Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionWimmer Associates 1, Llc
Latest Disclosed Ownership11,064 shares
Latest Disclosed Value $ 1,330,889
Wimmer Associates 1, Llc reports 7.99% decrease in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - Wimmer Associates 1, Llc filed a 13F-HR form disclosing ownership of 11,064 shares of Merck & Co., Inc. (MX:MRK) valued at $1,330,889 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 12,025 shares of Merck & Co., Inc.. This represents a change in shares of -7.99% 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 11,064 -961 -7.99 1,331 5.14 0.6503
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 12,025 -108 -0.89 1,266 24.26 0.5885
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 12,133 -439 -3.49 1,018 2.31 0.4895
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 12,572 -615 -4.66 995 -1.49 0.5088
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 13,187 -1,015 -7.15 1,011 -28.47 0.5330
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 14,202 -740 -4.95 1,413 -16.75 0.6984
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 14,942 295 2.01 1,697 -6.45 0.8306
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 14,647 -45 -0.31 1,813 -6.45 0.9295
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 14,692 15 0.10 1,939 21.13 1.0194
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 14,677 -385 -2.56 1,600 3.23 0.9025
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 15,062 -270 -1.76 1,551 -12.38 0.9677
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 15,332 0 0.00 1,769 -0.84 1.0643
2023-05-16 2023-03-31 13F MERCK COM 58933Y105 15,332 -1,504 -8.93 1,784 -4.45 1.1394
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 16,836 127 0.76 1,868 10.41 1.2328
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 16,709 417 2.56 1,691 13.87 1.1192
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 16,292 -625 -3.69 1,485 6.99 0.9677
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 16,917 240 1.44 1,388 8.61 0.7716
2022-02-16 2021-12-31 13F MERCK COM 58933Y105 16,677 -575 -3.33 1,278 -1.39 0.6850
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 17,252 -1,305 -7.03 1,296 -10.19 0.7680
2021-08-12 2021-06-30 13F MERCK COM 58933Y105 18,557 535 2.97 1,443 3.89 0.8463
2021-05-14 2021-03-31 13F MERCK COM 58933Y105 18,022 235 1.32 1,389 -4.54 0.7559
2021-02-16 2020-12-31 13F MERCK COM 58933Y105 17,787 448 2.58 1,455 1.18 0.8677
2020-12-03 2020-09-30 13F MERCK COM 58933Y105 17,339 395 2.33 1,438 4.89 0.9685
2020-08-14 2020-06-30 13F MERCK COM 58933Y105 16,944 -1,005 -5.60 1,371 -1.44 1.0663
2020-05-15 2020-03-31 13F MERCK COM 58933Y105 17,949 2,135 13.50 1,391 -3.27 1.2942
2020-02-13 2019-12-31 13F Merck COM 58933Y105 15,814 296 1.91 1,438 10.11 1.1517
2019-11-14 2019-09-30 13F Merck COM 58933Y105 15,518 4,412 39.73 1,306 40.28 1.1392
2019-08-14 2019-06-30 13F Merck COM 58933Y105 11,106 -80 -0.72 931 0.11 0.8138
2019-05-15 2019-03-31 13F Merck COM 58933Y105 11,186 0 0.00 930 8.77 0.8247
2019-02-14 2018-12-31 13F Merck COM 58933Y105 11,186 310 2.85 855 10.75 0.8467
2018-11-13 2018-09-30 13F Merck COM 58933Y105 10,876 275 2.59 772 20.06 0.6425
2018-08-14 2018-06-30 13F Merck COM 58933Y105 10,601 3,090 41.14 643 57.21 0.5733
2018-05-10 2018-03-31 13F Merck COM 58933Y105 7,511 1,421 23.33 409 19.24 0.3606
2018-02-14 2017-12-31 13F Merck COM 58933Y105 6,090 431 7.62 343 -5.25 0.3088
2017-11-14 2017-09-30 13F Merck COM 58933Y105 5,659 167 3.04 362 2.84 0.3336
2017-08-11 2017-06-30 13F Merck COM 58933Y105 5,492 -626 -10.23 352 -9.51 0.3243
2017-05-09 2017-03-31 13F Merck COM 58933Y105 6,118 -782 -11.33 389 -4.19 0.3638
2017-02-14 2016-12-31 13F Merck COM 58933Y105 6,900 1,309 23.41 406 16.33 0.3762
2016-11-10 2016-09-30 13F Merck COM 58933Y105 5,591 0 0.00 349 8.39 0.3141
2016-08-11 2016-06-30 13F Merck COM 58933Y105 5,591 688 14.03 322 24.32 0.2873
2016-05-16 2016-03-31 13F Merck COM 58933Y105 4,903 4,903 259 0.2373
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.