Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionEstabrook Capital Management
Latest Disclosed Ownership98,244 shares
Latest Disclosed Value $ 11,817,771
Estabrook Capital Management reports 0.05% increase in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Estabrook Capital Management filed a 13F-HR form disclosing ownership of 98,244 shares of Merck & Co., Inc. (MX:MRK) valued at $11,817,771 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 98,193 shares of Merck & Co., Inc.. This represents a change in shares of 0.05% 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 COMMON 58933Y105 98,244 51 0.05 11,818 14.34 1.7246
2026-02-13 2025-12-31 13F MERCK COMMON 58933Y105 98,193 -1,507 -1.51 10,336 23.52 1.5176
2025-11-10 2025-09-30 13F MERCK COMMON 58933Y105 99,700 -655 -0.65 8,368 5.32 1.2197
2025-08-13 2025-06-30 13F MERCK COMMON 58933Y105 100,355 3,584 3.70 7,944 -8.54 1.2228
2025-05-14 2025-03-31 13F MERCK COMMON 58933Y105 96,771 -898 -0.92 8,686 -10.60 1.4033
2025-02-13 2024-12-31 13F MERCK COMMON 58933Y105 97,669 -663 -0.67 9,716 -12.99 1.4979
2024-11-13 2024-09-30 13F MERCK COMMON 58933Y105 98,332 -392 -0.40 11,167 -8.64 1.6650
2024-08-13 2024-06-30 13F MERCK COMMON 58933Y105 98,724 -2,140 -2.12 12,222 -8.17 1.8811
2024-05-14 2024-03-31 13F MERCK COMMON 58933Y105 100,864 -2,259 -2.19 13,309 18.39 2.0560
2024-02-13 2023-12-31 13F MERCK COMMON 58933Y105 103,123 -519 -0.50 11,242 5.37 1.8363
2023-11-13 2023-09-30 13F MERCK COMMON 58933Y105 103,642 -1,533 -1.46 10,670 -12.09 1.8785
2023-08-11 2023-06-30 13F MERCK COMMON 58933Y105 105,175 -766 -0.72 12,136 7.67 2.0226
2023-05-12 2023-03-31 13F MERCK COMMON 58933Y105 105,941 -1,090 -1.02 11,271 -5.09 1.9553
2023-02-13 2022-12-31 13F MERCK COMMON 58933Y105 107,031 -2,138 -1.96 11,875 26.32 2.0414
2022-11-14 2022-09-30 13F MERCK COMMON 58933Y105 109,169 -345 -0.32 9,402 -5.84 1.7482
2022-08-15 2022-06-30 13F MERCK COMMON 58933Y105 109,514 -3,032 -2.69 9,984 8.12 1.7116
2022-05-13 2022-03-31 13F MERCK COMMON 58933Y105 112,546 1,847 1.67 9,234 8.85 1.3573
2022-02-11 2021-12-31 13F MERCK COMMON 58933Y105 110,699 -1,256 -1.12 8,484 0.89 1.2034
2021-11-15 2021-09-30 13F MERCK COMMON 58933Y105 111,955 -2,156 -1.89 8,409 -5.25 1.3241
2021-08-13 2021-06-30 13F MERCK COMMON 58933Y105 114,111 1,051 0.93 8,874 1.82 1.3483
2021-05-14 2021-03-31 13F MERCK COMMON 58933Y105 113,060 -1,480 -1.29 8,716 -6.98 1.3423
2021-02-12 2020-12-31 13F MERCK COMMON 58933Y105 114,540 -3,090 -2.63 9,369 -3.98 1.5526
2020-11-13 2020-09-30 13F MERCK COMMON 58933Y105 117,630 -3,495 -2.89 9,757 4.17 1.7909
2020-08-13 2020-06-30 13F/A-1 MERCK COMMON 58933Y105 121,125 -3,744 -3.00 9,367 -2.51 1.7799
