Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionGame Creek Capital, LP
Latest Disclosed Ownership3,500 shares
Latest Disclosed Value $ 421,015
Game Creek Capital, LP reports 15.15% decrease in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Game Creek Capital, LP filed a 13F-HR form disclosing ownership of 3,500 shares of Merck & Co., Inc. (MX:MRK) valued at $421,015 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 4,125 shares of Merck & Co., Inc.. This represents a change in shares of -15.15% 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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 3,500 -625 -15.15 421 -3.00 0.1400
2026-02-17 2025-12-31 13F MERCK COM 58933Y105 4,125 -250 -5.71 434 18.26 0.1434
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 4,375 -1,875 -30.00 367 -25.71 0.1285
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 6,250 -1,250 -16.67 495 -26.60 0.2119
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 7,500 -500 -6.25 673 -15.35 0.3364
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 8,000 -2,500 -23.81 796 -33.31 0.3108
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 10,500 -625 -5.62 1,192 -13.44 0.5404
2024-08-12 2024-06-30 13F MERCK COM 58933Y105 11,125 -750 -6.32 1,377 -12.07 0.7049
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 11,875 -750 -5.94 1,567 13.81 0.7500
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 12,625 6,625 110.42 1,376 123.01 0.5771
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 6,000 -625 -9.43 618 -19.24 0.3825
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 6,625 -1,125 -14.52 764 -7.28 0.4304
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 7,750 -3,125 -28.74 825 -31.67 0.4627
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 10,875 -1,000 -8.42 1,207 17.89 0.6926
2022-11-04 2022-09-30 13F MERCK COM 58933Y105 11,875 -5,875 -33.10 1,023 -36.77 0.6216
2022-08-09 2022-06-30 13F MERCK COM 58933Y105 17,750 -8,250 -31.73 1,618 -24.14 0.8583
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 26,000 -11,500 -30.67 2,133 -25.78 0.8429
2022-02-09 2021-12-31 13F MERCK COM 58933Y105 37,500 -5,750 -13.29 2,874 -11.54 1.1930
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 43,250 -25,500 -37.09 3,249 -39.24 1.3963
2021-08-11 2021-06-30 13F MERCK COM 58933Y105 68,750 42,750 164.42 5,347 166.82 2.6875
2021-05-11 2021-03-31 13F MERCK & CO. COM 58933Y105 26,000 13,750 112.24 2,004 100.00 1.1236
2021-02-10 2020-12-31 13F MERCK & CO. COM 58933Y105 12,250 12,250 1,002 0.5903
2020-05-11 2020-03-31 13F MERCK COM 58933Y105 0 -3,500 -100.00 0 -100.00
2020-02-11 2019-12-31 13F MERCK COM 58933Y105 3,500 0 0.00 318 7.80 0.1787
2019-10-31 2019-09-30 13F MERCK COM 58933Y105 3,500 -500 -12.50 295 -11.94 0.1421
2019-08-05 2019-06-30 13F MERCK COM 58933Y105 4,000 -890 -18.20 335 -17.69 0.1938
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 4,890 -1,360 -21.76 407 -14.85 0.1980
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 6,250 -1,500 -19.35 478 -13.09 0.2244
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 7,750 -9,500 -55.07 550 -47.47 0.2018
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 17,250 -250 -1.43 1,047 9.86 0.4453
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 17,500 17,500 953 0.4172
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.