Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionMn Services Vermogensbeheer B.V.
Latest Disclosed Ownership973,621 shares
Latest Disclosed Value $ 117,117
Mn Services Vermogensbeheer B.V. reports 0.10% decrease in ownership of MRK / Merck & Co., Inc.

On April 30, 2026 - Mn Services Vermogensbeheer B.V. filed a 13F-HR form disclosing ownership of 973,621 shares of Merck & Co., Inc. (MX:MRK) valued at $117,117 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 15, 2026 disclosing 974,621 shares of Merck & Co., Inc.. This represents a change in shares of -0.10% 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)
2026-04-30 2026-03-31 13F MERCK COM 58933Y105 973,621 -1,000 -0.10 117 14.71 0.7733
2026-01-15 2025-12-31 13F MERCK COM 58933Y105 974,621 19,422 2.03 103 27.50 0.6312
2025-10-31 2025-09-30 13F MERCK COM 58933Y105 955,199 14,500 1.54 80 8.11 0.5183
2025-07-10 2025-06-30 13F MERCK COM 58933Y105 940,699 7,500 0.80 74 -10.84 0.5181
2025-04-17 2025-03-31 13F MERCK COM 58933Y105 933,199 -67,700 -6.76 84 -16.16 0.6485
2025-02-05 2024-12-31 13F MERCK COM 58933Y105 1,000,899 22,300 2.28 100 -10.81 0.6709
2024-10-30 2024-09-30 13F MERCK COM 58933Y105 978,599 -24,300 -2.42 111 -10.48 0.7792
2024-07-25 2024-06-30 13F MERCK COM 58933Y105 1,002,899 -15,300 -1.50 124 -7.46 0.8968
2024-04-29 2024-03-31 13F MERCK COM 58933Y105 1,018,199 -185,400 -15.40 134 2.29 0.9751
2024-01-29 2023-12-31 13F MERCK COM 58933Y105 1,203,599 -29,700 -2.41 131 3.97 1.1819
2023-10-25 2023-09-30 13F MERCK COM 58933Y105 1,233,299 21,100 1.74 127 -9.35 1.2243
2023-08-09 2023-06-30 13F MERCK COM 58933Y105 1,212,199 -45,700 -3.63 140 4.51 1.3048
2023-04-26 2023-03-31 13F MERCK COM 58933Y105 1,257,899 43,500 3.58 134 -0.75 1.3789
2023-02-03 2022-12-31 13F MERCK COM 58933Y105 1,214,399 -189,700 -13.51 135 -99.89 1.5100
2022-11-01 2022-09-30 13F MERCK COM 58933Y105 1,404,099 -87,600 -5.87 120,921 -11.09 1.2734
2022-08-03 2022-06-30 13F MERCK COM 58933Y105 1,491,699 -322,000 -17.75 135,998 -8.61 1.2675
2022-05-10 2022-03-31 13F MERCK COM 58933Y105 1,813,699 -117,500 -6.08 148,814 0.55 0.9902
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 1,931,199 42,400 2.24 148,007 4.33 0.8668
2021-11-03 2021-09-30 13F MERCK COM 58933Y105 1,888,799 33,300 1.79 141,868 16.59 0.8756
2021-08-05 2021-06-30 13F MERCK COM 58933Y105 1,855,499 -376,700 -16.88 121,681 -33.36 0.9450
2021-02-09 2020-12-31 13F MERCK COM 58933Y105 2,232,199 27,500 1.25 182,593 -0.16 1.2890
2020-11-04 2020-09-30 13F MERCK COM 58933Y105 2,204,699 34,900 1.61 182,880 8.99 1.4391
2020-07-23 2020-06-30 13F MERCK COM 58933Y105 2,169,799 -38,000 -1.72 167,791 -1.22 1.4347
2020-05-12 2020-03-31 13F MERCK COM 58933Y105 2,207,799 -139,100 -5.93 169,868 -20.42 1.9006
2020-02-12 2019-12-31 13F MERCK COM 58933Y105 2,346,899 75,100 3.31 213,450 11.61 1.8190
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 2,271,799 946,495 71.42 191,240 72.09 1.7741
2019-07-25 2019-06-30 13F MERCK COM 58933Y105 1,325,304 -151,400 -10.25 111,127 -9.52 1.3056
2019-05-06 2019-03-31 13F MERCK COM 58933Y105 1,476,704 2,500 0.17 122,817 24.64 1.4206
2019-02-12 2018-12-31 13F MERCK COM 58933Y105 1,474,204 1,042,299 241.33 98,538 221.61 1.4958
2018-11-02 2018-09-30 13F MERCK & CO INC COM 58933Y105 431,905 3,000 0.70 30,639 17.68 0.7183
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 428,905 0 0.00 26,035 11.44 0.6529
2018-05-11 2018-03-31 13F MERCK & CO INC COM 58933Y105 428,905 3,400 0.80 23,362 17.16 0.6089
2018-02-02 2017-12-31 13F MERCK & CO INC COM 58933Y105 425,505 -25,600 -5.67 19,940 -30.97 0.6272
2017-11-01 2017-09-30 13F MERCK COM 58933Y105 451,105 -1,400 -0.31 28,884 -0.40 0.7589
2017-07-14 2017-06-30 13F MERCK & CO INC COM 58933Y105 452,505 378,815 514.07 29,001 562.43 0.7978
2017-04-24 2017-03-31 13F MERCK & CO INC COM 58933Y105 73,690 1,801 2.51 4,378 9.12 0.8466
2017-01-11 2016-12-31 13F MERCK & CO INC COM 58933Y105 71,889 280 0.39 4,012 -10.23 0.8181
2016-11-08 2016-09-30 13F MERCK & CO INC COM 58933Y105 71,609 1,170 1.66 4,469 22.34 0.8903
2016-08-05 2016-06-30 13F MERCK & CO INC COM 58933Y105 70,439 419 0.60 3,653 12.37 0.8446
2016-04-28 2016-03-31 13F MERCK & CO INC COM 58933Y105 70,020 70,020 3,251 0.7560
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.