Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionWesbanco Bank Inc
Latest Disclosed Ownership282,430 shares
Latest Disclosed Value $ 33,973,526
Wesbanco Bank Inc reports 2.41% decrease in ownership of MRK / Merck & Co., Inc.

On April 21, 2026 - Wesbanco Bank Inc filed a 13F-HR form disclosing ownership of 282,430 shares of Merck & Co., Inc. (MX:MRK) valued at $33,973,526 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 289,400 shares of Merck & Co., Inc.. This represents a change in shares of -2.41% 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)
2026-04-21 2026-03-31 13F MERCK COMMON STOCK 58933Y105 282,430 -6,970 -2.41 33,974 11.53 0.4569
2026-02-03 2025-12-31 13F MERCK COMMON STOCK 58933Y105 289,400 -17,179 -5.60 30,462 18.39 0.8389
2025-11-06 2025-09-30 13F MERCK COMMON STOCK 58933Y105 306,579 -45,025 -12.81 25,731 -7.55 0.7157
2025-07-07 2025-06-30 13F MERCK COMMON STOCK 58933Y105 351,604 -4,855 -1.36 27,833 -13.01 0.8260
2025-04-14 2025-03-31 13F MERCK COMMON STOCK 58933Y105 356,459 -11,960 -3.25 31,996 -12.70 1.1106
2025-01-17 2024-12-31 13F MERCK COMMON STOCK 58933Y105 368,419 14,855 4.20 36,650 -8.72 1.2510
2024-10-11 2024-09-30 13F MERCK COMMON STOCK 58933Y105 353,564 4,827 1.38 40,151 -7.00 1.3620
2024-07-11 2024-06-30 13F MERCK COMMON STOCK 58933Y105 348,737 -3,736 -1.06 43,174 -7.17 1.6117
2024-04-23 2024-03-31 13F MERCK COMMON STOCK 58933Y105 352,473 113,178 47.30 46,509 78.28 1.7550
2024-02-16 2023-12-31 13F MERCK COMMON STOCK 58933Y105 239,295 -107,279 -30.95 26,088 -26.88 1.4775
2023-12-11 2023-09-30 13F MERCK COMMON STOCK 58933Y105 346,574 -1,828 -0.52 35,680 89,097.50 1.5568
2023-07-13 2023-06-30 13F MERCK COMMON STOCK 58933Y105 348,402 -31,846 -8.38 40 0.00 1.6900
2023-04-21 2023-03-31 13F MERCK COMMON STOCK 58933Y105 380,248 -11,359 -2.90 40 -6.98 1.7531
2023-01-18 2022-12-31 13F MERCK COMMON STOCK 58933Y105 391,607 111,069 39.59 43 -99.82 1.9390
2022-10-13 2022-09-30 13F MERCK COMMON STOCK 58933Y105 280,538 -136,877 -32.79 24,161 -36.51 1.6328
2022-07-18 2022-06-30 13F MERCK COMMON STOCK 58933Y105 417,415 -6,445 -1.52 38,055 9.42 1.6780
2022-04-25 2022-03-31 13F MERCK COMMON STOCK 58933Y105 423,860 -696 -0.16 34,778 6.88 1.3171
2022-02-02 2021-12-31 13F MERCK COMMON STOCK 58933Y105 424,556 -2,272 -0.53 32,538 1.49 1.1721
2021-10-12 2021-09-30 13F MERCK COMMON STOCK 58933Y105 426,828 -2,026 -0.47 32,059 -3.88 1.2302
2021-08-09 2021-06-30 13F MERCK COMMON STOCK 58933Y105 428,854 20,108 4.92 33,352 5.85 1.2430
2021-05-06 2021-03-31 13F MERCK COMMON STOCK 58933Y105 408,746 -14,136 -3.34 31,510 -10.17 1.2452
2020-11-13 2020-09-30 13F MERCK COMMON STOCK 58933Y105 422,882 17,646 4.35 35,078 11.94 1.6242
2020-07-14 2020-06-30 13F MERCK COMMON STOCK 58933Y105 405,236 4,656 1.16 31,337 1.67 1.5429