2020-08-13 2020-06-30 13F MERCK COMMON 58933Y105 124,869 9,607
2020-05-14 2020-03-31 13F MERCK COMMON 58933Y105 124,869 -4,853 -3.74 9,607 -18.57 2.0218
2020-02-13 2019-12-31 13F MERCK COMMON 58933Y105 129,722 -1,720 -1.31 11,798 6.63 1.7743
2019-11-13 2019-09-30 13F MERCK COMMON 58933Y105 131,442 -5,390 -3.94 11,065 -3.56 1.8450
2019-08-13 2019-06-30 13F MERCK COMMON 58933Y105 136,832 -4,371 -3.10 11,473 -2.30 1.8784
2019-05-13 2019-03-31 13F MERCK COMMON 58933Y105 141,203 766 0.55 11,744 9.44 1.9463
2019-02-14 2018-12-31 13F MERCK COMMON 58933Y105 140,437 -3,226 -2.25 10,731 5.29 1.9892
2018-11-13 2018-09-30 13F MERCK COMMON 58933Y105 143,663 -3,561 -2.42 10,191 14.04 1.5407
2018-08-14 2018-06-30 13F MERCK COMMON 58933Y105 147,224 -5,008 -3.29 8,936 7.77 1.4083
2018-05-14 2018-03-31 13F MERCK COMMON 58933Y105 152,232 -2,037 -1.32 8,292 -4.47 1.2995
2018-02-12 2017-12-31 13F MERCK COMMON 58933Y105 154,269 4,814 3.22 8,681 -9.29 1.3097
2017-11-09 2017-09-30 13F MERCK COMMON 58933Y105 149,455 -5,629 -3.63 9,570 -3.72 1.4865
2017-08-10 2017-06-30 13F MERCK COMMON 58933Y105 155,084 -4,685 -2.93 9,939 -2.09 1.5820
2017-05-12 2017-03-31 13F MERCK COMMON 58933Y105 159,769 -4,491 -2.73 10,152 4.99 1.5882
2017-02-14 2016-12-31 13F MERCK COMMON 58933Y105 164,260 -25,952 -13.64 9,670 -18.55 1.5151
2016-11-14 2016-09-30 13F MERCK COMMON 58933Y105 190,212 -4,754 -2.44 11,871 5.70 1.7441
2016-08-12 2016-06-30 13F MERCK COMMON 58933Y105 194,966 -15,021 -7.15 11,232 1.09 1.6824
2016-05-11 2016-03-31 13F MERCK COMMON 58933Y105 209,987 19,246 10.09 11,110 10.28 1.6448
2016-02-08 2015-12-31 13F MERCK COMMON 58933Y105 190,741 -9,700 -4.84 10,075 1.77 1.4573
2015-11-12 2015-09-30 13F MERCK COMMON 58933Y105 200,441 -5,877 -2.85 9,900 -15.72 1.4286
2015-08-11 2015-06-30 13F MERCK COMMON 58933Y105 206,318 -10,283 -4.75 11,746 -5.66 1.4535
2015-05-14 2015-03-31 13F MERCK COMMON 58933Y105 216,601 -5,933 -2.67 12,450 -1.48 1.4546
2015-02-11 2014-12-31 13F MERCK COMMON 58933Y105 222,534 -2,426 -1.08 12,638 -5.23 1.3932
2014-11-13 2014-09-30 13F MERCK COMMON 58933Y105 224,960 -4,944 -2.15 13,336 0.27 1.4273
2014-08-11 2014-06-30 13F MERCK COMMON 58933Y105 229,904 -53 -0.02 13,300 1.88 1.3650
2014-05-13 2014-03-31 13F MERCK COMMON 58933Y105 229,957 19,623 9.33 13,055 24.00 1.3289
2014-02-13 2013-12-31 13F MERCK COMMON 58933Y105 210,334 159,814 316.34 10,527 337.71 1.0824
2013-11-14 2013-09-30 13F MERCK COMMON 58933Y105 50,520 -300 -0.59 2,405 1.91 0.2625
2013-08-15 2013-06-30 13F MERCK COMMON 58933Y105 50,820 50,820 2,361 0.2499
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.