Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionGriffin Asset Management, Inc.
Latest Disclosed Ownership109,973 shares
Latest Disclosed Value $ 13,228,602
Griffin Asset Management, Inc. reports 2.77% decrease in ownership of MRK / Merck & Co., Inc.

On April 30, 2026 - Griffin Asset Management, Inc. filed a 13F-HR form disclosing ownership of 109,973 shares of Merck & Co., Inc. (MX:MRK) valued at $13,228,602 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 113,106 shares of Merck & Co., Inc.. This represents a change in shares of -2.77% 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)
2026-04-30 2026-03-31 13F MERCK COM 58933Y105 109,973 -3,133 -2.77 13,229 11.11 1.4920
2026-02-06 2025-12-31 13F MERCK COM 58933Y105 113,106 6,657 6.25 11,905 33.25 1.2881
2025-10-16 2025-09-30 13F MERCK COM 58933Y105 106,449 -572 -0.53 8,934 5.47 1.0039
2025-07-25 2025-06-30 13F MERCK COM 58933Y105 107,021 -1,345 -1.24 8,472 -12.90 1.0004
2025-04-16 2025-03-31 13F MERCK COM 58933Y105 108,366 423 0.39 9,727 -9.42 1.1908
2025-01-22 2024-12-31 13F MERCK COM 58933Y105 107,943 -2,868 -2.59 10,738 -14.66 1.2617
2024-10-15 2024-09-30 13F MERCK COM 58933Y105 110,811 1,243 1.13 12,584 -7.23 1.4076
2024-07-23 2024-06-30 13F MERCK COM 58933Y105 109,568 -956 -0.86 13,565 -6.99 1.5713
2024-04-17 2024-03-31 13F MERCK COM 58933Y105 110,524 -366 -0.33 14,584 20.63 1.7393
2024-01-19 2023-12-31 13F MERCK COM 58933Y105 110,890 1,792 1.64 12,089 7.64 1.5329
2023-10-19 2023-09-30 13F MERCK COM 58933Y105 109,098 -4,572 -4.02 11,232 -14.37 1.5963
2023-08-01 2023-06-30 13F MERCK COM 58933Y105 113,670 -6,194 -5.17 13,116 2.85 1.7755
2023-05-09 2023-03-31 13F MERCK COM 58933Y105 119,864 -1,589 -1.31 12,752 -5.37 1.7818
2023-01-20 2022-12-31 13F MERCK COM 58933Y105 121,453 -5,424 -4.28 13,475 23.32 2.0321
2022-10-19 2022-09-30 13F MERCK COM 58933Y105 126,877 28 0.02 10,927 -5.52 1.8153
2022-07-19 2022-06-30 13F MERCK COM 58933Y105 126,849 3,127 2.53 11,565 13.93 1.8453
2022-04-12 2022-03-31 13F MERCK COM 58933Y105 123,722 21,390 20.90 10,151 29.43 1.3152
2022-01-28 2021-12-31 13F MERCK COM 58933Y105 102,332 2,145 2.14 7,843 4.23 0.9741
2021-11-05 2021-09-30 13F MERCK COM 58933Y105 100,187 -18,239 -15.40 7,525 -18.30 0.9625
2021-07-28 2021-06-30 13F Merck COM 58933Y105 118,426 1,227 1.05 9,210 1.94 1.1103
2021-05-04 2021-03-31 13F Merck COM 58933Y105 117,199 2,338 2.04 9,035 -3.84 1.1550
2021-01-27 2020-12-31 13F Merck COM 58933Y105 114,861 11,088 10.68 9,396 9.15 1.2459
2020-11-12 2020-09-30 13F Merck COM 58933Y105 103,773 -18,528 -15.15 8,608 -8.99 1.3235
2020-08-18 2020-06-30 13F Merck COM 58933Y105 122,301 1,886 1.57 9,458 2.08 1.5131
2020-05-18 2020-03-31 13F Merck COM 58933Y105 120,415 9,244 8.32 9,265 -8.37 1.7545
2020-02-11 2019-12-31 13F Merck COM 58933Y105 111,171 -1,198 -1.07 10,111 6.89 1.4173
2019-11-05 2019-09-30 13F Merck COM 58933Y105 112,369 -972 -0.86 9,459 -0.47 1.4690
2019-08-19 2019-06-30 13F Merck COM 58933Y105 113,341 -3,670 -3.14 9,504 -2.34 1.2093
2019-05-08 2019-03-31 13F Merck COM 58933Y105 117,011 -6,291 -5.10 9,732 3.29 1.3765
2019-03-01 2018-12-31 13F Merck COM 58933Y105 123,302 -219 -0.18 9,422 7.52 1.5901
2018-11-19 2018-09-30 13F Merck COM 58933Y105 123,521 4,241 3.56 8,763 21.04 1.2897
2018-08-15 2018-06-30 13F Merck COM 58933Y105 119,280 -258 -0.22 7,240 11.20 1.3137
2018-05-16 2018-03-31 13F Merck COM 58933Y105 119,538 3,737 3.23 6,511 -0.08 1.1850
2018-02-20 2017-12-31 13F Merck COM 58933Y105 115,801 -1,907 -1.62 6,516 -13.55 1.1595
2017-11-15 2017-09-30 13F Merck COM 58933Y105 117,708 9,807 9.09 7,537 8.99 1.3610
2017-08-29 2017-06-30 13F Merck COM 58933Y105 107,901 -12,043 -10.04 6,915 9.16 1.8484
2016-02-17 2015-12-31 13F Merck COM 58933Y105 119,944 -3,848 -3.11 6,335 3.61 2.6641
2015-11-12 2015-09-30 13F Merck COM 58933Y105 123,792 -4,015 -3.14 6,114 -15.97 2.5427
2015-08-05 2015-06-30 13F Merck COM 58933Y105 127,807 -10,357 -7.50 7,276 -8.39 2.7919
2015-04-27 2015-03-31 13F Merck COM 58933Y105 138,164 -2,225 -1.58 7,942 -0.39 2.3058
2015-01-12 2014-12-31 13F Merck COM 58933Y105 140,389 -2,574 -1.80 7,973 -5.92 2.1191
2014-11-03 2014-09-30 13F Merck COM 58933Y105 142,963 12,855 9.88 8,475 12.59 2.5297
2014-08-06 2014-06-30 13F Merck COM 58933Y105 130,108 3,727 2.95 7,527 4.91 2.3540
2014-04-14 2014-03-31 13F Merck COM 58933Y105 126,381 -21,652 -14.63 7,175 -3.16 2.3278
2014-01-29 2013-12-31 13F Merck COM 58933Y105 148,033 352 0.24 7,409 5.38 2.3943
2013-11-01 2013-09-30 13F Merck COM 58933Y105 147,681 -3,199 -2.12 7,031 0.33 2.2967
2013-08-21 2013-06-30 13F Merck COM 58933Y105 150,880 150,880 7,008 2.5354
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.