Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionAncora Advisors, LLC
Latest Disclosed Ownership22,292 shares
Latest Disclosed Value $ 2,681,538
Ancora Advisors, LLC reports 1.73% decrease in ownership of 6MK / Merck & Co., Inc.

On May 15, 2026 - Ancora Advisors, LLC filed a 13F-HR form disclosing ownership of 22,292 shares of Merck & Co., Inc. (BG:6MK) valued at $2,681,538 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 22,684 shares of Merck & Co., Inc.. This represents a change in shares of -1.73% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 22,292 -392 -1.73 2,682 12.32 0.0335
2026-02-17 2025-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 22,684 -908 -3.85 2,388 20.56 0.0492
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 23,592 -3,485 -12.87 1,980 -7.61 0.0396
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 27,077 -1,727 -6.00 2,143 -17.10 0.0445
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 28,804 703 2.50 2,585 -7.51 0.0577
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 28,101 -1,819 -6.08 2,795 -17.72 0.0624
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 29,920 -14,687 -32.93 3,398 -38.48 0.0774
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 44,607 212 0.48 5,522 -5.72 0.1368
2024-05-16 2024-03-31 13F MERCK COM 58933Y105 44,395 -1,392 -3.04 5,858 17.35 0.1331
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 45,787 1,537 3.47 4,992 9.57 0.1172
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 44,250 309 0.70 4,556 -10.16 0.1209
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 43,941 1,990 4.74 5,070 13.60 0.1334
2023-05-16 2023-03-31 13F MERCK COM 58933Y105 41,951 135 0.32 4,463 -3.79 0.1266
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 41,816 249 0.60 4,639 29.58 0.1336
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 41,567 -1,571 -3.64 3,580 -8.98 0.1106
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 43,138 -464 -1.06 3,933 9.95 0.1108
2022-05-16 2022-03-31 13F/A-1 MERCK COM 58933Y105 43,602 -1,533 -3.40 3,577 3.41 0.0868
2022-05-13 2022-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 46,550 1,415 3,589 0.0619
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 45,135 250 0.56 3,459 2.61 0.0820
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 44,885 96 0.21 3,371 -3.22 0.0871
2021-11-12 2021-06-30 13F/A-1 MERCK COM 58933Y105 44,789 -1,761 -3.78 3,483 -2.95 0.0910
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 44,789 -1,761 3,483 0.0910
2021-11-12 2021-03-31 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 46,550 1,756 3.92 3,589 -2.05 0.0991
2021-05-14 2021-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 46,550 1,756 3,589 0.0991
2021-11-12 2020-12-31 13F/A-1 MERCK & CO. COM 58933Y105 44,794 295 0.66 3,664 -0.76 0.1180
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 44,794 295 3,664 0.1180
2021-11-12 2020-09-30 13F/A-1 MERCK & CO. COM 58933Y105 44,499 -829 -1.83 3,692 5.34 0.1466
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 44,499 -829 3,692 0.1466
2021-11-12 2020-06-30 13F/A-1 MERCK & CO. COM 58933Y105 45,328 234 0.52 3,505 1.01 0.1467
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 45,328 234 3,505 0.1467
2021-11-12 2020-03-31 13F/A-1 MERCK COM 58933Y105 45,094 -296 -0.65 3,470 -15.94 0.1605
2020-05-14 2020-03-31 13F MERCK COM 58933Y105 45,094 -296 3,470 0.1605
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 45,390 598 1.34 4,128 9.47 0.1536
2019-11-19 2019-09-30 13F/A-2 MERCK COM 58933Y105 44,792 -318 -0.70 3,771 -0.29 0.1645
2019-11-18 2019-09-30 13F/A-1 MERCK COM 58933Y105 44,792 -318 3,771 0.1645
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 44,792 -318 3,771 0.1653
2019-11-14 2019-06-30 13F/A-1 MERCK COM 58933Y105 45,110 -9,955 -18.08 3,782 -17.42 0.1696
2019-08-12 2019-06-30 13F MERCK COM 58933Y105 45,110 -9,955 3,782 156,212.8907
2019-11-14 2019-03-31 13F/A-1 MERCK COM 58933Y105 55,065 -3,348 -5.73 4,580 2.60 0.2078
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 55,065 -3,348 4,580 190,795.5717
2019-11-14 2018-12-31 13F/A-1 MERCK COM 58933Y105 58,413 -1,116 -1.87 4,464 5.71 0.2146
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 58,413 -1,116 4,464
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 59,529 11,150 23.05 4,223 43.79 0.1627
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 48,379 11,333 30.59 2,937 45.54 0.1275
2018-05-15 2018-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 37,046 2,315 6.67 2,018 3.28 0.0908
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 34,731 946 2.80 1,954 -9.70 0.1043
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 33,785 4,083 13.75 2,164 13.72 0.1254
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 29,702 -350 -1.16 1,903 -0.31 0.1233
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 30,052 -355 -1.17 1,909 6.71 0.1293
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 30,407 5,525 22.20 1,789 15.20 0.1305
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 24,882 909 3.79 1,553 12.45 0.1572
2016-08-11 2016-06-30 13F MERCK COM 58933Y105 23,973 -2,058 -7.91 1,381 0.29 0.1606
2016-05-13 2016-03-31 13F MERCK & CO INC COM 58933Y105 26,031 0 0.00 1,377 0.15 0.1691
2016-02-12 2015-12-31 13F/A MERCK & CO INC COM 58933Y105 26,031 650 2.56 1,375 9.65 0.1759
2016-02-11 2015-12-31 13F MERCK & CO INC COM 58933Y105 25,780 399 1,464 0.1924
2015-10-30 2015-09-30 13F MERCK & CO INC COM 58933Y105 25,381 286 1.14 1,254 -12.25 0.1614
2015-07-30 2015-06-30 13F MERCK & CO INC COM 58933Y105 25,095 25,095 0.00 1,429 -4.29 0.1679
2015-05-15 2015-03-31 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 0 -25,780 -100.00 1,493 1.98 0.1827
2015-05-15 2015-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 0 1,493
2015-02-11 2014-12-31 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 25,780 4,141 19.14 1,464 14.11 0.1786
2015-02-11 2014-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 25,780 4,141 1,464 0.1786
2014-11-07 2014-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 21,639 -1,500 -6.48 1,283 -4.18 0.1646
2014-07-31 2014-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 23,139 35 0.15 1,339 2.06 0.1735
2014-05-13 2014-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 23,104 -4,800 -17.20 1,312 -6.08 0.1854
2014-02-07 2013-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 27,904 0 0.00 1,397 5.20 0.2109
2013-10-31 2013-09-30 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 27,904 500 1.82 1,328 4.32 0.2279
2013-10-25 2013-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 27,904 1,328
2013-07-22 2013-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 27,404 27,404 1,273 0.2182
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.