Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionLsv Asset Management
Latest Disclosed Ownership5,088,709 shares
Latest Disclosed Value $ 612,121
Lsv Asset Management reports 1.66% decrease in ownership of MRK / Merck & Co., Inc.

On May 11, 2026 - Lsv Asset Management filed a 13F-HR form disclosing ownership of 5,088,709 shares of Merck & Co., Inc. (MX:MRK) valued at $612,121 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 5,174,433 shares of Merck & Co., Inc.. This represents a change in shares of -1.66% 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)
2026-05-11 2026-03-31 13F Merck COM 58933Y105 5,088,709 -85,724 -1.66 612 12.50 1.3191
2026-02-06 2025-12-31 13F Merck COM 58933Y105 5,174,433 -124,840 -2.36 545 22.52 1.1877
2025-11-06 2025-09-30 13F Merck COM 58933Y105 5,299,273 -37,163 -0.70 445 5.21 0.9821
2025-08-11 2025-06-30 13F Merck COM 58933Y105 5,336,436 -128,994 -2.36 422 -13.88 0.9889
2025-05-09 2025-03-31 13F Merck COM 58933Y105 5,465,430 -282,560 -4.92 491 -14.19 1.1775
2025-02-13 2024-12-31 13F Merck COM 58933Y105 5,747,990 -267,130 -4.44 572 -16.40 1.3199
2024-11-12 2024-09-30 13F Merck COM 58933Y105 6,015,120 -341,650 -5.37 683 -13.10 1.4640
2024-08-06 2024-06-30 13F Merck COM 58933Y105 6,356,770 -631,010 -9.03 787 -14.75 1.7242
2024-05-06 2024-03-31 13F Merck COM 58933Y105 6,987,780 -481,290 -6.44 922 13.27 1.9078
2024-02-06 2023-12-31 13F Merck COM 58933Y105 7,469,070 -345,130 -4.42 814 1.24 1.7769
2023-11-03 2023-09-30 13F Merck COM 58933Y105 7,814,200 -681,250 -8.02 804 -17.96 1.8713
2023-08-02 2023-06-30 13F Merck COM 58933Y105 8,495,450 -681,670 -7.43 980 0.41 2.1614
2023-05-02 2023-03-31 13F Merck COM 58933Y105 9,177,120 -738,800 -7.45 976 -11.27 2.1898
2023-02-08 2022-12-31 13F Merck COM 58933Y105 9,915,920 -1,425,875 -12.57 1,100 -99.89 2.4262
2022-11-07 2022-09-30 13F/A-1 Merck COM 58933Y105 11,341,795 -982,417 -7.97 976,755 -13.07 2.2948
2022-11-04 2022-09-30 13F Merck COM 58933Y105 12,324,212 0 1,123,598 2.4295
2022-08-10 2022-06-30 13F Merck COM 58933Y105 12,324,212 -1,318,074 -9.66 1,123,598 0.38 2.4295
2022-05-12 2022-03-31 13F Merck COM 58933Y105 13,642,286 -544,276 -3.84 1,119,350 2.95 2.0547
2022-01-28 2021-12-31 13F Merck COM 58933Y105 14,186,562 -499,210 -3.40 1,087,258 -1.43 1.9256
2021-11-04 2021-09-30 13F Merck COM 58933Y105 14,685,772 379,681 2.65 1,103,048 -0.86 1.9941
2021-08-04 2021-06-30 13F Merck COM 58933Y105 14,306,091 4,628,832 47.83 1,112,584 49.14 1.8917
2021-04-30 2021-03-31 13F Merck COM 58933Y105 9,677,259 -25,058 -0.26 746,019 -6.00 1.2744
2021-02-08 2020-12-31 13F Merck COM 58933Y105 9,702,317 1,117,333 13.01 793,649 11.45 1.4424
2020-10-23 2020-09-30 13F Merck COM 58933Y105 8,584,984 25,609 0.30 712,124 7.59 1.4568
