Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionHall Laurie J Trustee
Latest Disclosed Ownership12,164 shares
Latest Disclosed Value $ 1,463,208
Hall Laurie J Trustee reports 6.82% decrease in ownership of MRK / Merck & Co., Inc.

On April 6, 2026 - Hall Laurie J Trustee filed a 13F-HR form disclosing ownership of 12,164 shares of Merck & Co., Inc. (MX:MRK) valued at $1,463,208 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 13,054 shares of Merck & Co., Inc.. This represents a change in shares of -6.82% 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)
2026-04-06 2026-03-31 13F MERCK AND Equities 58933Y105 12,164 -890 -6.82 1,463 6.48 0.5164
2026-01-20 2025-12-31 13F MERCK AND Equities 58933Y105 13,054 -2,701 -17.14 1,374 3.93 0.4566
2025-10-14 2025-09-30 13F MERCK AND Equities 58933Y105 15,755 -2,829 -15.22 1,322 -10.13 0.4320
2025-07-15 2025-06-30 13F MERCK AND Equities 58933Y105 18,584 -3,520 -15.92 1,471 -25.86 0.4864
2025-05-15 2025-03-31 13F MERCK AND Equities 58933Y105 22,104 -1,350 -5.76 1,984 99,100.00 0.7078
2025-01-16 2024-12-31 13F MERCK AND COM 58933Y105 23,454 -630 -2.62 2 0.00 0.7661
2024-10-08 2024-09-30 13F MERCK AND COM 58933Y105 24,084 -200 -0.82 3 -33.33 0.8666
2024-07-22 2024-06-30 13F MERCK AND COM 58933Y105 24,284 -2,075 -7.87 3 0.00 1.0465
2024-04-23 2024-03-31 13F MERCK AND COM 58933Y105 26,359 -2,641 -9.11 3 0.00 1.2246
2024-01-11 2023-12-31 13F MERCK AND COM 58933Y105 29,000 -675 -2.27 3 0.00 1.2115
2023-10-12 2023-09-30 13F MERCK AND COM 58933Y105 29,675 100 0.34 3 0.00 1.3007
2023-07-14 2023-06-30 13F MERCK AND COM 58933Y105 29,575 0 0.00 3 0.00 1.3543
2023-04-07 2023-03-31 13F MERCK AND COM 58933Y105 29,575 650 2.25 3 0.00 1.3419
2023-01-11 2022-12-31 13F MERCK AND COM 58933Y105 28,925 -50 -0.17 3 -99.88 1.4453
2022-10-11 2022-09-30 13F MERCK AND COM 58933Y105 28,975 -125 -0.43 2,495 -5.96 1.2295
2022-07-06 2022-06-30 13F MERCK AND COM 58933Y105 29,100 -100 -0.34 2,653 10.73 1.2404
2022-04-06 2022-03-31 13F MERCK AND COM 58933Y105 29,200 0 0.00 2,396 7.06 0.9208
2022-01-05 2021-12-31 13F MERCK AND COM 58933Y105 29,200 0 0.00 2,238 2.05 0.7927
2021-10-04 2021-09-30 13F MERCK AND COM 58933Y105 29,200 0 0.00 2,193 -3.39 0.8468
2021-07-07 2021-06-30 13F MERCK AND COM 58933Y105 29,200 0 0.00 2,270 0.80 0.8564
2021-04-15 2021-03-31 13F MERCK AND COM 58933Y105 29,200 -1,650 -5.35 2,252 -10.78 0.8646
2021-01-25 2020-12-31 13F MERCK AND COM 58933Y105 30,850 -2,600 -7.77 2,524 -9.05 1.0221
2020-10-09 2020-09-30 13F MERCK AND COM 58933Y105 33,450 -234 -0.69 2,775 -9.43 1.2409
2020-02-12 2019-12-31 13F MERCK AND COM 58933Y105 33,684 -720 -2.09 3,064 5.80 1.4138
2019-10-25 2019-09-30 13F MERCK AND COM 58933Y105 34,404 -275 -0.79 2,896 -0.41 1.4767
2019-08-01 2019-06-30 13F MERCK AND COM 58933Y105 34,679 0 0.00 2,908 0.83 1.5097
2019-05-02 2019-03-31 13F MERCK AND COM 58933Y105 34,679 0 0.00 2,884 5.91 1.5191
2019-02-14 2018-12-31 13F MERCK AND COM 58933Y105 34,679 0 0.00 2,723 10.65 1.5011
2018-10-30 2018-09-30 13F MERCK AND COM 58933Y105 34,679 150 0.43 2,461 17.41 1.2970
2018-08-01 2018-06-30 13F MERCK AND COM 58933Y105 34,529 0 0.00 2,096 11.43 1.2041
2018-05-10 2018-03-31 13F MERCK AND COM 58933Y105 34,529 -150 -0.43 1,881 -3.59 1.1460
2018-01-30 2017-12-31 13F MERCK AND COM 58933Y105 34,679 450 1.31 1,951 -10.95 1.1115
2017-10-02 2017-09-30 13F MERCK AND COM 58933Y105 34,229 -100 -0.29 2,192 -0.41 1.3642
2017-08-22 2017-06-30 13F MERCK AND COM 58933Y105 34,329 -50 -0.15 2,200 0.69 1.4060
2017-04-13 2017-03-31 13F MERCK AND COM 58933Y105 34,379 0 0.00 2,185 5.45 1.3909
2017-01-10 2016-12-31 13F MERCK AND COM 58933Y105 34,379 -438 -1.26 2,072 0.29 1.3225
2016-07-12 2016-06-30 13F MERCK AND COM 58933Y105 34,817 190 0.55 2,066 5.14 1.3466
2016-04-28 2016-03-31 13F MERCK AND COM 58933Y105 34,627 -200 -0.57 1,965 13.32 1.2376
2016-02-19 2015-12-31 13F MERCK AND COM 58933Y105 34,827 144 0.42 1,734 1.23 1.2490
2015-10-26 2015-09-30 13F MERCK COMMON STOCK 58933Y105 34,683 500 1.46 1,713 -11.97 1.3682
2015-07-16 2015-06-30 13F MERCK COMMON STOCK 58933Y105 34,183 0 0.00 1,946 -0.97 1.4170
2015-04-24 2015-03-31 13F MERCK COMMON STOCK 58933Y105 34,183 34,183 0.00 1,965 1.4321
2015-02-03 2014-12-31 13F MERCK COMMON STOCK 58933Y105 0 -31,547 -100.00 0 -100.00
2014-11-10 2014-09-30 13F MERCK COMMON STOCK 58933Y105 31,547 0 0.00 1,870 2.47 1.4057
2014-07-21 2014-06-30 13F MERCK COMMON STOCK 58933Y105 31,547 300 0.96 1,825 2.87 1.3712
2014-04-23 2014-03-31 13F/A-1 MERCK COMMON STOCK 58933Y105 31,247 0 0.00 1,774 13.43 1.3717
2014-04-22 2014-03-31 13F MERCK COMMON STOCK 58933Y105 31,247 1,564
2014-02-21 2013-12-31 13F MERCK COMMON STOCK 58933Y105 31,247 0 0.00 1,564 5.11 1.2026
2013-10-15 2013-09-30 13F MERCK COMMON STOCK 58933Y105 31,247 1,520 5.11 1,488 7.75 1.2536
2013-08-15 2013-06-30 13F MERCK COMMON STOCK 58933Y105 29,727 29,727 1,381 1.2208
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.