Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionDearborn Partners Llc
Latest Disclosed Ownership35,043 shares
Latest Disclosed Value $ 4,215,296
Dearborn Partners Llc reports 84.08% decrease in ownership of 6MK / Merck & Co., Inc.

On May 12, 2026 - Dearborn Partners Llc filed a 13F-HR form disclosing ownership of 35,043 shares of Merck & Co., Inc. (BG:6MK) valued at $4,215,296 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 220,100 shares of Merck & Co., Inc.. This represents a change in shares of -84.08% 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)
2026-05-12 2026-03-31 13F Merck COM 58933Y105 35,043 -185,057 -84.08 4,215 -81.81 0.2205
2026-02-11 2025-12-31 13F Merck COM 58933Y105 220,100 -8,799 -3.84 23,168 20.59 1.1570
2025-11-10 2025-09-30 13F Merck COM 58933Y105 228,899 2,935 1.30 19,211 7.40 0.9008
2025-08-14 2025-06-30 13F Merck COM 58933Y105 225,964 2,694 1.21 17,887 -10.74 0.8467
2025-05-08 2025-03-31 13F Merck COM 58933Y105 223,270 -57,396 -20.45 20,041 -28.22 0.9620
2025-02-07 2024-12-31 13F Merck COM 58933Y105 280,666 -3,753 -1.32 27,921 -13.56 1.1699
2024-11-06 2024-09-30 13F Merck COM 58933Y105 284,419 -6,570 -2.26 32,299 -10.34 1.3110
2024-07-26 2024-06-30 13F Merck COM 58933Y105 290,989 -2,611 -0.89 36,024 -7.01 1.5576
2024-05-08 2024-03-31 13F Merck COM 58933Y105 293,600 -108,768 -27.03 38,741 -11.69 1.6631
2024-01-26 2023-12-31 13F Merck COM 58933Y105 402,368 -8,546 -2.08 43,866 3.69 1.5979
2023-11-01 2023-09-30 13F Merck COM 58933Y105 410,914 992 0.24 42,304 -10.56 1.6600
2023-08-03 2023-06-30 13F Merck COM 58933Y105 409,922 -98,752 -19.41 47,301 -12.60 1.8100
2023-05-04 2023-03-31 13F Merck COM 58933Y105 508,674 856 0.17 54,118 -3.95 2.1289
2023-02-02 2022-12-31 13F Merck COM 58933Y105 507,818 -4,637 -0.90 56,342 27.66 2.2740
2022-11-21 2022-09-30 13F/A-1 Merck COM 58933Y105 512,455 2,130 0.42 44,133 -5.14 1.9467
2022-10-25 2022-09-30 13F Merck COM 58933Y105 512,455 2,130 44,133 1.8195
2022-07-20 2022-06-30 13F Merck COM 58933Y105 510,325 -1,663 -0.32 46,526 10.75 1.9652
2022-05-04 2022-03-31 13F Merck COM 58933Y105 511,988 14,283 2.87 42,009 10.13 1.5931
2022-01-28 2021-12-31 13F Merck COM 58933Y105 497,705 3,076 0.62 38,144 2.67 1.3829
2021-10-27 2021-09-30 13F Merck COM 58933Y105 494,629 187,443 61.02 37,152 55.51 1.5090
2021-07-26 2021-06-30 13F Merck COM 58933Y105 307,186 1,129 0.37 23,890 1.25 0.9606
2021-04-29 2021-03-31 13F Merck COM 58933Y105 306,057 5,925 1.97 23,594 -3.90 1.0054
2021-01-27 2020-12-31 13F Merck COM 58933Y105 300,132 3,727 1.26 24,551 -0.15 1.1176
2020-10-20 2020-09-30 13F Merck COM 58933Y105 296,405 1,050 0.36 24,587 7.65 1.2242
2020-07-30 2020-06-30 13F Merck COM 58933Y105 295,355 -7,486 -2.47 22,840 -1.98 1.2342
2020-05-11 2020-03-31 13F Merck COM 58933Y105 302,841 8,707 2.96 23,301 -12.90 1.4452
2020-01-28 2019-12-31 13F Merck COM 58933Y105 294,134 16,751 6.04 26,751 14.57 1.3625
2019-10-29 2019-09-30 13F Merck COM 58933Y105 277,383 4,176 1.53 23,350 1.93 1.3501
2019-07-29 2019-06-30 13F Merck COM 58933Y105 273,207 9,902 3.76 22,908 4.61 1.3988
2019-05-01 2019-03-31 13F Merck COM 58933Y105 263,305 6,048 2.35 21,899 11.41 1.4615
2019-02-04 2018-12-31 13F Merck COM 58933Y105 257,257 3,143 1.24 19,657 9.04 1.5187
2018-10-24 2018-09-30 13F Merck COM 58933Y105 254,114 2,801 1.11 18,027 18.17 1.2628
2018-08-14 2018-06-30 13F Merck COM 58933Y105 251,313 -12,986 -4.91 15,255 5.97 1.1923
2018-05-01 2018-03-31 13F Merck COM 58933Y105 264,299 -8,794 -3.22 14,396 -6.32 1.1109
2018-02-02 2017-12-31 13F Merck COM 58933Y105 273,093 -8,576 -3.04 15,367 -14.79 1.1065
2017-11-13 2017-09-30 13F Merck COM 58933Y105 281,669 -592 -0.21 18,035 -0.30 1.3269
2017-08-09 2017-06-30 13F Merck COM 58933Y105 282,261 6,130 2.22 18,090 3.11 1.3365
2017-05-15 2017-03-31 13F Merck COM 58933Y105 276,131 11,028 4.16 17,545 12.42 1.3648
2017-01-26 2016-12-31 13F Merck COM 58933Y105 265,103 6,333 2.45 15,607 -3.36 1.3047
2016-10-24 2016-09-30 13F Merck COM 58933Y105 258,770 3,979 1.56 16,150 10.02 1.3625
2016-07-18 2016-06-30 13F Merck COM 58933Y105 254,791 8,217 3.33 14,679 12.52 1.2737
2016-04-19 2016-03-31 13F Merck COM 58933Y105 246,574 13,260 5.68 13,046 5.86 1.2131
2016-01-21 2015-12-31 13F Merck COM 58933Y105 233,314 22,942 10.91 12,324 18.61 1.1472
2015-10-19 2015-09-30 13F Merck COM 58933Y105 210,372 5,109 2.49 10,390 -11.09 1.0412
2015-08-13 2015-06-30 13F Merck COM 58933Y105 205,263 10,822 5.57 11,686 4.55 1.1266
2015-04-21 2015-03-31 13F Merck COM 58933Y105 194,441 194,441 0.00 11,177 0.9772
2015-01-28 2014-12-31 13F Merck COM 58933Y105 0 -165,259 -100.00 0 -100.00
2014-10-29 2014-09-30 13F Merck COM 58933Y105 165,259 6,907 4.36 9,797 6.94 0.9486
2014-07-23 2014-06-30 13F Merck COM 58933Y105 158,352 18,594 13.30 9,161 15.47 0.8985
2014-05-05 2014-03-31 13F Merck COM 58933Y105 139,758 20,777 17.46 7,934 33.23 0.8656
2014-02-14 2013-12-31 13F Merck COM 58933Y105 118,981 15,406 14.87 5,955 20.77 0.6945
2013-10-24 2013-09-30 13F Merck COM 58933Y105 103,575 13,192 14.60 4,931 17.46 0.6484
2013-07-22 2013-06-30 13F Merck COM 58933Y105 90,383 90,383 4,198 0.5965
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.