Merck & Co., Inc.
US ˙ NYSE ˙ US58933Y1055

SecurityMRK / Merck & Co., Inc.
InstitutionProbity Advisors, Inc.
Latest Disclosed Ownership20,319 shares
Latest Disclosed Value $ 2,444,188
Probity Advisors, Inc. reports 2.42% decrease in ownership of MRK / Merck & Co., Inc.

On April 28, 2026 - Probity Advisors, Inc. filed a 13F-HR form disclosing ownership of 20,319 shares of Merck & Co., Inc. (US:MRK) valued at $2,444,173 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 20,822 shares of Merck & Co., Inc.. This represents a change in shares of -2.42% during the quarter. The current value of the position is $2,443,563 USD.

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)
2026-04-28 2026-03-31 13F MERCK COM 58933Y105 20,319 -503 -2.42 2,444 11.55 0.3872
2026-01-27 2025-12-31 13F MERCK COM 58933Y105 20,822 688 3.42 2,192 29.72 0.3510
2025-10-30 2025-09-30 13F MERCK COM 58933Y105 20,134 1,219 6.44 1,690 12.83 0.2739
2025-07-30 2025-06-30 13F MERCK COM 58933Y105 18,915 1,168 6.58 1,497 -5.97 0.2630
2025-05-09 2025-03-31 13F MERCK COM 58933Y105 17,747 830 4.91 1,593 -5.35 0.3059
2025-03-05 2024-12-31 13F MERCK COM 58933Y105 16,917 683 4.21 1,683 -8.74 0.3239
2024-10-16 2024-09-30 13F MERCK COM 58933Y105 16,234 226 1.41 1,844 -6.97 0.3530
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 16,008 -712 -4.26 1,982 -10.20 0.4106
2024-05-03 2024-03-31 13F MERCK COM 58933Y105 16,720 -252 -1.48 2,206 19.24 0.4562
2024-02-12 2023-12-31 13F MERCK COM 58933Y105 16,972 -180 -1.05 1,850 4.82 0.4031
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 17,152 -71 -0.41 1,766 -11.17 0.4072
2023-08-10 2023-06-30 13F MERCK COM 58933Y105 17,223 -974 -5.35 1,987 -1.54 0.4339
2023-02-15 2022-12-31 13F MERCK COM 58933Y105 18,197 -489 -2.62 2,019 25.42 0.4573
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 18,686 -1,330 -6.64 1,609 -11.84 0.3993
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 20,016 -290 -1.43 1,825 9.54 0.4226
2022-05-10 2022-03-31 13F MERCK COM 58933Y105 20,306 -1,315 -6.08 1,666 0.54 0.3437
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 21,621 263 1.23 1,657 3.30 0.3277
2021-10-08 2021-09-30 13F MERCK COM 58933Y105 21,358 1,049 5.17 1,604 1.58 0.3314
2021-08-06 2021-06-30 13F MERCK COM 58933Y105 20,309 -24 -0.12 1,579 0.77 0.3325
2021-04-28 2021-03-31 13F MERCK & CO. COM 58933Y105 20,333 902 4.64 1,567 -2.79 0.3500
2020-11-09 2020-09-30 13F MERCK & CO. COM 58933Y105 19,431 22 0.11 1,612 7.40 0.4561
2020-08-03 2020-06-30 13F MERCK & CO. COM 58933Y105 19,409 577 3.06 1,501 3.59 0.4651
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 18,832 -205 -1.08 1,449 -16.29 0.5324
2020-02-13 2019-12-31 13F MERCK COM 58933Y105 19,037 -321 -1.66 1,731 6.20 0.5231
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 19,358 3 0.02 1,630 0.43 0.5290
2019-08-08 2019-06-30 13F MERCK COM 58933Y105 19,355 -648 -3.24 1,623 -2.46 0.5388
2019-04-29 2019-03-31 13F MERCK COM 58933Y105 20,003 -55 -0.27 1,664 8.55 0.5721
2019-02-12 2018-12-31 13F MERCK COM 58933Y105 20,058 -218 -1.08 1,533 6.61 0.5689
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 20,276 -808 -3.83 1,438 12.34 0.4669
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 21,084 -158 -0.74 1,280 10.63 0.4502
2018-04-16 2018-03-31 13F MERCK COM 58933Y105 21,242 1,298 6.51 1,157 3.12 0.4007
2018-02-08 2017-12-31 13F MERCK COM 58933Y105 19,944 -1,858 -8.52 1,122 -19.63 0.3923
2017-10-27 2017-09-30 13F MERCK COM 58933Y105 21,802 612 2.89 1,396 2.80 0.5194
2017-07-27 2017-06-30 13F MERCK COM 58933Y105 21,190 1,147 5.72 1,358 6.59 0.5126
2017-05-11 2017-03-31 13F MERCK COM 58933Y105 20,043 365 1.85 1,274 10.02 0.4940
2017-02-02 2016-12-31 13F MERCK COM 58933Y105 19,678 872 4.64 1,158 -1.36 0.4869
2016-11-07 2016-09-30 13F MERCK COM 58933Y105 18,806 -261 -1.37 1,174 6.92 0.5065
2016-08-15 2016-06-30 13F MERCK COM 58933Y105 19,067 19,067 1,098 0.4919
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.