Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionPrivate Management Group Inc
Latest Disclosed Ownership22,402 shares
Latest Disclosed Value $ 2,694,737
Private Management Group Inc reports 2.24% decrease in ownership of MRK / Merck & Co., Inc.

On May 8, 2026 - Private Management Group Inc filed a 13F-HR form disclosing ownership of 22,402 shares of Merck & Co., Inc. (MX:MRK) valued at $2,694,737 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 22,916 shares of Merck & Co., Inc.. This represents a change in shares of -2.24% 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)
2026-05-08 2026-03-31 13F MERCK COM 58933Y105 22,402 -514 -2.24 2,695 11.69 0.0776
2026-02-11 2025-12-31 13F MERCK COM 58933Y105 22,916 -135 -0.59 2,412 24.72 0.0702
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 23,051 -292 -1.25 1,935 4.71 0.0576
2025-08-12 2025-06-30 13F MERCK COM 58933Y105 23,343 10,033 75.38 1,848 54.69 0.0611
2025-05-07 2025-03-31 13F MERCK COM 58933Y105 13,310 -1,825 -12.06 1,195 -20.66 0.0430
2025-01-27 2024-12-31 13F MERCK COM 58933Y105 15,135 34 0.23 1,506 -12.19 0.0547
2024-10-29 2024-09-30 13F MERCK COM 58933Y105 15,101 -363 -2.35 1,715 -10.45 0.0605
2024-08-06 2024-06-30 13F MERCK COM 58933Y105 15,464 -249 -1.58 1,914 -7.67 0.0736
2024-05-08 2024-03-31 13F MERCK COM 58933Y105 15,713 -31 -0.20 2,073 20.80 0.0785
2024-02-02 2023-12-31 13F MERCK COM 58933Y105 15,744 187 1.20 1,716 7.18 0.0657
2023-10-30 2023-09-30 13F MERCK COM 58933Y105 15,557 0 0.00 1,602 -10.81 0.0657
2023-08-07 2023-06-30 13F MERCK COM 58933Y105 15,557 29 0.19 1,795 8.66 0.0763
2023-05-08 2023-03-31 13F MERCK COM 58933Y105 15,528 -2,315 -12.97 1,652 -16.52 0.0743
2023-02-03 2022-12-31 13F MERCK COM 58933Y105 17,843 -10,813 -37.73 1,980 -19.78 0.0879
2023-02-07 2022-09-30 13F/A-2 MERCK COM 58933Y105 28,656 -178 -0.62 2,468 -6.16 0.1150
2023-02-06 2022-09-30 13F/A-1 MERCK COM 58933Y105 28,656 -178 2 0.1150
2022-11-08 2022-09-30 13F MERCK COM 58933Y105 28,656 -178 2,468 0.1150
2022-08-05 2022-06-30 13F MERCK COM 58933Y105 28,834 2 0.01 2,629 11.12 0.1152
2022-05-06 2022-03-31 13F MERCK COM 58933Y105 28,832 117 0.41 2,366 7.50 0.0959
2022-02-08 2021-12-31 13F MERCK COM 58933Y105 28,715 -200 -0.69 2,201 1.34 0.0882
2021-11-09 2021-09-30 13F/A-1 MERCK COM 58933Y105 28,915 0 0.00 2,172 -3.42 0.0907
2021-11-05 2021-09-30 13F MERCK COM 58933Y105 28,915 0 2,249 0.0986
2021-07-23 2021-06-30 13F MERCK COM 58933Y105 28,915 10,000 52.87 2,249 54.25 0.0986
2021-05-11 2021-03-31 13F MERCK & CO. COM 58933Y105 18,915 0 0.00 1,458 -5.75 0.0667
2021-02-03 2020-12-31 13F MERCK & CO. COM 58933Y105 18,915 2,515 15.34 1,547 13.75 0.0788
2020-11-12 2020-09-30 13F MERCK & CO. COM 58933Y105 16,400 -100 -0.61 1,360 6.58 0.0887
2020-08-13 2020-06-30 13F MERCK & CO. COM 58933Y105 16,500 -250 -1.49 1,276 -1.01 0.0886
2020-05-13 2020-03-31 13F MERCK & CO. COM 58933Y105 16,750 -2,450 -12.76 1,289 -26.17 0.1050
