Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRed Door Wealth Management, LLC
Latest Disclosed Ownership114,700 shares
Latest Disclosed Value $ 13,797,224
Red Door Wealth Management, LLC reports 2.27% increase in ownership of MRK / Merck & Co., Inc.

On April 22, 2026 - Red Door Wealth Management, LLC filed a 13F-HR form disclosing ownership of 114,700 shares of Merck & Co., Inc. (MX:MRK) valued at $13,797,224 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 112,157 shares of Merck & Co., Inc.. This represents a change in shares of 2.27% 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)
2026-04-22 2026-03-31 13F MERCK COM 58933Y105 114,700 2,543 2.27 13,797 16.87 1.4347
2026-01-20 2025-12-31 13F MERCK COM 58933Y105 112,157 7,300 6.96 11,806 34.15 1.2283
2025-10-10 2025-09-30 13F MERCK COM 58933Y105 104,857 4,077 4.05 8,801 10.32 0.9345
2025-07-22 2025-06-30 13F MERCK COM 58933Y105 100,780 17,013 20.31 7,978 6.11 0.9523
2025-04-25 2025-03-31 13F MERCK COM 58933Y105 83,767 8,717 11.61 7,519 0.70 1.1115
2025-01-17 2024-12-31 13F MERCK COM 58933Y105 75,050 3,613 5.06 7,466 -7.96 1.1429
2024-10-16 2024-09-30 13F MERCK COM 58933Y105 71,437 3,343 4.91 8,112 -3.77 1.3493
2024-07-17 2024-06-30 13F MERCK COM 58933Y105 68,094 3,287 5.07 8,430 -1.42 1.4858
2024-04-17 2024-03-31 13F MERCK COM 58933Y105 64,807 2,140 3.41 8,551 25.18 1.6478
2024-01-17 2023-12-31 13F MERCK COM 58933Y105 62,667 2,441 4.05 6,832 10.18 1.4835
2023-10-19 2023-09-30 13F MERCK COM 58933Y105 60,226 -4,590 -7.08 6,200 -17.10 1.5497
2023-08-07 2023-06-30 13F MERCK COM 58933Y105 64,816 9,482 17.14 7,479 27.04 1.6579
2023-05-08 2023-03-31 13F MERCK COM 58933Y105 55,334 672 1.23 5,887 -2.92 1.8459
2023-01-23 2022-12-31 13F MERCK COM 58933Y105 54,662 2,790 5.38 6,065 35.75 1.9916
2022-10-13 2022-09-30 13F MERCK COM 58933Y105 51,872 2,709 5.51 4,467 -0.33 1.6927
2022-07-13 2022-06-30 13F MERCK COM 58933Y105 49,163 3,467 7.59 4,482 19.55 1.6589
2022-04-20 2022-03-31 13F MERCK COM 58933Y105 45,696 6,686 17.14 3,749 25.43 1.2569
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 39,010 4,533 13.15 2,989 15.41 0.9803
2021-10-14 2021-09-30 13F MERCK COM 58933Y105 34,477 5,512 19.03 2,590 15.01 0.9909
2021-07-29 2021-06-30 13F MERCK & CO INC COM COM 58933Y105 28,965 5,806 25.07 2,252 25.95 0.8758
2021-04-27 2021-03-31 13F MERCK COM 58933Y105 23,159 4,981 27.40 1,788 20.24 0.9115
2021-01-12 2020-12-31 13F MERCK COM 58933Y105 18,178 2,153 13.44 1,487 12.06 0.8766
2020-10-14 2020-09-30 13F MERCK COM 58933Y105 16,025 -2,075 -11.46 1,327 -5.15 0.9773
2020-07-07 2020-06-30 13F MERCK COM 58933Y105 18,100 1,967 12.19 1,399 12.73 1.0237
2020-04-20 2020-03-31 13F MERCK COM 58933Y105 16,133 4,111 34.20 1,241 15.66 1.1780
2020-01-29 2019-12-31 13F MERCK COM 58933Y105 12,022 12,022 1,073 0.9554
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.