Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionClark Capital Management Group, Inc.
Latest Disclosed Ownership640,272 shares
Latest Disclosed Value $ 77,018,333
Clark Capital Management Group, Inc. reports 3,493.40% increase in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - Clark Capital Management Group, Inc. filed a 13F-HR form disclosing ownership of 640,272 shares of Merck & Co., Inc. (MX:MRK) valued at $77,018,333 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 17,818 shares of Merck & Co., Inc.. This represents a change in shares of 3,493.40% 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 640,272 622,454 3,493.40 77,018 4,007.63 0.4753
2026-02-17 2025-12-31 13F MERCK COM 58933Y105 17,818 -905 -4.83 1,875 19.35 0.0115
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 18,723 554 3.05 1,571 9.25 0.0098
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 18,169 -3,875 -17.58 1,438 -27.30 0.0100
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 22,044 -359,592 -94.22 1,979 -94.79 0.0142
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 381,636 -267,827 -41.24 37,965 -48.52 0.2655
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 649,463 -475,240 -42.25 73,753 -47.03 0.5050
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 1,124,703 61,458 5.78 139,238 -0.75 1.0234
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 1,063,245 356,277 50.40 140,295 82.03 1.0452
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 706,968 253,428 55.88 77,074 65.07 0.6309
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 453,540 -453,604 -50.00 46,692 -55.39 0.4670
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 907,144 24,639 2.79 104,675 11.49 0.9352
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 882,505 -143,601 -13.99 93,890 -17.53 1.0507
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 1,026,106 49,059 5.02 113,847 35.30 1.0473
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 977,047 -88,806 -8.33 84,143 -13.41 1.1028
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 1,065,853 679,175 175.64 97,174 206.28 1.2750
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 386,678 9,253 2.45 31,727 9.68 0.3548
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 377,425 24,537 6.95 28,926 9.13 0.3549
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 352,888 -244,655 -40.94 26,505 -42.96 0.3625
2021-08-02 2021-06-30 13F MERCK COM 58933Y105 597,543 112,426 23.18 46,471 24.26 0.6525
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 485,117 242,288 99.78 37,398 88.28 0.5700
2021-01-26 2020-12-31 13F MERCK & CO. COM 58933Y105 242,829 -11,268 -4.43 19,863 -5.76 0.3280
2020-11-12 2020-09-30 13F MERCK & CO. COM 58933Y105 254,097 118 0.05 21,077 7.32 0.3972
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 253,979 -332,295 -56.68 19,640 -56.46 0.3672
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 586,274 -373,832 -38.94 45,108 -48.34 1.1472
2020-01-27 2019-12-31 13F MERCK COM 58933Y105 960,106 94,247 10.88 87,322 19.80 1.8298
2019-11-06 2019-09-30 13F MERCK COM 58933Y105 865,859 859,857 14,326.17 72,888 14,390.66 1.6540
2019-07-12 2019-06-30 13F MERCK COM 58933Y105 6,002 216 3.73 503 4.57 0.0106
2019-05-08 2019-03-31 13F MERCK COM 58933Y105 5,786 649 12.63 481 22.39 0.0115
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 5,137 417 8.83 393 17.31 0.0106
2019-05-08 2018-09-30 13F/A-1 MERCK COM 58933Y105 4,720 -173 -3.54 335 12.79 0.0085
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 6,044 -95 429
2019-05-08 2018-06-30 13F/A-1 MERCK COM 58933Y105 4,893 -405 -7.64 297 2.77 0.0085
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 6,139 841 373
2019-05-08 2018-03-31 13F/A-1 MERCK COM 58933Y105 5,298 -7,006 -56.94 289 -58.24 0.0091
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 6,949 -5,355 379
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 12,304 -474,009 -97.47 692 -97.78 0.0212
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 486,313 42,474 9.57 31,139 9.47 1.0493
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 443,839 128,299 40.66 28,445 41.88 1.1059
2017-05-11 2017-03-31 13F MERCK COM 58933Y105 315,540 302,690 2,355.56 20,049 2,551.98 0.8891
2017-02-08 2016-12-31 13F MERCK COM 58933Y105 12,850 0 0.00 756 -5.74 0.0393
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 12,850 -45 -0.35 802 7.94 0.0460
2016-08-15 2016-06-30 13F MERCK COM 58933Y105 12,895 -2,341 -15.36 743 -7.82 0.0481
2016-05-16 2016-03-31 13F MERCK & CO INC COM 58933Y105 15,236 1,375 9.92 806 10.11 0.0624
2016-02-16 2015-12-31 13F MERCK & CO INC COM 58933Y105 13,861 -4,362 -23.94 732 -18.67 0.0594
2015-11-03 2015-09-30 13F MERCK COM 58933Y105 18,223 -155,883 -89.53 900 -90.92 0.0803
2015-08-10 2015-06-30 13F MERCK & CO INC COM 58933Y105 174,106 91,786 111.50 9,912 109.47 0.9068
2015-05-07 2015-03-31 13F MERCK COM 58933Y105 82,320 -80,665 -49.49 4,732 -48.88 0.4300
2015-02-17 2014-12-31 13F MERCK & CO INC COM 58933Y105 162,985 -16,119 -9.00 9,256 -12.82 0.8465
2014-11-13 2014-09-30 13F MERCK & CO INC COM 58933Y105 179,104 47,141 35.72 10,617 39.08 0.9187
2014-08-04 2014-06-30 13F MERCK Common Stock 58933Y105 131,963 -35,842 -21.36 7,634 -19.86 0.6354
2014-05-13 2014-03-31 13F MERCK COM 58933Y105 167,805 37,789 29.06 9,526 46.40 0.8202
2014-02-06 2013-12-31 13F MERCK COM 58933Y105 130,016 -8,816 -6.35 6,507 -1.56 0.5405
2013-11-08 2013-09-30 13F MERCK Common Stock 58933Y105 138,832 8,000 6.11 6,610 8.77 0.5226
2013-08-08 2013-06-30 13F MERCK Common Stock 58933Y105 130,832 130,832 6,077 0.5596
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.