Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionBurke & Herbert Bank & Trust Co
Latest Disclosed Ownership21,278 shares
Latest Disclosed Value $ 2,559,530
Burke & Herbert Bank & Trust Co reports 0.08% decrease in ownership of MRK / Merck & Co., Inc.

On May 8, 2026 - Burke & Herbert Bank & Trust Co filed a 13F-HR form disclosing ownership of 21,278 shares of Merck & Co., Inc. (MX:MRK) valued at $2,559,530 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 21,296 shares of Merck & Co., Inc.. This represents a change in shares of -0.08% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-08 2026-03-31 13F MERCK COMMON STOCK 58933Y105 21,278 -18 -0.08 2,560 14.19 0.7073
2026-02-12 2025-12-31 13F MERCK COMMON STOCK 58933Y105 21,296 -1,100 -4.91 2,242 19.27 0.6191
2025-11-07 2025-09-30 13F MERCK COMMON 58933Y105 22,396 -1,519 -6.35 1,880 -0.74 0.4039
2025-07-31 2025-06-30 13F MERCK COMMON 58933Y105 23,915 467 1.99 1,893 -10.03 0.4241
2025-04-29 2025-03-31 13F MERCK COMMON 58933Y105 23,448 370 1.60 2,105 -8.32 0.5064
2025-01-31 2024-12-31 13F MERCK COMMON 58933Y105 23,078 -103 -0.44 2,296 -12.80 0.5444
2024-10-23 2024-09-30 13F MERCK COMMON 58933Y105 23,181 -166 -0.71 2,632 -8.93 0.6122
2024-07-16 2024-06-30 13F MERCK COMMON 58933Y105 23,347 6,824 41.30 2,890 32.57 0.7026
2024-04-15 2024-03-31 13F MERCK COMMON 58933Y105 16,523 -1,028 -5.86 2,180 13.96 1.6411
2024-01-10 2023-12-31 13F MERCK COMMON 58933Y105 17,551 -20 -0.11 1,913 5.81 1.3744
2023-10-16 2023-09-30 13F MERCK COMMON 58933Y105 17,571 -843 -4.58 1,809 -14.88 1.4633
2023-07-12 2023-06-30 13F MERCK COMMON 58933Y105 18,414 -25 -0.14 2,125 8.31 1.4389
2023-04-13 2023-03-31 13F MERCK COMMON 58933Y105 18,439 -62 -0.34 1,962 97,950.00 1.4417
2023-01-11 2022-12-31 13F MERCK COMMON 58933Y105 18,501 -250 -1.33 2 -99.88 1.5278
2022-11-14 2022-09-30 13F/A-1 MERCK COMMON 58933Y105 18,751 -790 -4.04 1,615 -9.32 1.3384
2022-10-12 2022-09-30 13F MERCK COMMON 58933Y105 18,751 -790 1,615 0.8069
2022-07-08 2022-06-30 13F MERCK COMMON 58933Y105 19,541 -606 -3.01 1,781 7.74 1.3426
2022-04-20 2022-03-31 13F MERCK COMMON 58933Y105 20,147 -969 -4.59 1,653 2.10 1.0506
2022-01-13 2021-12-31 13F MERCK COMMON 58933Y105 21,116 -388 -1.80 1,619 0.25 0.9493
2021-10-08 2021-09-30 13F MERCK COMMON 58933Y105 21,504 113 0.53 1,615 -2.94 1.0434
2021-07-14 2021-06-30 13F MERCK COMMON 58933Y105 21,391 306 1.45 1,664 2.40 1.0694
2021-04-12 2021-03-31 13F MERCK COMMON 58933Y105 21,085 -3,630 -14.69 1,625 -19.63 1.1130
2021-01-11 2020-12-31 13F MERCK COMMON 58933Y105 24,715 -554 -2.19 2,022 -3.53 1.4327
