Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionAdalta Capital Management LLC
Latest Disclosed Ownership88,591 shares
Latest Disclosed Value $ 10,732,499
Adalta Capital Management LLC reports 1.10% decrease in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - Adalta Capital Management LLC filed a 13F-HR form disclosing ownership of 88,591 shares of Merck & Co., Inc. (MX:MRK) valued at $10,732,499 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 14, 2026 disclosing 89,580 shares of Merck & Co., Inc.. This represents a change in shares of -1.10% 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)
2026-05-15 2026-03-31 13F Merck COM 58933Y105 88,591 -989 -1.10 10,732 12.91 3.1891
2026-02-14 2025-12-31 13F Merck COM 58933Y105 89,580 -600 -0.67 9,505 24.39 4.2434
2025-11-17 2025-09-30 13F Merck COM 58933Y105 90,180 0 0.00 7,642 5.96 3.4692
2025-08-12 2025-06-30 13F Merck COM 58933Y105 90,180 19 0.02 7,212 -11.68 3.6190
2025-05-16 2025-03-31 13F Merck COM 58933Y105 90,161 36 0.04 8,166 -9.66 4.3482
2025-02-18 2024-12-31 13F Merck COM 58933Y105 90,125 0 0.00 9,039 -12.28 4.7191
2024-11-15 2024-09-30 13F Merck COM 58933Y105 90,125 -58 -0.06 10,304 -8.29 5.3149
2024-08-15 2024-06-30 13F Merck COM 58933Y105 90,183 -77 -0.09 11,234 -6.22 6.1084
2024-05-16 2024-03-31 13F Merck COM 58933Y105 90,260 1,180 1.32 11,979 22.48 6.6160
2024-02-14 2023-12-31 13F Merck COM 58933Y105 89,080 -120 -0.13 9,780 108,566.67 5.9137
2023-11-15 2023-09-30 13F Merck COM 58933Y105 89,200 156 0.18 9 -10.00 6.3026
2023-08-24 2023-06-30 13F Merck COM 58933Y105 89,044 0 0.00 10 11.11 6.9106
2023-05-16 2023-03-31 13F Merck COM 58933Y105 89,044 34 0.04 10 0.00 6.6701
2023-02-21 2022-12-31 13F Merck COM 58933Y105 89,010 -200 -0.22 10 -99.88 7.0112
2022-11-15 2022-09-30 13F Merck COM 58933Y105 89,210 0 0.00 7,744 -5.49 5.5629
2022-08-18 2022-06-30 13F Merck COM 58933Y105 89,210 -25 -0.03 8,194 11.06 5.3214
2022-06-15 2022-03-31 13F Merck COM 58933Y105 89,235 0 0.00 7,378 7.04 3.6805
2022-02-15 2021-12-31 13F Merck COM 58933Y105 89,235 13,125 17.24 6,893 19.55 3.1786
2021-11-16 2021-09-30 13F Merck COM 58933Y105 76,110 -40 -0.05 5,766 -3.45 3.1913
2021-08-17 2021-06-30 13F Merck COM 58933Y105 76,150 50 0.07 5,972 0.95 3.2519
2021-05-18 2021-03-31 13F Merck COM 58933Y105 76,100 -925 -1.20 5,916 -6.85 3.4128
2021-02-17 2020-12-31 13F Merck COM 58933Y105 77,025 375 0.49 6,351 -0.84 4.0077
2020-11-17 2020-09-30 13F Merck COM 58933Y105 76,650 75 0.10 6,405 7.32 4.6733
2020-08-14 2020-06-30 13F Merck COM 58933Y105 76,575 -630 -0.82 5,968 -0.32 4.7545
2020-05-18 2020-03-31 13F Merck COM 58933Y105 77,205 -2,565 -3.22 5,987 -18.03 5.4365
2020-02-14 2019-12-31 13F Merck COM 58933Y105 79,770 -500 -0.62 7,304 7.40 4.5950
2019-11-15 2019-09-30 13F Merck COM 58933Y105 80,270 125 0.16 6,801 0.55 4.5053
2019-08-14 2019-06-30 13F Merck COM 58933Y105 80,145 4,050 5.32 6,764 6.17 4.4453
2019-05-16 2019-03-31 13F Merck COM 58933Y105 76,095 900 1.20 6,371 10.09 4.8194
2019-02-15 2018-12-31 13F Merck COM 58933Y105 75,195 -1,000 -1.31 5,787 6.34 5.4051
2018-11-14 2018-09-30 13F Merck COM 58933Y105 76,195 0 0.00 5,442 16.76 3.8841
2018-08-14 2018-06-30 13F Merck COM 58933Y105 76,195 -275 -0.36 4,661 10.92 3.2926
2018-05-16 2018-03-31 13F Merck COM 58933Y105 76,470 105 0.14 4,202 -3.05 3.2080
2018-02-14 2017-12-31 13F Merck COM 58933Y105 76,365 -1,800 -2.30 4,334 -14.04 3.2996
2017-11-24 2017-09-30 13F Merck COM 58933Y105 78,165 -600 -0.76 5,042 -0.85 4.1162
2017-08-16 2017-06-30 13F Merck COM 58933Y105 78,765 3,100 4.10 5,085 4.98 4.1033
2017-05-17 2017-03-31 13F Merck COM 58933Y105 75,665 75,665 4,844 4.0983
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.