Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionHallmark Capital Management Inc
Latest Disclosed Ownership47,344 shares
Latest Disclosed Value $ 5,694,989
Hallmark Capital Management Inc reports 4.28% decrease in ownership of MRK / Merck & Co., Inc.

On May 6, 2026 - Hallmark Capital Management Inc filed a 13F-HR form disclosing ownership of 47,344 shares of Merck & Co., Inc. (MX:MRK) valued at $5,694,989 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 49,461 shares of Merck & Co., Inc.. This represents a change in shares of -4.28% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-06 2026-03-31 13F MERCK & CO INC COM Stock 58933Y105 47,344 -2,117 -4.28 5,695 9.37 0.3667
2026-02-04 2025-12-31 13F MERCK & CO INC COM Stock 58933Y105 49,461 -90 -0.18 5,206 25.20 0.3336
2025-11-03 2025-09-30 13F MERCK & CO INC COM Stock 58933Y105 49,551 1,394 2.89 4,159 9.08 0.2749
2025-08-06 2025-06-30 13F MERCK & CO INC COM Stock 58933Y105 48,157 -1,678 -3.37 3,812 -14.78 0.2741
2025-05-07 2025-03-31 13F MERCK & CO INC COM Stock 58933Y105 49,835 10,601 27.02 4,473 14.63 0.3393
2025-01-31 2024-12-31 13F MERCK & CO INC COM Stock 58933Y105 39,234 -2,255 -5.44 3,903 -17.17 0.2917
2024-11-06 2024-09-30 13F MERCK & CO INC COM Stock 58933Y105 41,489 78 0.19 4,712 -8.10 0.3491
2024-08-08 2024-06-30 13F MERCK & CO INC COM Stock 58933Y105 41,411 -2,891 -6.53 5,127 -12.30 0.4084
2024-05-03 2024-03-31 13F MERCK & CO INC COM Stock 58933Y105 44,302 -2,627 -5.60 5,846 14.25 0.4405
2024-02-07 2023-12-31 13F MERCK & CO INC COM Stock 58933Y105 46,929 -848 -1.77 5,116 4.03 0.3990
2023-11-09 2023-09-30 13F MERCK & CO INC COM Stock 58933Y105 47,777 -1,165 -2.38 4,919 -12.91 0.4100
2023-07-28 2023-06-30 13F MERCK & CO INC COM Stock 58933Y105 48,942 -5,031 -9.32 5,647 -1.65 0.5072
2023-05-03 2023-03-31 13F MERCK & CO INC COM Stock 58933Y105 53,973 -2,165 -3.86 5,742 -7.80 0.5223
2023-02-01 2022-12-31 13F MERCK & CO INC COM Stock 58933Y105 56,138 -2,386 -4.08 6,228 23.57 0.5783
2022-11-09 2022-09-30 13F MERCK & CO INC COM Stock 58933Y105 58,524 -3,218 -5.21 5,040 -10.46 0.5031
2022-11-16 2022-06-30 13F/A-3 MERCK & CO INC COM Stock 58933Y105 61,742 -3,636 -5.56 5,629 4.94 0.5270
2022-08-01 2022-06-30 13F MERCK & CO INC COM Stock 58933Y105 61,742 -3,636 5,629 0.5270
2022-05-02 2022-03-31 13F MERCK COM 58933Y105 65,378 2,823 4.51 5,364 11.87 0.4483
2022-02-02 2021-12-31 13F MERCK COM 58933Y105 62,555 1,019 1.66 4,795 3.74 0.3846
2021-11-01 2021-09-30 13F MERCK COM 58933Y105 61,536 -315 -0.51 4,622 -3.91 0.4030
2021-08-03 2021-06-30 13F MERCK COM 58933Y105 61,851 2,854 4.84 4,810 5.76 0.4068
