Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionElgethun Capital Management
Latest Disclosed Ownership14,677 shares
Latest Disclosed Value $ 1,765,517
Elgethun Capital Management reports 23.33% increase in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Elgethun Capital Management filed a 13F-HR form disclosing ownership of 14,677 shares of Merck & Co., Inc. (MX:MRK) valued at $1,765,517 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 11,901 shares of Merck & Co., Inc.. This represents a change in shares of 23.33% 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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 14,677 2,776 23.33 1,766 40.97 0.2920
2026-02-10 2025-12-31 13F MERCK COM 58933Y105 11,901 35 0.29 1,253 21.08 0.2164
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 11,866 -113 -0.94 1,034 9.07 0.1878
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 11,979 41 0.34 948 -11.48 0.1908
2025-05-09 2025-03-31 13F MERCK COM 58933Y105 11,938 -167 -1.38 1,072 -11.05 0.2394
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 12,105 49 0.41 1,204 -12.05 0.2923
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 12,056 -78 -0.64 1,369 -8.85 0.3214
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 12,134 -76 -0.62 1,502 -5.59 0.3787
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 12,210 5,224 74.78 1,592 109.07 0.4014
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 6,986 -98 -1.38 762 4.82 0.2157
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 7,084 4,355 159.58 727 131.21 0.2191
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 2,729 12 0.44 315 8.28 0.0949
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 2,717 13 0.48 291 -2.36 0.0921
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 2,704 42 1.58 298 29.69 0.1077
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 2,662 -37,744 -93.41 229 -93.80 0.0915
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 40,406 -534 -1.30 3,695 10.00 1.4329
2022-05-11 2022-03-31 13F MERCK COM 58933Y105 40,940 445 1.10 3,359 8.46 1.1383
2022-02-11 2021-12-31 13F MERCK COM 58933Y105 40,495 -2,228 -5.21 3,097 -3.49 1.0819
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 42,723 -791 -1.82 3,209 -5.17 1.1077
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 43,514 33,807 348.27 3,384 352.41 1.1642
2021-05-14 2021-03-31 13F MERCK & CO. COM 58933Y105 9,707 1,295 15.39 748 8.72 0.2911
2021-02-11 2020-12-31 13F MERCK & CO. COM 58933Y105 8,412 967 12.99 688 11.87 0.2938
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 7,445 0 0.00 615 20.35 0.3367
2020-08-13 2020-06-30 13F MERCK & CO. COM 58933Y105 7,445 70 0.95 511 -9.88 0.2971
2020-05-08 2020-03-31 13F MERCK & CO. COM 58933Y105 7,375 -1,906 -20.54 567 -32.82 0.3150
2020-02-10 2019-12-31 13F MERCK COM 58933Y105 9,281 -20 -0.22 844 7.79 0.4109
2019-11-08 2019-09-30 13F MERCK COM 58933Y105 9,301 650 7.51 783 8.00 0.4169
2019-08-08 2019-06-30 13F MERCK COM 58933Y105 8,651 0 0.00 725 0.69 0.3957
2019-05-08 2019-03-31 13F MERCK COM 58933Y105 8,651 50 0.58 720 10.43 0.4196
2019-02-11 2018-12-31 13F MERCK COM 58933Y105 8,601 -506 -5.56 652 0.31 0.4519
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 9,107 0 0.00 650 18.18 0.4217
2018-08-09 2018-06-30 13F MERCK COM 58933Y105 9,107 400 4.59 550 16.03 0.3896
2018-05-11 2018-03-31 13F MERCK COM 58933Y105 8,707 807 10.22 474 6.52 0.3316
2018-02-09 2017-12-31 13F MERCK COM 58933Y105 7,900 -54 -0.68 445 -12.57 0.3114
2017-11-13 2017-09-30 13F MERCK COM 58933Y105 7,954 0 0.00 509 -0.20 0.3738
2017-08-10 2017-06-30 13F MERCK COM 58933Y105 7,954 -131 -1.62 510 -0.78 0.3970
2017-05-11 2017-03-31 13F MERCK COM 58933Y105 8,085 0 0.00 514 7.98 0.4121
2017-02-09 2016-12-31 13F/A-1 MERCK COM 58933Y105 8,085 8,085 476 0.3720
2017-02-09 2016-12-31 13F MERCK COM 58933Y105 8,085 476 0.3720
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.