Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionField & Main Bank
Latest Disclosed Ownership18,788 shares
Latest Disclosed Value $ 2,260,009
Field & Main Bank reports 0.48% decrease in ownership of MRK / Merck & Co., Inc.

On April 10, 2026 - Field & Main Bank filed a 13F-HR form disclosing ownership of 18,788 shares of Merck & Co., Inc. (MX:MRK) valued at $2,260,009 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 18,878 shares of Merck & Co., Inc.. This represents a change in shares of -0.48% 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)
2026-04-10 2026-03-31 13F Merck Com 58933Y105 18,788 -90 -0.48 2,260 13.74 0.3799
2026-01-28 2025-12-31 13F Merck Com 58933Y105 18,878 195 1.04 1,987 26.72 0.5726
2025-11-03 2025-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 18,683 230 1.25 1,568 7.40 0.4631
2025-08-04 2025-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 18,453 -95 -0.51 1,461 -12.26 0.4751
2025-04-23 2025-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 18,548 -330 -1.75 1,665 -11.35 0.5879
2025-01-23 2024-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 18,878 785 4.34 1,878 -8.62 0.6606
2024-11-01 2024-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 18,093 225 1.26 2,055 -7.14 0.7321
2024-07-25 2024-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 17,868 269 1.53 2,212 -4.74 0.8284
2024-04-29 2024-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 17,599 -184 -1.03 2,322 19.81 0.9021
2024-02-05 2023-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 17,783 -135 -0.75 1,939 5.10 0.8199
2023-10-12 2023-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 17,918 5,910 49.22 1,845 33.14 0.8639
2023-07-26 2023-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 12,008 -240 -1.96 1,386 6.29 0.7722
2023-04-19 2023-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 12,248 100 0.82 1,303 -3.27 0.7772
2023-01-19 2022-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 12,148 175 1.46 1,348 30.65 0.8689
2022-10-25 2022-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 11,973 336 2.89 1,031 -2.83 0.6923
2022-07-18 2022-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 11,637 2,482 27.11 1,061 41.28 0.6829
2022-04-21 2022-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 9,155 225 2.52 751 9.80 0.4545
2022-02-01 2021-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 8,930 35 0.39 684 2.40 0.3944
2021-10-14 2021-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 8,895 -340 -3.68 668 -6.96 0.4393
2021-07-15 2021-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 9,235 795 9.42 718 10.29 0.4600
2021-04-30 2021-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 8,440 735 9.54 651 3.33 0.4670
2021-02-25 2020-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 7,705 -485 -5.92 630 -7.22 0.4688
2020-10-22 2020-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 8,190 -325 -3.82 679 3.19 0.5246
2020-08-12 2020-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 8,515 1,400 19.68 658 1.70 0.5606
2020-02-05 2019-12-31 13F/A-1 MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 7,115 710 11.09 647 20.04 0.5375
2020-02-03 2019-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 7,115 710 647 394,098.8719
2019-11-07 2019-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 6,405 3,720 138.55 539 139.56 0.4861
2019-07-22 2019-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 2,685 435 19.33 225 20.32 0.2065
2019-04-24 2019-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 2,250 1,025 83.67 187 114.94 0.1764
2018-10-23 2018-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 1,225 0 0.00 87 7.41 0.0777
2018-08-13 2018-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 1,225 350 40.00 81 68.75 0.0738
2018-05-01 2018-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 875 0 0.00 48 -2.04 0.0468
2018-01-24 2017-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 875 -516 -37.10 49 -37.97 0.0470
2015-07-22 2015-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 1,391 -150 -9.73 79 -11.24 0.0750
2015-04-30 2015-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 1,541 1,541 0.00 89 0.0823
2015-02-03 2014-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 0 -1,341 -100.00 0 -100.00
2014-10-14 2014-09-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 1,341 -250 -15.71 79 -14.13 0.0743
2014-08-11 2014-06-30 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 1,591 0 0.00 92 2.22 0.0860
2014-04-17 2014-03-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 1,591 -50 -3.05 90 9.76 0.0870
2014-02-13 2013-12-31 13F MERCK & CO INC COMMON STOCK - LARGE CAP 58933Y105 1,641 1,641 82 0.0799
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.