Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionInvestors Research Corp
Latest Disclosed Ownership8,958 shares
Latest Disclosed Value $ 1,077,558
Investors Research Corp reports 3.94% decrease in ownership of MRK / Merck & Co., Inc.

On April 3, 2026 - Investors Research Corp filed a 13F-HR form disclosing ownership of 8,958 shares of Merck & Co., Inc. (MX:MRK) valued at $1,077,558 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 6, 2026 disclosing 9,325 shares of Merck & Co., Inc.. This represents a change in shares of -3.94% 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)
2026-04-03 2026-03-31 13F MERCK COM 58933Y105 8,958 -367 -3.94 1,078 9.79 0.1988
2026-01-06 2025-12-31 13F MERCK COM 58933Y105 9,325 0 0.00 982 25.45 0.1797
2025-10-02 2025-09-30 13F MERCK COM 58933Y105 9,325 120 1.30 783 7.42 0.1448
2025-07-07 2025-06-30 13F MERCK COM 58933Y105 9,205 0 0.00 729 -11.86 0.1429
2025-04-08 2025-03-31 13F MERCK COM 58933Y105 9,205 150 1.66 826 -8.22 0.1789
2025-02-07 2024-12-31 13F MERCK COM 58933Y105 9,055 -121 -1.32 901 -13.63 0.1979
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 9,176 0 0.00 1,042 -8.19 0.2277
2024-07-31 2024-06-30 13F MERCK COM 58933Y105 9,176 0 0.00 1,136 -6.20 0.2654
2024-05-06 2024-03-31 13F MERCK COM 58933Y105 9,176 -7,307 -44.33 1,211 -32.63 0.2831
2024-01-30 2023-12-31 13F MERCK COM 58933Y105 16,483 0 0.00 1,797 5.90 0.4337
2023-11-01 2023-09-30 13F MERCK COM 58933Y105 16,483 0 0.00 1,697 -10.78 0.4431
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 16,483 -1,114 -6.33 1,902 1.55 0.4801
2023-05-11 2023-03-31 13F MERCK COM 58933Y105 17,597 -300 -1.68 1,872 -5.69 0.4863
2023-02-06 2022-12-31 13F MERCK COM 58933Y105 17,897 -175 -0.97 1,986 27.57 0.5372
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 18,072 82 0.46 1,556 -5.12 0.4766
2022-07-21 2022-06-30 13F MERCK COM 58933Y105 17,990 46 0.26 1,640 11.41 0.4930
2022-04-13 2022-03-31 13F MERCK & CO. COM 58933Y105 17,944 6,668 59.13 1,472 70.37 0.4157
2022-01-27 2021-12-31 13F MERCK COM 58933Y105 11,276 0 0.00 864 2.01 0.2616
2021-10-27 2021-09-30 13F MERCK COM 58933Y105 11,276 0 0.00 847 -3.42 0.2859
2021-07-29 2021-06-30 13F MERCK COM 58933Y105 11,276 150 1.35 877 2.21 0.3034
2021-04-28 2021-03-31 13F MERCK & CO. COM 58933Y105 11,126 0 0.00 858 -5.71 0.3232
2021-01-21 2020-12-31 13F MERCK & CO. COM 58933Y105 11,126 0 0.00 910 -1.41 0.3581
2020-10-20 2020-09-30 13F MERCK & CO. COM 58933Y105 11,126 0 0.00 923 7.33 0.4479
2020-07-21 2020-06-30 13F MERCK & CO. COM 58933Y105 11,126 0 0.00 860 0.47 0.4315
2020-05-05 2020-03-31 13F MERCK & CO. COM 58933Y105 11,126 25 0.23 856 -15.25 0.5342
2020-02-11 2019-12-31 13F MERCK COM 58933Y105 11,101 275 2.54 1,010 10.87 0.4659
2019-10-22 2019-09-30 13F MERCK COM 58933Y105 10,826 710 7.02 911 7.43 0.4620
2019-07-08 2019-06-30 13F MERCK COM 58933Y105 10,116 0 0.00 848 0.83 0.4428
2019-04-23 2019-03-31 13F MERCK COM 58933Y105 10,116 -250 -2.41 841 6.19 0.4485
2019-02-04 2018-12-31 13F MERCK COM 58933Y105 10,366 -5,175 -33.30 792 -28.13 0.5531
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 15,541 466 3.09 1,102 20.44 0.6301
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 15,075 1,218 8.79 915 21.19 0.5308
2018-05-09 2018-03-31 13F MERCK COM 58933Y105 13,857 -200 -1.42 755 -4.55 0.4592
2018-02-13 2017-12-31 13F MERCK COM 58933Y105 14,057 14,057 791 0.4892
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.