Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionSoutheast Asset Advisors Inc.
Latest Disclosed Ownership12,698 shares
Latest Disclosed Value $ 1,527,450
Southeast Asset Advisors Inc. reports 18.23% increase in ownership of MRK / Merck & Co., Inc.

On May 13, 2026 - Southeast Asset Advisors Inc. filed a 13F-HR form disclosing ownership of 12,698 shares of Merck & Co., Inc. (MX:MRK) valued at $1,527,450 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 10,740 shares of Merck & Co., Inc.. This represents a change in shares of 18.23% 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)
2026-05-13 2026-03-31 13F MERCK & CO INC COM 58933Y105 12,698 1,958 18.23 1,527 35.13 0.1674
2026-02-13 2025-12-31 13F MERCK & CO INC COM 58933Y105 10,740 -2,059 -16.09 1,130 5.21 0.1073
2025-11-07 2025-09-30 13F MERCK & CO INC COM 58933Y105 12,799 3,878 43.47 1,074 52.12 0.1170
2025-08-12 2025-06-30 13F MERCK & CO INC COM 58933Y105 8,921 513 6.10 706 -6.37 0.0839
2025-05-14 2025-03-31 13F MERCK & CO INC COM 58933Y105 8,408 745 9.72 755 -1.05 0.0925
2025-02-13 2024-12-31 13F MERCK & CO INC COM 58933Y105 7,663 8 0.10 762 -12.31 0.0935
2024-11-13 2024-09-30 13F MERCK & CO INC COM 58933Y105 7,655 6 0.08 869 -8.14 0.0962
2024-08-12 2024-06-30 13F MERCK & CO INC COM 58933Y105 7,649 -27 -0.35 947 -6.52 0.1138
2024-05-14 2024-03-31 13F MERCK & CO INC COM 58933Y105 7,676 -494 -6.05 1,013 13.71 0.1219
2024-02-13 2023-12-31 13F MERCK & CO INC COM 58933Y105 8,170 8 0.10 891 5.95 0.1181
2023-11-14 2023-09-30 13F MERCK & CO INC COM 58933Y105 8,162 -527 -6.07 840 -16.17 0.1181
2023-08-10 2023-06-30 13F MERCK & CO INC COM 58933Y105 8,689 7 0.08 1,003 8.56 0.1427
2023-05-12 2023-03-31 13F MERCK & CO INC COM 58933Y105 8,682 71 0.82 924 -3.35 0.1385
2023-02-09 2022-12-31 13F MERCK & CO INC COM 58933Y105 8,611 9 0.10 955 28.88 0.1517
2022-11-04 2022-09-30 13F MERCK & CO INC COM 58933Y105 8,602 42 0.49 741 -5.00 0.1260
2022-08-15 2022-06-30 13F MERCK & CO INC COM 58933Y105 8,560 8 0.09 780 11.11 0.1231
2022-05-13 2022-03-31 13F MERCK & CO INC COM 58933Y105 8,552 -216 -2.46 702 4.46 0.0932
2022-02-14 2021-12-31 13F MERCK & CO INC COM 58933Y105 8,768 2,806 47.06 672 50.00 0.0922
2021-11-15 2021-09-30 13F MERCK & CO INC COM 58933Y105 5,962 -249 -4.01 448 -7.25 0.0735
2021-08-13 2021-06-30 13F MERCK & CO INC COM 58933Y105 6,211 9 0.15 483 1.05 0.0791
2021-05-13 2021-03-31 13F MERCK & CO INC COM 58933Y105 6,202 8 0.13 478 -5.72 0.0858
2021-02-16 2020-12-31 13F MERCK & CO INC COM 58933Y105 6,194 7 0.11 507 -1.17 0.1006
2020-11-12 2020-09-30 13F MERCK & CO INC COM 58933Y105 6,187 -17 -0.27 513 6.88 0.1150
