Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionNorthwest Bancshares, Inc.
Latest Disclosed Ownership55,622 shares
Latest Disclosed Value $ 6,690,770
Northwest Bancshares, Inc. reports 4.88% decrease in ownership of MRK / Merck & Co., Inc.

On May 12, 2026 - Northwest Bancshares, Inc. filed a 13F-HR form disclosing ownership of 55,622 shares of Merck & Co., Inc. (MX:MRK) valued at $6,690,770 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 58,477 shares of Merck & Co., Inc.. This represents a change in shares of -4.88% 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)
2026-05-12 2026-03-31 13F MERCK COM 58933Y105 55,622 -2,855 -4.88 6,691 8.69 1.3262
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 58,477 -7,418 -11.26 6,155 11.30 1.1895
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 65,895 4,084 6.61 5,531 13.04 0.9185
2025-08-07 2025-06-30 13F MERCK COM 58933Y105 61,811 2,614 4.42 4,893 -7.92 0.8529
2025-05-07 2025-03-31 13F MERCK COM 58933Y105 59,197 2,597 4.59 5,314 -5.63 0.9764
2025-02-12 2024-12-31 13F MERCK COM 58933Y105 56,600 -728 -1.27 5,631 -13.52 1.0423
2024-11-08 2024-09-30 13F MERCK COM 58933Y105 57,328 -5,561 -8.84 6,510 -16.38 1.1089
2024-08-08 2024-06-30 13F MERCK COM 58933Y105 62,889 -2,638 -4.03 7,786 -9.96 1.3262
2024-04-26 2024-03-31 13F MERCK COM 58933Y105 65,527 -2,785 -4.08 8,646 16.10 1.3643
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 68,312 847 1.26 7,447 7.23 1.3578
2023-10-27 2023-09-30 13F MERCK COM 58933Y105 67,465 500 0.75 6,946 -10.12 1.3295
2023-07-24 2023-06-30 13F MERCK COM 58933Y105 66,965 -554 -0.82 7,727 7.57 1.3971
2023-05-10 2023-03-31 13F MERCK COM 58933Y105 67,519 -862 -1.26 7,183 -5.31 1.3850
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 68,381 -4,302 -5.92 7,587 21.18 1.5234
2022-11-15 2022-09-30 13F MERCK COM 58933Y105 72,683 -909 -1.24 6,260 -6.69 1.4618
2022-08-16 2022-06-30 13F MERCK COM 58933Y105 73,592 -2,592 -3.40 6,709 7.33 1.5167
2022-04-29 2022-03-31 13F MERCK COM 58933Y105 76,184 1,262 1.68 6,251 8.86 1.1091
2022-02-09 2021-12-31 13F MERCK COM 58933Y105 74,922 -718 -0.95 5,742 1.07 1.1285
2021-10-13 2021-09-30 13F MERCK COM 58933Y105 75,640 3,661 5.09 5,681 1.50 1.2936
2021-08-06 2021-06-30 13F MERCK COM 58933Y105 71,979 5,183 7.76 5,597 8.68 1.2688
2021-04-23 2021-03-31 13F MERCK & CO. COM 58933Y105 66,796 8,388 14.36 5,150 7.79 1.2166
2021-02-05 2020-12-31 13F MERCK & CO. COM 58933Y105 58,408 47,476 434.28 4,778 426.79 1.2253
2020-10-20 2020-09-30 13F MERCK & CO. COM 58933Y105 10,932 -196 -1.76 907 5.34 0.2346
2020-08-07 2020-06-30 13F MERCK & CO. COM 58933Y105 11,128 1,859 20.06 861 20.76 0.2345
2020-05-05 2020-03-31 13F MERCK & CO. COM 58933Y105 9,269 -838 -8.29 713 -22.42 0.3544
2020-02-10 2019-12-31 13F MERCK COM 58933Y105 10,107 0 0.00 919 7.99 0.3547
2019-10-09 2019-09-30 13F MERCK COM 58933Y105 10,107 -75 -0.74 851 -0.35 0.3511
2019-07-17 2019-06-30 13F MERCK COM 58933Y105 10,182 95 0.94 854 1.79 0.3600
2019-04-24 2019-03-31 13F MERCK COM 58933Y105 10,087 83 0.83 839 9.82 0.3620
2019-02-08 2018-12-31 13F MERCK COM 58933Y105 10,004 -249 -2.43 764 5.09 0.3686
2018-10-02 2018-09-30 13F MERCK COM 58933Y105 10,253 300 3.01 727 20.36 0.3218
2018-08-09 2018-06-30 13F MERCK COM 58933Y105 9,953 0 0.00 604 11.44 0.2548
2018-05-09 2018-03-31 13F MERCK COM 58933Y105 9,953 0 0.00 542 -3.21 0.2226
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 9,953 9,953 560 0.2287
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.