Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRegister Financial Advisors LLC
Latest Disclosed Ownership14,468 shares
Latest Disclosed Value $ 1,740,369
Register Financial Advisors LLC reports 0.30% increase in ownership of MRK / Merck & Co., Inc.

On April 15, 2026 - Register Financial Advisors LLC filed a 13F-HR form disclosing ownership of 14,468 shares of Merck & Co., Inc. (MX:MRK) valued at $1,740,369 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 14,425 shares of Merck & Co., Inc.. This represents a change in shares of 0.30% 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)
2026-04-15 2026-03-31 13F MERCK COM 58933Y105 14,468 43 0.30 1,740 14.62 0.6433
2026-01-21 2025-12-31 13F MERCK COM 58933Y105 14,425 -394 -2.66 1,518 22.12 0.5913
2025-10-30 2025-09-30 13F MERCK COM 58933Y105 14,819 381 2.64 1,244 8.84 0.4892
2025-07-16 2025-06-30 13F MERCK COM 58933Y105 14,438 -585 -3.89 1,143 -15.28 0.4991
2025-04-22 2025-03-31 13F MERCK COM 58933Y105 15,023 111 0.74 1,348 -9.10 0.7021
2025-01-22 2024-12-31 13F MERCK COM 58933Y105 14,912 1,034 7.45 1,483 -5.90 0.7449
2024-10-15 2024-09-30 13F MERCK COM 58933Y105 13,878 -221 -1.57 1,576 -9.68 0.8085
2024-07-12 2024-06-30 13F MERCK COM 58933Y105 14,099 -18 -0.13 1,746 -6.28 0.8821
2024-04-16 2024-03-31 13F MERCK COM 58933Y105 14,117 -504 -3.45 1,863 16.89 0.9664
2024-01-12 2023-12-31 13F MERCK COM 58933Y105 14,621 259 1.80 1,594 7.78 1.0661
2023-10-13 2023-09-30 13F MERCK COM 58933Y105 14,362 4 0.03 1,479 -10.75 1.0828
2023-08-04 2023-06-30 13F MERCK COM 58933Y105 14,358 -601 -4.02 1,657 4.09 1.1826
2023-05-10 2023-03-31 13F MERCK COM 58933Y105 14,959 1,286 9.41 1,591 4.95 1.2511
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 13,673 13,673 1,517 0.9684
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.