머크 앤 컴퍼니(Merck & Co., Inc.)
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionProstatis Group LLC
Latest Disclosed Ownership2,757 shares
Latest Disclosed Value $ 331,640
Prostatis Group LLC reports 2.06% decrease in ownership of MRK / Merck & Co., Inc.

On May 12, 2026 - Prostatis Group LLC filed a 13F-HR form disclosing ownership of 2,757 shares of Merck & Co., Inc. (MX:MRK) valued at $331,640 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,815 shares of Merck & Co., Inc.. This represents a change in shares of -2.06% 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.

Upgrade to unlock premium data and export to Excel .

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 2,757 -58 -2.06 332 11.82 0.0849
2026-02-17 2025-12-31 13F MERCK COM 58933Y105 2,815 2,815 296 0.0708
2025-05-16 2025-03-31 13F MERCK COM 58933Y105 0 -2,773 -100.00 0 -100.00
2025-03-21 2024-12-31 13F MERCK COM 58933Y105 2,773 -693 -19.99 276 -30.03 0.0804
2025-03-21 2024-09-30 13F MERCK COM 58933Y105 3,466 -105 -2.94 394 -11.09 0.1288
2025-03-21 2024-06-30 13F MERCK COM 58933Y105 3,571 677 23.39 442 16.01 0.1550
2025-03-21 2024-03-31 13F MERCK COM 58933Y105 2,894 -167 -5.46 382 14.41 0.1448
2025-03-21 2023-12-31 13F MERCK COM 58933Y105 3,061 -296 -8.82 334 -11.44 0.1395
2025-03-21 2023-09-30 13F MERCK COM 58933Y105 3,357 -172,568 -98.09 376 8.05 0.1840
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 175,925 167,711 2,041.77 349 -60.94 0.1623
2023-05-22 2023-03-31 13F MERCK COM 58933Y105 8,214 -31 -0.38 891 -2.52 0.4705
2023-03-28 2022-12-31 13F/A-1 MERCK COM 58933Y105 8,245 5,758 231.52 915 327.10 0.5582
2023-03-23 2022-12-31 13F MERCK COM 58933Y105 742,711 645,400 915 0.5335
2023-03-28 2022-09-30 13F/A-1 MERCK COM 58933Y105 2,487 125 5.29 214 -0.47 0.2468
2023-03-23 2022-09-30 13F MERCK COM 58933Y105 97,311 -5,500 214 0.2254
2023-03-28 2022-06-30 13F/A-1 MERCK COM 58933Y105 2,362 -89,765 -97.44 215 43.33 0.3356
2023-03-23 2022-06-30 13F MERCK COM 58933Y105 102,811 10,684 215 0.2968
2023-03-23 2022-03-31 13F MERCK & CO. COM 58933Y105 92,127 6,562 7.67 151 51.52 0.1095
2023-03-23 2021-12-31 13F MERCK COM 58933Y105 85,565 1,705 2.03 100 2.06 0.0594
2023-03-23 2021-09-30 13F MERCK COM 58933Y105 83,860 -2,963 -3.41 98 -3.96 0.0569
2023-03-23 2021-06-30 13F MERCK COM 58933Y105 86,823 696 0.81 101 -3.81 0.0671
2023-03-23 2021-03-31 13F MERCK & CO. COM 58933Y105 86,127 -6,117 -6.63 105 -42.31 0.0804
2023-03-23 2020-12-31 13F MERCK & CO. COM 58933Y105 92,244 -1,397 -1.49 183 -6.19 0.1474
2023-03-23 2020-09-30 13F MERCK & CO. COM 58933Y105 93,641 89,280 2,047.24 195 -42.43 0.1754
2023-03-28 2020-06-30 13F/A-1 MERCK & CO. COM 58933Y105 4,361 -90,770 -95.42 337 209.17 0.6779
2023-03-23 2020-06-30 13F MERCK & CO. COM 58933Y105 278,793 183,662 337 0.6217
2023-03-23 2020-03-31 13F MERCK & CO. COM 58933Y105 95,131 -6,374 -6.28 109 -7.63 0.1437
2023-03-23 2019-12-31 13F MERCK COM 58933Y105 101,505 101,505 118 0.1015
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.