Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionComerica Bank
Latest Disclosed Ownership932,997 shares
Latest Disclosed Value $ 98,207,272
Comerica Bank reports 3.48% decrease in ownership of MRK / Merck & Co., Inc.

On January 29, 2026 - Comerica Bank filed a 13F-HR form disclosing ownership of 932,997 shares of Merck & Co., Inc. (MX:MRK) valued at $98,207,272 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 966,673 shares of Merck & Co., Inc.. This represents a change in shares of -3.48% 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)
2026-01-29 2025-12-31 13F MERCK COM 58933Y105 932,997 -33,676 -3.48 98,207 21.05 0.3918
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 966,673 -38,732 -3.85 81,133 1.94 0.3052
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 1,005,405 -29,138 -2.82 79,588 -14.29 0.3089
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 1,034,543 -30,425 -2.86 92,861 -12.35 0.3900
2025-02-14 2024-12-31 13F/A-1 MERCK COM 58933Y105 1,064,968 -39,949 -3.62 105,943 -15.57 0.4272
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 1,064,968 -39,949 105,943 0.3549
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 1,104,917 2,892 0.26 125,474 -8.03 0.4963
2024-08-15 2024-06-30 13F MERCK COMMON 58933Y105 1,102,025 -578 -0.05 136,431 -6.23 0.5678
2024-05-16 2024-03-31 13F MERCK COMMON 58933Y105 1,102,603 -17,740 -1.58 145,489 19.12 0.6270
2024-02-14 2023-12-31 13F MERCK COMMON 58933Y105 1,120,343 -19,953 -1.75 122,140 4.04 0.5625
2023-11-21 2023-09-30 13F MERCK COMMON 58933Y105 1,140,296 -2,262,207 -66.49 117,394 0.6114
2023-08-22 2023-06-30 13F MERCK EQU 58933Y105 3,402,503 2,698,467 383.29 0 -100.00 0.0304
2023-01-26 2022-12-31 13F MERCK COM 58933Y105 704,036 2,457 0.35 78 -99.89 0.6045
2022-10-28 2022-09-30 13F MERCK COM 58933Y105 701,579 3,341 0.48 68,313 5.93 0.5759
2022-08-02 2022-06-30 13F MERCK COM 58933Y105 698,238 -15,147 -2.12 64,489 4.56 0.5296
2022-04-27 2022-03-31 13F MERCK COM 58933Y105 713,385 3,505 0.49 61,679 9.35 0.4477
2022-02-18 2021-12-31 13F MERCK COM 58933Y105 709,880 -25,787 -3.51 56,407 -5.51 0.4151
2021-11-22 2021-09-30 13F MERCK COM 58933Y105 735,667 -133,130 -15.32 59,699 -12.42 0.3595
2021-08-26 2021-06-30 13F MERCK COM 58933Y105 868,797 -2,400 -0.28 68,166 0.47 0.4070
2021-04-28 2021-03-31 13F MERCK & CO INC COM 58933Y105 871,197 -10,940 -1.24 67,848 -5.02 0.4046
2021-01-28 2020-12-31 13F MERCK & CO INC COM 58933Y105 882,137 -26,224 -2.89 71,436 -1.49 0.4533
2020-10-30 2020-09-30 13F MERCK & CO INC COM 58933Y105 908,361 11,150 1.24 72,515 2.59 0.5264
2020-07-31 2020-06-30 13F MERCK & CO INC COM 58933Y105 897,211 -1,964 -0.22 70,682 -3.46 0.5446
2020-05-01 2020-03-31 13F MERCK & CO INC COM 58933Y105 899,175 -16,241 -1.77 73,219 -7.53 0.6716
