Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionSchroder Investment Management Group
Latest Disclosed Ownership1,756,247 shares
Latest Disclosed Value $ 211,258,952
Schroder Investment Management Group reports 4.14% increase in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Schroder Investment Management Group filed a 13F-HR form disclosing ownership of 1,756,247 shares of Merck & Co., Inc. (MX:MRK) valued at $211,258,952 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,686,481 shares of Merck & Co., Inc.. This represents a change in shares of 4.14% 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 1,756,247 69,766 4.14 211,259 19.01 0.0343
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 1,686,481 112,430 7.14 177,519 34.37 0.1346
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 1,574,051 85,833 5.77 132,110 12.14 0.1034
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 1,488,218 -162,123 -9.82 117,807 -20.47 0.0996
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 1,650,341 -3,483,219 -67.85 148,135 -70.99 0.1495
2025-02-12 2024-12-31 13F MERCK COM 58933Y105 5,133,560 -1,469,424 -22.25 510,687 -31.89 0.4893
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 6,602,984 -2,484,038 -27.34 749,835 -33.35 0.7685
2024-08-12 2024-06-30 13F MERCK COM 58933Y105 9,087,022 251,875 2.85 1,124,973 -3.50 1.2407
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 8,835,147 1,290,337 17.10 1,165,798 41.73 1.3713
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 7,544,810 404,648 5.67 822,535 11.90 1.0663
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 7,140,162 -274,058 -3.70 735,080 -14.08 1.0936
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 7,414,220 29,128 0.39 855,527 8.89 1.2273
2023-05-11 2023-03-31 13F MERCK COM 58933Y105 7,385,092 -31,275 -0.42 785,700 -4.51 1.1687
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 7,416,367 424,865 6.08 822,846 36.66 1.3063
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 6,991,502 1,244,515 21.66 602,108 14.92 0.9963
2022-08-11 2022-06-30 13F MERCK COM 58933Y105 5,746,987 1,156,119 25.18 523,953 38.51 0.7982
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 4,590,868 -119,392 -2.53 378,287 4.79 0.4997
2022-02-14 2021-12-31 13F Merck COM 58933Y105 4,710,260 7,950 0.17 360,995 2.21 0.4714
2021-11-12 2021-09-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 4,702,310 -965,650 -17.04 353,191 -19.87 0.5431
2021-08-13 2021-06-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,667,960 1,296,907 29.67 440,798 30.81 0.5522
2021-05-28 2021-03-31 13F/A-1 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 4,371,053 -629,101 -12.58 336,964 82,287.29 0.4371
2021-05-17 2021-03-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 4,371,053 -629,101 336,964 0.4371
2021-02-24 2020-12-31 13F/A-1 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,000,154 -487,196 -8.88 409 -99.91 0.5776
2021-02-16 2020-12-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,000,154 -487,196 409 0.5710
2020-11-13 2020-09-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,487,350 -16,695 -0.30 443,378 4.17 0.7090
2020-08-13 2020-06-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,504,045 -676,491 -10.95 425,629 -14.25 0.7720
2020-05-15 2020-03-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,180,536 -882,083 -12.49 496,359 -22.73 1.0617
2020-02-11 2019-12-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 7,062,619 256,944 3.78 642,346 13.84 1.0464
2019-11-12 2019-09-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,805,675 424,346 6.65 564,259 5.45 0.9950
2019-11-14 2019-06-30 13F/A-2 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,381,329 2,576,060 67.70 535,075 69.07 0.9729
2019-08-15 2019-06-30 13F/A-1 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,381,329 0 535,075 0.5740
2019-08-08 2019-06-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,381,329 2,576,060 535,075 574,056.0462
