머크 앤 컴퍼니(Merck & Co., Inc.)
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionEastern Bank
Latest Disclosed Ownership194,563 shares
Latest Disclosed Value $ 23,403,984
Eastern Bank reports 8.76% decrease in ownership of MRK / Merck & Co., Inc.

On April 7, 2026 - Eastern Bank filed a 13F-HR form disclosing ownership of 194,563 shares of Merck & Co., Inc. (MX:MRK) valued at $23,403,984 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 213,237 shares of Merck & Co., Inc.. This represents a change in shares of -8.76% 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)
2026-04-07 2026-03-31 13F MERCK COM 58933Y105 194,563 -18,674 -8.76 23,404 4.27 0.3665
2026-01-14 2025-12-31 13F MERCK COM 58933Y105 213,237 -10,373 -4.64 22,445 19.60 0.3873
2025-10-27 2025-09-30 13F MERCK COM 58933Y105 223,610 -47,755 -17.60 18,768 -12.63 0.3334
2025-07-24 2025-06-30 13F MERCK COM 58933Y105 271,365 -12,160 -4.29 21,481 -15.59 0.4089
2025-05-08 2025-03-31 13F MERCK COM 58933Y105 283,525 -169,159 -37.37 25,449 -43.49 0.4983
2025-01-13 2024-12-31 13F Merck COM 58933Y105 452,684 -115,026 -20.26 45,033 -30.15 0.8368
2024-10-21 2024-09-30 13F Merck COM 58933Y105 567,710 340,168 149.50 64,469 128.87 1.1550
2024-07-23 2024-06-30 13F MERCK COMMON STOCKS 58933Y105 227,542 28,657 14.41 28,170 7.34 1.1378
2024-05-09 2024-03-31 13F MERCK COMMON STOCKS 58933Y105 198,885 -11,765 -5.59 26,243 14.27 1.0924
2024-01-25 2023-12-31 13F MERCK COMMON STOCKS 58933Y105 210,650 -343 -0.16 22,965 5.73 1.0426
2023-10-17 2023-09-30 13F MERCK COMMON STOCKS 58933Y105 210,993 -1,179 -0.56 21,722 -11.28 1.0792
2023-07-19 2023-06-30 13F MERCK COMMON STOCKS 58933Y105 212,172 31,278 17.29 24,483 27.21 1.1641
2023-04-19 2023-03-31 13F MERCK COMMON STOCKS 58933Y105 180,894 -74,222 -29.09 19,245 -32.01 0.9669
2023-01-24 2022-12-31 13F MERCK COMMON STOCKS 58933Y105 255,116 1,133 0.45 28,305 29.41 1.5106
2022-10-19 2022-09-30 13F MERCK COMMON STOCKS 58933Y105 253,983 3,297 1.32 21,873 -4.30 1.2486
2022-07-20 2022-06-30 13F MERCK COMMON STOCKS 58933Y105 250,686 146,360 140.29 22,855 167.00 1.2158
2022-04-21 2022-03-31 13F MERCK COMMON STOCKS 58933Y105 104,326 -23,551 -18.42 8,560 -12.66 0.3969
2022-01-26 2021-12-31 13F MERCK COMMON STOCKS 58933Y105 127,877 -1,816 -1.40 9,801 0.62 0.4275
2021-10-19 2021-09-30 13F MERCK COMMON STOCKS 58933Y105 129,693 -930 -0.71 9,741 -4.11 0.4705
2021-07-20 2021-06-30 13F MERCK COMMON STOCKS 58933Y105 130,623 -2,521 -1.89 10,159 -1.02 0.4981
2021-04-27 2021-03-31 13F MERCK COMMON STOCKS 58933Y105 133,144 -160,799 -54.70 10,264 -57.31 0.5545
2021-01-20 2020-12-31 13F MERCK COMMON STOCKS 58933Y105 293,943 237 0.08 24,045 -1.31 1.3463
2020-10-30 2020-09-30 13F MERCK COMMON STOCKS 58933Y105 293,706 5,955 2.07 24,363 9.49 1.4916
2020-09-01 2020-06-30 13F/A-1 MERCK COMMON STOCKS 58933Y105 287,751 -5,458 -1.86 22,252 -1.36 1.4474