2020-02-12 2019-12-31 13F MERCK COM 58933Y105 19,200 -1,050 -5.19 1,746 2.40 0.0863
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 20,250 -1,627 -7.44 1,705 -7.03 0.0905
2019-08-12 2019-06-30 13F MERCK COM 58933Y105 21,877 -2,573 -10.52 1,834 -9.83 0.0942
2019-05-10 2019-03-31 13F MERCK COM 58933Y105 24,450 -18,422 -42.97 2,034 -37.91 0.1011
2019-02-06 2018-12-31 13F MERCK COM 58933Y105 42,872 -450 -1.04 3,276 6.61 0.1792
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 43,322 506 1.18 3,073 18.24 0.1442
2018-08-16 2018-06-30 13F/A-1 MERCK COM 58933Y105 42,816 -390 -0.90 2,599 10.45 0.1273
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 42,816 -390 2,599
2018-05-11 2018-03-31 13F MERCK COM 58933Y105 43,206 -20 -0.05 2,353 -3.25 0.1258
2018-02-12 2017-12-31 13F MERCK COM 58933Y105 43,226 -384 -0.88 2,432 -12.89 0.1252
2017-11-07 2017-09-30 13F MERCK COM 58933Y105 43,610 -219,992 -83.46 2,792 -83.47 0.1474
2017-08-09 2017-06-30 13F MERCK COM 58933Y105 263,602 -22,650 -7.91 16,894 -7.11 0.9255
2017-05-09 2017-03-31 13F MERCK COM 58933Y105 286,252 -67,656 -19.12 18,188 -12.70 1.0295
2017-04-07 2016-12-31 13F/A-1 MERCK COM 58933Y105 353,908 -8,573 -2.37 20,835 -7.90 1.1757
2017-02-03 2016-12-31 13F MERCK COM 58933Y105 353,908 20,835
2017-04-07 2016-09-30 13F/A-1 MERCK COM 58933Y105 362,481 -9,982 -2.68 22,622 5.42 1.4013
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 362,481 22,622
2017-04-07 2016-06-30 13F/A-1 MERCK COM 58933Y105 372,463 -33,284 -8.20 21,458 -0.05 1.4076
2016-08-11 2016-06-30 13F MERCK COM 58933Y105 372,463 21,458
2017-04-07 2016-03-31 13F/A-1 MERCK & CO INC COM 58933Y105 405,747 -4,531 -1.10 21,468 -0.94 1.3750
2016-05-05 2016-03-31 13F MERCK & CO INC COM 58933Y105 405,747 21,468
2017-04-07 2015-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 410,278 37,764 10.14 21,671 17.79 1.3431
2016-02-03 2015-12-31 13F MERCK & CO INC COM 58933Y105 410,278 21,671
2017-04-07 2015-09-30 13F/A-1 MERCK & CO INC COM 58933Y105 372,514 -2,677 -0.71 18,398 -13.87 1.1893
2015-11-09 2015-09-30 13F MERCK & CO INC COM 58933Y105 372,514 18,398
2015-07-30 2015-06-30 13F MERCK & CO INC COM 58933Y105 375,191 -7,469 -1.95 21,360 -2.89 1.3993
2015-05-11 2015-03-31 13F MERCK & CO INC COM 58933Y105 382,660 -3,551 -0.92 21,995 0.28 1.4078
2015-02-06 2014-12-31 13F MERCK & CO INC COM 58933Y105 386,211 -1,231 -0.32 21,933 -4.51 1.3752
2014-11-07 2014-09-30 13F MERCK & CO INC COM 58933Y105 387,442 -750 -0.19 22,968 2.28 1.4711
2014-08-11 2014-06-30 13F MERCK & CO INC COM 58933Y105 388,192 81,078 26.40 22,457 28.80 1.3879
2014-05-09 2014-03-31 13F MERCK & CO INC COM 58933Y105 307,114 -7,955 -2.52 17,435 10.57 1.1597
2014-02-10 2013-12-31 13F MERCK & CO INC COM 58933Y105 315,069 -1,731 -0.55 15,769 4.55 1.0736
2013-11-14 2013-09-30 13F MERCK & CO INC COM 58933Y105 316,800 -225,924 -41.63 15,083 -40.17 1.0684
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 542,724 542,724 25,210 1.8069
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.