默克公司
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionFlagship Harbor Advisors, Llc
Latest Disclosed Ownership50,710 shares
Latest Disclosed Value $ 6,099,936
Flagship Harbor Advisors, Llc reports 6.33% decrease in ownership of MRK / Merck & Co., Inc.

On April 28, 2026 - Flagship Harbor Advisors, Llc filed a 13F-HR form disclosing ownership of 50,710 shares of Merck & Co., Inc. (MX:MRK) valued at $6,099,936 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 54,139 shares of Merck & Co., Inc.. This represents a change in shares of -6.33% 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)
2026-04-28 2026-03-31 13F MERCK COM 58933Y105 50,710 -3,429 -6.33 6,100 7.04 0.2683
2026-01-21 2025-12-31 13F MERCK Common Stock 58933Y105 54,139 -5,338 -8.97 5,699 14.17 0.2689
2025-11-05 2025-09-30 13F MERCK COM 58933Y105 59,477 -1,046 -1.73 4,992 4.20 0.2172
2025-08-04 2025-06-30 13F MERCK COM 58933Y105 60,523 7,826 14.85 4,791 1.27 0.2269
2025-04-22 2025-03-31 13F MERCK COM 58933Y105 52,697 5,099 10.71 4,730 -0.11 0.2487
2025-01-21 2024-12-31 13F MERCK COM 58933Y105 47,598 3,410 7.72 4,735 -5.62 0.2487
2024-10-21 2024-09-30 13F MERCK COM 58933Y105 44,188 -322 -0.72 5,018 -8.95 0.2756
2025-12-02 2024-06-30 13F MERCK COM 58933Y105 44,510 3,838 9.44 5,510 2.68 0.3312
2024-04-16 2024-03-31 13F MERCK COM 58933Y105 40,672 74 0.18 5,367 21.27 0.3449
2024-01-10 2023-12-31 13F MERCK COM 58933Y105 40,598 177 0.44 4,426 6.34 0.3219
2023-10-17 2023-09-30 13F MERCK COM 58933Y105 40,421 388 0.97 4,161 -9.92 0.3461
2023-07-11 2023-06-30 13F MERCK COM 58933Y105 40,033 -305 -0.76 4,619 7.64 0.3816
2023-04-12 2023-03-31 13F MERCK COM 58933Y105 40,338 5 0.01 4,292 -4.09 0.4042
2023-01-13 2022-12-31 13F MERCK COM 58933Y105 40,333 845 2.14 4,475 31.55 0.4587
2022-10-13 2022-09-30 13F MERCK COM 58933Y105 39,488 1,044 2.72 3,401 -2.97 0.3945
2022-07-13 2022-06-30 13F MERCK COM 58933Y105 38,444 -268 -0.69 3,505 10.36 0.3937
2022-04-13 2022-03-31 13F MERCK & CO. COM 58933Y105 38,712 1,135 3.02 3,176 10.28 0.3060
2022-02-17 2021-12-31 13F/A-1 MERCK COM 58933Y105 37,577 -2,485 -6.20 2,880 -7.57 0.2725
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 37,577 -2,485 2,880 0.2725
2021-11-01 2021-09-30 13F MERCK COM 58933Y105 40,062 0 0.00 3,116 0.00 0.3348
2021-07-26 2021-06-30 13F MERCK COM 58933Y105 40,062 3,234 8.78 3,116 9.76 0.3342
2021-05-03 2021-03-31 13F MERCK & CO. COM 58933Y105 36,828 1,141 3.20 2,839 -2.74 0.3223
2021-02-08 2020-12-31 13F MERCK & CO. COM 58933Y105 35,687 2,029 6.03 2,919 4.59 0.3619
2020-10-13 2020-09-30 13F MERCK Common Stock 58933Y105 33,658 -775 -2.25 2,791 4.85 0.3769
2020-07-31 2020-06-30 13F MERCK Common Stock 58933Y105 34,433 5,919 20.76 2,662 21.33 0.3908
2020-05-12 2020-03-31 13F MERCK Common Stock 58933Y105 28,514 -746 -2.55 2,194 -17.55 0.4388
2020-02-14 2019-12-31 13F MERCK Common Stock 58933Y105 29,260 -79 -0.27 2,661 7.78 0.4660
2019-10-22 2019-09-30 13F MERCK Common Stock 58933Y105 29,339 578 2.01 2,469 2.41 0.4839
2019-07-22 2019-06-30 13F MERCK Common Stock 58933Y105 28,761 1,017 3.67 2,411 4.51 0.5003
2019-04-15 2019-03-31 13F MERCK Common Stock 58933Y105 27,744 1,328 5.03 2,307 14.32 0.4739
2019-01-26 2018-12-31 13F MERCK COM 58933Y105 26,416 -1,105 -4.02 2,018 2.49 0.4904
2018-11-05 2018-09-30 13F MERCK Common Stock 58933Y105 27,521 -4,175 -13.17 1,969 2.39 0.3651
2018-08-14 2018-06-30 13F MERCK Common Stock 58933Y105 31,696 1,667 5.55 1,923 19.96 0.3849
2018-04-23 2018-03-31 13F MERCK COM 58933Y105 30,029 4,539 17.81 1,603 11.09 0.4766
2018-01-24 2017-12-31 13F MERCK COM 58933Y105 25,490 1,429 5.94 1,443 -6.60 0.4148
2017-10-23 2017-09-30 13F MERCK COM 58933Y105 24,061 522 2.22 1,545 4.46 0.5013
2017-08-09 2017-06-30 13F MERCK COM 58933Y105 23,539 293 1.26 1,479 0.07 0.5135
2017-05-16 2017-03-31 13F MERCK COM 58933Y105 23,246 4,075 21.26 1,478 23.06 0.5646
2017-05-15 2016-12-31 13F MERCK COM 58933Y105 19,171 19,171 1,201 0.5183
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.