Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionFishman Jay A Ltd/mi
Latest Disclosed Ownership56,886 shares
Latest Disclosed Value $ 6,842,817
Fishman Jay A Ltd/mi reports 5.53% decrease in ownership of MRK / Merck & Co., Inc.

On April 29, 2026 - Fishman Jay A Ltd/mi filed a 13F-HR form disclosing ownership of 56,886 shares of Merck & Co., Inc. (MX:MRK) valued at $6,842,817 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 60,216 shares of Merck & Co., Inc.. This represents a change in shares of -5.53% 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)
2026-04-29 2026-03-31 13F MERCK & CO INC COM com 58933Y105 56,886 -3,330 -5.53 6,843 7.95 0.6109
2026-01-28 2025-12-31 13F MERCK & CO INC COM com 58933Y105 60,216 -4,745 -7.30 6,338 16.25 0.5213
2025-11-05 2025-09-30 13F MERCK & CO INC COM com 58933Y105 64,961 -50,475 -43.73 5,452 -40.33 0.4673
2025-07-22 2025-06-30 13F MERCK & CO INC COM com 58933Y105 115,436 -26,690 -18.78 9,138 -28.38 0.8749
2025-04-22 2025-03-31 13F MERCK & CO INC COM com 58933Y105 142,126 -28,661 -16.78 12,757 -24.91 1.3933
2025-01-29 2024-12-31 13F MERCK & CO INC COM com 58933Y105 170,787 11,816 7.43 16,990 -5.89 1.5933
2024-10-30 2024-09-30 13F MERCK & CO INC COM com 58933Y105 158,971 13,060 8.95 18,053 -0.06 1.7934
2024-08-05 2024-06-30 13F/A-1 MERCK & CO INC COM com 58933Y105 145,911 10,595 7.83 18,064 1.17 1.9034
2024-07-31 2024-06-30 13F MERCK & CO INC COM com 58933Y105 9,900 -125,416 18,064 1.9034
2024-04-23 2024-03-31 13F MERCK & CO INC COM com 58933Y105 135,316 5,415 4.17 17,855 26.08 1.9726
2024-01-24 2023-12-31 13F MERCK & CO INC COM com 58933Y105 129,901 4,965 3.97 14,162 10.10 1.6207
2023-11-13 2023-09-30 13F MERCK com 58933Y105 124,936 30,150 31.81 12,862 17.60 1.6286
2023-08-15 2023-06-30 13F/A-1 MERCK com 58933Y105 94,786 43,175 83.65 10,937 99.22 1.3250
2023-08-15 2023-06-30 13F MERCK com 58933Y105 94,786 10,937
2023-05-09 2023-03-31 13F MERCK com 58933Y105 51,611 350 0.68 5,491 -3.46 0.7011
2023-02-13 2022-12-31 13F MERCK com 58933Y105 51,261 -2,000 -3.76 5,687 24.01 0.8000
2022-10-26 2022-09-30 13F MERCK com 58933Y105 53,261 -50 -0.09 4,587 -5.64 0.6634
2022-08-09 2022-06-30 13F MERCK com 58933Y105 53,311 -375 -0.70 4,860 10.35 0.6622
2022-05-10 2022-03-31 13F MERCK com 58933Y105 53,686 -900 -1.65 4,405 5.28 0.4852
2022-02-14 2021-12-31 13F MERCK com 58933Y105 54,586 -2,419 -4.24 4,183 -2.29 0.4469
2021-11-08 2021-09-30 13F MERCK com 58933Y105 57,005 -4,675 -7.58 4,282 -10.74 0.5302
2021-08-09 2021-06-30 13F MERCK com 58933Y105 61,680 -3,760 -5.75 4,797 -4.92 0.5864
2021-05-03 2021-03-31 13F MERCK com 58933Y105 65,440 -3,952 -5.70 5,045 -11.13 0.6804
2021-02-10 2020-12-31 13F MERCK csus 58933Y105 69,392 -4,885 -6.58 5,676 -7.87 0.7809
2020-11-10 2020-09-30 13F MERCK com 58933Y105 74,277 6,112 8.97 6,161 16.88 0.9748
