Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionLedyard National Bank
Latest Disclosed Ownership73,445 shares
Latest Disclosed Value $ 8,834,699
Ledyard National Bank reports 1.62% decrease in ownership of MRK / Merck & Co., Inc.

On April 24, 2026 - Ledyard National Bank filed a 13F-HR form disclosing ownership of 73,445 shares of Merck & Co., Inc. (MX:MRK) valued at $8,834,699 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 74,654 shares of Merck & Co., Inc.. This represents a change in shares of -1.62% 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)
2026-04-24 2026-03-31 13F MERCK Com 58933Y105 73,445 -1,209 -1.62 8,835 12.42 0.4431
2026-01-21 2025-12-31 13F MERCK Com 58933Y105 74,654 -2,185 -2.84 7,858 21.85 0.6770
2025-11-05 2025-09-30 13F MERCK Com 58933Y105 76,839 -8,060 -9.49 6,449 -4.03 0.5777
2025-08-04 2025-06-30 13F MERCK Com 58933Y105 84,899 -13,942 -14.11 6,721 -24.25 0.6346
2025-04-23 2025-03-31 13F MERCK Com 58933Y105 98,841 -7,853 -7.36 8,872 -16.41 0.8777
2025-01-28 2024-12-31 13F MERCK Com 58933Y105 106,694 -15,237 -12.50 10,614 -23.35 0.9985
2024-10-21 2024-09-30 13F MERCK Com 58933Y105 121,931 -6,606 -5.14 13,846 -12.98 1.2662
2024-08-06 2024-06-30 13F MERCK Com 58933Y105 128,537 -11,085 -7.94 15,913 -13.63 1.5451
2024-05-09 2024-03-31 13F MERCK Com 58933Y105 139,622 -8,073 -5.47 18,423 14.42 1.7829
2024-02-05 2023-12-31 13F MERCK Com 58933Y105 147,695 614 0.42 16,102 6.34 1.6570
2023-11-08 2023-09-30 13F MERCK Com 58933Y105 147,081 -112 -0.08 15,142 -10.85 1.7238
2023-08-10 2023-06-30 13F MERCK Com 58933Y105 147,193 -1,642 -1.10 16,985 7.26 1.8502
2023-04-25 2023-03-31 13F MERCK Com 58933Y105 148,835 -2,363 -1.56 15,835 -5.61 1.8187
2023-02-06 2022-12-31 13F MERCK Com 58933Y105 151,198 -2,153 -1.40 16,775 27.03 1.9726
2022-10-18 2022-09-30 13F MERCK Com 58933Y105 153,351 1,138 0.75 13,206 -4.84 1.7169
2022-07-19 2022-06-30 13F MERCK Com 58933Y105 152,213 54,248 55.37 13,878 72.65 1.6759
2022-04-25 2022-03-31 13F MERCK Com 58933Y105 97,965 4,119 4.39 8,038 11.76 0.8040
2022-01-31 2021-12-31 13F MERCK Com 58933Y105 93,846 274 0.29 7,192 2.33 0.6886
2021-10-20 2021-09-30 13F MERCK Com 58933Y105 93,572 -831 -0.88 7,028 -4.28 0.7265
2021-07-27 2021-06-30 13F MERCK Com 58933Y105 94,403 -366 -0.39 7,342 0.49 0.7515
2021-04-27 2021-03-31 13F MERCK Com 58933Y105 94,769 4,605 5.11 7,306 -0.95 0.7870
2021-01-25 2020-12-31 13F MERCK Com 58933Y105 90,164 2,935 3.36 7,376 1.93 0.8425
2020-10-21 2020-09-30 13F MERCK Com 58933Y105 87,229 2,924 3.47 7,236 11.00 0.9149
2020-07-24 2020-06-30 13F MERCK Com 58933Y105 84,305 5,387 6.83 6,519 7.36 0.8687
