Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionLazard Asset Management Llc
Latest Disclosed Ownership3,254,331 shares
Latest Disclosed Value $ 391,463,521
Lazard Asset Management Llc reports 26.16% decrease in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - Lazard Asset Management Llc filed a 13F-HR form disclosing ownership of 3,254,331 shares of Merck & Co., Inc. (MX:MRK) valued at $391,463,521 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 4,407,041 shares of Merck & Co., Inc.. This represents a change in shares of -26.16% 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)
2026-05-15 2026-03-31 13F MERCK COM 58933Y105 3,254,331 -1,152,710 -26.16 391,464 -15.61 0.3356
2026-02-17 2025-12-31 13F MERCK COM 58933Y105 4,407,041 -2,656,631 -37.61 463,885 -21.75 0.7860
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 7,063,672 454,605 6.88 592,854 113,256.21 0.7982
2025-08-14 2025-06-30 13F MERCK Common Stock 58933Y105 6,609,067 1,590,438 31.69 523 16.22 0.7200
2025-05-15 2025-03-31 13F MERCK Common Stock 58933Y105 5,018,629 1,609,690 47.22 450 32.74 0.6916
2025-02-14 2024-12-31 13F MERCK Common Stock 58933Y105 3,408,939 2,775,313 438.00 339 377.46 0.4961
2024-11-14 2024-09-30 13F MERCK Common Stock 58933Y105 633,626 -573,279 -47.50 72 -52.35 0.0962
2024-08-14 2024-06-30 13F MERCK Common Stock 58933Y105 1,206,905 24,514 2.07 149 -4.49 0.1874
2024-07-09 2024-03-31 13F/A-1 MERCK Common Stock 58933Y105 1,182,391 15,779 1.35 156 22.83 0.1896
2024-05-14 2024-03-31 13F MERCK Common Stock 58933Y105 1,182,391 15,779 156 0.1893
2024-02-14 2023-12-31 13F MERCK Common Stock 58933Y105 1,166,612 -347,801 -22.97 127 -18.06 0.1609
2023-11-14 2023-09-30 13F MERCK Common Stock 58933Y105 1,514,413 -21,205 -1.38 156 -12.43 0.2121
2023-08-15 2023-06-30 13F MERCK Common Stock 58933Y105 1,535,618 -13,699 -0.88 177 7.93 0.2181
2023-05-15 2023-03-31 13F MERCK Common Stock 58933Y105 1,549,317 -29,611 -1.88 165 -99.91 0.2160
2023-02-15 2022-12-31 13F MERCK Common Stock 58933Y105 1,578,928 2,483 0.16 175,180 29.03 0.2413
2022-11-14 2022-09-30 13F MERCK Common Stock 58933Y105 1,576,445 3,578 0.23 135,762 -5.32 0.1983
2022-08-09 2022-06-30 13F MERCK Common Stock 58933Y105 1,572,867 769,454 95.77 143,396 117.54 0.1939
2022-05-13 2022-03-31 13F MERCK Common Stock 58933Y105 803,413 244,353 43.71 65,918 53.86 0.0764
2022-02-09 2021-12-31 13F MERCK Common Stock 58933Y105 559,060 44,370 8.62 42,844 10.83 0.0456
2021-11-15 2021-09-30 13F MERCK Common Stock 58933Y105 514,690 -391,117 -43.18 38,656 -45.12 0.0436
2021-08-12 2021-06-30 13F MERCK Common Stock 58933Y105 905,807 -863,035 -48.79 70,443 -48.34 0.0791
2021-05-14 2021-03-31 13F MERCK Common Stock 58933Y105 1,768,842 -27,166 -1.51 136,359 -7.18 0.1652
2021-02-11 2020-12-31 13F MERCK Common Stock 58933Y105 1,796,008 -6,821 -0.38 146,912 -1.76 0.1856
2020-11-13 2020-09-30 13F MERCK Common Stock 58933Y105 1,802,829 186,470 11.54 149,543 19.64 0.2102
2020-08-13 2020-06-30 13F MERCK Common Stock 58933Y105 1,616,359 -23,669 -1.44 124,991 -0.94 0.1921
2020-05-14 2020-03-31 13F MERCK Common Stock 58933Y105 1,640,028 107,501 7.01 126,183 -9.47 0.2312
2020-02-13 2019-12-31 13F MERCK Common Stock 58933Y105 1,532,527 183,462 13.60 139,382 22.74 0.1991
2019-11-14 2019-09-30 13F MERCK Common Stock 58933Y105 1,349,065 -49,535 -3.54 113,563 -3.16 0.1866
2019-08-14 2019-06-30 13F MERCK Common Stock 58933Y105 1,398,600 127,040 9.99 117,271 10.89 0.1902
2019-08-28 2019-03-31 13F/A-1 MERCK Common Stock 58933Y105 1,271,560 962,662 311.64 105,754 348.07 0.1730
2019-05-13 2019-03-31 13F MERCK Common Stock 58933Y105 1,271,560 961,969 105,754
2019-08-28 2018-12-31 13F/A-1 MERCK Common Stock 58933Y105 308,898 65,980 27.16 23,602 36.97 0.0434
2019-02-13 2018-12-31 13F MERCK Common Stock 58933Y105 309,591 65,908 23,654
