Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionIron Financial, LLC
Latest Disclosed Ownership1,756 shares
Latest Disclosed Value $ 211,286
Iron Financial, LLC ownership in MRK / Merck & Co., Inc.

On April 27, 2026 - Iron Financial, LLC filed a 13F-HR form disclosing ownership of 1,756 shares of Merck & Co., Inc. (MX:MRK) valued at $211,286 USD as of March 31, 2026. The entity filed a previous 13F-HR on October 28, 2024 disclosing 0 shares of Merck & Co., Inc..

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)
2026-04-27 2026-03-31 13F MERCK COM 58933Y105 1,756 1,756 211 0.0923
2024-10-28 2024-09-30 13F MERCK COM 58933Y105 0 -1,811 -100.00 0 -100.00
2024-07-29 2024-06-30 13F MERCK COM 58933Y105 1,811 80 4.62 224 -1.75 0.1257
2024-04-23 2024-03-31 13F MERCK COM 58933Y105 1,731 1,731 228 0.1273
2023-10-31 2023-09-30 13F MERCK COM 58933Y105 0 -2,056 -100.00 0 -100.00
2023-07-24 2023-06-30 13F MERCK COM 58933Y105 2,056 -94 -4.37 237 3.95 0.1274
2023-04-26 2023-03-31 13F MERCK COM 58933Y105 2,150 -8,296 -79.42 229 -80.31 0.1256
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 10,446 -419 -3.86 1,159 23.72 0.6653
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 10,865 567 5.51 936 -0.32 0.5139
2022-07-27 2022-06-30 13F MERCK COM 58933Y105 10,298 1,282 14.22 939 26.89 0.4917
2022-05-04 2022-03-31 13F MERCK COM 58933Y105 9,016 1,016 12.70 740 20.72 0.3410
2022-02-11 2021-12-31 13F MERCK COM 58933Y105 8,000 792 10.99 613 13.31 0.2734
2021-11-02 2021-09-30 13F MERCK COM 58933Y105 7,208 7,208 541 0.2595
2020-04-20 2020-03-31 13F MERCK COM 58933Y105 0 -2,321 -100.00 0 -100.00
2020-01-30 2019-12-31 13F MERCK COM 58933Y105 2,321 2,321 211 0.1005
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.