2021-04-22 2021-03-31 13F MERCK COM 58933Y105 58,997 8,062 15.83 4,548 9.17 0.4086
2021-02-02 2020-12-31 13F MERCK COM 58933Y105 50,935 798 1.59 4,166 0.17 0.4075
2020-11-03 2020-09-30 13F MERCK COM 58933Y105 50,137 -6,858 -12.03 4,159 -5.63 0.4578
2020-07-28 2020-06-30 13F MERCK COM 58933Y105 56,995 940 1.68 4,407 2.20 0.4940
2020-04-24 2020-03-31 13F MERCK COM 58933Y105 56,055 1,061 1.93 4,312 -13.78 0.5599
2020-01-31 2019-12-31 13F MERCK COM 58933Y105 54,994 -353 -0.64 5,001 7.32 0.4999
2019-11-01 2019-09-30 13F MERCK COM 58933Y105 55,347 8,136 17.23 4,660 17.71 0.4948
2019-08-08 2019-06-30 13F MERCK COM 58933Y105 47,211 4,668 10.97 3,959 11.87 0.4202
2019-05-09 2019-03-31 13F MERCK COM 58933Y105 42,543 -1,246 -2.85 3,539 5.77 0.3860
2019-02-08 2018-12-31 13F MERCK COM 58933Y105 43,789 5,688 14.93 3,346 23.79 0.4372
2018-10-26 2018-09-30 13F MERCK COM 58933Y105 38,101 2,236 6.23 2,703 24.16 0.3194
2018-08-02 2018-06-30 13F MERCK COM 58933Y105 35,865 -1,640 -4.37 2,177 6.56 0.2658
2018-04-27 2018-03-31 13F MERCK COM 58933Y105 37,505 1,133 3.12 2,043 -0.20 0.2485
2018-01-24 2017-12-31 13F MERCK COM 58933Y105 36,372 -610 -1.65 2,047 -13.56 0.2462
2017-10-30 2017-09-30 13F MERCK COM 58933Y105 36,982 -4,530 -10.91 2,368 -11.01 0.2977
2017-07-13 2017-06-30 13F MERCK COM 58933Y105 41,512 -8,836 -17.55 2,661 -16.82 0.3566
2017-05-12 2017-03-31 13F Merck COM 58933Y105 50,348 1,156 2.35 3,199 10.46 0.4247
2017-02-13 2016-12-31 13F MERCK COM 58933Y105 49,192 -285 -0.58 2,896 -6.25 0.4141
2016-11-09 2016-09-30 13F Merck COM 58933Y105 49,477 3,287 7.12 3,089 16.08 0.4540
2016-08-05 2016-06-30 13F Merck COM 58933Y105 46,190 16,841 57.38 2,661 71.35 0.4056
2016-05-06 2016-03-31 13F MERCK COM 58933Y105 29,349 8,248 39.09 1,553 39.28 0.2623
2016-02-05 2015-12-31 13F MERCK COM 58933Y105 21,101 -18 -0.09 1,115 6.90 0.2000
2015-10-30 2015-09-30 13F MERCK COM 58933Y105 21,119 -1,385 -6.15 1,043 -18.58 0.1898
2015-07-30 2015-06-30 13F MERCK COM 58933Y105 22,504 -1,690 -6.99 1,281 -7.91 0.2227
2015-05-06 2015-03-31 13F MERCK COM 58933Y105 24,194 1,268 5.53 1,391 6.84 0.2395
2015-02-06 2014-12-31 13F MERCK COM 58933Y105 22,926 1,191 5.48 1,302 1.09 0.2327
2014-11-05 2014-09-30 13F MERCK COM 58933Y105 21,735 835 4.00 1,288 6.53 0.2466
2014-08-04 2014-06-30 13F MERCK COM 58933Y105 20,900 1,565 8.09 1,209 10.11 0.2297
2014-05-07 2014-03-31 13F MERCK COM 58933Y105 19,335 610 3.26 1,098 17.18 0.2193
2014-02-07 2013-12-31 13F MERCK COM 58933Y105 18,725 18,725 937 0.1924
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.