Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionTCTC Holdings, LLC
Latest Disclosed Ownership206,456 shares
Latest Disclosed Value $ 24,834,583
TCTC Holdings, LLC reports 2.31% increase in ownership of MRK / Merck & Co., Inc.

On May 7, 2026 - TCTC Holdings, LLC filed a 13F-HR form disclosing ownership of 206,456 shares of Merck & Co., Inc. (MX:MRK) valued at $24,834,583 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 201,792 shares of Merck & Co., Inc.. This represents a change in shares of 2.31% 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)
2026-05-07 2026-03-31 13F MERCK COM 58933Y105 206,456 4,664 2.31 24,835 16.92 0.4363
2026-02-11 2025-12-31 13F MERCK COM 58933Y105 201,792 -1,271 -0.63 21,241 24.63 0.6346
2025-11-07 2025-09-30 13F MERCK COM 58933Y105 203,063 185 0.09 17,043 6.13 0.5057
2025-08-12 2025-06-30 13F MERCK COM 58933Y105 202,878 2,354 1.17 16,060 -10.78 0.5162
2025-05-07 2025-03-31 13F MERCK COM 58933Y105 200,524 155 0.08 17,999 -9.70 0.6341
2025-02-10 2024-12-31 13F MERCK COM 58933Y105 200,369 627 0.31 19,933 -12.12 0.7158
2024-11-01 2024-09-30 13F MERCK COM 58933Y105 199,742 3,256 1.66 22,683 -6.75 0.7681
2024-08-06 2024-06-30 13F MERCK COM 58933Y105 196,486 -2,066 -1.04 24,325 -7.15 0.8356
2024-05-09 2024-03-31 13F MERCK COM 58933Y105 198,552 1,079 0.55 26,199 21.69 0.8700
2024-02-09 2023-12-31 13F MERCK COM 58933Y105 197,473 893 0.45 21,528 6.38 0.7854
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 196,580 209 0.11 20,238 -10.69 0.7810
2023-08-10 2023-06-30 13F MERCK COM 58933Y105 196,371 120 0.06 22,659 8.53 0.9044
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 196,251 6,855 3.62 20,879 -0.64 0.8415
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 189,396 -2,644 -1.38 21,013 27.05 0.8563
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 192,040 150 0.08 16,539 -5.46 0.7158
2022-08-11 2022-06-30 13F MERCK COM 58933Y105 191,890 -2,869 -1.47 17,494 9.47 0.7687
2022-05-11 2022-03-31 13F MERCK COM 58933Y105 194,759 -539 -0.28 15,980 6.76 0.6570
2022-02-09 2021-12-31 13F MERCK COM 58933Y105 195,298 957 0.49 14,968 2.54 0.6394
2021-11-04 2021-09-30 13F MERCK COM 58933Y105 194,341 275 0.14 14,597 -3.28 0.6740
2021-08-11 2021-06-30 13F MERCK COM 58933Y105 194,066 -462 -0.24 15,092 0.64 0.6919
2021-05-12 2021-03-31 13F MERCK COM 58933Y105 194,528 600 0.31 14,996 -5.47 0.7115
2021-02-10 2020-12-31 13F MERCK COM 58933Y105 193,928 1,890 0.98 15,864 -0.41 0.8488
2020-11-12 2020-09-30 13F MERCK & CO. COM 58933Y105 192,038 145 0.08 15,930 7.35 0.9825
2020-08-12 2020-06-30 13F MERCK & CO. COM 58933Y105 191,893 -11,509 -5.66 14,839 -5.18 0.8794
2020-05-12 2020-03-31 13F MERCK COM 58933Y105 203,402 1,323 0.65 15,649 -14.85 1.1801
2020-02-11 2019-12-31 13F MERCK COM 58933Y105 202,079 -2,300 -1.13 18,379 6.83 0.9420
2019-11-13 2019-09-30 13F MERCK COM 58933Y105 204,379 -425 -0.21 17,204 0.18 0.9032
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 204,804 -1,344 -0.65 17,173 0.16 0.9380
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 206,148 0 0.00 17,146 8.86 0.9272
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 206,148 580 0.28 15,751 8.01 0.8784
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 205,568 -925 -0.45 14,583 16.35 0.6691
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 206,493 -1,416 -0.68 12,534 10.68 0.6061
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 207,909 3,425 1.67 11,325 -1.57 0.6027
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 204,484 -735 -0.36 11,506 -12.44 0.6018
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 205,219 -435 -0.21 13,140 -0.31 0.8111
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 205,654 2,355 1.16 13,181 2.04 0.9004
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 203,299 -249 -0.12 12,917 7.79 0.7919
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 203,548 -4,826 -2.32 11,983 -7.86 0.7287
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 208,374 581 0.28 13,005 8.64 0.9549
2016-08-15 2016-06-30 13F MERCK COM 58933Y105 207,793 2,532 1.23 11,971 10.22 0.8125
2016-05-16 2016-03-31 13F MERCK & CO INC COM 58933Y105 205,261 3,490 1.73 10,861 1.90 0.6833
2016-02-16 2015-12-31 13F MERCK & CO INC COM 58933Y105 201,771 -400 -0.20 10,658 6.73 0.6396
2015-11-16 2015-09-30 13F MERCK & CO INC COM 58933Y105 202,171 6,801 3.48 9,986 -10.22 0.5680
2015-08-14 2015-06-30 13F MERCK & CO INC COM 58933Y105 195,370 1,750 0.90 11,123 -0.05 0.6380
2015-05-15 2015-03-31 13F MERCK & CO INC COM 58933Y105 193,620 2,700 1.41 11,129 2.65 0.6565
2015-02-17 2014-12-31 13F MERCK & CO INC COM 58933Y105 190,920 0 0.00 10,842 -4.21 0.6561
2014-11-14 2014-09-30 13F MERCK & CO INC COM 58933Y105 190,920 355 0.19 11,318 2.67 0.6544
2014-08-14 2014-06-30 13F MERCK & CO INC COM 58933Y105 190,565 0 0.00 11,024 1.90 0.6976
2014-05-15 2014-03-31 13F MERCK & CO INC COM 58933Y105 190,565 614 0.32 10,818 13.79 0.6217
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 189,951 281 0.15 9,507 5.28 0.5430
2013-11-14 2013-09-30 13F MERCK & CO INC COM 58933Y105 189,670 5,935 3.23 9,030 5.81 0.5796
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 183,735 183,735 8,534 0.5615
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.