2020-10-06 2020-09-30 13F MERCK COMMON 58933Y105 25,269 -2,101 -7.68 2,096 -0.95 1.6484
2020-07-15 2020-06-30 13F MERCK COMMON STOCK 58933Y105 27,370 291 1.07 2,116 1.58 1.8370
2020-04-09 2020-03-31 13F MERCK COMMON STOCK 58933Y105 27,079 236 0.88 2,083 -14.67 2.1114
2020-01-08 2019-12-31 13F MERCK COMMON STOCK 58933Y105 26,843 3,591 15.44 2,441 24.73 1.8820
2019-10-08 2019-09-30 13F MERCK COMMON 58933Y105 23,252 -47 -0.20 1,957 0.20 1.7328
2019-07-16 2019-06-30 13F MERCK COMMON STOCK 58933Y105 23,299 -114 -0.49 1,953 0.31 1.7193
2019-04-09 2019-03-31 13F MERCK COMMON STOCK 58933Y105 23,413 0 0.00 1,947 8.83 1.7216
2019-01-15 2018-12-31 13F MERCK COMMON 58933Y105 23,413 35 0.15 1,789 7.90 1.7621
2018-10-10 2018-09-30 13F MERCK COMMON 58933Y105 23,378 0 0.00 1,658 16.84 1.4088
2018-07-06 2018-06-30 13F MERCK COMMON STOCK 58933Y105 23,378 -604 -2.52 1,419 8.65 1.2764
2018-04-11 2018-03-31 13F MERCK COMMON 58933Y105 23,982 0 0.00 1,306 -3.26 1.1747
2018-01-16 2017-12-31 13F MERCK COMMON 58933Y105 23,982 -102 -0.42 1,350 -12.45 1.1560
2017-10-13 2017-09-30 13F MERCK COMMON 58933Y105 24,084 -771 -3.10 1,542 -3.20 1.3938
2017-07-12 2017-06-30 13F MERCK COMMON 58933Y105 24,855 0 0.00 1,593 0.82 1.4501
2017-04-07 2017-03-31 13F MERCK COMMON STOCK 58933Y105 24,855 0 0.00 1,580 8.00 1.4149
2017-01-09 2016-12-31 13F MERCK COMMON STOCK 58933Y105 24,855 -45 -0.18 1,463 -5.86 1.3248
2016-10-05 2016-09-30 13F MERCK COMMON STOCK 58933Y105 24,900 85 0.34 1,554 8.75 1.4073
2016-07-27 2016-06-30 13F MERCK COMMON 58933Y105 24,815 -1,047 -4.05 1,429 4.46 1.2980
2016-04-14 2016-03-31 13F MERCK COMMON STOCK 58933Y105 25,862 1,059 4.27 1,368 4.43 1.3236
2016-01-11 2015-12-31 13F MERCK COMMON 58933Y105 24,803 -402 -1.59 1,310 5.22 1.3652
2015-10-13 2015-09-30 13F MERCK COMMON STOCK 58933Y105 25,205 178 0.71 1,245 -12.63 1.3998
2015-07-08 2015-06-30 13F MERCK COMMON 58933Y105 25,027 450 1.83 1,425 0.85 1.5172
2015-04-08 2015-03-31 13F MERCK COMMON 58933Y105 24,577 235 0.97 1,413 2.24 1.5372
2015-01-13 2014-12-31 13F MERCK COMMON STOCK 58933Y105 24,342 150 0.62 1,382 -3.69 1.3827
2014-10-07 2014-09-30 13F MERCK COMMON 58933Y105 24,192 -835 -3.34 1,435 -0.90 1.4024
2014-07-08 2014-06-30 13F MERCK COMMON 58933Y105 25,027 295 1.19 1,448 3.13 1.3272
2014-04-08 2014-03-31 13F MERCK COMMON STOCK 58933Y105 24,732 330 1.35 1,404 14.99 1.3806
2014-01-08 2013-12-31 13F MERCK COMMON STOCK 58933Y105 24,402 -301 -1.22 1,221 3.83 1.2152
2013-10-07 2013-09-30 13F MERCK COMMON 58933Y105 24,703 -63 -0.25 1,176 2.17 1.3232
2013-07-08 2013-06-30 13F MERCK COMMON STOCK 58933Y105 24,766 24,766 1,151 1.3444
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.