Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCapital Counsel Llc/ny
Latest Disclosed Ownership63,213 shares
Latest Disclosed Value $ 7,603,892
Capital Counsel Llc/ny ownership in MRK / Merck & Co., Inc.

On May 14, 2026 - Capital Counsel Llc/ny filed a 13F-HR form disclosing ownership of 63,213 shares of Merck & Co., Inc. (MX:MRK) valued at $7,603,892 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 63,213 shares of Merck & Co., Inc.. This represents a change in shares of 0.00% 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 & CO INC NEW COM COM 58933Y105 63,213 0 0.00 7,604 14.28 0.3235
2026-02-12 2025-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 63,213 0 0.00 6,654 25.41 0.2541
2025-11-13 2025-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 63,213 -15 -0.02 5,305 5.99 0.2034
2025-08-13 2025-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 63,228 1,120 1.80 5,005 -10.21 0.2030
2025-05-14 2025-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 62,108 -73 -0.12 5,575 -9.88 0.2470
2025-05-13 2024-12-31 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 62,181 -25 -0.04 6,186 -12.44 0.2643
2025-02-13 2024-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 62,181 -25 6,186 0.2644
2024-11-13 2024-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 62,206 23 0.04 7,064 -8.24 0.3039
2024-08-14 2024-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 7,698 -6.18 0.3437
2024-05-15 2024-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 8,205 21.04 0.3770
2024-02-14 2023-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 6,779 5.91 0.3332
2023-11-14 2023-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 6,402 -10.79 0.3562
2023-08-14 2023-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 7,175 8.47 0.3953
2023-05-15 2023-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 6,616 -4.12 0.3803
2023-02-09 2022-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 6,899 28.83 0.4341
2022-11-14 2022-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 5,355 -5.54 0.3466
2022-08-15 2022-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 0 0.00 5,669 11.11 0.3455
2022-05-16 2022-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 62,183 -50 -0.08 5,102 6.96 0.2424
2022-02-14 2021-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 62,233 -143 -0.23 4,770 1.81 0.2021
2021-11-12 2021-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 62,376 -2,815 -4.32 4,685 -7.59 0.2305
2021-08-12 2021-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 65,191 -30,776 -32.07 5,070 -31.47 0.2547
2021-05-12 2021-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 95,967 0 0.00 7,398 -5.76 0.4122
2021-02-10 2020-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 95,967 0 0.00 7,850 -1.38 0.4598
2020-11-16 2020-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 95,967 -100 -0.10 7,960 7.15 0.5376
2020-08-14 2020-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 96,067 0 0.00 7,429 0.51 0.5397
2020-05-15 2020-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 96,067 -2,316 -2.35 7,391 -17.40 0.5876
2020-02-14 2019-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 98,383 750 0.77 8,948 8.87 0.5941
2019-11-14 2019-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 97,633 -1,100 -1.11 8,219 -0.72 0.5752
2019-08-14 2019-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 98,733 0 0.00 8,279 0.82 0.5545
2019-05-15 2019-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 98,733 0 0.00 8,212 8.85 0.5999
2019-02-13 2018-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 98,733 0 0.00 7,544 7.71 0.6258
2018-11-14 2018-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 98,733 -1,950 -1.94 7,004 14.61 0.4886
2018-08-14 2018-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 100,683 0 0.00 6,111 11.43 0.4664
2018-05-14 2018-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 100,683 -755 -0.74 5,484 -3.92 0.4437
2018-02-13 2017-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 101,438 69 0.07 5,708 -12.06 0.4693
2017-11-14 2017-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 101,369 -710 -0.70 6,491 -0.78 0.5809
2017-08-10 2017-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 102,079 -240 -0.23 6,542 0.63 0.5959
2017-05-12 2017-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 102,319 1,983 1.98 6,501 10.06 0.6189
2017-02-13 2016-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 100,336 0 0.00 5,907 -5.67 0.6109
2016-11-14 2016-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 100,336 4,416 4.60 6,262 13.32 0.5591
2016-08-10 2016-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 95,920 -4,306 -4.30 5,526 4.21 0.5095
2016-05-13 2016-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 100,226 -1,459 -1.43 5,303 -1.27 0.4794
2016-02-11 2015-12-31 13F MERCK COM 58933Y105 101,685 431 0.43 5,371 7.40 0.2849
2015-11-13 2015-09-30 13F MERCK COM 58933Y105 101,254 -4,400 -4.16 5,001 -16.86 0.2611
2015-09-28 2015-06-30 13F/A-1 MERCK COM 58933Y105 105,654 0 0.00 6,015 -0.96 0.2978
2015-08-13 2015-06-30 13F MERCK COM 58933Y105 105,654 6,015
2015-05-13 2015-03-31 13F MERCK & CO INC COM 58933Y105 105,654 0 0.00 6,073 1.22 0.2895
2015-02-11 2014-12-31 13F MERCK & CO INC COM 58933Y105 105,654 173 0.16 6,000 -4.05 0.2818
2014-11-12 2014-09-30 13F MERCK & CO INC COM 58933Y105 105,481 0 0.00 6,253 2.47 0.3517
2014-08-12 2014-06-30 13F MERCK & CO INC COM 58933Y105 105,481 100 0.09 6,102 2.01 0.3327
2014-05-12 2014-03-31 13F MERCK & CO INC COM 58933Y105 105,381 -1,000 -0.94 5,982 12.36 0.3266
2014-02-12 2013-12-31 13F MERCK & CO INC COM 58933Y105 106,381 -400 -0.37 5,324 4.72 0.2981
2013-11-07 2013-09-30 13F MERCK & CO INC COM 58933Y105 106,781 -313 -0.29 5,084 2.19 0.2962
2013-08-09 2013-06-30 13F MERCK & CO INC COM 58933Y105 107,094 107,094 4,975 0.2983
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.