Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRnc Capital Management Llc
Latest Disclosed Ownership505,611 shares
Latest Disclosed Value $ 53,220,644
Rnc Capital Management Llc reports 0.15% increase in ownership of MRK / Merck & Co., Inc.

On February 3, 2026 - Rnc Capital Management Llc filed a 13F-HR form disclosing ownership of 505,611 shares of Merck & Co., Inc. (MX:MRK) valued at $53,220,644 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 504,850 shares of Merck & Co., Inc.. This represents a change in shares of 0.15% 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)
2026-02-03 2025-12-31 13F MERCK COM 58933Y105 505,611 761 0.15 53,221 25.60 2.4223
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 504,850 133,326 35.89 42,372 44.08 1.9491
2025-07-30 2025-06-30 13F MERCK COM 58933Y105 371,524 -22,163 -5.63 29,410 -16.78 1.4261
2025-05-16 2025-03-31 13F MERCK COM 58933Y105 393,687 105,798 36.75 35,337 23.39 1.8032
2025-01-28 2024-12-31 13F MERCK COM 58933Y105 287,889 258,910 893.44 28,639 698.41 1.5289
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 28,979 0 0.00 3,588 0.00 0.1989
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 28,979 2,711 10.32 3,588 3.49 0.1989
2024-08-07 2024-03-31 13F MERCK COM 58933Y105 26,268 4,753 22.09 3,466 47.80 0.1974
2024-01-17 2023-12-31 13F MERCK COM 58933Y105 21,515 -5,750 -21.09 2,346 -16.43 0.1405
2023-12-27 2023-09-30 13F MERCK COM 58933Y105 27,265 -881 -3.13 2,807 93,433.33 0.1741
2023-07-21 2023-06-30 13F MERCK& COM 58933Y105 28,146 19,669 232.03 3 0.1796
2023-04-21 2023-03-31 13F MERCK& COM 58933Y105 8,477 166 2.00 1 0.0509
2023-01-11 2022-12-31 13F MERCK& COM 58933Y105 8,311 -531 -6.01 1 -100.00 0.0517
2022-10-18 2022-09-30 13F MERCK& COM 58933Y105 8,842 -383 -4.15 762 -9.39 0.0478
2022-07-22 2022-06-30 13F MERCK& COM 58933Y105 9,225 -147 -1.57 841 9.36 0.0479
2022-07-22 2022-03-31 13F MERCK& COM 58933Y105 9,372 -1,070 -10.25 769 -3.87 0.0390
2022-02-04 2021-12-31 13F MERCK& COM 58933Y105 10,442 1,199 12.97 800 15.27 0.0396
2021-11-02 2021-09-30 13F MERCK& COM 58933Y105 9,243 -351 -3.66 694 -6.97 0.0369
2021-07-20 2021-06-30 13F MERCK& COM 58933Y105 9,594 0 0.00 746 0.81 0.0395
2021-04-26 2021-03-31 13F MERCK& COM 58933Y105 9,594 -3,894 -28.87 740 -32.91 0.0418
2021-01-13 2020-12-31 13F MERCK& COM 58933Y105 13,488 -1,726 -11.34 1,103 -12.60 0.0685
2020-12-03 2020-09-30 13F MERCK& COM 58933Y105 15,214 -679 -4.27 1,262 2.69 0.0895
2020-07-23 2020-06-30 13F MERCK& COM 58933Y105 15,893 -288 -1.78 1,229 -1.29 0.0886
2020-04-22 2020-03-31 13F MERCK& COM 58933Y105 16,181 -1,006 -5.85 1,245 -20.35 0.1062
2020-03-09 2019-12-31 13F MERCK& COM 58933Y105 17,187 2,242 15.00 1,563 24.24 0.0987
2020-07-22 2019-09-30 13F MERCK& COM 58933Y105 14,945 72 0.48 1,258 0.88 0.0894
2019-07-25 2019-06-30 13F MERCK& COM 58933Y105 14,873 184 1.25 1,247 2.05 0.0867
2019-04-18 2019-03-31 13F MERCK& COM 58933Y105 14,689 -1,754 -10.67 1,222 -2.71 0.0852
2019-01-15 2018-12-31 13F MERCK& COM 58933Y105 16,443 648 4.10 1,256 12.04 0.0950
2018-10-25 2018-09-30 13F MERCK& COM 58933Y105 15,795 102 0.65 1,121 17.63 0.0740
2018-07-20 2018-06-30 13F MERCK& COM 58933Y105 15,693 -3,353 -17.60 953 -8.10 0.0671
2018-04-11 2018-03-31 13F MERCK& COM 58933Y105 19,046 2,271 13.54 1,037 9.85 0.0766
2018-01-17 2017-12-31 13F MERCK& COM 58933Y105 16,775 1,106 7.06 944 -5.88 0.0653
2017-10-16 2017-09-30 13F MERCK& COM 58933Y105 15,669 -6 -0.04 1,003 -0.20 0.0755
2017-08-21 2017-06-30 13F MERCK& COM 58933Y105 15,675 206 1.33 1,005 2.24 0.0778
2017-05-04 2017-03-31 13F MERCK& COM 58933Y105 15,469 -2,406 -13.46 983 -6.56 0.0783
2017-02-01 2016-12-31 13F MERCK& COM 58933Y105 17,875 1,171 7.01 1,052 0.86 0.0869
2016-10-18 2016-09-30 13F MERCK& COM 58933Y105 16,704 -602 -3.48 1,043 4.61 0.0927
2016-07-22 2016-06-30 13F MERCK& COM 58933Y105 17,306 240 1.41 997 10.41 0.0932
2016-04-14 2016-03-31 13F MERCK& COM 58933Y105 17,066 473 2.85 903 3.08 0.0892
2016-01-13 2015-12-31 13F MERCK& COM 58933Y105 16,593 5,993 56.54 876 67.18 0.0879
2015-11-03 2015-09-30 13F MERCK& COM 58933Y105 10,600 -1,050 -9.01 524 -20.97 0.0505
2015-07-30 2015-06-30 13F MERCK& COM 58933Y105 11,650 -673 -5.46 663 -6.36 0.0565
2015-05-06 2015-03-31 13F MERCK& COM 58933Y105 12,323 -409 -3.21 708 -2.07 0.0594
2015-01-21 2014-12-31 13F MERCK& COM 58933Y105 12,732 621 5.13 723 0.70 0.0592
2014-10-24 2014-09-30 13F MERCK& COM 58933Y105 12,111 -2,121 -14.90 718 -12.76 0.0576
2014-08-15 2014-06-30 13F MERCK& COM 58933Y105 14,232 -275 -1.90 823 -0.12 0.0663
2014-05-09 2014-03-31 13F MERCK& COM 58933Y105 14,507 -12,076 -45.43 824 -38.05 0.0716
2014-01-17 2013-12-31 13F MERCK& COM 58933Y105 26,583 -590,798 -95.69 1,330 -95.48 0.1185
2013-10-22 2013-09-30 13F MERCK& COM 58933Y105 617,381 25,266 4.27 29,393 6.87 2.9602
2013-08-02 2013-06-30 13F/A-1 MERCK& COM 58933Y105 592,115 592,115 27,504 2.9065
2013-07-18 2013-06-30 13F MERCK& COM 58933Y105 19,005 885
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.