Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionAbner Herrman & Brock Llc
Latest Disclosed Ownership202,469 shares
Latest Disclosed Value $ 24,355
Abner Herrman & Brock Llc reports 2.10% increase in ownership of MRK / Merck & Co., Inc.

On April 7, 2026 - Abner Herrman & Brock Llc filed a 13F-HR form disclosing ownership of 202,469 shares of Merck & Co., Inc. (MX:MRK) valued at $24,355 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 6, 2026 disclosing 198,314 shares of Merck & Co., Inc.. This represents a change in shares of 2.10% 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)
2026-04-07 2026-03-31 13F MERCK COM 58933Y105 202,469 4,155 2.10 24 20.00 2.6915
2026-01-06 2025-12-31 13F MERCK COM 58933Y105 198,314 187,919 1,807.78 21 2.1318
2025-10-14 2025-09-30 13F MERCK COM 58933Y105 10,395 10,395 1 0.0898
2025-04-08 2025-03-31 13F MERCK COM 58933Y105 0 -36,461 -100.00 0 -100.00
2025-01-24 2024-12-31 13F MERCK COM 58933Y105 36,461 -98,749 -73.03 4 -80.00 0.4506
2024-10-08 2024-09-30 13F MERCK COM 58933Y105 135,210 492 0.37 15 -6.25 1.8531
2024-07-18 2024-06-30 13F MERCK COM 58933Y105 134,718 -3,831 -2.77 17 -11.11 2.1133
2024-04-09 2024-03-31 13F MERCK COM 58933Y105 138,549 -2,988 -2.11 18 20.00 2.2831
2024-01-09 2023-12-31 13F MERCK COM 58933Y105 141,537 -2,521 -1.75 15 7.14 2.1672
2023-10-10 2023-09-30 13F MERCK COM 58933Y105 144,058 -53,107 -26.94 15 -36.36 2.2728
2023-07-05 2023-06-30 13F MERCK COM 58933Y105 197,165 47 0.02 23 10.00 3.3373
2023-04-13 2023-03-31 13F MERCK COM 58933Y105 197,118 -82 -0.04 21 -4.76 3.1661
2023-01-04 2022-12-31 13F MERCK COM 58933Y105 197,200 -887 -0.45 22 -99.88 3.3608
2022-10-06 2022-09-30 13F MERCK COM 58933Y105 198,087 6,445 3.36 17,059 -2.36 3.1268
2022-07-13 2022-06-30 13F MERCK COM 58933Y105 191,642 1,808 0.95 17,472 12.17 3.0162
2022-04-07 2022-03-31 13F MERCK COM 58933Y105 189,834 189,834 15,576 2.1869
2021-07-09 2021-06-30 13F MERCK COM 58933Y105 0 -192,054 -100.00 0 -100.00
2021-04-09 2021-03-31 13F MERCK COM 58933Y105 192,054 -25,655 -11.78 14,805 -16.87 2.2379
2021-01-12 2020-12-31 13F MERCK COM 58933Y105 217,709 -16,783 -7.16 17,809 -8.44 2.7742
2020-10-08 2020-09-30 13F MERCK COM 58933Y105 234,492 -8,611 -3.54 19,451 3.47 3.2779
2020-07-10 2020-06-30 13F MERCK COM 58933Y105 243,103 -16,167 -6.24 18,799 -5.76 3.3759
2020-04-09 2020-03-31 13F MERCK COM 58933Y105 259,270 -13,933 -5.10 19,948 -19.72 4.5173
2020-01-10 2019-12-31 13F MERCK COM 58933Y105 273,203 -23,800 -8.01 24,848 -0.62 3.6980
2019-10-11 2019-09-30 13F MERCK COM 58933Y105 297,003 -14,186 -4.56 25,002 -4.18 3.6918
2019-07-19 2019-06-30 13F MERCK COM 58933Y105 311,189 -3,309 -1.05 26,093 -0.24 3.7412
2019-04-08 2019-03-31 13F MERCK COM 58933Y105 314,498 3,113 1.00 26,157 9.94 4.0341
2019-01-11 2018-12-31 13F MERCK COM 58933Y105 311,385 43,002 16.02 23,793 24.97 4.3440
2018-10-19 2018-09-30 13F MERCK COM 58933Y105 268,383 14,247 5.61 19,039 23.42 2.7209
2018-07-06 2018-06-30 13F MERCK COM 58933Y105 254,136 9,910 4.06 15,426 15.96 2.4045
2018-04-06 2018-03-31 13F MERCK COM 58933Y105 244,226 12,987 5.62 13,303 2.24 2.1079
2018-01-05 2017-12-31 13F MERCK COM 58933Y105 231,239 -25,558 -9.95 13,012 -20.87 2.1896
2017-10-06 2017-09-30 13F MERCK COM 58933Y105 256,797 12,002 4.90 16,443 4.81 2.9119
2017-07-14 2017-06-30 13F MERCK COM 58933Y105 244,795 2,474 1.02 15,689 1.90 2.9656
2017-04-21 2017-03-31 13F MERCK COM 58933Y105 242,321 -803 -0.33 15,397 5.36 3.0639
2017-01-06 2016-12-31 13F MERCK COM 58933Y105 243,124 -30,678 -11.20 14,614 -14.48 3.0732
2016-11-03 2016-09-30 13F MERCK COM 58933Y105 273,802 2,350 0.87 17,088 6.08 3.8813
2016-07-12 2016-06-30 13F MERCK COM 58933Y105 271,452 5,787 2.18 16,108 14.60 3.7489
2016-04-08 2016-03-31 13F MERCK COM 58933Y105 265,665 81,726 44.43 14,056 44.67 3.5348
2016-01-20 2015-12-31 13F MERCK COM 58933Y105 183,939 -4,650 -2.47 9,716 1.11 5.0100
2015-10-08 2015-09-30 13F MERCK COM 58933Y105 188,589 1,280 0.68 9,609 -10.60 5.1285
2015-07-10 2015-06-30 13F MERCK COM 58933Y105 187,309 4,029 2.20 10,748 2.02 5.3920
2015-04-10 2015-03-31 13F MERCK COM 58933Y105 183,280 60 0.03 10,535 1.25 5.3618
2015-01-07 2014-12-31 13F MERCK COM 58933Y105 183,220 -82,423 -31.03 10,405 -33.92 5.2767
2014-10-09 2014-09-30 13F MERCK COM 58933Y105 265,643 2,075 0.79 15,747 3.28 4.6277
2014-07-09 2014-06-30 13F MERCK COM 58933Y105 263,568 10,185 4.02 15,247 5.99 4.6032
2014-04-07 2014-03-31 13F MERCK COM 58933Y105 253,383 35,309 16.19 14,385 32.62 4.6104
2014-01-07 2013-12-31 13F MERCK COM 58933Y105 218,074 146,049 202.78 10,847 216.33 3.8448
2013-10-02 2013-09-30 13F MERCK COM 58933Y105 72,025 -22,046 -23.44 3,429 -21.53 2.2756
2013-07-08 2013-06-30 13F MERCK COM 58933Y105 94,071 94,071 4,370 1.8513
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.