Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionWASHINGTON TRUST Co
Latest Disclosed Ownership34,430 shares
Latest Disclosed Value $ 4,141,559
WASHINGTON TRUST Co reports 18.72% increase in ownership of 6MK / Merck & Co., Inc.

On April 6, 2026 - WASHINGTON TRUST Co filed a 13F-HR form disclosing ownership of 34,430 shares of Merck & Co., Inc. (BG:6MK) valued at $4,141,559 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 29,001 shares of Merck & Co., Inc.. This represents a change in shares of 18.72% 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)
2026-04-06 2026-03-31 13F MERCK Equities 58933Y105 34,430 5,429 18.72 4,142 35.68 0.1347
2026-02-10 2025-12-31 13F MERCK Equities 58933Y105 29,001 -876 -2.93 3,053 21.74 0.0970
2025-11-12 2025-09-30 13F MERCK Equities 58933Y105 29,877 517 1.76 2,508 7.87 0.0823
2025-08-08 2025-06-30 13F MERCK Equities 58933Y105 29,360 630 2.19 2,324 -9.85 0.0822
2025-04-25 2025-03-31 13F MERCK COM 58933Y105 28,730 -2,690 -8.56 2,579 -17.50 0.0988
2025-01-30 2024-12-31 13F Merck COM 58933Y105 31,420 311 1.00 3,126 -11.52 0.1121
2024-10-25 2024-09-30 13F Merck COM 58933Y105 31,109 -1,980 -5.98 3,533 -13.77 0.1238
2024-07-15 2024-06-30 13F Merck COM 58933Y105 33,089 -1,514 -4.38 4,096 -10.27 0.1498
2024-04-23 2024-03-31 13F Merck COM 58933Y105 34,603 108 0.31 4,566 21.41 0.1677
2024-01-18 2023-12-31 13F Merck COM 58933Y105 34,495 -810 -2.29 3,761 3.47 0.1488
2023-10-18 2023-09-30 13F Merck COM 58933Y105 35,305 -249 -0.70 3,635 -11.41 0.1599
2023-07-27 2023-06-30 13F Merck COM 58933Y105 35,554 -681 -1.88 4,103 6.41 0.1730
2023-05-10 2023-03-31 13F/A-1 Merck COM 58933Y105 36,235 892 2.52 3,855 -1.68 0.1737
2023-05-04 2023-03-31 13F Merck COM 58933Y105 36 -35,307 4 0.1626
2023-07-27 2022-12-31 13F/A-1 Merck COM 58933Y105 35,343 -585 -1.63 3,921 26.69 0.1827
2023-02-08 2022-12-31 13F Merck COM 58933Y105 35,343 -585 4 0.0002
2022-10-14 2022-09-30 13F Merck COM 58933Y105 35,928 717 2.04 3,095 -3.58 0.1559
2022-07-25 2022-06-30 13F Merck COM 58933Y105 35,211 1,188 3.49 3,210 15.01 0.1507
2022-05-05 2022-03-31 13F Merck COM 58933Y105 34,023 576 1.72 2,791 8.90 0.1104
2022-02-09 2021-12-31 13F/A-1 Merck COM 58933Y105 33,447 -9,878 -22.80 2,563 -21.24 0.0962
2022-02-09 2021-12-31 13F Merck COM 58933Y105 33,447 -9,878 2,563 0.0897
2021-11-09 2021-09-30 13F Merck COM 58933Y105 43,325 -822 -1.86 3,254 -5.21 0.0917
2021-08-05 2021-06-30 13F Merck COM 58933Y105 44,147 -856 -1.90 3,433 -1.07 0.0968
2021-04-28 2021-03-31 13F Merck COM 58933Y105 45,003 -196 -0.43 3,470 -6.11 0.1065
2021-02-09 2020-12-31 13F Merck COM 58933Y105 45,199 411 0.92 3,696 -0.51 0.1193
2020-11-05 2020-09-30 13F Merck COM 58933Y105 44,788 -1,407 -3.05 3,715 5.27 0.1372
