Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionIpswich Investment Management Co., Inc.
Latest Disclosed Ownership46,912 shares
Latest Disclosed Value $ 5,642,992
Ipswich Investment Management Co., Inc. reports 0.11% decrease in ownership of MRK / Merck & Co., Inc.

On April 10, 2026 - Ipswich Investment Management Co., Inc. filed a 13F-HR form disclosing ownership of 46,912 shares of Merck & Co., Inc. (MX:MRK) valued at $5,642,992 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 46,962 shares of Merck & Co., Inc.. This represents a change in shares of -0.11% 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)
2026-04-10 2026-03-31 13F MERCK COM 58933Y105 46,912 -50 -0.11 5,643 14.14 1.3250
2026-01-16 2025-12-31 13F MERCK COM 58933Y105 46,962 275 0.59 4,943 26.16 1.1447
2025-10-08 2025-09-30 13F MERCK COM 58933Y105 46,687 -725 -1.53 3,918 4.40 0.9152
2025-07-16 2025-06-30 13F MERCK COM 58933Y105 47,412 -1,508 -3.08 3,753 -14.53 0.9055
2025-04-16 2025-03-31 13F MERCK COM 58933Y105 48,920 -2,858 -5.52 4,391 -14.74 1.0897
2025-02-03 2024-12-31 13F MERCK COM 58933Y105 51,778 -14,333 -21.68 5,151 -31.40 1.2392
2024-11-06 2024-09-30 13F MERCK COM 58933Y105 66,111 -360 -0.54 7,508 -8.77 1.7383
2024-07-16 2024-06-30 13F MERCK COM 58933Y105 66,471 0 0.00 8,229 -6.17 1.9261
2024-04-19 2024-03-31 13F MERCK COM 58933Y105 66,471 -100 -0.15 8,771 20.85 2.0544
2024-01-31 2023-12-31 13F MERCK COM 58933Y105 66,571 -255 -0.38 7,258 5.49 1.8349
2023-11-08 2023-09-30 13F MERCK COM 58933Y105 66,826 13,345 24.95 6,880 11.47 1.8781
2023-07-27 2023-06-30 13F MERCK COM 58933Y105 53,481 117 0.22 6,171 8.70 1.6244
2023-04-24 2023-03-31 13F MERCK COM 58933Y105 53,364 710 1.35 5,677 -2.81 1.5519
2023-02-01 2022-12-31 13F MERCK COM 58933Y105 52,654 -1,120 -2.08 5,842 26.13 1.6722
2022-10-11 2022-09-30 13F MERCK COM 58933Y105 53,774 -1,328 -2.41 4,631 -7.82 1.4741
2022-07-26 2022-06-30 13F MERCK COM 58933Y105 55,102 1,110 2.06 5,024 13.41 1.4456
2022-04-25 2022-03-31 13F/A-1 MERCK COM 58933Y105 53,992 1,065 2.01 4,430 9.22 1.1000
2022-04-12 2022-03-31 13F MERCK & CO. COM 58933Y105 53,992 1,065 4,430 1.1000
2022-01-24 2021-12-31 13F MERCK COM 58933Y105 52,927 -200 -0.38 4,056 1.65 0.9465
2021-10-07 2021-09-30 13F MERCK COM 58933Y105 53,127 1,227 2.36 3,990 -1.14 1.0212
2021-08-05 2021-06-30 13F MERCK & CO INC COM Stock 58933Y105 51,900 1,060 2.08 4,036 2.99 1.0318
2021-04-09 2021-03-31 13F MERCK & CO. COM 58933Y105 50,840 1,456 2.95 3,919 -3.00 1.1025
2021-02-05 2020-12-31 13F MERCK & CO. COM 58933Y105 49,384 -2,223 -4.31 4,040 -5.63 1.2126
2020-10-06 2020-09-30 13F MERCK & CO. COM 58933Y105 51,607 200 0.39 4,281 7.70 1.3717
