Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionHolderness Investments Co
Latest Disclosed Ownership33,090 shares
Latest Disclosed Value $ 3,980,363
Holderness Investments Co reports 2.50% increase in ownership of MRK / Merck & Co., Inc.

On May 12, 2026 - Holderness Investments Co filed a 13F-HR form disclosing ownership of 33,090 shares of Merck & Co., Inc. (MX:MRK) valued at $3,980,363 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 32,282 shares of Merck & Co., Inc.. This represents a change in shares of 2.50% 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 33,090 808 2.50 3,980 17.13 0.7994
2026-02-10 2025-12-31 13F MERCK COM 58933Y105 32,282 -622 -1.89 3,398 23.07 0.6911
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 32,904 -2,367 -6.71 2,762 -1.11 0.5637
2025-08-12 2025-06-30 13F MERCK COM 58933Y105 35,271 -9,746 -21.65 2,792 -30.89 0.6005
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 45,017 -213 -0.47 4,041 -10.20 0.9421
2025-02-11 2024-12-31 13F MERCK COM 58933Y105 45,230 -1,754 -3.73 4,500 -15.67 0.9923
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 46,984 24 0.05 5,336 -8.22 1.1650
2024-08-13 2024-06-30 13F/A-1 MERCK COM 58933Y105 46,960 -191 -0.41 5,814 -6.56 1.3716
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 46,960 -191 5,814 1.3716
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 47,151 -73 -0.15 6,222 20.84 1.5209
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 47,224 11,022 30.45 5,148 38.16 1.4134
2023-11-15 2023-09-30 13F MERCK COM 58933Y105 36,202 -282 -0.77 3,727 -11.48 1.4502
2023-08-15 2023-06-30 13F MERCK COM 58933Y105 36,484 1,368 3.90 4,210 12.69 1.5552
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 35,116 586 1.70 3,736 -2.51 1.4934
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 34,530 -469 -1.34 3,831 27.11 1.6514
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 34,999 -389 -1.10 3,014 -6.57 1.3698
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 35,388 -668 -1.85 3,226 9.06 1.3465
2022-05-12 2022-03-31 13F MERCK COM 58933Y105 36,056 491 1.38 2,958 8.51 0.9861
2022-02-09 2021-12-31 13F MERCK COM 58933Y105 35,565 772 2.22 2,726 4.32 0.8050
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 34,793 15 0.04 2,613 -3.40 0.8626
2021-08-09 2021-06-30 13F MERCK COM 58933Y105 34,778 1,097 3.26 2,705 4.20 0.8934
2021-05-11 2021-03-31 13F MERCK & CO. COM 58933Y105 33,681 -199 -0.59 2,596 -6.32 0.9322
2021-02-05 2020-12-31 13F MERCK & CO. COM 58933Y105 33,880 -790 -2.28 2,771 -3.65 1.0750
2020-11-09 2020-09-30 13F MERCK & CO. COM 58933Y105 34,670 4,516 14.98 2,876 23.33 1.1866
2020-08-13 2020-06-30 13F MERCK & CO. COM 58933Y105 30,154 2,017 7.17 2,332 7.71 1.0379
2020-05-13 2020-03-31 13F MERCK & CO. COM 58933Y105 28,137 -1,158 -3.95 2,165 -18.73 1.2238
2020-02-05 2019-12-31 13F MERCK COM 58933Y105 29,295 -498 -1.67 2,664 6.22 1.1420
2019-11-01 2019-09-30 13F MERCK COM 58933Y105 29,793 -39 -0.13 2,508 0.28 1.1672
2019-08-02 2019-06-30 13F MERCK COM 58933Y105 29,832 1,076 3.74 2,501 4.56 1.1344
2019-05-20 2019-03-31 13F MERCK COM 58933Y105 28,756 -42 -0.15 2,392 8.73 1.1452
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 28,798 387 1.36 2,200 9.18 1.2028
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 28,411 843 3.06 2,015 20.44 0.9076
2018-08-16 2018-06-30 13F MERCK COM 58933Y105 27,568 -28 -0.10 1,673 11.31 0.8134
2018-05-10 2018-03-31 13F MERCK COM 58933Y105 27,596 1,972 7.70 1,503 4.23 0.7425
2018-02-13 2017-12-31 13F MERCK COM 58933Y105 25,624 145 0.57 1,442 -11.59 0.7083
2017-11-09 2017-09-30 13F MERCK COM 58933Y105 25,479 -230 -0.89 1,631 -1.03 0.8476
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 25,709 -123 -0.48 1,648 0.43 0.8737
2017-05-08 2017-03-31 13F MERCK COM 58933Y105 25,832 4,865 23.20 1,641 32.98 0.8332
2017-02-03 2016-12-31 13F MERCK COM 58933Y105 20,967 360 1.75 1,234 -4.04 1.0922
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 20,607 0 0.00 1,286 8.34 1.2864
2016-08-12 2016-06-30 13F MERCK COM 58933Y105 20,607 -585 -2.76 1,187 5.89 1.1950
2016-05-11 2016-03-31 13F MERCK & CO INC COM 58933Y105 21,192 2,152 11.30 1,121 11.43 1.0692
2016-02-08 2015-12-31 13F MERCK & CO INC COM 58933Y105 19,040 -273 -1.41 1,006 5.45 0.9963
2015-11-09 2015-09-30 13F MERCK & CO INC COM 58933Y105 19,313 529 2.82 954 -10.76 1.0023
2015-08-14 2015-06-30 13F MERCK & CO INC COM 58933Y105 18,784 1,750 10.27 1,069 9.19 1.0915
2015-05-14 2015-03-31 13F MERCK & CO INC COM 58933Y105 17,034 1,901 12.56 979 13.97 0.9947
2015-02-13 2014-12-31 13F MERCK & CO INC COM 58933Y105 15,133 15,133 859 0.8780
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.