2020-08-10 2020-06-30 13F MERCK com 58933Y105 68,165 2,000 3.02 5,271 3.56 0.9199
2020-05-13 2020-03-31 13F/A-82 MERCK com 58933Y105 66,165 9,775 17.33 5,091 -0.74 1.0547
2020-05-12 2020-03-31 13F MERCK com 58933Y105 56,510 120 4,700 877,552.0188
2020-02-04 2019-12-31 13F MERCK com 58933Y105 56,390 30 0.05 5,129 8.09 0.8835
2019-11-05 2019-09-30 13F/A-1 MERCK com 58933Y105 56,360 150 0.27 4,744 0.66 0.8891
2019-11-05 2019-09-30 13F MERCK com 58933Y105 56,360 150,000 4,744
2019-08-06 2019-06-30 13F MERCK com 58933Y105 56,210 -300 -0.53 4,713 0.30 0.8818
2019-05-01 2019-03-31 13F MERCK com 58933Y105 56,510 150 0.27 4,700 9.13 0.8776
2019-03-19 2018-12-31 13F/A-1 MERCK com 58933Y105 56,360 1,000 1.81 4,306 9.65 0.9327
2019-02-05 2018-12-31 13F MERCK com 58933Y105 56,360 1,000 4,306
2018-10-31 2018-09-30 13F MERCK com 58933Y105 55,360 -600 -1.07 3,927 15.64 0.6898
2018-08-06 2018-06-30 13F MERCK com 58933Y105 55,960 0 0.00 3,397 11.42 0.6352
2018-05-08 2018-03-31 13F MERCK com 58933Y105 55,960 -1,883 -3.26 3,048 -6.33 0.5761
2018-05-08 2017-12-31 13F/A-1 MERCK com 58933Y105 57,843 -9,910 -14.63 3,255 -24.99 0.6136
2018-02-05 2017-12-31 13F MERCK com 58933Y105 57,843 -9,910 3,255
2017-10-31 2017-09-30 13F MERCK com 58933Y105 67,753 -840 -1.22 4,338 -1.32 0.8845
2017-08-03 2017-06-30 13F MERCK com 58933Y105 68,593 0 0.00 4,396 0.87 0.9307
2017-05-10 2017-03-31 13F MERCK com 58933Y105 68,593 -5,590 -7.54 4,358 -0.21 0.9828
2017-02-06 2016-12-31 13F MERCK com 58933Y105 74,183 -4,125 -5.27 4,367 -10.64 1.0777
2016-11-03 2016-09-30 13F MERCK com 58933Y105 78,308 -1,021 -1.29 4,887 6.94 1.2051
2016-08-09 2016-06-30 13F MERCK com 58933Y105 79,329 -3,250 -3.94 4,570 4.60 1.1583
2016-05-10 2016-03-31 13F MERCK com 58933Y105 82,579 -9,998 -10.80 4,369 -10.64 1.1366
2016-02-08 2015-12-31 13F MERCK com 58933Y105 92,577 -1,350 -1.44 4,890 5.39 1.1901
2015-11-02 2015-09-30 13F MERCK com 58933Y105 93,927 -7,470 -7.37 4,639 -19.63 1.1121
2015-08-05 2015-06-30 13F MERCK com 58933Y105 101,397 -7,425 -6.82 5,773 -7.72 1.1998
2015-04-29 2015-03-31 13F MERCK com 58933Y105 108,822 108,822 0.00 6,255 1.3102
2015-02-03 2014-12-31 13F MERCK com 58933Y105 0 -116,050 -100.00 0 -100.00
2014-10-28 2014-09-30 13F MERCK com 58933Y105 116,050 -100 -0.09 6,879 2.38 1.5162
2014-07-29 2014-06-30 13F MERCK com 58933Y105 116,150 1,150 1.00 6,719 2.93 1.4447
2014-05-01 2014-03-31 13F MERCK com 58933Y105 115,000 -550 -0.48 6,529 12.88 1.4577
2014-01-28 2013-12-31 13F MERCK com 58933Y105 115,550 -100,050 -46.41 5,783 -43.66 1.2966
2013-10-29 2013-09-30 13F MERCK com 58933Y105 215,600 -1,350 -0.62 10,265 1.86 2.5604
2013-08-06 2013-06-30 13F MERCK com 58933Y105 216,950 216,950 10,077 2.6172
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.