), ingested 2026-10-07 18:23:11 UTC
- Calamos Advisors LLC: 510,213 shares
- Calamos Wealth Management LLC: 14,410 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-03-31
13F 686,255 shares
Change vs previous 13F -186,616 shares
0.27% of the 13F portfolio, value $61,598,248.
13F-HR 0001085146-25-002415 filed by Calamos Advisors LLC
Filed 2025-04-29 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:06 UTC
- Calamos Advisors LLC: 668,215 shares
- Calamos Wealth Management LLC: 18,040 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2024-12-31
13F 872,871 shares
Change vs previous 13F -220,345 shares
0.37% of the 13F portfolio, value $86,833,173.
13F-HR 0001085146-25-000482 filed by Calamos Advisors LLC
Filed 2025-01-24 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:55 UTC
- Calamos Advisors LLC: 852,847 shares
- Calamos Wealth Management LLC: 20,024 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2024-09-30
13F 1,093,216 shares
Change vs previous 13F not available
0.53% of the 13F portfolio, value $124,145,653.
13F-HR 0001085146-24-005402 filed by Calamos Advisors LLC
Filed 2024-11-07 (acceptance time not in the bulk data set), ingested 2026-10-07 18:26:56 UTC
- Calamos Advisors LLC: 953,704 shares
- Calamos Wealth Management LLC: 139,512 shares
Acceptance time not in the bulk data set (spec §4.2).