Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
Institution1832 Asset Management L.P.
Latest Disclosed Ownership616,840 shares
Latest Disclosed Value $ 74,199,684
1832 Asset Management L.P. reports 47.35% decrease in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - 1832 Asset Management L.P. filed a 13F-HR form disclosing ownership of 616,840 shares of Merck & Co., Inc. (MX:MRK) valued at $74,199,684 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,171,636 shares of Merck & Co., Inc.. This represents a change in shares of -47.35% 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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 616,840 -554,796 -47.35 74,200 -39.84 0.0682
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 1,171,636 518,231 79.31 123,326 124.88 0.0939
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 653,405 99,621 17.99 54,840 25.10 0.0433
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 553,784 77,646 16.31 43,838 2.57 0.0342
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 476,138 -15,376 -3.13 42,738 -12.59 0.0388
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 491,514 436,641 795.73 48,896 684.71 0.0416
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 54,873 3,504 6.82 6,231 -2.01 0.0047
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 51,369 1,247 2.49 6,359 -3.84 0.0052
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 50,122 -3,954 -7.31 6,614 12.18 0.0039
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 54,076 -245,317 -81.94 5,895 -80.87 0.0085
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 299,393 -1,705,656 -85.07 30,823 -86.68 0.0437
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 2,005,049 -736,184 -26.86 231,363 -20.67 0.4499
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 2,741,233 -758,840 -21.68 291,640 -24.90 0.5999
2023-02-15 2022-12-31 13F MERCK COM 58933Y105 3,500,073 -256,737 -6.83 388,333 20.03 0.7983
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 3,756,810 -375,876 -9.10 323,536 -14.13 0.6892
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 4,132,686 4,053,991 5,151.52 376,777 5,815.80 0.7592
2022-05-16 2022-03-31 13F MERCK & CO. COM 58933Y105 78,695 -36,293 -31.56 6,369 -28.72 0.0104
2022-02-15 2021-12-31 13F MERCK COM 58933Y105 114,988 -161,079 -58.35 8,935 -57.20 0.0158
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 276,067 167,975 155.40 20,874 148.32 0.0391
2021-08-20 2021-06-30 13F/A-1 MERCK COM 58933Y105 108,092 -55,317 -33.85 8,406 -32.92 0.0163
2021-08-16 2021-06-30 13F MERCK COM 58933Y105 108,092 -55,317 8,406 0.0163
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 163,409 -519,362 -76.07 12,531 -77.15 0.0271
2021-02-16 2020-12-31 13F MERCK & CO. COM 58933Y105 682,771 -2,507,942 -78.60 54,846 -79.12 0.1283
2020-11-16 2020-09-30 13F MERCK & CO. COM 58933Y105 3,190,713 -434,686 -11.99 262,729 -5.39 0.6860
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 3,625,399 2,630,640 264.45 277,702 262.36 0.8335
2020-05-26 2020-03-31 13F/A-1 MERCK & CO. COM 58933Y105 994,759 -227,719 -18.63 76,637 -31.37 0.2763
2020-05-14 2020-03-31 13F MERCK & CO. COM 58933Y105 97,830 -1,124,648 7,579 57,305.0954
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 1,222,478 953,181 353.95 111,659 400.13 0.3399
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 269,297 2,113 0.79 22,326 0.56 0.0711
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 267,184 130,947 96.12 22,201 100.19 0.0718
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 136,237 -96,096 -41.36 11,090 -36.76 0.0378
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 232,333 -147,040 -38.76 17,535 -34.61 0.0693
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 379,373 6,604 1.77 26,818 17.17 0.0875
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 372,769 -206,889 -35.69 22,888 -27.34 0.0775
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 579,658 -381,468 -39.69 31,499 -41.25 0.1160
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 961,126 -1,496,757 -60.90 53,618 -64.91 0.1742
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 2,457,883 530,632 27.53 152,788 23.73 0.5352
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 1,927,251 311,428 19.27 123,484 20.23 0.5589
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 1,615,823 -129,597 -7.42 102,703 -0.07 0.3673
2017-04-01 2016-12-31 13F/A-1 MERCK COM 58933Y105 1,745,420 430,591 32.75 102,774 25.25 0.3152
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 1,298,320 79,047
2016-11-15 2016-09-30 13F MERCK COM 58933Y105 1,314,829 764,902 139.09 82,054 158.28 0.3083
2016-08-12 2016-06-30 13F/A-1 MERCK COM 58933Y105 549,927 2,089 0.38 31,769 -28.58 0.1236
2016-08-12 2016-06-30 13F MERCK COM 58933Y105 549,927 2,089 48,136 0.1160
2016-05-12 2016-03-31 13F MERCK & CO INC COM 58933Y105 547,838 434,222 382.18 44,485 639.69 0.1084
2016-02-12 2015-12-31 13F MERCK & CO INC COM 58933Y105 113,616 -28,267 -19.92 6,014 -14.46 0.0260
2015-11-12 2015-09-30 13F MERCK & CO INC COM 58933Y105 141,883 -592,565 -80.68 7,031 -83.12 0.0294
2015-08-13 2015-06-30 13F MERCK & CO INC COM 58933Y105 734,448 557,297 314.59 41,650 308.73 0.1413
2015-05-13 2015-03-31 13F MERCK & CO INC COM 58933Y105 177,151 -1,385,156 -88.66 10,190 -88.46 0.0383
2015-02-12 2014-12-31 13F MERCK & CO INC COM 58933Y105 1,562,307 241,272 18.26 88,267 12.95 0.2733
2014-11-12 2014-09-30 13F MERCK & CO INC COM 58933Y105 1,321,035 -273,172 -17.14 78,149 -15.19 0.2550
2014-08-13 2014-06-30 13F MERCK & CO INC COM 58933Y105 1,594,207 332,594 26.36 92,142 30.36 0.2903
2014-05-14 2014-03-31 13F MERCK & CO INC COM 58933Y105 1,261,613 883,033 233.25 70,685 273.78 0.2430
2014-02-13 2013-12-31 13F MERCK & CO INC COM 58933Y105 378,580 366,380 3,003.11 18,911 3,160.52 0.0727
2013-11-13 2013-09-30 13F MERCK & CO INC COM 58933Y105 12,200 -320,380 -96.33 580 -96.24 0.0026
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 332,580 332,580 15,412 0.0675
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.