Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRMB Capital Management, LLC
Latest Disclosed Ownership443,638 shares
Latest Disclosed Value $ 53,709,259
RMB Capital Management, LLC reports 0.09% increase in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - RMB Capital Management, LLC filed a 13F-HR form disclosing ownership of 443,638 shares of Merck & Co., Inc. (MX:MRK) valued at $53,709,259 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 443,222 shares of Merck & Co., Inc.. This represents a change in shares of 0.09% 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 COM 58933Y105 443,638 416 0.09 53,709 14.34 0.7234
2026-02-17 2025-12-31 13F MERCK COM 58933Y105 443,222 52,799 13.52 46,972 42.27 0.8139
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 390,423 -2,365 -0.60 33,015 5.35 0.6058
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 392,788 65,987 20.19 31,338 6.08 0.5948
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 326,801 114,757 54.12 29,540 40.04 0.7285
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 212,044 14,562 7.37 21,094 -5.94 0.4861
2024-11-06 2024-09-30 13F MERCK COM 58933Y105 197,482 -22,942 -10.41 22,426 -17.82 0.5092
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 220,424 -7,735 -3.39 27,288 -9.36 0.6543
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 228,159 82,643 56.79 30,106 89.77 0.6898
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 145,516 9,464 6.96 15,864 13.27 0.4845
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 136,052 9,958 7.90 14,007 -3.74 0.4791
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 126,094 6,674 5.59 14,550 14.52 0.4779
2023-05-11 2023-03-31 13F MERCK COM 58933Y105 119,420 21,377 21.80 12,705 16.81 0.4438
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 98,043 20,309 26.13 10,878 62.49 0.3869
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 77,734 24,434 45.84 6,694 37.76 0.2494
2022-08-16 2022-06-30 13F/A-1 MERCK COM 58933Y105 53,300 8,258 18.33 4,859 31.47 0.1672
2022-08-01 2022-06-30 13F MERCK COM 58933Y105 53,300 8,258 4,859 0.1809
2022-05-06 2022-03-31 13F MERCK COM 58933Y105 45,042 4,103 10.02 3,696 17.78 0.1168
2022-01-26 2021-12-31 13F MERCK COM 58933Y105 40,939 1,398 3.54 3,138 5.66 0.0947
2021-10-20 2021-09-30 13F MERCK COM 58933Y105 39,541 2 0.01 2,970 -3.41 0.0975
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 39,539 6,083 18.18 3,075 19.23 0.1029
2021-05-12 2021-03-31 13F MERCK & CO. COM 58933Y105 33,456 4,607 15.97 2,579 9.28 0.0953
2021-02-11 2020-12-31 13F MERCK & CO. COM 58933Y105 28,849 8,247 40.03 2,360 38.09 0.0863
2020-11-10 2020-09-30 13F MERCK & CO. COM 58933Y105 20,602 4,155 25.26 1,709 34.36 0.0739
2020-08-05 2020-06-30 13F MERCK & CO. COM 58933Y105 16,447 -36,507 -68.94 1,272 -68.78 0.0560
2020-05-11 2020-03-31 13F MERCK & CO. COM 58933Y105 52,954 1,798 3.51 4,074 -12.44 0.1934
2020-02-13 2019-12-31 13F MERCK COM 58933Y105 51,156 -505 -0.98 4,653 6.99 0.1293
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 51,661 -12,442 -19.41 4,349 -19.09 0.1143
2019-08-13 2019-06-30 13F MERCK COM 58933Y105 64,103 -28,356 -30.67 5,375 -30.10 0.1360
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 92,459 1,340 1.47 7,690 10.46 0.1943
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 91,119 6,847 8.12 6,962 16.46 0.1777
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 84,272 -11,205 -11.74 5,978 3.16 0.1435
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 95,477 71,891 304.80 5,795 350.97 0.1379
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 23,586 -14,358 -37.84 1,285 -39.81 0.0329
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 37,944 9,336 32.63 2,135 16.54 0.0554
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 28,608 -307 -1.06 1,832 -1.13 0.0473
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 28,915 213 0.74 1,853 1.59 0.0530
2017-05-12 2017-03-31 13F MERCK COM 58933Y105 28,702 4,837 20.27 1,824 29.82 0.0754
2017-03-10 2016-12-31 13F/A-1 MERCK COM 58933Y105 23,865 19,400 434.49 1,405 403.58 0.0756
2017-02-13 2016-12-31 13F MERCK COM 58933Y105 23,865 1,405
2016-11-17 2016-09-30 13F/A-1 MERCK COM 58933Y105 4,465 259 6.16 279 15.29 0.0152
2016-11-02 2016-09-30 13F MERCK COM 58933Y105 4,465 279
2016-08-03 2016-06-30 13F MERCK COM 58933Y105 4,206 165 4.08 242 13.08 0.0126
2016-05-09 2016-03-31 13F MERCK & CO INC COM 58933Y105 4,041 4,041 214 0.0139
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.