2019-08-30 2018-09-30 13F/A-1 MERCK Common Stock 58933Y105 242,918 24,379 11.16 17,232 29.92 0.0279
2018-11-13 2018-09-30 13F MERCK Common Stock 58933Y105 243,683 25,144 17,286
2019-08-30 2018-06-30 13F/A-1 MERCK Common Stock 58933Y105 218,539 106,606 95.24 13,264 117.59 0.0230
2018-08-13 2018-06-30 13F MERCK Common Stock 58933Y105 219,304 107,371 13,310
2019-08-28 2018-03-31 13F/A-1 MERCK Common Stock 58933Y105 111,933 -29,269 -20.73 6,096 -23.26 0.0104
2018-05-14 2018-03-31 13F MERCK Common Stock 58933Y105 111,933 -29,269 6,096
2019-08-28 2017-12-31 13F/A-1 MERCK Common Stock 58933Y105 141,202 -235,361 -62.50 7,944 -67.05 0.0136
2018-02-13 2017-12-31 13F MERCK Common Stock 58933Y105 141,202 -235,361 7,944
2019-08-19 2017-09-30 13F/A-1 MERCK Common Stock 58933Y105 376,563 -436,960 -53.71 24,110 -53.76 0.0436
2017-11-13 2017-09-30 13F MERCK Common Stock 58933Y105 376,563 -436,860 24,110
2019-08-19 2017-06-30 13F/A-1 MERCK Common Stock 58933Y105 813,523 -313,459 -27.81 52,138 -27.19 0.0981
2017-08-11 2017-06-30 13F MERCK Common Stock 58933Y105 813,423 -313,559 52,131
2019-08-13 2017-03-31 13F/A-1 MERCK Common Stock 58933Y105 1,126,982 262,726 30.40 71,608 40.74 0.1351
2017-05-12 2017-03-31 13F MERCK Common Stock 58933Y105 1,128,175 264,025 71,683
2019-07-30 2016-12-31 13F/A-1 MERCK Common Stock 58933Y105 864,256 -367,905 -29.86 50,878 -33.84 0.1038
2017-02-13 2016-12-31 13F MERCK Common Stock 58933Y105 864,150 -292,611 50,872
2019-08-07 2016-09-30 13F/A-1 MERCK Common Stock 58933Y105 1,232,161 -107,417 -8.02 76,898 -0.36 0.1528
2016-11-14 2016-09-30 13F MERCK Common Stock 58933Y105 1,156,761 -107,417 72,192
2019-07-29 2016-06-30 13F/A-1 MERCK Common Stock 58933Y105 1,339,578 -342,142 -20.34 77,172 -13.27 0.1628
2016-08-15 2016-06-30 13F MERCK Common Stock 58933Y105 1,264,178 -417,542 72,828
2019-07-25 2016-03-31 13F/A-1 MERCK Common Stock 58933Y105 1,681,720 -253,761 -13.11 88,978 -12.96 0.1941
2016-05-12 2016-03-31 13F MERCK Common Stock 58933Y105 1,606,320 -329,161 84,988
2019-07-24 2015-12-31 13F/A-1 MERCK Common Stock 58933Y105 1,935,481 -558,837 -22.40 102,231 -17.02 0.2339
2016-02-12 2015-12-31 13F MERCK Common Stock 58933Y105 1,860,144 -634,174 98,252
2019-07-15 2015-09-30 13F/A-1 MERCK Common Stock 58933Y105 2,494,318 -260,623 -9.46 123,193 -21.45 0.2945
2015-11-13 2015-09-30 13F MERCK Common Stock 58933Y105 2,494,318 -260,623 123,193
2019-07-08 2015-06-30 13F/A-1 MERCK Common Stock 58933Y105 2,754,941 -238,380 -7.96 156,837 -8.84 0.3288
2015-08-13 2015-06-30 13F MERCK Common Stock 58933Y105 2,754,941 -238,380 156,837
2015-06-09 2015-03-31 13F/A-1 MERCK Common Stock 58933Y105 2,993,321 -177,553 -5.60 172,055 -4.45 0.3708
2015-05-15 2015-03-31 13F MERCK Common Stock 58933Y105 5,986,642 344,111
2019-08-29 2014-12-31 13F/A-3 MERCK Common Stock 58933Y105 3,170,874 -217,466 -6.42 180,072 -10.35 0.3845
2015-05-20 2014-12-31 13F/A-1 MERCK Common Stock 58933Y105 5,996,166 2,825,292 340,521 0.6557
2015-06-09 2014-12-31 13F/A-2 MERCK Common Stock 58933Y105 3,170,874 -2,825,292 180,072 0.4109
2015-02-12 2014-12-31 13F MERCK Common Stock 58933Y105 3,170,874 180,072
2014-11-07 2014-09-30 13F MERCK Common Stock 58933Y105 3,388,340 -372,277 -9.90 200,860 -7.67 0.4313
2014-08-12 2014-06-30 13F MERCK Common Stock 58933Y105 3,760,617 -175,741 -4.46 217,551 -2.65 0.4547
2014-05-12 2014-03-31 13F MERCK Common Stock 58933Y105 3,936,358 -231,408 -5.55 223,465 7.13 0.4992
2014-02-14 2013-12-31 13F MERCK Common Stock 58933Y105 4,167,766 -184,889 -4.25 208,595 0.66 0.4630
2014-01-13 2013-09-30 13F/A-1 MERCK Common Stock 58933Y105 4,352,655 -462,211 -9.60 207,229 -7.34 0.4917
2013-11-13 2013-09-30 13F MERCK Common Stock 58933Y105 6,191,231 294,763
2013-08-13 2013-06-30 13F MERCK Common Stock 58933Y105 4,814,866 4,814,866 223,649 0.5300
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.