Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionThomasville National Bank
Latest Disclosed Ownership43,956 shares
Latest Disclosed Value $ 4,626,809
Thomasville National Bank reports 2.04% decrease in ownership of MRK / Merck & Co., Inc.

On January 26, 2026 - Thomasville National Bank filed a 13F-HR form disclosing ownership of 43,956 shares of Merck & Co., Inc. (MX:MRK) valued at $4,626,809 USD as of December 31, 2025. The entity filed a previous 13F-HR on October 10, 2025 disclosing 44,872 shares of Merck & Co., Inc.. This represents a change in shares of -2.04% 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)
2026-01-26 2025-12-31 13F MERCK & CO INC Common Stock 58933Y105 43,956 -916 -2.04 4,627 22.84 0.2868
2025-10-10 2025-09-30 13F MERCK & CO INC Common Stock 58933Y105 44,872 420 0.94 3,766 7.05 0.2371
2025-07-11 2025-06-30 13F MERCK & CO INC Common Stock 58933Y105 44,452 -1,710 -3.70 3,519 -15.09 0.2397
2025-04-16 2025-03-31 13F MERCK & CO INC Common Stock 58933Y105 46,162 -722 -1.54 4,144 -11.17 0.3031
2025-01-13 2024-12-31 13F MERCK & CO INC Common Stock 58933Y105 46,884 -612 -1.29 4,664 -13.52 0.3353
2024-10-11 2024-09-30 13F MERCK & CO INC Common Stock 58933Y105 47,496 -315 -0.66 5,394 -8.89 0.3996
2024-07-10 2024-06-30 13F MERCK & CO INC Common Stock 58933Y105 47,811 -216 -0.45 5,919 -6.60 0.4739
2024-04-10 2024-03-31 13F MERCK & CO INC Common Stock 58933Y105 48,027 -1,385 -2.80 6,337 17.66 0.5216
2024-01-11 2023-12-31 13F MERCK & CO INC Common Stock 58933Y105 49,412 -626 -1.25 5,387 4.56 0.4779
2023-10-10 2023-09-30 13F MERCK & CO INC Common Stock 58933Y105 50,038 -22,143 -30.68 5,151 -38.15 0.5068
2023-07-10 2023-06-30 13F MERCK & CO INC Common Stock 58933Y105 72,181 -2,687 -3.59 8,329 4.56 0.7951
2023-04-10 2023-03-31 13F MERCK & CO INC Common Stock 58933Y105 74,868 -1,169 -1.54 7,965 99,462.50 0.8214
2023-01-10 2022-12-31 13F MERCK & CO INC Common Stock 58933Y105 76,037 -212,208 -73.62 8 -99.97 0.9723
2022-10-03 2022-09-30 13F MERCK & CO INC Common Stock 58933Y105 288,245 1,787 0.62 24,824 -4.95 2.9759
2022-07-28 2022-06-30 13F/A-1 MERCK & CO INC Common Stock 58933Y105 286,458 436 0.15 26,117 11.29 2.8809
2022-07-11 2022-06-30 13F MERCK & CO INC Common Stock 58933Y105 285,870 -152 23,455 2.2664
2022-04-14 2022-03-31 13F MERCK & CO INC Common Stock 58933Y105 286,022 5,406 1.93 23,467 9.11 2.2513
2022-01-18 2021-12-31 13F MERCK & CO INC Common Stock 58933Y105 280,616 13,474 5.04 21,507 7.19 2.0567
2021-10-04 2021-09-30 13F MERCK & CO INC Common Stock 58933Y105 267,142 27,939 11.68 20,065 7.86 2.0797
2021-07-02 2021-06-30 13F MERCK & CO INC Common Stock 58933Y105 239,203 187,237 360.31 18,602 365.28 1.9709
2021-04-01 2021-03-31 13F MERCK & CO INC Common Stock 58933Y105 51,966 1,433 2.84 3,998 -3.29 0.7451
2021-01-04 2020-12-31 13F MERCK & CO INC Common Stock 58933Y105 50,533 835 1.68 4,134 0.27 0.5427