2020-02-07 2019-12-31 13F MERCK & CO INC COM 58933Y105 915,416 -27,996 -2.97 79,184 1.64 0.5998
2019-10-31 2019-09-30 13F MERCK & CO INC COM 58933Y105 943,412 5,598 0.60 77,907 1.41 0.6157
2019-08-02 2019-06-30 13F MERCK & CO INC COM 58933Y105 937,814 -100,092 -9.64 76,826 -8.41 0.6152
2019-05-02 2019-03-31 13F MERCK & CO INC COM 58933Y105 1,037,906 -34,875 -3.25 83,883 6.78 0.6799
2019-02-06 2018-12-31 13F MERCK & CO INC COM 58933Y105 1,072,781 -41,359 -3.71 78,559 -2.20 0.6673
2018-11-01 2018-09-30 13F MERCK & CO INC COM 58933Y105 1,114,140 -170,503 -13.27 80,330 0.00 0.6480
2018-08-01 2018-06-30 13F MERCK & CO INC COM 58933Y105 1,284,643 -45,975 -3.46 80,329 2.95 0.5617
2018-05-01 2018-03-31 13F MERCK & CO INC COM 58933Y105 1,330,618 -16,184 -1.20 78,028 -5.30 0.5575
2018-02-02 2017-12-31 13F MERCK & CO INC COM 58933Y105 1,346,802 -61,182 -4.35 82,398 6.97 0.5489
2017-11-06 2017-09-30 13F MERCK & CO INC COM 58933Y105 1,407,984 -22,753 -1.59 77,030 -13.95 0.5574
2017-08-03 2017-06-30 13F MERCK & CO INC COM 58933Y105 1,430,737 -29,696 -2.03 89,522 -2.05 0.6700
2017-05-03 2017-03-31 13F MERCK & CO INC COM 58933Y105 1,460,433 -27,582 -1.85 91,394 -1.48 0.6936
2017-02-08 2016-12-31 13F MERCK & CO INC COM 58933Y105 1,488,015 36,309 2.50 92,763 2.26 0.7339
2016-08-11 2016-06-30 13F MERCK & CO INC COM 58933Y105 1,451,706 -41,629 -2.79 90,717 8.21 0.7835
2016-05-11 2016-03-31 13F MERCK & CO INC COM 58933Y105 1,493,335 -17,063 -1.13 83,835 8.66 0.7486
2016-02-05 2015-12-31 13F MERCK & CO INC COM 58933Y105 1,510,398 -60,764 -3.87 77,151 -0.58 0.7571
2015-11-12 2015-09-30 13F MERCK & CO INC COM 58933Y105 1,571,162 -1,636,812 -51.02 77,601 -57.51 0.7349
2015-08-13 2015-06-30 13F MERCK & CO INC COM 58933Y105 3,207,974 1,546,165 93.04 182,630 91.20 0.7841
2015-05-15 2015-03-31 13F MERCK & CO INC COM 58933Y105 1,661,809 -1,693,157 -50.47 95,520 -49.87 0.8089
2015-02-13 2014-12-31 13F MERCK & CO INC COM 58933Y105 3,354,966 1,656,307 97.51 190,528 89.21 0.8238
2014-10-21 2014-09-30 13F MERCK & CO INC COM 58933Y105 1,698,659 -101,354 -5.63 100,697 -3.30 0.8891
2014-08-12 2014-06-30 13F MERCK & CO INC COM 58933Y105 1,800,013 -205,872 -10.26 104,130 -8.56 0.8854
2014-05-15 2014-03-31 13F MERCK & CO INC COM 58933Y105 2,005,885 68,857 3.55 113,874 17.46 0.8723
2014-02-11 2013-12-31 13F MERCK & CO INC COM 58933Y105 1,937,028 -369,339 -16.01 96,948 -11.71 0.7515
2013-11-12 2013-09-30 13F MERCK & CO INC COM 58933Y105 2,306,367 6,154 0.27 109,806 2.77 0.7642
2013-08-13 2013-06-30 13F/A-1 MERCK & CO INC COM 58933Y105 2,300,213 2,300,213 106,844 0.8711
2013-08-08 2013-06-30 13F MERCK & CO INC COM 58933Y105 18,253,320 847,861
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.