2020-08-04 2020-06-30 13F Merck COM 58933Y105 46,195 -24,891 -35.02 3,529 -35.47 0.1466
2020-05-07 2020-03-31 13F Merck COM 58933Y105 71,086 2,301 3.35 5,469 -12.58 0.2607
2020-02-12 2019-12-31 13F Merck COM 58933Y105 68,785 6,293 10.07 6,256 15.51 0.2465
2019-11-06 2019-09-30 13F Merck COM 58933Y105 62,492 -317 -0.50 5,416 2.83 0.2899
2019-08-07 2019-06-30 13F Merck COM 58933Y105 62,809 -177 -0.28 5,267 6.97 0.2884
2019-05-13 2019-03-31 13F MERCK COM 58933Y105 62,986 -6,686 -9.60 4,924 -7.51 0.2755
2019-02-11 2018-12-31 13F MERCK COM 58933Y105 69,672 -5,865 -7.76 5,324 -0.63 0.3386
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 75,537 -331 -0.44 5,358 16.35 0.2868
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 75,868 29,362 63.14 4,605 81.80 0.2467
2018-05-10 2018-03-31 13F MERCK COMMON STOCK 58933Y105 46,506 -322 -0.69 2,533 -3.87 0.1484
2018-02-05 2017-12-31 13F MERCK COMMON STOCK 58933Y105 46,828 427 0.92 2,635 -11.31 0.1483
2017-10-31 2017-09-30 13F MERCK COMMON STOCK 58933Y105 46,401 1,751 3.92 2,971 3.81 0.1767
2017-08-03 2017-06-30 13F MERCK COMMON STOCK 58933Y105 44,650 1,224 2.82 2,862 3.70 0.1744
2017-05-01 2017-03-31 13F MERCK COMMON STOCK 58933Y105 43,426 -545 -1.24 2,760 6.60 0.1749
2017-02-08 2016-12-31 13F MERCK COMMON STOCK 58933Y105 43,971 239 0.55 2,589 -5.13 0.1676
2016-11-03 2016-09-30 13F MERCK COMMON STOCK 58933Y105 43,732 -8,774 -16.71 2,729 -9.79 0.1795
2016-08-11 2016-06-30 13F MERCK COMMON STOCK 58933Y105 52,506 -5,134 -8.91 3,025 -0.79 0.2044
2016-05-05 2016-03-31 13F MERCK COMMON STOCK 58933Y105 57,640 -1,711 -2.88 3,049 -2.74 0.2034
2016-02-12 2015-12-31 13F MERCK COMMON STOCK 58933Y105 59,351 -7,951 -11.81 3,135 -5.71 0.2142
2015-11-12 2015-09-30 13F MERCK COMMON STOCK 58933Y105 67,302 1,164 1.76 3,325 -11.69 0.2401
2015-08-07 2015-06-30 13F MERCK COMMON STOCK 58933Y105 66,138 -838 -1.25 3,765 -2.21 0.2481
2015-05-05 2015-03-31 13F MERCK COMMON STOCK 58933Y105 66,976 638 0.96 3,850 2.20 0.2556
2015-02-11 2014-12-31 13F MERCK COMMON STOCK 58933Y105 66,338 3,898 6.24 3,767 1.76 0.2589
2014-11-12 2014-09-30 13F MERCK COMMON STOCK 58933Y105 62,440 -449 -0.71 3,702 1.76 0.2713
2014-08-12 2014-06-30 13F MERCK COMMON STOCK 58933Y105 62,889 -311 -0.49 3,638 1.39 0.2666
2014-05-09 2014-03-31 13F MERCK COMMON STOCK 58933Y105 63,200 -461 -0.72 3,588 12.62 0.2699
2014-02-13 2013-12-31 13F MERCK COMMON STOCK 58933Y105 63,661 778 1.24 3,186 6.41 0.2427
2013-11-08 2013-09-30 13F MERCK COMMON STOCK 58933Y105 62,883 -634 -1.00 2,994 1.49 0.2399
2013-08-14 2013-06-30 13F MERCK COMMON STOCK 58933Y105 63,517 63,517 2,950 0.2490
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.