2020-10-01 2020-09-30 13F MERCK & CO INC Common Stock 58933Y105 49,698 -2,435 -4.67 4,123 2.26 0.6201
2020-07-01 2020-06-30 13F MERCK & CO INC Common Stock 58933Y105 52,133 2,039 4.07 4,032 -4.39 0.6257
2020-04-02 2020-03-31 13F/A-1 MERCK & CO INC Common Stock 58933Y105 50,094 -987 -1.93 4,217 -9.23 0.7033
2020-04-02 2020-03-31 13F MERCK & CO INC Common Stock 58933Y105 50,094 -987 4,217 416,655.9629
2020-01-07 2019-12-31 13F MERCK & CO INC Common Stock 58933Y105 51,081 987 1.97 4,646 10.17 0.7172
2019-10-02 2019-09-30 13F MERCK & CO INC Common Stock 58933Y105 50,094 201 0.40 4,217 0.81 0.7033
2019-07-01 2019-06-30 13F MERCK & CO INC Common Stock 58933Y105 49,893 12 0.02 4,183 0.82 0.7245
2019-05-16 2019-03-31 13F MERCK & CO INC Common Stock 58933Y105 49,881 -2,104 -4.05 4,149 4.46 0.7655
2019-01-17 2018-12-31 13F MERCK & CO INC Common Stock 58933Y105 51,985 -2,478 -4.55 3,972 2.80 0.8153
2018-10-25 2018-09-30 13F MERCK & CO INC Common Stock 58933Y105 54,463 363 0.67 3,864 17.66 0.6199
2018-07-11 2018-06-30 13F MERCK & CO INC Common Stock 58933Y105 54,100 -1,557 -2.80 3,284 8.31 0.5657
2018-04-20 2018-03-31 13F MERCK & CO INC Common Stock 58933Y105 55,657 2,435 4.58 3,032 1.24 0.5390
2018-02-05 2017-12-31 13F MERCK & CO INC Common Stock 58933Y105 53,222 -6,082 -10.26 2,995 -21.12 0.5615
2017-11-14 2017-09-30 13F MERCK & CO INC Common Stock 58933Y105 59,304 587 1.00 3,797 0.90 0.6298
2017-07-17 2017-06-30 13F MERCK & CO INC Common Stock 58933Y105 58,717 4,235 7.77 3,763 8.69 0.6882
2017-04-12 2017-03-31 13F MERCK & CO INC Common Stock 58933Y105 54,482 990 1.85 3,462 3.71 0.6888
2016-11-03 2016-09-30 13F MERCK & CO INC Common Stock 58933Y105 53,492 5,923 12.45 3,338 21.78 1.9525
2016-07-19 2016-06-30 13F MERCK COM 58933Y105 47,569 3,918 8.98 2,741 18.71 0.7214
2016-04-14 2016-03-31 13F MERCK & CO INC COM 58933Y105 43,651 2,186 5.27 2,309 5.48 0.6968
2016-01-14 2015-12-31 13F MERCK & CO INC COM 58933Y105 41,465 3,716 9.84 2,189 17.44 0.7753
2015-10-15 2015-09-30 13F MERCK & CO INC COM 58933Y105 37,749 -1,165 -2.99 1,864 -15.88 0.6803
2015-07-22 2015-06-30 13F MERCK & CO INC COM 58933Y105 38,914 3,860 11.01 2,216 9.98 0.7651
2015-04-14 2015-03-31 13F MERCK & CO INC COM 58933Y105 35,054 1,288 3.81 2,015 5.06 0.6901
2015-01-15 2014-12-31 13F MERCK & CO INC COM 58933Y105 33,766 814 2.47 1,918 -1.79 0.6856
2014-10-15 2014-09-30 13F MERCK & CO INC COM 58933Y105 32,952 -166 -0.50 1,953 1.93 0.7462
2014-07-16 2014-06-30 13F MERCK & CO INC COM 58933Y105 33,118 6,779 25.74 1,916 28.07 0.7004
2014-04-09 2014-03-31 13F MERCK & CO INC COM 58933Y105 26,339 137 0.52 1,496 14.11 0.6156
2014-02-04 2013-12-31 13F MERCK & CO INC COM 58933Y105 26,202 2,617 11.10 1,311 16.84 0.5773
2013-10-22 2013-09-30 13F MERCK & CO INC COM 58933Y105 23,585 79 0.34 1,122 2.84 0.5837
2013-07-10 2013-06-30 13F MERCK & CO INC COM 58933Y105 23,506 23,506 1,091 0.7176
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.