默克公司
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionKeystone Financial Group
Latest Disclosed Ownership23,222 shares
Latest Disclosed Value $ 2,744,256
Keystone Financial Group reports 2.06% increase in ownership of MRK / Merck & Co., Inc.

On May 13, 2026 - Keystone Financial Group filed a 13F-HR form disclosing ownership of 23,222 shares of Merck & Co., Inc. (MX:MRK) valued at $2,744,256 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 22,753 shares of Merck & Co., Inc.. This represents a change in shares of 2.06% 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)
2026-05-13 2026-03-31 13F MERCK Equtities 58933Y105 23,222 469 2.06 2,744 14.57 0.1846
2026-02-06 2025-12-31 13F MERCK Equities 58933Y105 22,753 -1,899 -7.70 2,395 13.08 0.1772
2025-11-17 2025-09-30 13F/A-1 MERCK Common Stock 58933Y105 24,652 -2,449 -9.04 2,118 -1.35 0.1619
2025-11-14 2025-09-30 13F MERCK Common Stock 58933Y105 27,101 0 2,147 0.1707
2025-08-13 2025-06-30 13F MERCK Common Stock 58933Y105 27,101 395 1.48 2,147 -9.56 0.1937
2025-05-13 2025-03-31 13F MERCK Common Stock 58933Y105 26,706 -536 -1.97 2,375 -11.91 0.2414
2025-02-13 2024-12-31 13F MERCK Common Stock 58933Y105 27,242 234 0.87 2,696 -12.13 0.2651
2025-02-19 2024-09-30 13F/A-3 MERCK Common Stock 58933Y105 27,008 514 1.94 3,067 -6.49 0.3925
2025-02-18 2024-09-30 13F/A-2 MERCK Common Stock 58933Y105 25,407 -1,087 2,972 0.3867
2024-11-12 2024-09-30 13F MERCK Common Stock 58933Y105 27,008 514 3,067 1.0125
2024-07-31 2024-06-30 13F MERCK Common Stock 58933Y105 26,494 2 0.01 3,280 -6.15 1.1748
2024-05-08 2024-03-31 13F MERCK Common Stock 58933Y105 26,492 696 2.70 3,496 24.29 0.5092
2024-02-14 2023-12-31 13F/A-1 MERCK Common Stock 58933Y105 25,796 -987 -3.69 2,812 1.99 0.4889
2024-02-09 2023-12-31 13F MERCK Common Stock 58933Y105 25,796 -987 2,812 0.4889
2023-11-06 2023-09-30 13F MERCK Common Stock 58933Y105 26,783 -61 -0.23 2,757 -10.98 0.4618
2023-08-07 2023-06-30 13F MERCK Common Stock 58933Y105 26,844 401 1.52 3,097 5.59 0.5268
2023-02-07 2022-12-31 13F MERCK Common Stock 58933Y105 26,443 1,030 4.05 2,934 33.99 0.5793
2022-11-10 2022-09-30 13F MERCK Common Stock 58933Y105 25,413 633 2.55 2,189 -3.10 0.4438
2022-08-05 2022-06-30 13F MERCK Common Stock 58933Y105 24,780 -128 -0.51 2,259 10.52 0.4477
2022-05-13 2022-03-31 13F MERCK Common Stock 58933Y105 24,908 74 0.30 2,044 7.41 0.3471
2022-02-11 2021-12-31 13F MERCK Common Stock 58933Y105 24,834 67 0.27 1,903 2.31 0.3122
2021-11-12 2021-09-30 13F MERCK Common Stock 58933Y105 24,767 141 0.57 1,860 -2.87 0.3365
2021-08-13 2021-06-30 13F MERCK Common Stock 58933Y105 24,626 2,248 10.05 1,915 11.01 0.3469
2021-05-11 2021-03-31 13F MERCK Common Stock 58933Y105 22,378 -1,153 -4.90 1,725 -10.39 0.3360
2021-02-10 2020-12-31 13F MERCK Common Stock 58933Y105 23,531 429 1.86 1,925 0.47 0.4003
2020-11-13 2020-09-30 13F MERCK Common Stock 58933Y105 23,102 -241 -1.03 1,916 6.15 0.4703
2020-08-13 2020-06-30 13F MERCK Common Stock 58933Y105 23,343 -74 -0.32 1,805 0.17 0.4905
2020-05-05 2020-03-31 13F/A-1 MERCK Common Stock 58933Y105 23,417 2,714 13.11 1,802 -4.30 0.5972
2020-05-05 2020-03-31 13F MERCK Common Stock 58933Y105 20,703 0 1,883 505,872.7447
2020-02-06 2019-12-31 13F MERCK Common Stock 58933Y105 20,703 7 0.03 1,883 8.09 0.5059
2019-11-07 2019-09-30 13F MERCK Common Stock 58933Y105 20,696 133 0.65 1,742 1.04 0.5358
2019-08-07 2019-06-30 13F MERCK Common Stock 58933Y105 20,563 71 0.35 1,724 1.17 0.5608
2019-05-07 2019-03-31 13F MERCK Common Stock 58933Y105 20,492 5,763 39.13 1,704 51.47 0.6060
2019-02-11 2018-12-31 13F MERCK Common Stock 58933Y105 14,729 1,001 7.29 1,125 14.56 0.5084
2018-11-06 2018-09-30 13F MERCK Common Stock 58933Y105 13,728 13,728 982 0.4019
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.