2019-11-15 2019-03-31 13F/A-1 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 3,805,269 193,673 5.36 316,485 14.68 0.5635
2019-05-14 2019-03-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 3,805,269 193,673 316,485 514,036.7931
2019-02-14 2018-12-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 3,611,596 -1,550,263 -30.03 275,963 -24.64 0.4993
2018-11-13 2018-09-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,161,859 54,841 1.07 366,182 18.91 0.6289
2018-08-23 2018-06-30 13F/A-2 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,107,018 -1,444,396 -22.05 307,954 -13.70 0.5391
2018-08-16 2018-06-30 13F/A-1 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,107,018 0 307,954 0.5391
2018-08-13 2018-06-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,107,018 -1,444,396 307,954 545,300.3029
2018-05-11 2018-03-31 13F/A-1 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,551,414 -112,717 -1.69 356,855 -4.84 0.6184
2018-05-11 2018-03-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,551,414 -112,717 356,855 618,400.5919
2018-02-09 2017-12-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,664,131 1,112,794 20.05 374,990 5.07 0.6137
2017-11-09 2017-09-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 5,551,337 -863,742 -13.46 356,895 -13.53 0.6201
2017-08-10 2017-06-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,415,079 -239,866 -3.60 412,746 -2.25 0.7441
2017-05-18 2017-03-31 13F/A-1 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,654,945 225,784 3.51 422,257 11.57 0.7589
2017-05-10 2017-03-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,654,945 225,784 422,257 759,004.3703
2017-02-10 2016-12-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,429,161 378,444 6.25 378,484 0.23 0.7245
2016-11-09 2016-09-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,050,717 -271,102 -4.29 377,625 3.69 0.7052
2016-08-08 2016-06-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,321,819 265,676 4.39 364,200 13.00 0.7313
2016-05-10 2016-03-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 6,056,143 -3,159,911 -34.29 322,307 -33.79 0.6663
2016-02-10 2015-12-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 9,216,054 -227,405 -2.41 486,792 4.37 1.0043
2015-11-13 2015-09-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 9,443,459 1,490,220 18.74 466,414 2.36 0.9863
2015-08-10 2015-06-30 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 7,953,239 -344,768 -4.15 455,641 -4.92 0.8955
2015-05-12 2015-03-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 8,298,007 -575,287 -6.48 479,210 -4.90 0.9369
2015-02-18 2014-12-31 13F/A-1 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 8,873,294 -570,785 503,914 0.9882
2015-02-25 2014-12-31 13F/A-2 MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 8,873,294 -570,785 -6.04 503,914 -9.99 0.9891
2015-02-17 2014-12-31 13F MERCK AND COMPANY INCORPORATED NEW USD0.01 COM 58933Y105 8,873,294 -570,785 503,914 731,702.3731
2014-11-13 2014-09-30 13F Merck And Co Inc NewCSUSD0.01 COM 58933Y105 9,444,079 -173,688 -1.81 559,845 0.62 0.7473
2014-08-13 2014-06-30 13F Merck And Co Inc NewCSUSD0 01 COM 58933Y105 9,617,767 1,634,883 20.48 556,388 22.77 0.6911
2014-05-15 2014-03-31 13F Merck And Co Inc NewCSUSD0.01 COM 58933Y105 7,982,884 690,259 9.47 453,188 24.16 0.5108
2014-02-14 2013-12-31 13F Merck And Co Inc NewCSUSD0.01 COM 58933Y105 7,292,625 38,482 0.53 364,996 5.68 0.4561
2013-12-09 2013-09-30 13F/A-1 Merck And Co Inc NewCSUSD0.01 COM 58933Y105 345,362,493 336,662,114 16,442,363 0.4954
2013-12-10 2013-09-30 13F/A-2 Merck And Co Inc NewCSUSD0.01 COM 58933Y105 7,254,143 -1,446,236 -16.62 345,362 -14.54 0.8385
2013-11-08 2013-09-30 13F Merck And Co Inc NewCSUSD0.01 COM 58933Y105 7,132,806 -1,567,573 339,586 837.9748
2013-08-12 2013-06-30 13F Merck And Co Inc NewCSUSD0.01 COM 58933Y105 8,700,379 8,700,379 404,133 1.0691
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.