Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionBallentine Partners, LLC
Latest Disclosed Ownership48,890 shares
Latest Disclosed Value $ 5,881,137
Ballentine Partners, LLC reports 1.49% increase in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Ballentine Partners, LLC filed a 13F-HR form disclosing ownership of 48,890 shares of Merck & Co., Inc. (MX:MRK) valued at $5,881,137 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 48,171 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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 48,890 719 1.49 5,881 16.00 0.0574
2026-02-03 2025-12-31 13F MERCK COM 58933Y105 48,171 2,875 6.35 5,070 33.39 0.0712
2025-11-03 2025-09-30 13F MERCK COM 58933Y105 45,296 -3,420 -7.02 3,802 -1.43 0.0528
2025-07-15 2025-06-30 13F MERCK COM 58933Y105 48,716 -11,780 -19.47 3,856 -28.99 0.0581
2025-05-01 2025-03-31 13F MERCK COM 58933Y105 60,496 -3,013 -4.74 5,430 -14.04 0.0941
2025-01-16 2024-12-31 13F MERCK COM 58933Y105 63,509 -2,667 -4.03 6,318 -15.93 0.1083
2024-10-23 2024-09-30 13F MERCK COM 58933Y105 66,176 -8,003 -10.79 7,515 -18.17 0.1285
2024-08-06 2024-06-30 13F MERCK COM 58933Y105 74,179 6,044 8.87 9,183 2.15 0.1699
2024-04-11 2024-03-31 13F MERCK COM 58933Y105 68,135 4,694 7.40 8,990 29.99 0.1707
2024-01-23 2023-12-31 13F MERCK COM 58933Y105 63,441 9,690 18.03 6,916 25.00 0.1411
2023-10-19 2023-09-30 13F MERCK COM 58933Y105 53,751 -942 -1.72 5,534 -12.33 0.1301
2023-07-26 2023-06-30 13F MERCK COM 58933Y105 54,693 -2,236 -3.93 6,311 4.21 0.1449
2023-04-27 2023-03-31 13F MERCK COM 58933Y105 56,929 15,114 36.14 6,057 30.55 0.1524
2023-01-27 2022-12-31 13F MERCK COM 58933Y105 41,815 4,484 12.01 4,639 44.29 0.1379
2022-10-26 2022-09-30 13F MERCK COM 58933Y105 37,331 3,897 11.66 3,215 5.44 0.1113
2022-08-09 2022-06-30 13F MERCK COM 58933Y105 33,434 2,081 6.64 3,049 26.88 0.1078
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 31,353 739 2.41 2,403 4.52 0.0718
2021-10-27 2021-09-30 13F MERCK COM 58933Y105 30,614 51 0.17 2,299 -3.28 0.0779
2021-08-12 2021-06-30 13F MERCK COM 58933Y105 30,563 -1,146 -3.61 2,377 -2.74 0.0821
2021-05-11 2021-03-31 13F MERCK & CO. COM 58933Y105 31,709 -2,077 -6.15 2,444 -11.58 0.0906
2021-01-25 2020-12-31 13F MERCK & CO. COM 58933Y105 33,786 -1,693 -4.77 2,764 -6.08 0.1095
2020-10-22 2020-09-30 13F MERCK & CO. COM 58933Y105 35,479 4,983 16.34 2,943 24.81 0.1301
2020-07-31 2020-06-30 13F MERCK & CO. COM 58933Y105 30,496 481 1.60 2,358 2.12 0.1128
2020-04-23 2020-03-31 13F MERCK & CO. COM 58933Y105 30,015 259 0.87 2,309 -14.67 0.1344
2020-01-22 2019-12-31 13F MERCK COM 58933Y105 29,756 120 0.40 2,706 8.46 0.1227
2019-10-21 2019-09-30 13F MERCK COM 58933Y105 29,636 10,282 53.13 2,495 53.73 0.1172
2019-07-25 2019-06-30 13F MERCK COM 58933Y105 19,354 3,526 22.28 1,623 23.33 0.0779
2019-05-09 2019-03-31 13F MERCK COM 58933Y105 15,828 -111 -0.70 1,316 8.05 0.0685
2019-02-04 2018-12-31 13F MERCK COM 58933Y105 15,939 -2,231 -12.28 1,218 -5.51 0.0702
2018-10-30 2018-09-30 13F MERCK COM 58933Y105 18,170 893 5.17 1,289 23.00 0.0673
2018-07-19 2018-06-30 13F MERCK COM 58933Y105 17,277 1,146 7.10 1,048 19.23 0.0581
2018-04-26 2018-03-31 13F MERCK COM 58933Y105 16,131 -3,107 -16.15 879 -18.91 0.0494
2018-02-02 2017-12-31 13F MERCK COM 58933Y105 19,238 -3,849 -16.67 1,084 -26.66 0.0592
2017-11-06 2017-09-30 13F MERCK COM 58933Y105 23,087 3,781 19.58 1,478 22.86 0.0816
2017-08-03 2017-06-30 13F MERCK COM 58933Y105 19,306 1,842 10.55 1,203 8.09 0.0878
2017-05-30 2017-03-31 13F/A-1 MERCK COM 58933Y105 17,464 1,862 11.93 1,113 21.24 0.0791
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 17,464 1,862 1,113 0.0793
2017-02-03 2016-12-31 13F MERCK COM 58933Y105 15,602 1,328 9.30 918 3.03 0.0709
2016-11-01 2016-09-30 13F MERCK COM 58933Y105 14,274 -947 -6.22 891 1.60 0.0724
2016-08-03 2016-06-30 13F MERCK COM 58933Y105 15,221 346 2.33 877 11.44 0.0739
2016-05-09 2016-03-31 13F MERCK & CO INC COM 58933Y105 14,875 784 5.56 787 5.78 0.0692
2016-01-28 2015-12-31 13F MERCK & CO INC COM 58933Y105 14,091 81 0.58 744 7.51 0.0725
2015-11-03 2015-09-30 13F MERCK & CO INC COM 58933Y105 14,010 -60 -0.43 692 -13.61 0.0726
2015-07-28 2015-06-30 13F MERCK & CO INC COM 58933Y105 14,070 720 5.39 801 4.43 0.0780
2015-05-12 2015-03-31 13F MERCK & CO INC COM 58933Y105 13,350 13,350 0.00 767 0.0753
2015-02-02 2014-12-31 13F MERCK & CO INC COM 58933Y105 0 -13,793 -100.00 0 -100.00
2014-11-05 2014-09-30 13F MERCK & CO INC COM 58933Y105 13,793 0 0.00 818 2.51 0.0970
2014-08-12 2014-06-30 13F MERCK & CO INC COM 58933Y105 13,793 256 1.89 798 3.91 0.0945
2014-05-05 2014-03-31 13F MERCK & CO INC COM 58933Y105 13,537 100 0.74 768 14.12 0.0899
2014-02-06 2013-12-31 13F MERCK & CO INC COM 58933Y105 13,437 67 0.50 673 5.65 0.0756
2013-10-29 2013-09-30 13F MERCK & CO INC COM 58933Y105 13,370 3,045 29.49 637 32.99 0.0781
2013-07-24 2013-06-30 13F MERCK & CO INC COM 58933Y105 10,325 10,325 479 0.0644
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.