2020-07-09 2020-06-30 13F MERCK & CO. COM 58933Y105 51,407 4,440 9.45 3,975 9.99 1.3691
2020-04-09 2020-03-31 13F MERCK & CO. COM 58933Y105 46,967 -7,410 -13.63 3,614 -26.93 1.4206
2020-01-08 2019-12-31 13F MERCK COM 58933Y105 54,377 -25 -0.05 4,946 7.99 1.4544
2019-10-08 2019-09-30 13F MERCK COM 58933Y105 54,402 0 0.00 4,580 0.39 1.4594
2019-07-11 2019-06-30 13F MERCK COM 58933Y105 54,402 -675 -1.23 4,562 -0.41 1.4567
2019-04-12 2019-03-31 13F MERCK COM 58933Y105 55,077 1,153 2.14 4,581 11.19 1.4974
2019-01-15 2018-12-31 13F MERCK COM 58933Y105 53,924 105 0.20 4,120 7.91 1.5103
2018-10-09 2018-09-30 13F MERCK COM 58933Y105 53,819 1,700 3.26 3,818 20.67 1.2909
2018-07-18 2018-06-30 13F MERCK COM 58933Y105 52,119 3,802 7.87 3,164 20.21 1.4541
2018-04-12 2018-03-31 13F MERCK COM 58933Y105 48,317 180 0.37 2,632 -2.84 1.1103
2018-01-16 2017-12-31 13F MERCK COM 58933Y105 48,137 0 0.00 2,709 -12.10 1.1469
2017-10-11 2017-09-30 13F MERCK COM 58933Y105 48,137 -45 -0.09 3,082 -0.19 1.3838
2017-07-21 2017-06-30 13F MERCK COM 58933Y105 48,182 2,490 5.45 3,088 6.37 1.4473
2017-04-12 2017-03-31 13F MERCK COM 58933Y105 45,692 -100 -0.22 2,903 7.68 1.2649
2017-01-10 2016-12-31 13F MERCK COM 58933Y105 45,792 0 0.00 2,696 -5.67 1.2200
2016-10-18 2016-09-30 13F MERCK COM 58933Y105 45,792 0 0.00 2,858 8.34 1.3975
2016-08-02 2016-06-30 13F MERCK COM 58933Y105 45,792 -554 -1.20 2,638 5.23 1.3051
2016-05-11 2016-03-31 13F MERCK & CO INC COM 58933Y105 46,346 675 1.48 2,507 3.94 1.1937
2016-01-13 2015-12-31 13F MERCK & CO INC COM 58933Y105 45,671 -140 -0.31 2,412 6.58 1.0877
2015-10-26 2015-09-30 13F MERCK & CO INC COM 58933Y105 45,811 990 2.21 2,263 -11.29 1.0775
2015-08-20 2015-06-30 13F MERCK & CO INC COM 58933Y105 44,821 600 1.36 2,551 0.39 1.1492
2015-04-08 2015-03-31 13F MERCK & CO INC COM 58933Y105 44,221 -400 -0.90 2,541 0.28 1.1136
2015-01-20 2014-12-31 13F MERCK & CO INC COM 58933Y105 44,621 -2,500 -5.31 2,534 -9.27 1.0795
2014-10-08 2014-09-30 13F MERCK & CO INC COM 58933Y105 47,121 -1,739 -3.56 2,793 -1.13 1.1884
2014-07-15 2014-06-30 13F MERCK & CO INC COM 58933Y105 48,860 1,739 3.69 2,825 5.61 1.0941
2014-04-15 2014-03-31 13F MERCK & CO INC COM 58933Y105 47,121 20 0.04 2,675 13.49 1.1511
2014-01-16 2013-12-31 13F MERCK & CO INC COM 58933Y105 47,101 0 0.00 2,357 5.08 0.9843
2013-10-25 2013-09-30 13F/A-1 MERCK & CO INC COM 58933Y105 47,101 -825 -1.72 2,243 0.76 1.0090
2013-10-21 2013-09-30 13F MERCK & CO INC COM 58933Y105 47,101 2,243
2013-07-17 2013-06-30 13F MERCK & CO INC COM 58933Y105 47,926 47,926 2,226 0.9602
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.