2020-07-21 2020-06-30 13F MERCK COMMON STOCKS 58933Y105 287,751 -5,458 22,252 1,447,389.9887
2020-04-27 2020-03-31 13F MERCK COMMON STOCKS 58933Y105 293,209 -10,383 -3.42 22,559 -18.30 1.6795
2020-02-04 2019-12-31 13F MERCK COMMON STOCKS 58933Y105 303,592 2,945 0.98 27,612 9.10 1.6037
2019-11-04 2019-09-30 13F MERCK COMMON STOCKS 58933Y105 300,647 4,873 1.65 25,308 2.04 1.5785
2019-07-24 2019-06-30 13F MERCK COMMON STOCKS 58933Y105 295,774 -53,062 -15.21 24,801 -14.52 1.5776
2019-04-18 2019-03-31 13F MERCK COMMON STOCKS 58933Y105 348,836 8,161 2.40 29,013 11.46 1.9448
2019-01-18 2018-12-31 13F MERCK COMMON STOCKS 58933Y105 340,675 -370 -0.11 26,031 7.59 1.9442
2018-10-16 2018-09-30 13F MERCK COMMON STOCKS 58933Y105 341,045 -3,240 -0.94 24,194 15.77 1.5784
2018-07-18 2018-06-30 13F MERCK COMMON STOCKS 58933Y105 344,285 -2,192 -0.63 20,898 10.74 1.4278
2018-04-09 2018-03-31 13F MERCK COMMON STOCKS 58933Y105 346,477 27,392 8.58 18,872 5.11 1.3198
2018-01-22 2017-12-31 13F MERCK COMMON STOCKS 58933Y105 319,085 96,247 43.19 17,955 25.84 1.2034
2017-10-24 2017-09-30 13F MERCK COMMON STOCKS 58933Y105 222,838 -1,896 -0.84 14,268 -0.94 1.0104
2017-07-26 2017-06-30 13F MERCK COMMON STOCKS 58933Y105 224,734 830 0.37 14,403 1.24 1.0601
2017-04-17 2017-03-31 13F MERCK COMMON STOCKS 58933Y105 223,904 -17,377 -7.20 14,227 0.15 1.0737
2017-01-18 2016-12-31 13F MERCK COMMON STOCKS 58933Y105 241,281 -9,753 -3.89 14,205 -9.33 1.1054
2016-10-17 2016-09-30 13F MERCK COMMON STOCKS 58933Y105 251,034 -1,717 -0.68 15,667 7.60 1.2593
2016-07-15 2016-06-30 13F MERCK COMMON STOCKS 58933Y105 252,751 -1,732 -0.68 14,561 8.15 1.1762
2016-04-14 2016-03-31 13F MERCK COMMON STOCKS 58933Y105 254,483 4,372 1.75 13,464 1.92 1.0980
2016-01-20 2015-12-31 13F MERCK COMMON STOCKS 58933Y105 250,111 942 0.38 13,211 7.35 1.0998
2015-10-16 2015-09-30 13F MERCK COMMON STOCKS 58933Y105 249,169 345 0.14 12,306 -13.13 1.0729
2015-07-16 2015-06-30 13F MERCK COMMON STOCKS 58933Y105 248,824 229 0.09 14,166 -0.87 1.1441
2015-04-17 2015-03-31 13F MERCK COMMON STOCKS 58933Y105 248,595 -10,609 -4.09 14,290 -2.92 1.1445
2015-01-12 2014-12-31 13F MERCK COMMON STOCKS 58933Y105 259,204 1,670 0.65 14,720 -3.58 1.1682
2014-10-15 2014-09-30 13F MERCK COMMON STOCKS 58933Y105 257,534 2,143 0.84 15,266 3.33 1.2338
2014-07-16 2014-06-30 13F MERCK COMMON STOCKS 58933Y105 255,391 -150 -0.06 14,774 1.84 1.1964
2014-04-17 2014-03-31 13F MERCK COMMON STOCKS 58933Y105 255,541 -12,982 -4.83 14,507 7.94 1.2222
2014-01-21 2013-12-31 13F MERCK COMMON STOCKS 58933Y105 268,523 -48,296 -15.24 13,440 -10.89 1.1452
2013-10-18 2013-09-30 13F MERCK COMMON STOCKS 58933Y105 316,819 -5,456 -1.69 15,083 0.76 1.3833
2013-08-09 2013-06-30 13F MERCK COMMON STOCKS 58933Y105 322,275 322,275 14,969 1.3924
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.