Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionSippican Capital Advisors
Latest Disclosed Ownership22,030 shares
Latest Disclosed Value $ 2,649,989
Sippican Capital Advisors reports 1.98% decrease in ownership of MRK / Merck & Co., Inc.

On April 23, 2026 - Sippican Capital Advisors filed a 13F-HR form disclosing ownership of 22,030 shares of Merck & Co., Inc. (MX:MRK) valued at $2,649,989 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 22,476 shares of Merck & Co., Inc.. This represents a change in shares of -1.98% 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)
2026-04-23 2026-03-31 13F Merck COM 58933Y105 22,030 -446 -1.98 2,650 12.01 1.8135
2026-01-23 2025-12-31 13F Merck COM 58933Y105 22,476 -650 -2.81 2,366 21.91 1.5202
2025-10-27 2025-09-30 13F Merck COM 58933Y105 23,126 943 4.25 1,941 10.48 1.2831
2025-07-25 2025-06-30 13F Merck COM 58933Y105 22,183 -85 -0.38 1,756 -12.11 1.2755
2025-04-28 2025-03-31 13F Merck COM 58933Y105 22,268 850 3.97 1,999 -6.20 1.5066
2025-01-23 2024-12-31 13F Merck COM 58933Y105 21,418 750 3.63 2,131 -9.25 1.5524
2024-10-28 2024-09-30 13F Merck COM 58933Y105 20,668 -10 -0.05 2,347 -8.28 1.6374
2024-08-06 2024-06-30 13F Merck COM 58933Y105 20,678 -3 -0.01 2,560 -6.20 2.0261
2024-05-02 2024-03-31 13F Merck COM 58933Y105 20,681 -2,284 -9.95 2,729 8.99 2.1223
2024-01-30 2023-12-31 13F Merck COM 58933Y105 22,965 1,732 8.16 2,504 14.55 1.9639
2023-10-24 2023-09-30 13F Merck COM 58933Y105 21,233 300 1.43 2,186 -9.52 1.9738
2023-08-15 2023-06-30 13F Merck COM 58933Y105 20,933 -603 -2.80 2,415 5.41 2.2274
2023-07-14 2023-03-31 13F Merck cs 58933Y105 21,536 -1,902 -8.12 2,291 -11.88 2.1904
2023-01-26 2022-12-31 13F Merck cs 58933Y105 23,438 -631 -2.62 2,600 25.42 2.4871
2022-10-17 2022-09-30 13F Merck cs 58933Y105 24,069 -815 -3.28 2,073 -8.64 2.1624
2022-07-19 2022-06-30 13F Merck cs 58933Y105 24,884 -140 -0.56 2,269 10.52 2.2516
2022-04-20 2022-03-31 13F Merck cs 58933Y105 25,024 576 2.36 2,053 9.55 1.7042
2022-01-19 2021-12-31 13F Merck cs 58933Y105 24,448 661 2.78 1,874 4.87 1.5922
2021-10-20 2021-09-30 13F Merck cs 58933Y105 23,787 1,420 6.35 1,787 2.76 1.5482
2021-07-22 2021-06-30 13F Merck cs 58933Y105 22,367 1,925 9.42 1,739 10.34 1.5128
2021-04-15 2021-03-31 13F Merck CS 58933Y105 20,442 2,129 11.63 1,576 5.21 1.4560
2021-01-21 2020-12-31 13F Merck cs 58933Y105 18,313 -2,437 -11.74 1,498 -12.96 1.6250
2020-10-23 2020-09-30 13F Merck cs 58933Y105 20,750 1,252 6.42 1,721 14.12 2.1397
2020-07-15 2020-06-30 13F MERCK & CO. INC COM Stock 58933Y105 19,498 -968 -4.73 1,508 -4.25 2.0325
2020-04-16 2020-03-31 13F MERCK & CO. INC COM Stock 58933Y105 20,466 -1,216 -5.61 1,575 -20.13 2.5653
2020-01-21 2019-12-31 13F MERCK & CO INC COM Stock 58933Y105 21,682 43 0.20 1,972 8.23 2.1939
2019-10-17 2019-09-30 13F MERCK & CO INC COM Stock 58933Y105 21,639 -1,004 -4.43 1,822 -4.05 2.2033
2019-07-17 2019-06-30 13F MERCK & CO INC COM Stock 58933Y105 22,643 -2,909 -11.38 1,899 -10.64 2.2380
2019-04-17 2019-03-31 13F MERCK & CO INC COM Stock 58933Y105 25,552 -3,000 -10.51 2,125 -2.61 2.5257
2019-01-16 2018-12-31 13F MERCK & CO INC COM Stock 58933Y105 28,552 319 1.13 2,182 2.39 2.9479
2018-11-13 2018-09-30 13F MERCK & CO INC COM Stock 58933Y105 28,233 -2,184 -7.18 2,131 15.44 2.4651
2018-07-17 2018-06-30 13F Merck cs 58933Y105 30,417 -74 -0.24 1,846 11.14 1.8452
2018-04-24 2018-03-31 13F Merck cs 58933Y105 30,491 2,336 8.30 1,661 4.86 1.7231
2018-01-17 2017-12-31 13F Merck cs 58933Y105 28,155 8,762 45.18 1,584 27.54 1.5454
2017-10-30 2017-09-30 13F Merck cs 58933Y105 19,393 3,289 20.42 1,242 20.35 1.2722
2017-07-18 2017-06-30 13F Merck cs 58933Y105 16,104 48 0.30 1,032 1.18 1.1204
2017-04-24 2017-03-31 13F Merck cs 58933Y105 16,056 -8 -0.05 1,020 7.82 1.0830
2017-02-09 2016-12-31 13F Merck cs 58933Y105 16,064 -2,927 -15.41 946 -20.17 0.9908
2016-10-19 2016-09-30 13F Merck cs 58933Y105 18,991 0 0.00 1,185 8.32 1.3522
2016-07-26 2016-06-30 13F Merck cs 58933Y105 18,991 -700 -3.55 1,094 4.99 1.3019
2016-05-09 2016-03-31 13F Merck cs 58933Y105 19,691 397 2.06 1,042 2.26 1.3265
2016-02-09 2015-12-31 13F Merck cs 58933Y105 19,294 175 0.92 1,019 7.94 1.2865
2015-11-04 2015-09-30 13F Merck cs 58933Y105 19,119 -275 -1.42 944 -14.49 1.1986
2015-08-11 2015-06-30 13F Merck cs 58933Y105 19,394 -354 -1.79 1,104 -2.73 1.1131
2015-05-14 2015-03-31 13F Merck cs 58933Y105 19,748 275 1.41 1,135 2.62 1.1559
2015-02-17 2014-12-31 13F Merck cs 58933Y105 19,473 -700 -3.47 1,106 -7.53 1.1042
2014-11-14 2014-09-30 13F Merck COM 58933Y105 20,173 20,173 1,196 1.2158
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.