2020-05-12 2020-03-31 13F MERCK COMMON STOCK 58933Y105 400,580 4,437 1.12 30,821 -14.46 1.7864
2020-02-13 2019-12-31 13F MERCK COMMON STOCK 58933Y105 396,143 -681 -0.17 36,029 7.86 1.6468
2019-11-07 2019-09-30 13F MERCK COMMON STOCK 58933Y105 396,824 -1,843 -0.46 33,404 -0.07 1.6610
2019-08-13 2019-06-30 13F MERCK COMMON STOCK 58933Y105 398,667 3,984 1.01 33,428 1.83 1.6302
2019-05-09 2019-03-31 13F MERCK COMMON STOCK 58933Y105 394,683 -5,107 -1.28 32,826 7.46 1.6383
2019-02-05 2018-12-31 13F MERCK COMMON STOCK 58933Y105 399,790 -7,548 -1.85 30,548 5.71 1.8176
2018-11-09 2018-09-30 13F MERCK COMMON STOCK 58933Y105 407,338 -7,612 -1.83 28,897 14.73 1.4254
2018-08-08 2018-06-30 13F MERCK COMMON STOCK 58933Y105 414,950 2,156 0.52 25,187 12.02 1.3029
2018-05-18 2018-03-31 13F MERCK COMMON STOCK 58933Y105 412,794 75,831 22.50 22,484 18.58 1.1481
2018-02-01 2017-12-31 13F MERCK COMMON STOCK 58933Y105 336,963 -67,556 -16.70 18,961 -26.79 1.2846
2017-11-02 2017-09-30 13F MERCK COMMON STOCK 58933Y105 404,519 13,382 3.42 25,901 3.32 1.3502
2017-08-08 2017-06-30 13F MERCK COMMON STOCK 58933Y105 391,137 10,169 2.67 25,068 3.56 1.3656
2017-04-27 2017-03-31 13F MERCK COMMON STOCK 58933Y105 380,968 -29,076 -7.09 24,207 0.28 1.3419
2017-02-02 2016-12-31 13F MERCK COMMON STOCK 58933Y105 410,044 13,391 3.38 24,139 -2.49 1.3778
2016-11-09 2016-09-30 13F MERCK COMMON STOCK 58933Y105 396,653 -314 -0.08 24,756 8.25 1.4620
2016-08-09 2016-06-30 13F MERCK COMMON STOCK 58933Y105 396,967 -412 -0.10 22,870 8.78 1.3629
2016-05-12 2016-03-31 13F MERCK COMMON STOCK 58933Y105 397,379 -2,846 -0.71 21,025 -0.54 1.2487
2016-02-04 2015-12-31 13F MERCK COMMON STOCK 58933Y105 400,225 25,614 6.84 21,140 14.26 1.2497
2015-11-03 2015-09-30 13F MERCK COMMON STOCK 58933Y105 374,611 18,810 5.29 18,502 -8.65 1.1218
2015-08-05 2015-06-30 13F MERCK COMMON STOCK 58933Y105 355,801 -2,240 -0.63 20,255 -1.57 1.1270
2015-05-04 2015-03-31 13F MERCK COMMON STOCK 58933Y105 358,041 358,041 0.00 20,579 1.1351
2015-02-03 2014-12-31 13F MERCK COMMON STOCK 58933Y105 0 -363,111 -100.00 0 -100.00
2014-11-06 2014-09-30 13F MERCK COMMON STOCK 58933Y105 363,111 -5,827 -1.58 21,525 0.85 1.2091
2014-07-14 2014-06-30 13F MERCK COMMON STOCK 58933Y105 368,938 -7,724 -2.05 21,343 -0.19 1.1910
2014-05-02 2014-03-31 13F MERCK COMMON STOCK 58933Y105 376,662 -91,077 -19.47 21,383 -8.66 1.2163
2014-02-03 2013-12-31 13F MERCK COMMON STOCK 58933Y105 467,739 -36,676 -7.27 23,410 -2.52 1.3329
2013-11-05 2013-09-30 13F MERCK COMMON STOCK 58933Y105 504,415 438 0.09 24,015 2.59 1.4874
2013-08-14 2013-06-30 13F MERCK COMMON STOCK 58933Y105 503,977 503,977 23,409 1.5290
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.