2020-08-14 2020-06-30 13F MERCK & CO INC COM 58933Y105 6,204 1,012 19.49 480 20.30 0.1190
2020-04-10 2020-03-31 13F MERCK & CO INC COM 58933Y105 5,192 7 0.14 399 -15.47 0.1165
2020-02-14 2019-12-31 13F MERCK & CO INC COM 58933Y105 5,185 6 0.12 472 8.26 0.1122
2019-11-14 2019-09-30 13F MERCK & CO INC COM 58933Y105 5,179 -170 -3.18 436 -2.90 0.1114
2019-08-14 2019-06-30 13F MERCK & CO INC COM 58933Y105 5,349 120 2.29 449 3.22 0.1177
2019-05-15 2019-03-31 13F MERCK & CO INC COM 58933Y105 5,229 -118 -2.21 435 6.36 0.1165
2019-02-13 2018-12-31 13F MERCK & CO INC COM 58933Y105 5,347 0 0.00 409 7.92 0.1223
2018-11-14 2018-09-30 13F MERCK & CO INC COM 58933Y105 5,347 0 0.00 379 16.62 0.1016
2018-08-13 2018-06-30 13F MERCK & CO INC COM 58933Y105 5,347 265 5.21 325 17.33 0.0935
2018-05-15 2018-03-31 13F MERCK & CO INC COM 58933Y105 5,082 -700 -12.11 277 -14.77 0.0821
2018-02-14 2017-12-31 13F MERCK & CO INC COM 58933Y105 5,782 354 6.52 325 -6.61 0.0983
2017-11-14 2017-09-30 13F MERCK & CO INC COM 58933Y105 5,428 0 0.00 348 0.00 0.1101
2017-08-14 2017-06-30 13F MERCK & CO INC COM 58933Y105 5,428 105 1.97 348 2.96 0.1130
2017-05-15 2017-03-31 13F MERCK & CO INC COM 58933Y105 5,323 -1,991 -27.22 338 -21.58 0.1056
2017-02-14 2016-12-31 13F MERCK & CO INC COM 58933Y105 7,314 14 0.19 431 -5.48 0.1360
2016-11-14 2016-09-30 13F MERCK & CO INC COM 58933Y105 7,300 616 9.22 456 18.44 0.1530
2016-08-12 2016-06-30 13F MERCK & CO INC COM 58933Y105 6,684 -379 -5.37 385 2.94 0.1267
2016-05-16 2016-03-31 13F MERCK & CO INC COM 58933Y105 7,063 17 0.24 374 0.54 0.1217
2016-02-16 2015-12-31 13F MERCK & CO INC COM 58933Y105 7,046 2,712 62.57 372 73.83 0.1265
2015-11-12 2015-09-30 13F MERCK & CO INC COM 58933Y105 4,334 0 0.00 214 -13.36 0.0813
2015-08-13 2015-06-30 13F MERCK & CO INC COM 58933Y105 4,334 0 0.00 247 -0.80 0.0876
2015-05-14 2015-03-31 13F MERCK & CO INC COM 58933Y105 4,334 0 0.00 249 1.22 0.0859
2015-02-12 2014-12-31 13F MERCK & CO INC COM 58933Y105 4,334 -450 -9.41 246 -13.38 0.0881
2014-11-14 2014-09-30 13F MERCK & CO INC COM 58933Y105 4,784 0 0.00 284 2.53 0.1085
2014-08-14 2014-06-30 13F MERCK & CO INC COM 58933Y105 4,784 200 4.36 277 6.54 0.1029
2014-05-15 2014-03-31 13F MERCK & CO INC COM 58933Y105 4,584 -1,230 -21.16 260 -10.65 0.1001
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 5,814 -450 -7.18 291 -2.35 0.1145
2013-11-14 2013-09-30 13F MERCK & CO INC COM 58933Y105 6,264 0 0.00 298 2.41 0.1299
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 6,264 6,264 291 0.1326
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.