Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionOne Capital Management, LLC
Latest Disclosed Ownership160,540 shares
Latest Disclosed Value $ 19,311,367
One Capital Management, LLC reports 1.49% increase in ownership of MRK / Merck & Co., Inc.

On May 12, 2026 - One Capital Management, LLC filed a 13F-HR form disclosing ownership of 160,540 shares of Merck & Co., Inc. (MX:MRK) valued at $19,311,367 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 158,176 shares of Merck & Co., Inc.. This represents a change in shares of 1.49% 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)
2026-05-12 2026-03-31 13F Merck COM 58933Y105 160,540 2,364 1.49 19,311 15.99 0.5279
2026-02-10 2025-12-31 13F Merck COM 58933Y105 158,176 9,843 6.64 16,650 33.74 0.5028
2025-11-14 2025-09-30 13F Merck COM 58933Y105 148,333 14,505 10.84 12,450 17.52 0.3973
2025-08-11 2025-06-30 13F Merck COM 58933Y105 133,828 17,482 15.03 10,594 1.44 0.3668
2025-05-14 2025-03-31 13F Merck COM 58933Y105 116,346 14,790 14.56 10,443 3.38 0.3530
2025-02-06 2024-12-31 13F MERCK & CO INC- COM 58933Y105 101,556 3,202 3.26 10,103 -9.55 0.3344
2024-11-12 2024-09-30 13F MERCK & CO INC- COM 58933Y105 98,354 7,924 8.76 11,169 -0.23 0.3562
2024-08-09 2024-06-30 13F MERCK & CO INC- COM 58933Y105 90,430 8,857 10.86 11,195 4.01 0.3812
2024-05-08 2024-03-31 13F MERCK & CO INC- COM 58933Y105 81,573 1,765 2.21 10,764 23.71 0.3906
2024-02-07 2023-12-31 13F MERCK & CO INC- COM 58933Y105 79,808 868 1.10 8,701 7.06 0.3446
2023-11-09 2023-09-30 13F MERCK & CO INC- COM 58933Y105 78,940 3,408 4.51 8,127 -6.76 0.3609
2023-08-14 2023-06-30 13F MERCK & CO INC- COM 58933Y105 75,532 738 0.99 8,716 9.53 0.3940
2023-05-11 2023-03-31 13F MERCK & CO INC- COM 58933Y105 74,794 1,158 1.57 7,957 -2.60 0.3912
2023-02-16 2022-12-31 13F MERCK & CO INC- COM 58933Y105 73,636 -3,510 -4.55 8,170 22.97 0.4356
2022-11-14 2022-09-30 13F MERCK & CO INC- COM 58933Y105 77,146 54 0.07 6,643 -5.48 0.3921
2022-08-15 2022-06-30 13F MERCK & CO INC- COM 58933Y105 77,092 537 0.70 7,028 11.89 0.4168
2022-05-17 2022-03-31 13F MERCK & CO INC- COM 58933Y105 76,555 2,871 3.90 6,281 11.23 0.3323
2022-01-31 2021-12-31 13F MERCK & CO INC- COM 58933Y105 73,684 2,070 2.89 5,647 5.00 0.4276
2021-11-12 2021-09-30 13F MERCK & CO INC- COM 58933Y105 71,614 1,079 1.53 5,378 -1.95 0.4447
2021-08-16 2021-06-30 13F MERCK & CO INC- COM 58933Y105 70,535 9,296 15.18 5,485 16.21 0.4870
2021-05-14 2021-03-31 13F MERCK & CO INC- COM 58933Y105 61,239 7,697 14.38 4,720 7.76 0.5219
2021-02-16 2020-12-31 13F MERCK & CO INC- COM 58933Y105 53,542 3,607 7.22 4,380 5.75 0.5265
2020-10-23 2020-09-30 13F MERCK & CO. COM 58933Y105 49,935 786 1.60 4,142 8.97 0.5645
2020-08-17 2020-06-30 13F MERCK & CO. COM 58933Y105 49,149 57 0.12 3,801 0.64 0.5454
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 49,092 3,943 8.73 3,777 -8.01 0.6406
2020-01-31 2019-12-31 13F MERCK COM 58933Y105 45,149 1,161 2.64 4,106 10.88 0.6309
2019-10-21 2019-09-30 13F MERCK COM 58933Y105 43,988 -199 -0.45 3,703 -0.05 0.6167
2019-07-11 2019-06-30 13F MERCK COM 58933Y105 44,187 -653 -1.46 3,705 -0.64 0.6306
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 44,840 -880 -1.92 3,729 6.73 0.6633
2019-02-04 2018-12-31 13F MERCK & CO INC COM COM 58933Y105 45,720 -1,902 -3.99 3,494 3.43 0.7091
2018-10-06 2018-09-30 13F MERCK COM 58933Y105 47,622 -2,042 -4.11 3,378 12.04 0.6108
2018-08-06 2018-06-30 13F MERCK COM 58933Y105 49,664 2,637 5.61 3,015 17.68 0.5710
2018-05-03 2018-03-31 13F MERCK COM 58933Y105 47,027 3,193 7.28 2,562 3.85 0.5030
2018-01-26 2017-12-31 13F MERCK COM 58933Y105 43,834 637 1.47 2,467 -10.81 0.4943
2017-11-02 2017-09-30 13F MERCK COM 58933Y105 43,197 1,869 4.52 2,766 4.42 0.5754
2017-08-04 2017-06-30 13F MERCK & CO INC COM 58933Y105 41,328 739 1.82 2,649 2.71 0.7780
2017-05-01 2017-03-31 13F MERCK & CO INC COM 58933Y105 40,589 -2,318 -5.40 2,579 2.10 0.8018
2017-02-14 2016-12-31 13F MERCK & CO INC COM 58933Y105 42,907 -148 -0.34 2,526 -5.99 0.8019
2016-10-12 2016-09-30 13F MERCK & CO INC COMMON STOCK 58933Y105 43,055 -503 -1.15 2,687 7.09 0.8763
2016-08-12 2016-06-30 13F MERCK & CO INC COMMON STOCK 58933Y105 43,558 -714 -1.61 2,509 7.13 0.8747
2016-05-20 2016-03-31 13F/A-1 MERCK & CO INC COMMON STOCK 58933Y105 44,272 1,983 4.69 2,342 2.14 0.0927
2016-05-18 2016-03-31 13F MERCK & CO INC COMMON STOCK 58933Y105 44,272 2,342
2016-02-09 2015-12-31 13F MERCK COMMON STOCK 58933Y105 42,289 -247 -0.58 2,293 9.14 0.7781
2015-11-10 2015-09-30 13F MERCK COMMON STOCK 58933Y105 42,536 1,387 3.37 2,101 -10.33 0.7639
2015-07-31 2015-06-30 13F MERCK COMMON STOCK 58933Y105 41,149 3,564 9.48 2,343 8.47 0.6713
2015-05-06 2015-03-31 13F MERCK COMMON STOCK 58933Y105 37,585 1,662 4.63 2,160 5.88 0.6492
2015-02-13 2014-12-31 13F MERCK COMMON STOCK 58933Y105 35,923 2,411 7.19 2,040 2.67 0.7658
2014-11-12 2014-09-30 13F Merck COM 58933Y105 33,512 -1,339 -3.84 1,987 -1.44 0.7116
2014-08-15 2014-06-30 13F Merck COM 58933Y105 34,851 -201 -0.57 2,016 1.31 0.8131
2014-05-15 2014-03-31 13F Merck COM 58933Y105 35,052 35,052 1,990 0.7549
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.