Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRoman Butler Fullerton & Co
Latest Disclosed Ownership8,451 shares
Latest Disclosed Value $ 1,041,027
Roman Butler Fullerton & Co reports 0.64% increase in ownership of MRK / Merck & Co., Inc.

On April 30, 2026 - Roman Butler Fullerton & Co filed a 13F-HR form disclosing ownership of 8,451 shares of Merck & Co., Inc. (MX:MRK) valued at $1,041,027 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 8,397 shares of Merck & Co., Inc.. This represents a change in shares of 0.64% 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 8,451 54 0.64 1,041 13.65 0.2863
2026-01-26 2025-12-31 13F MERCK COM 58933Y105 8,397 -83 -0.98 917 24.80 0.2404
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 8,480 -112 -1.30 734 0.96 0.1970
2025-07-30 2025-06-30 13F MERCK COM 58933Y105 8,592 -1,103 -11.38 728 -4.22 0.2145
2025-04-21 2025-03-31 13F MERCK COM 58933Y105 9,695 -494 -4.85 760 -23.87 0.2950
2025-01-30 2024-12-31 13F MERCK COM 58933Y105 10,189 -759 -6.93 998 -18.35 0.3166
2024-10-29 2024-09-30 13F MERCK COM 58933Y105 10,948 295 2.77 1,221 -9.96 0.3674
2024-07-15 2024-06-30 13F MERCK COM 58933Y105 10,653 -570 -5.08 1,356 -4.78 0.4386
2024-04-29 2024-03-31 13F MERCK COM 58933Y105 11,223 -188 -1.65 1,425 3.34 0.5340
2024-01-31 2023-12-31 13F MERCK COM 58933Y105 11,411 -67 -0.58 1,379 15.51 0.5365
2023-10-18 2023-09-30 13F MERCK COM 58933Y105 11,478 -621 -5.13 1,194 -6.87 0.5635
2023-07-25 2023-06-30 13F MERCK COM 58933Y105 12,099 -2,517 -17.22 1,282 -24.78 0.5883
2023-04-27 2023-03-31 13F MERCK COM 58933Y105 14,616 2,016 16.00 1,703 22.43 0.8473
2023-01-23 2022-12-31 13F MERCK COM 58933Y105 12,600 1,074 9.32 1,392 32.60 0.7199
2022-10-17 2022-09-30 13F MERCK COM 58933Y105 11,526 46 0.40 1,049 -3.76 0.6670
2022-07-26 2022-06-30 13F MERCK COM 58933Y105 11,480 89 0.78 1,090 16.58 0.6052
2022-05-05 2022-03-31 13F MERCK COM 58933Y105 11,391 49 0.43 935 7.59 0.4326
2022-01-24 2021-12-31 13F MERCK COM 58933Y105 11,342 300 2.72 869 2.00 0.3839
2021-11-10 2021-09-30 13F MERCK COM 58933Y105 11,042 15 0.14 852 -0.70 0.3976
2021-07-29 2021-06-30 13F MERCK COM 58933Y105 11,027 -10 -0.09 858 1.42 0.4175
2021-04-22 2021-03-31 13F MERCK COM 58933Y105 11,037 -3,014 -21.45 846 -26.37 0.4231
2021-02-01 2020-12-31 13F MERCK COM 58933Y105 14,051 -1,096 -7.24 1,149 -8.52 0.6783
2020-10-15 2020-09-30 13F MERCK COM 58933Y105 15,147 -436 -2.80 1,256 4.23 0.8216
2020-07-28 2020-06-30 13F MERCK COM 58933Y105 15,583 15,583 1,205 0.8594
2020-04-13 2020-03-31 13F MERCK COM 58933Y105 0 -17,888 -100.00 0 -100.00
2020-01-27 2019-12-31 13F MERCK COM 58933Y105 17,888 -417 -2.28 1,627 5.58 1.0735
2019-10-15 2019-09-30 13F MERCK COM 58933Y105 18,305 -245 -1.32 1,541 -0.90 1.0656
2019-07-22 2019-06-30 13F MERCK COM 58933Y105 18,550 116 0.63 1,555 1.44 1.0447
2019-04-24 2019-03-31 13F MERCK COM 58933Y105 18,434 4,698 34.20 1,533 49.85 1.0718
2019-02-04 2018-12-31 13F MERCK COM 58933Y105 13,736 13,736 1,023 0.8698
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.