Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionPerkins Capital Management Inc
Latest Disclosed Ownership7,750 shares
Latest Disclosed Value $ 932,247
Perkins Capital Management Inc reports 11.43% decrease in ownership of MRK / Merck & Co., Inc.

On April 23, 2026 - Perkins Capital Management Inc filed a 13F-HR form disclosing ownership of 7,750 shares of Merck & Co., Inc. (MX:MRK) valued at $932,247 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 8,750 shares of Merck & Co., Inc.. This represents a change in shares of -11.43% 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)
2026-04-23 2026-03-31 13F MERCK COM 58933Y105 7,750 -1,000 -11.43 932 1.19 0.8737
2026-02-04 2025-12-31 13F MERCK COM 58933Y105 8,750 0 0.00 921 25.48 0.7313
2025-10-31 2025-09-30 13F MERCK COM 58933Y105 8,750 0 0.00 734 6.07 0.6472
2025-08-07 2025-06-30 13F Merck COM 58933Y105 8,750 -1,750 -16.67 693 -26.54 0.6964
2025-05-07 2025-03-31 13F MERCK COM 58933Y105 10,500 0 0.00 942 -9.77 0.9938
2025-02-11 2024-12-31 13F MERCK COM 58933Y105 10,500 -250 -2.33 1,045 -14.43 0.9266
2024-10-31 2024-09-30 13F MERCK COM 58933Y105 10,750 -1,175 -9.85 1,221 121,900.00 1.1448
2024-08-09 2024-06-30 13F MERCK COM 58933Y105 11,925 -300 -2.45 1 0.00 1.3907
2024-05-09 2024-03-31 13F MERCK COM 58933Y105 12,225 0 0.00 2 0.00 1.3450
2024-01-22 2023-12-31 13F MERCK COM 58933Y105 12,225 400 3.38 1 0.00 1.1386
2023-11-02 2023-09-30 13F Merck COM 58933Y105 11,825 0 0.00 1 0.00 1.2065
2023-07-21 2023-06-30 13F MERCK COM 58933Y105 11,825 0 0.00 1 0.00 1.1886
2023-05-09 2023-03-31 13F MERCK COM 58933Y105 11,825 -100 -0.84 1 0.00 1.1861
2023-01-26 2022-12-31 13F MERCK COM 58933Y105 11,925 0 0.00 1 -99.90 1.3967
2022-10-24 2022-09-30 13F MERCK COM 58933Y105 11,925 -100 -0.83 1,027 -6.30 1.1492
2022-07-29 2022-06-30 13F MERCK COM 58933Y105 12,025 0 0.00 1,096 11.04 1.1345
2022-04-20 2022-03-31 13F MERCK COM 58933Y105 12,025 0 0.00 987 7.05 0.8091
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 12,025 -250 -2.04 922 0.00 0.6224
2021-10-25 2021-09-30 13F MERCK COM 58933Y105 12,275 0 0.00 922 -3.46 0.5708
2021-07-28 2021-06-30 13F MERCK COM 58933Y105 12,275 0 0.00 955 0.95 0.5419
2021-04-28 2021-03-31 13F MERCK & CO. COM 58933Y105 12,275 0 0.00 946 -5.78 0.5471
2021-02-09 2020-12-31 13F MERCK & CO. COM 58933Y105 12,275 -500 -3.91 1,004 -5.28 0.6566
2020-10-28 2020-09-30 13F MERCK & CO. COM 58933Y105 12,775 -40 -0.31 1,060 7.51 0.9736
2020-04-29 2020-03-31 13F MERCK & CO. COM 58933Y105 12,815 950 8.01 986 -8.62 1.1911
2020-02-03 2019-12-31 13F MERCK COM 58933Y105 11,865 125 1.06 1,079 9.21 0.9673
2019-10-23 2019-09-30 13F MERCK COM 58933Y105 11,740 2,500 27.06 988 27.48 0.8513
2019-08-09 2019-06-30 13F MERCK COM 58933Y105 9,240 -60 -0.65 775 0.26 0.5427
2019-04-22 2019-03-31 13F MERCK COM 58933Y105 9,300 1,500 19.23 773 29.70 0.5090
2019-02-11 2018-12-31 13F MERCK COM 58933Y105 7,800 -200 -2.50 596 4.93 0.4621
2018-10-22 2018-09-30 13F MERCK COM 58933Y105 8,000 -400 -4.76 568 11.37 0.3410
2018-08-02 2018-06-30 13F MERCK COM 58933Y105 8,400 -250 -2.89 510 8.28 0.3653
2018-04-23 2018-03-31 13F MERCK COM 58933Y105 8,650 2,850 49.14 471 44.48 0.4241
2018-01-26 2017-12-31 13F MERCK COM 58933Y105 5,800 -3,400 -36.96 326 -44.65 0.3135
2017-10-31 2017-09-30 13F MERCK COM 58933Y105 9,200 0 0.00 589 -0.17 0.6171
2017-07-26 2017-06-30 13F MERCK COM 58933Y105 9,200 2,450 36.30 590 37.53 0.6543
2017-04-19 2017-03-31 13F MERCK COM 58933Y105 6,750 2,000 42.11 429 53.21 0.4426
2017-02-01 2016-12-31 13F MERCK COM 58933Y105 4,750 4,750 280 0.3070
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.