Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionWillner & Heller, Llc
Latest Disclosed Ownership7,634 shares
Latest Disclosed Value $ 918,248
Willner & Heller, Llc reports 0.26% decrease in ownership of 6MK / Merck & Co., Inc.

On April 17, 2026 - Willner & Heller, Llc filed a 13F-HR form disclosing ownership of 7,634 shares of Merck & Co., Inc. (BG:6MK) valued at $918,248 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 12, 2026 disclosing 7,654 shares of Merck & Co., Inc.. This represents a change in shares of -0.26% 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 7,634 -20 -0.26 918 14.04 0.6844
2026-01-12 2025-12-31 13F MERCK COM 58933Y105 7,654 -68 -0.88 806 24.23 0.5790
2025-10-16 2025-09-30 13F MERCK COM 58933Y105 7,722 -271 -3.39 648 2.53 0.4977
2025-07-22 2025-06-30 13F MERCK COM 58933Y105 7,993 -24 -0.30 633 -12.10 0.5329
2025-05-05 2025-03-31 13F MERCK COM 58933Y105 8,017 231 2.97 720 -7.11 0.6651
2025-01-16 2024-12-31 13F MERCK COM 58933Y105 7,786 26 0.34 775 -12.15 0.6785
2024-10-10 2024-09-30 13F MERCK COM 58933Y105 7,760 42 0.54 881 -7.75 0.7851
2024-07-19 2024-06-30 13F MERCK COM 58933Y105 7,718 -212 -2.67 956 -8.70 0.9154
2024-07-19 2024-03-31 13F MERCK COM 58933Y105 7,930 10 0.13 1,046 21.21 1.0416
2024-03-06 2023-12-31 13F MERCK COM 58933Y105 7,920 -421 -5.05 863 -6.70 0.9641
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 8,341 56 0.68 925 29.73 1.3144
2022-10-24 2022-09-30 13F MERCK COM 58933Y105 8,285 -183 -2.16 713 -7.64 1.1503
2022-07-22 2022-06-30 13F MERCK COM 58933Y105 8,468 -240 -2.76 772 15.74 1.2009
2022-07-05 2022-03-31 13F MERCK COM 58933Y105 8,708 -229 -2.56 667 -0.60 0.8203
2022-06-06 2021-12-31 13F MERCK COM 58933Y105 8,937 8,937 671 0.8921
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.