2020-08-05 2020-06-30 13F Merck COM 58933Y105 8,559,375 573,850 7.19 661,896 7.73 1.3723
2020-05-07 2020-03-31 13F Merck COM 58933Y105 7,985,525 464,103 6.17 614,406 -10.18 1.4845
2020-02-10 2019-12-31 13F Merck COM 58933Y105 7,521,422 -244,452 -3.15 684,073 4.64 1.0661
2019-11-07 2019-09-30 13F Merck COM 58933Y105 7,765,874 -903,703 -10.42 653,731 -10.07 1.0808
2019-08-08 2019-06-30 13F/A-1 Merck COM 58933Y105 8,669,577 -293,077 -3.27 726,944 -2.48 1.1711
2019-08-07 2019-06-30 13F Merck COM 58933Y105 8,962,654 0 745,423
2019-05-07 2019-03-31 13F Merck COM 58933Y105 8,962,654 72,600 0.82 745,423 9.74 1.1941
2019-02-05 2018-12-31 13F Merck COM 58933Y105 8,890,054 -215,033 -2.36 679,289 5.17 1.2067
2018-11-06 2018-09-30 13F Merck COM 58933Y105 9,105,087 -497,606 -5.18 645,914 10.81 0.9661
2018-08-08 2018-06-30 13F Merck COM 58933Y105 9,602,693 33,899 0.35 582,883 11.83 0.9117
2018-05-04 2018-03-31 13F Merck COM 58933Y105 9,568,794 -40,306 -0.42 521,212 -3.60 0.8278
2018-01-31 2017-12-31 13F Merck COM 58933Y105 9,609,100 -346,838 -3.48 540,704 -15.18 0.8535
2017-11-13 2017-09-30 13F Merck COM 58933Y105 9,955,938 148,920 1.52 637,478 1.42 1.0515
2017-08-09 2017-06-30 13F Merck COM 58933Y105 9,807,018 110,107 1.14 628,531 2.01 1.1194
2017-05-01 2017-03-31 13F Merck COM 58933Y105 9,696,911 -80,800 -0.83 616,141 7.04 1.1229
2017-02-07 2016-12-31 13F Merck COM 58933Y105 9,777,711 -391,913 -3.85 575,613 -9.31 1.0593
2016-11-07 2016-09-30 13F Merck COM 58933Y105 10,169,624 -44,060 -0.43 634,686 7.86 1.2466
2016-08-05 2016-06-30 13F Merck COM 58933Y105 10,213,684 151,424 1.50 588,410 10.52 1.2038
2016-05-10 2016-03-31 13F Merck Sharp & Dohme COM 58933Y105 10,062,260 4,904,251 95.08 532,394 95.41 1.1156
2016-02-03 2015-12-31 13F Merck Sharp & Dohme COM 58933Y105 5,158,009 -163,740 -3.08 272,446 3.65 0.5914
2015-11-05 2015-09-30 13F Merck COM 58933Y105 5,321,749 1,190,900 28.83 262,841 11.77 0.5896
2015-08-07 2015-06-30 13F Merck COM 58933Y105 4,130,849 363,300 9.64 235,169 8.59 0.4876
2015-05-06 2015-03-31 13F Merck COM 58933Y105 3,767,549 3,767,549 0.00 216,558 0.4496
2015-02-04 2014-12-31 13F Merck COM 58933Y105 0 -4,209,249 -100.00 0 -100.00
2014-11-12 2014-09-30 13F Merck COM 58933Y105 4,209,249 -836,525 -16.58 249,524 -14.52 0.5466
2014-08-06 2014-06-30 13F Merck COM 58933Y105 5,045,774 -144,550 -2.78 291,898 -0.94 0.6472
2014-04-29 2014-03-31 13F Merck COM 58933Y105 5,190,324 -2,139,916 -29.19 294,654 -19.69 0.6867
2014-02-05 2013-12-31 13F Merck COM 58933Y105 7,330,240 -615,359 -7.74 366,878 -3.02 0.8620
2013-11-08 2013-09-30 13F Merck COM 58933Y105 7,945,599 -692,820 -8.02 378,289 -5.72 0.9690
2013-08-12 2013-06-30 13F Merck COM 58933Y105 8,638,419 8,638,419 401,254 1.0715
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.