Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionBancorpSouth Bank
Latest Disclosed Ownership39,068 shares
Latest Disclosed Value $ 4,112,297
BancorpSouth Bank reports 0.80% increase in ownership of MRK / Merck & Co., Inc.

On January 30, 2026 - BancorpSouth Bank filed a 13F-HR form disclosing ownership of 39,068 shares of Merck & Co., Inc. (MX:MRK) valued at $4,112,297 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 38,759 shares of Merck & Co., Inc.. This represents a change in shares of 0.80% 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)
2026-01-30 2025-12-31 13F MERCK COM 58933Y105 39,068 309 0.80 4,112 26.41 0.2407
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 38,759 -603 -1.53 3,253 4.43 0.1974
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 39,362 307 0.79 3,116 -11.13 0.2051
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 39,055 -11,345 -22.51 3,506 -30.08 0.2504
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 50,400 -1,860 -3.56 5,014 -15.52 0.3397
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 52,260 -182 -0.35 5,935 -8.60 0.4089
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 52,442 127 0.24 6,492 -5.94 0.4870
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 52,315 363 0.70 6,903 21.88 0.5026
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 51,952 -38 -0.07 5,664 5.81 0.4600
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 51,990 -2,537 -4.65 5,352 -14.93 0.4707
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 54,527 -243 -0.44 6,292 7.98 0.5482
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 54,770 -568 -1.03 5,827 -5.10 0.5365
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 55,338 -592 -1.06 6,140 27.44 0.5670
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 55,930 45,556 439.14 4,817 409.20 0.4991
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 10,374 -1,187 -10.27 946 -0.21 0.1359
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 11,561 -300 -2.53 948 4.29 0.1180
2022-02-11 2021-12-31 13F MERCK COM 58933Y105 11,861 -140 -1.17 909 0.89 0.1133
2021-11-10 2021-09-30 13F MERCK COM 58933Y105 12,001 899 8.10 901 4.28 0.1257
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 11,102 -65 -0.58 864 0.35 0.1255
2021-05-11 2021-03-31 13F MERCK & CO. COM 58933Y105 11,167 -48,652 -81.33 861 -82.40 0.1307
2021-02-04 2020-12-31 13F MERCK & CO. COM 58933Y105 59,819 4,074 7.31 4,893 5.82 0.7672
2020-11-09 2020-09-30 13F MERCK & CO. COM 58933Y105 55,745 168 0.30 4,624 7.58 0.9096
2020-07-27 2020-06-30 13F MERCK & CO. COM 58933Y105 55,577 1,654 3.07 4,298 3.59 0.8870
2020-04-30 2020-03-31 13F MERCK & CO. COM 58933Y105 53,923 1,010 1.91 4,149 -13.78 1.0448
2020-02-04 2019-12-31 13F MERCK COM 58933Y105 52,913 2,237 4.41 4,812 12.80 0.8895
2019-11-06 2019-09-30 13F MERCK COM 58933Y105 50,676 1,538 3.13 4,266 3.54 0.4015
2019-07-30 2019-06-30 13F MERCK COM 58933Y105 49,138 2,808 6.06 4,120 6.90 0.3986
2019-05-02 2019-03-31 13F MERCK COM 58933Y105 46,330 347 0.75 3,854 9.68 0.3879
2019-02-07 2018-12-31 13F MERCK COM 58933Y105 45,983 856 1.90 3,514 9.78 0.4135
2018-10-25 2018-09-30 13F MERCK COM 58933Y105 45,127 368 0.82 3,201 17.81 0.2986
2018-08-09 2018-06-30 13F MERCK COM 58933Y105 44,759 -1,819 -3.91 2,717 7.09 0.2463
2018-05-03 2018-03-31 13F MERCK COM 58933Y105 46,578 6,077 15.00 2,537 11.32 0.2429
2018-02-12 2017-12-31 13F MERCK COM 58933Y105 40,501 40,501 2,279 0.2156
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.