Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRFG Advisory, LLC
Latest Disclosed Ownership25,838 shares
Latest Disclosed Value $ 3,108,007
RFG Advisory, LLC reports 45.94% decrease in ownership of MRK / Merck & Co., Inc.

On April 17, 2026 - RFG Advisory, LLC filed a 13F-HR form disclosing ownership of 25,838 shares of Merck & Co., Inc. (MX:MRK) valued at $3,108,007 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 47,794 shares of Merck & Co., Inc.. This represents a change in shares of -45.94% 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)
2026-04-17 2026-03-31 13F MERCK COM 58933Y105 25,838 -21,956 -45.94 3,108 -38.21 0.0571
2026-02-03 2025-12-31 13F MERCK COM 58933Y105 47,794 79 0.17 5,031 25.62 0.0947
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 47,715 -387 -0.80 4,005 5.17 0.0828
2025-07-28 2025-06-30 13F MERCK COM 58933Y105 48,102 -15,467 -24.33 3,808 -33.27 0.0895
2025-04-09 2025-03-31 13F MERCK COM 58933Y105 63,569 30,274 90.93 5,706 72.25 0.1542
2025-01-21 2024-12-31 13F MERCK COM 58933Y105 33,295 -9,195 -21.64 3,312 -31.36 0.0937
2024-10-17 2024-09-30 13F MERCK COM 58933Y105 42,490 -6,225 -12.78 4,825 -19.98 0.1470
2024-07-15 2024-06-30 13F MERCK COM 58933Y105 48,715 10,746 28.30 6,031 20.36 0.1965
2024-04-11 2024-03-31 13F MERCK COM 58933Y105 37,969 -1,039 -2.66 5,010 17.83 0.1705
2024-01-25 2023-12-31 13F MERCK COM 58933Y105 39,008 -1,467 -3.62 4,253 2.06 0.1658
2023-10-16 2023-09-30 13F MERCK COM 58933Y105 40,475 5,360 15.26 4,167 2.84 0.1863
2023-08-03 2023-06-30 13F MERCK COM 58933Y105 35,115 -1,242 -3.42 4,052 4.73 0.1800
2023-05-09 2023-03-31 13F MERCK COM 58933Y105 36,357 -520 -1.41 3,868 1.90 0.1893
2023-02-15 2022-12-31 13F MERCK COM 58933Y105 36,877 -384 -1.03 3,796 0.37 0.1916
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 37,261 3,169 9.30 3,782 26.91 0.2152
2022-08-09 2022-06-30 13F MERCK COM 58933Y105 34,092 13,181 63.03 2,980 73.66 0.1724
2022-05-11 2022-03-31 13F MERCK COM 58933Y105 20,911 -40 -0.19 1,716 6.85 0.1095
2022-02-02 2021-12-31 13F MERCK COM 58933Y105 20,951 547 2.68 1,606 4.76 0.1103
2021-10-19 2021-09-30 13F MERCK COM 58933Y105 20,404 6,129 42.94 1,533 38.11 0.1261
2021-07-29 2021-06-30 13F MERCK COM 58933Y105 14,275 -773 -5.14 1,110 -4.31 0.0988
2021-04-19 2021-03-31 13F MERCK COM 58933Y105 15,048 -313 -2.04 1,160 -9.02 0.1264
2021-02-02 2020-12-31 13F MERCK COM 58933Y105 15,361 -1,615 -9.51 1,275 -9.45 0.1669
2020-10-13 2020-09-30 13F MERCK COM 58933Y105 16,976 95 0.56 1,408 7.89 0.1975
2020-08-03 2020-06-30 13F MERCK COM 58933Y105 16,881 1,646 10.80 1,305 11.35 0.2029
2020-04-17 2020-03-31 13F MERCK COM 58933Y105 15,235 1,085 7.67 1,172 -8.94 0.2201
2020-01-22 2019-12-31 13F MERCK COM 58933Y105 14,150 2,540 21.88 1,287 31.73 0.2190
2019-11-13 2019-09-30 13F MERCK COM 58933Y105 11,610 562 5.09 977 5.39 0.1943
2019-08-23 2019-06-30 13F/A-1 MERCK COM 58933Y105 11,048 5,201 88.95 927 90.35 0.2115
2019-08-15 2019-06-30 13F MERCK COM 58933Y105 6,312 465 531
2019-04-25 2019-03-31 13F MERCK COM 58933Y105 5,847 196 3.47 487 12.73 0.1242
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 5,651 -1,436 -20.26 432 -22.86 0.1061
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 7,087 1,404 24.71 560 62.32 0.1468
2018-07-24 2018-06-30 13F MERCK COM 58933Y105 5,683 -8,494 -59.91 345 -55.31 0.1040
2018-05-10 2018-03-31 13F MERCK COM 58933Y105 14,177 -425 -2.91 772 -6.65 0.2868
2018-02-08 2017-12-31 13F MERCK COM 58933Y105 14,602 1,220 9.12 827 -3.95 0.3857
2017-11-02 2017-09-30 13F MERCK COM 58933Y105 13,382 -388 -2.82 861 -0.58 0.5315
2017-11-01 2017-06-30 13F/A-2 MERCK COM 58933Y105 13,770 -291 -2.07 866 -3.13 0.5962
2017-08-14 2017-06-30 13F/A-1 MERCK COM 58933Y105 13,964 194 878 0.4528
2017-08-07 2017-06-30 13F MERCK COM 58933Y105 29,270 15,033 1,857
2017-11-01 2017-03-31 13F/A-1 MERCK COM 58933Y105 14,061 5,865 71.56 894 74.61 0.6753
2017-05-12 2017-03-31 13F MERCK COM 58933Y105 14,237 5,516 905
2017-11-01 2016-12-31 13F/A-1 MERCK COM 58933Y105 8,196 0 0.00 512 0.00 0.4881
2017-02-07 2016-12-31 13F MERCK COM 58933Y105 8,721 525 545
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 8,196 20 0.24 512 8.70 0.4684
2016-08-03 2016-06-30 13F MERCK COM 58933Y105 8,176 -20 -0.24 471 8.53 0.4095
2016-05-13 2016-03-31 13F MERCK & CO INC COM 58933Y105 8,196 1,920 30.59 434 31.12 0.3390
2016-02-09 2015-12-31 13F MERCK & CO INC COM 58933Y105 6,276 393 6.68 331 13.75 0.2435
2015-11-10 2015-09-30 13F MERCK & CO INC COM 58933Y105 5,883 -1,048 -15.12 291 -26.33 0.9371
2015-08-11 2015-06-30 13F MERCK & CO INC COM 58933Y105 6,931 6,931 395 0.1783
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.