Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionNaples Global Advisors, Llc
Latest Disclosed Ownership106,821 shares
Latest Disclosed Value $ 12,935,503
Naples Global Advisors, Llc reports 1.07% decrease in ownership of MRK / Merck & Co., Inc.

On April 20, 2026 - Naples Global Advisors, Llc filed a 13F-HR form disclosing ownership of 106,821 shares of Merck & Co., Inc. (MX:MRK) valued at $12,935,503 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 107,975 shares of Merck & Co., Inc.. This represents a change in shares of -1.07% 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)
2026-04-20 2026-03-31 13F MERCK COM 58933Y105 106,821 -1,154 -1.07 12,936 12.96 0.9439
2026-02-04 2025-12-31 13F MERCK COM 58933Y105 107,975 57 0.05 11,452 25.28 0.8557
2025-10-30 2025-09-30 13F MERCK COM 58933Y105 107,918 990 0.93 9,141 6.95 0.7118
2025-07-18 2025-06-30 13F MERCK COM 58933Y105 106,928 5,768 5.70 8,547 -6.68 0.7354
2025-04-10 2025-03-31 13F MERCK COM 58933Y105 101,160 2,981 3.04 9,158 -6.95 0.8701
2025-01-29 2024-12-31 13F MERCK COM 58933Y105 98,179 1,784 1.85 9,843 -10.67 0.9206
2024-10-24 2024-09-30 13F MERCK COM 58933Y105 96,395 1,476 1.56 11,018 -6.80 1.0244
2024-07-18 2024-06-30 13F MERCK COM 58933Y105 94,919 -622 -0.65 11,822 -6.75 1.1862
2024-04-29 2024-03-31 13F MERCK COM 58933Y105 95,541 -278 -0.29 12,678 20.54 1.2977
2024-01-11 2023-12-31 13F MERCK COM 58933Y105 95,819 -228 -0.24 10,517 5.65 1.1566
2023-10-16 2023-09-30 13F MERCK COM 58933Y105 96,047 2,317 2.47 9,956 -8.51 1.2065
2023-07-17 2023-06-30 13F MERCK COM 58933Y105 93,730 -1,026 -1.08 10,881 7.23 1.2765
2023-04-17 2023-03-31 13F MERCK COM 58933Y105 94,756 -678 -0.71 10,148 -4.77 1.2651
2023-04-17 2022-12-31 13F/A-1 MERCK COM 58933Y105 95,434 -730 -0.76 10,656 27.68 1.3541
2023-01-20 2022-12-31 13F MERCK COM 58933Y105 95,434 -730 10,656 0.0014
2022-10-20 2022-09-30 13F MERCK COM 58933Y105 96,164 1,130 1.19 8,345 -4.17 1.1485
2022-08-11 2022-06-30 13F MERCK COM 58933Y105 95,034 1,338 1.43 8,708 13.27 1.1300
2022-04-28 2022-03-31 13F MERCK COM 58933Y105 93,696 1,798 1.96 7,688 9.16 0.8877
2022-02-04 2021-12-31 13F MERCK COM 58933Y105 91,898 3,161 3.56 7,043 5.67 0.8162
2021-10-29 2021-09-30 13F/A-1 MERCK COM 58933Y105 88,737 3,082 3.60 6,665 0.06 0.8754
2021-10-25 2021-09-30 13F MERCK COM 58933Y105 88,737 3,082 6,665 0.8711
2021-08-06 2021-06-30 13F MERCK COM 58933Y105 85,655 4,441 5.47 6,661 6.39 0.9262
2021-05-10 2021-03-31 13F MERCK & CO. COM 58933Y105 81,214 3,578 4.61 6,261 -1.42 0.9515
