Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionStanley-Laman Group, Ltd.
Latest Disclosed Ownership5,916 shares
Latest Disclosed Value $ 711,636
Stanley-Laman Group, Ltd. reports 27.24% decrease in ownership of MRK / Merck & Co., Inc.

On April 16, 2026 - Stanley-Laman Group, Ltd. filed a 13F-HR form disclosing ownership of 5,916 shares of Merck & Co., Inc. (MX:MRK) valued at $711,636 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 8,131 shares of Merck & Co., Inc.. This represents a change in shares of -27.24% 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)
2026-04-16 2026-03-31 13F MERCK COM 58933Y105 5,916 -2,215 -27.24 712 -16.84 0.0861
2026-01-23 2025-12-31 13F MERCK COM 58933Y105 8,131 5,413 199.15 856 275.00 0.1088
2025-10-22 2025-09-30 13F MERCK COM 58933Y105 2,718 -1,012 -27.13 228 -22.71 0.0325
2025-07-29 2025-06-30 13F MERCK COM 58933Y105 3,730 -3,084 -45.26 295 -51.72 0.0439
2025-04-16 2025-03-31 13F MERCK COM 58933Y105 6,814 2,833 71.16 612 54.29 0.0941
2025-01-29 2024-12-31 13F MERCK COM 58933Y105 3,981 -2,043 -33.91 396 -42.11 0.0556
2024-10-22 2024-09-30 13F MERCK COM 58933Y105 6,024 979 19.41 684 9.62 0.0960
2024-07-18 2024-06-30 13F MERCK COM 58933Y105 5,045 1,367 37.17 625 28.66 0.0898
2024-04-17 2024-03-31 13F MERCK COM 58933Y105 3,678 0 0.00 485 21.25 0.0680
2024-02-02 2023-12-31 13F MERCK COM 58933Y105 3,678 219 6.33 401 12.36 0.0613
2023-10-16 2023-09-30 13F MERCK COM 58933Y105 3,459 3 0.09 356 -10.55 0.0608
2023-08-08 2023-06-30 13F MERCK COM 58933Y105 3,456 7 0.20 399 8.74 0.0659
2023-04-18 2023-03-31 13F MERCK COM 58933Y105 3,449 3,449 367 0.0653
2021-05-05 2021-03-31 13F MERCK COM 58933Y105 0 -20,540 -100.00 0 -100.00
2021-02-09 2020-12-31 13F MERCK COM 58933Y105 20,540 4,293 26.42 1,680 24.63 0.2976
2020-10-20 2020-09-30 13F MERCK COM 58933Y105 16,247 -1,544 -8.68 1,348 -2.03 0.2974
2020-07-20 2020-06-30 13F MERCK AND COM 58933Y105 17,791 719 4.21 1,376 4.72 0.3309
2020-05-12 2020-03-31 13F MERCK COM 58933Y105 17,072 2,534 17.43 1,314 -0.61 0.3988
2020-02-04 2019-12-31 13F MERCK COM 58933Y105 14,538 -646 -4.25 1,322 3.44 0.3119
2019-11-08 2019-09-30 13F MERCK COM 58933Y105 15,184 -1,318 -7.99 1,278 -7.66 0.3155
2019-08-01 2019-06-30 13F MERCK COM 58933Y105 16,502 959 6.17 1,384 7.04 0.3320
2019-05-10 2019-03-31 13F MERCK COM 58933Y105 15,543 506 3.37 1,293 12.53 0.3140
2019-02-07 2018-12-31 13F MERCK COM 58933Y105 15,037 -489 -3.15 1,149 4.36 0.3191
2018-10-30 2018-09-30 13F MERCK COM 58933Y105 15,526 -7,644 -32.99 1,101 -21.69 0.2705
2018-08-09 2018-06-30 13F MERCK COM 58933Y105 23,170 3,136 15.65 1,406 28.87 0.3158
2018-05-01 2018-03-31 13F MERCK COM 58933Y105 20,034 149 0.75 1,091 -2.50 0.2485
2018-02-09 2017-12-31 13F MERCK COM 58933Y105 19,885 11,058 125.27 1,119 98.05 0.2416
2017-11-13 2017-09-30 13F MERCK COM 58933Y105 8,827 -880 -9.07 565 -9.16 0.1508
2017-08-07 2017-06-30 13F MERCK COM 58933Y105 9,707 0 0.00 622 0.81 0.1687
2017-05-12 2017-03-31 13F MERCK COM 58933Y105 9,707 -6,606 -40.50 617 -35.73 0.1672
2017-02-06 2016-12-31 13F MERCK COM 58933Y105 16,313 -5,315 -24.57 960 -28.89 0.2972
2016-10-28 2016-09-30 13F MERCK COM 58933Y105 21,628 -9,383 -30.26 1,350 -24.45 0.5525
2016-08-03 2016-06-30 13F MERCK COM 58933Y105 31,011 -30,262 -49.39 1,787 -44.88 0.6986
2016-05-09 2016-03-31 13F MERCK COM 58933Y105 61,273 -1,463 -2.33 3,242 -2.17 0.6095
2016-01-26 2015-12-31 13F MERCK COM 58933Y105 62,736 286 0.46 3,314 7.46 0.5675
2015-11-03 2015-09-30 13F MERCK COM 58933Y105 62,450 0 0.00 3,084 -13.25 0.6276
2015-07-28 2015-06-30 13F MERCK COM 58933Y105 62,450 -100 -0.16 3,555 -1.11 0.6515
2015-05-08 2015-03-31 13F MERCK & CO INC COM 58933Y105 62,550 62,550 0.00 3,595 0.6576
2015-01-30 2014-12-31 13F MERCK & CO INC COM 58933Y105 0 -58,445 -100.00 0 -100.00
2014-11-14 2014-09-30 13F MERCK & CO INC COM 58933Y105 58,445 565 0.98 3,465 3.49 0.6732
2014-07-02 2014-06-30 13F MERCK & CO INC COM 58933Y105 57,880 -891 -1.52 3,348 0.36 0.6145
2014-04-11 2014-03-31 13F MERCK & CO INC COM 58933Y105 58,771 58,771 3,336 0.5828
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.