Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionWisconsin Capital Management Llc
Latest Disclosed Ownership14,510 shares
Latest Disclosed Value $ 1,745,408
Wisconsin Capital Management Llc reports 6.71% decrease in ownership of MRK / Merck & Co., Inc.

On May 12, 2026 - Wisconsin Capital Management Llc filed a 13F-HR form disclosing ownership of 14,510 shares of Merck & Co., Inc. (MX:MRK) valued at $1,745,408 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 15,554 shares of Merck & Co., Inc.. This represents a change in shares of -6.71% 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)
2026-05-12 2026-03-31 13F MERCK COM 58933Y105 14,510 -1,044 -6.71 1,745 6.60 0.9580
2026-02-06 2025-12-31 13F MERCK COM 58933Y105 15,554 944 6.46 1,637 33.52 0.8276
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 14,610 -225 -1.52 1,226 4.43 0.6259
2025-08-07 2025-06-30 13F MERCK COM 58933Y105 14,835 0 0.00 1,174 -11.80 0.6486
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 14,835 -550 -3.57 1,332 -13.01 0.8486
2025-02-12 2024-12-31 13F MERCK COM 58933Y105 15,385 -1,369 -8.17 1,530 -19.56 0.8415
2024-10-30 2024-09-30 13F MERCK COM 58933Y105 16,754 500 3.08 1,903 -5.47 0.9989
2024-08-01 2024-06-30 13F MERCK COM 58933Y105 16,254 0 0.00 2,012 -6.16 1.0196
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 16,254 -200 -1.22 2,145 19.58 1.1257
2024-02-02 2023-12-31 13F MERCK COM 58933Y105 16,454 -3,250 -16.49 1,794 -11.59 1.0656
2023-11-01 2023-09-30 13F MERCK COM 58933Y105 19,704 -9,945 -33.54 2,029 -40.72 1.3393
2023-08-10 2023-06-30 13F MERCK COM 58933Y105 29,649 -2,800 -8.63 3,421 -0.90 2.2153
2023-04-28 2023-03-31 13F MERCK COM 58933Y105 32,449 -14,185 -30.42 3,452 -33.28 2.3529
2023-02-15 2022-12-31 13F MERCK COM 58933Y105 46,634 -750 -1.58 5,174 26.78 3.9281
2022-11-15 2022-09-30 13F MERCK COM 58933Y105 47,384 -1,169 -2.41 4,081 -7.82 3.1930
2022-08-01 2022-06-30 13F MERCK COM 58933Y105 48,553 -9,581 -16.48 4,427 -7.19 2.9735
2022-05-12 2022-03-31 13F MERCK COM 58933Y105 58,134 -8,000 -12.10 4,770 -5.90 2.3019
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 66,134 6,575 11.04 5,069 13.32 2.0846
2021-11-01 2021-09-30 13F MERCK COM 58933Y105 59,559 54,841 1,162.38 4,473 1,118.80 1.8347
2021-07-22 2021-06-30 13F MERCK COM 58933Y105 4,718 -100 -2.08 367 -1.08 0.1437
2021-05-03 2021-03-31 13F MERCK & CO. COM 58933Y105 4,818 -238 -4.71 371 -10.39 0.1531
2021-02-10 2020-12-31 13F MERCK & CO. COM 58933Y105 5,056 1,056 26.40 414 24.70 0.1597
2020-11-04 2020-09-30 13F MERCK & CO. COM 58933Y105 4,000 0 0.00 332 7.44 0.1532
2020-08-10 2020-06-30 13F MERCK & CO. COM 58933Y105 4,000 0 0.00 309 0.32 0.1559
2020-05-11 2020-03-31 13F MERCK & CO. COM 58933Y105 4,000 0 0.00 308 -15.38 0.2020
2020-02-10 2019-12-31 13F MERCK COM 58933Y105 4,000 0 0.00 364 8.01 0.1781
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 4,000 0 0.00 337 0.60 0.1791
2019-08-12 2019-06-30 13F MERCK COM 58933Y105 4,000 4,000 335 0.1797
2019-02-12 2018-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 0 -39,890 -100.00 0 -100.00
2015-02-11 2014-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 39,890 -200 -0.50 2,265 -4.71 0.8056
2014-11-12 2014-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 40,090 -275 -0.68 2,377 1.80 0.8796
2014-08-13 2014-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 40,365 125 0.31 2,335 2.23 0.8561
2014-05-14 2014-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 40,240 -10,105 -20.07 2,284 -9.37 0.8775
2014-02-11 2013-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 50,345 -25,125 -33.29 2,520 -29.86 0.9918
2013-11-12 2013-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 75,470 -4,320 -5.41 3,593 -3.05 1.5305
2013-08-14 2013-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 79,790 79,790 3,706 1.5715
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.