Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionAmbassador Advisors, LLC
Latest Disclosed Ownership9,623 shares
Latest Disclosed Value $ 1,157,506
Ambassador Advisors, LLC reports 33.78% increase in ownership of MRK / Merck & Co., Inc.

On April 17, 2026 - Ambassador Advisors, LLC filed a 13F-HR form disclosing ownership of 9,623 shares of Merck & Co., Inc. (MX:MRK) valued at $1,157,506 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 7,193 shares of Merck & Co., Inc.. This represents a change in shares of 33.78% 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)
2026-04-17 2026-03-31 13F MERCK COM 58933Y105 9,623 2,430 33.78 1,158 52.84 0.1651
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 7,193 -406 -5.34 757 18.84 0.1110
2025-11-19 2025-09-30 13F MERCK COM 58933Y105 7,599 -312 -3.94 638 1.76 0.0948
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 7,911 -1,163 -12.82 626 -23.10 0.0972
2025-05-16 2025-03-31 13F MERCK COM 58933Y105 9,074 278 3.16 814 -6.97 0.1418
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 8,796 -889 -9.18 875 -20.38 0.1490
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 9,685 -698 -6.72 1,100 -14.47 0.1913
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 10,383 241 2.38 1,285 -3.96 0.2324
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 10,142 4,610 83.33 1,338 91.97 0.2429
2024-02-15 2023-12-31 13F MERCK COM 58933Y105 5,532 1,019 22.58 698 50.87 0.1549
2023-11-15 2023-09-30 13F MERCK COM 58933Y105 4,513 132 3.01 462 -1.70 0.1126
2023-08-15 2023-06-30 13F MERCK COM 58933Y105 4,381 2,122 93.94 471 77.36 0.1086
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 2,259 2,259 266 0.0602
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.