2020-04-24 2020-03-31 13F MERCK Com 58933Y105 78,918 48,787 161.92 6,072 121.61 0.9269
2020-01-31 2019-12-31 13F MERCK Com 58933Y105 30,131 4,353 16.89 2,740 26.27 0.3324
2019-10-23 2019-09-30 13F MERCK Com 58933Y105 25,778 -555 -2.11 2,170 -1.72 0.2866
2019-07-26 2019-06-30 13F MERCK Com 58933Y105 26,333 -3,113 -10.57 2,208 -9.84 0.2954
2019-04-12 2019-03-31 13F MERCK Com 58933Y105 29,446 -7,615 -20.55 2,449 -13.52 0.3237
2019-01-29 2018-12-31 13F MERCK Com 58933Y105 37,061 -1,065 -2.79 2,832 4.70 0.3735
2018-10-24 2018-09-30 13F MERCK Com 58933Y105 38,126 201 0.53 2,705 17.51 0.3079
2018-07-11 2018-06-30 13F MERCK Com 58933Y105 37,925 126 0.33 2,302 11.80 0.2753
2018-04-16 2018-03-31 13F MERCK Com 58933Y105 37,799 -655 -1.70 2,059 -4.85 0.2504
2018-01-30 2017-12-31 13F MERCK Com 58933Y105 38,454 -596 -1.53 2,164 -13.44 0.2623
2017-10-10 2017-09-30 13F MERCK Com 58933Y105 39,050 2,655 7.29 2,500 7.16 0.3317
2017-07-14 2017-06-30 13F MERCK Com 58933Y105 36,395 -10,344 -22.13 2,333 -21.45 0.3345
2017-04-19 2017-03-31 13F MERCK Com 58933Y105 46,739 -50,651 -52.01 2,970 -48.20 0.4455
2017-02-02 2016-12-31 13F MERCK Com 58933Y105 97,390 -1,106 -1.12 5,734 -6.72 1.0191
2016-10-25 2016-09-30 13F MERCK Com 58933Y105 98,496 -235 -0.24 6,147 8.07 1.0974
2016-07-25 2016-06-30 13F MERCK Com 58933Y105 98,731 -12,331 -11.10 5,688 -3.20 1.0254
2016-04-14 2016-03-31 13F MERCK Com 58933Y105 111,062 3,653 3.40 5,876 3.56 1.0439
2016-01-25 2015-12-31 13F MERCK Com 58933Y105 107,409 56,033 109.06 5,674 123.56 1.0212
2015-10-19 2015-09-30 13F MERCK & COMPANY COMMON Com 58933Y105 51,376 0 0.00 2,538 -13.23 0.4883
2015-07-16 2015-06-30 13F MERCK & COMPANY COMMON Com 58933Y105 51,376 321 0.63 2,925 -0.31 0.5114
2015-04-15 2015-03-31 13F MERCK & COMPANY COMMON Com 58933Y105 51,055 327 0.64 2,934 1.84 0.5271
2015-01-16 2014-12-31 13F MERCK & COMPANY COMMON Com 58933Y105 50,728 -75 -0.15 2,881 -4.32 0.5306
2014-10-09 2014-09-30 13F MERCK & COMPANY COMMON Com 58933Y105 50,803 -2,732 -5.10 3,011 -2.78 0.5605
2014-07-08 2014-06-30 13F MERCK & COMPANY COMMON Com 58933Y105 53,535 -317 -0.59 3,097 1.31 0.7299
2014-04-11 2014-03-31 13F MERCK & COMPANY COMMON Com 58933Y105 53,852 -128 -0.24 3,057 13.18 0.5200
2014-01-14 2013-12-31 13F MERCK & COMPANY COMMON Com 58933Y105 53,980 -186 -0.34 2,701 4.73 0.4495
2013-10-08 2013-09-30 13F MERCK & COMPANY COMMON Com 58933Y105 54,166 793 1.49 2,579 4.03 0.4543
2013-07-30 2013-06-30 13F MERCK & COMPANY COMMON Com 58933Y105 53,373 53,373 2,479 0.4600
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.