Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionTwin Capital Management Inc
Latest Disclosed Ownership39,931 shares
Latest Disclosed Value $ 4,803,300
Twin Capital Management Inc reports 29.79% decrease in ownership of MRK / Merck & Co., Inc.

On May 5, 2026 - Twin Capital Management Inc filed a 13F-HR form disclosing ownership of 39,931 shares of Merck & Co., Inc. (MX:MRK) valued at $4,803,300 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 56,876 shares of Merck & Co., Inc.. This represents a change in shares of -29.79% 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)
2026-05-05 2026-03-31 13F MERCK COM 58933Y105 39,931 -16,945 -29.79 4,803 -19.76 0.6192
2026-02-06 2025-12-31 13F MERCK COM 58933Y105 56,876 4,783 9.18 5,987 36.92 0.7431
2025-11-05 2025-09-30 13F MERCK COM 58933Y105 52,093 -8,076 -13.42 4,372 -8.19 0.5506
2025-08-06 2025-06-30 13F MERCK COM 58933Y105 60,169 -437 -0.72 4,763 -12.45 0.5063
2025-05-05 2025-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 60,606 -858 -1.40 5,440 -11.04 0.6346
2025-02-13 2024-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 61,464 266 0.43 6,114 -12.02 0.6696
2024-11-12 2024-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 61,198 -1,048 -1.68 6,950 -9.82 0.7842
2024-08-14 2024-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 62,246 938 1.53 7,706 -4.73 0.9082
2024-05-13 2024-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 61,308 8,640 16.40 8,090 40.90 1.0027
2024-01-31 2023-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 52,668 1,820 3.58 5,742 9.69 0.7523
2023-11-13 2023-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 50,848 -26,213 -34.02 5,235 -41.14 0.7519
2023-08-07 2023-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 77,061 3,278 4.44 8,892 13.29 1.1594
2023-05-08 2023-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 73,783 -8,211 -10.01 7,850 87,111.11 1.0725
2023-01-31 2022-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 81,994 -1,721 -2.06 9 -99.88 1.1788
2022-10-21 2022-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 83,715 2,811 3.47 7,210 -2.25 0.9744
2022-08-02 2022-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 80,904 3,947 5.13 7,376 16.82 0.9417
2022-05-06 2022-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 76,957 4,695 6.50 6,314 14.01 0.6801
2022-02-07 2021-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 72,262 5,865 8.83 5,538 11.05 0.5542
2021-10-29 2021-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 66,397 -42,234 -38.88 4,987 -40.97 0.5110
2021-08-09 2021-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 108,631 -13,893 -11.34 8,448 -10.56 0.7786
2021-05-06 2021-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 122,524 -21,790 -15.10 9,445 -19.99 0.9405
2021-02-11 2020-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 144,314 -6,153 -4.09 11,805 -5.42 1.0736
2020-11-05 2020-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 150,467 -3,198 -2.08 12,481 5.03 1.1298
2020-08-04 2020-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 153,665 -8,445 -5.21 11,883 -4.73 1.1440
2020-04-29 2020-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 162,110 7,292 4.71 12,473 -11.42 1.3529
2020-01-29 2019-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 154,818 -38,110 -19.75 14,081 -13.30 1.1906
2019-10-28 2019-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 192,928 -4,313 -2.19 16,241 -1.80 1.1754
2019-08-01 2019-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 197,241 -80,032 -28.86 16,539 -28.28 1.1510
2019-05-03 2019-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 277,273 2,640 0.96 23,061 9.89 1.1364
2019-02-04 2018-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 274,633 -3,140 -1.13 20,985 6.50 1.1826
2018-11-07 2018-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 277,773 7,843 2.91 19,705 20.26 0.9053
2018-08-13 2018-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 269,930 780 0.29 16,385 11.76 0.8228
2018-05-01 2018-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 269,150 6,500 2.47 14,661 -0.80 0.7568
2018-01-29 2017-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 262,650 4,800 1.86 14,779 -10.48 0.7257
2017-11-09 2017-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 257,850 10,760 4.35 16,510 4.26 0.8666
2017-08-07 2017-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 247,090 31,900 14.82 15,836 15.82 0.9333
2017-05-08 2017-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 215,190 33,030 18.13 13,673 27.50 0.8465
2017-02-07 2016-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 182,160 35,420 24.14 10,724 17.10 0.6902
2016-11-14 2016-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 146,740 51,180 53.56 9,158 66.36 0.6129
2016-08-08 2016-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 95,560 300 0.31 5,505 9.23 0.4134
2016-05-11 2016-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 95,260 4,940 5.47 5,040 5.64 0.3905
2016-02-09 2015-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 90,320 -29,510 -24.63 4,771 -19.38 0.3912
2015-11-12 2015-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 119,830 4,700 4.08 5,918 -9.70 0.5611
2015-07-30 2015-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 115,130 5,940 5.44 6,554 4.43 0.5873
2015-05-12 2015-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 109,190 -3,510 -3.11 6,276 -1.94 0.5500
2015-02-09 2014-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 112,700 -33,070 -22.69 6,400 -25.93 0.6107
2014-11-10 2014-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 145,770 -1,910 -1.29 8,641 1.15 0.8755
2014-07-29 2014-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 147,680 147,680 8,543 19.15 0.8591
2014-05-13 2014-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 0 -131,580 -100.00 7,170 8.87 0.7560
2014-02-07 2013-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 131,580 -53,540 -28.92 6,586 -25.28 0.7045
2013-11-06 2013-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 185,120 185,120 8,814 5.08 0.9420
2013-08-12 2013-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 0 0 8,388 0.8917
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.