2021-02-08 2020-12-31 13F MERCK & CO. COM 58933Y105 77,636 510 0.66 6,351 -0.73 1.0739
2020-10-26 2020-09-30 13F MERCK & CO. COM 58933Y105 77,126 3,772 5.14 6,398 12.80 1.2472
2020-08-04 2020-06-30 13F MERCK & CO. COM 58933Y105 73,354 6,788 10.20 5,672 10.74 1.2221
2020-04-27 2020-03-31 13F MERCK & CO. COM 58933Y105 66,566 -672 -1.00 5,122 -16.24 1.3424
2020-02-05 2019-12-31 13F Merck COM 58933Y105 67,238 537 0.81 6,115 8.90 1.2840
2019-10-28 2019-09-30 13F Merck COM 58933Y105 66,701 655 0.99 5,615 1.39 1.3114
2019-07-10 2019-06-30 13F Merck COM 58933Y105 66,046 4,233 6.85 5,538 7.72 1.3474
2019-04-29 2019-03-31 13F Merck COM 58933Y105 61,813 2,727 4.62 5,141 16.81 1.3143
2019-02-01 2018-12-31 13F Merck COM 58933Y105 59,086 3,868 7.00 4,401 12.36 1.2526
2018-11-13 2018-09-30 13F/A-1 Merck COM 58933Y105 55,218 1,530 2.85 3,917 20.19 1.0393
2018-11-13 2018-09-30 13F Merck COM 58933Y105 53,688 0 3,259
2018-07-23 2018-06-30 13F Merck COM 58933Y105 53,688 2,946 5.81 3,259 17.91 0.9181
2018-04-17 2018-03-31 13F Merck COM 58933Y105 50,742 4,392 9.48 2,764 5.98 0.8200
2018-01-19 2017-12-31 13F Merck COM 58933Y105 46,350 5,897 14.58 2,608 0.69 0.7700
2017-10-16 2017-09-30 13F Merck COM 58933Y105 40,453 1,572 4.04 2,590 3.93 0.8646
2017-07-25 2017-06-30 13F Merck COM 58933Y105 38,881 1,610 4.32 2,492 5.24 0.8839
2017-04-21 2017-03-31 13F Merck COM 58933Y105 37,271 2,572 7.41 2,368 15.91 0.8498
2017-01-30 2016-12-31 13F Merck COM 58933Y105 34,699 198 0.57 2,043 -5.11 0.7954
2016-10-11 2016-09-30 13F Merck COM 58933Y105 34,501 4,300 14.24 2,153 23.74 0.8419
2016-07-13 2016-06-30 13F Merck COM 58933Y105 30,201 1,125 3.87 1,740 13.13 0.7122
2016-04-13 2016-03-31 13F Merck COM 58933Y105 29,076 -125 -0.43 1,538 -0.26 0.6445
2016-01-25 2015-12-31 13F Merck COM 58933Y105 29,201 2,050 7.55 1,542 14.99 0.7471
2015-10-14 2015-09-30 13F Merck COM 58933Y105 27,151 8,004 41.80 1,341 23.03 0.6890
2015-07-27 2015-06-30 13F Merck COM 58933Y105 19,147 3,694 23.90 1,090 22.75 0.5231
2015-04-15 2015-03-31 13F Merck & Co Inc COM 58933Y105 15,453 5,816 60.35 888 62.34 0.4221
2015-01-22 2014-12-31 13F Merck & Co Inc COM 58933Y105 9,637 1,145 13.48 547 8.75 0.2894
2014-10-16 2014-09-30 13F Merck & Co Inc COM 58933Y105 8,492 500 6.26 503 8.87 0.2964
2014-07-14 2014-06-30 13F Merck & Co Inc COM 58933Y105 7,992 100 1.27 462 3.13 0.2739
2014-04-07 2014-03-31 13F Merck & Co Inc COM 58933Y105 7,892 901 12.89 448 28.00 0.2740
2014-01-16 2013-12-31 13F Merck & Co Inc COM 58933Y105 6,991 6,991 350 0.2334
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.