Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionMarino, Stram & Associates Llc
Latest Disclosed Ownership24,966 shares
Latest Disclosed Value $ 3,003,190
Marino, Stram & Associates Llc reports 1.03% increase in ownership of MRK / Merck & Co., Inc.

On April 29, 2026 - Marino, Stram & Associates Llc filed a 13F-HR form disclosing ownership of 24,966 shares of Merck & Co., Inc. (MX:MRK) valued at $3,003,190 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 24,711 shares of Merck & Co., Inc.. This represents a change in shares of 1.03% 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)
2026-04-29 2026-03-31 13F MERCK COM 58933Y105 24,966 255 1.03 3,003 15.46 0.5396
2026-01-16 2025-12-31 13F MERCK COM 58933Y105 24,711 -890 -3.48 2,601 21.09 0.4700
2025-11-03 2025-09-30 13F MERCK COM 58933Y105 25,601 -2,018 -7.31 2,149 -1.74 0.3865
2025-07-18 2025-06-30 13F MERCK COM 58933Y105 27,619 -4,914 -15.10 2,186 -25.14 0.4411
2025-04-21 2025-03-31 13F MERCK COM 58933Y105 32,533 -1,905 -5.53 2,920 -14.74 0.6483
2025-01-17 2024-12-31 13F MERCK COM 58933Y105 34,438 -1,012 -2.85 3,426 -14.91 0.7581
2024-10-21 2024-09-30 13F MERCK COM 58933Y105 35,450 232 0.66 4,026 -7.68 0.8984
2024-07-18 2024-06-30 13F MERCK COM 58933Y105 35,218 -225 -0.63 4,360 -6.76 1.0653
2024-04-24 2024-03-31 13F MERCK COM 58933Y105 35,443 -80 -0.23 4,677 20.76 1.1073
2024-01-30 2023-12-31 13F MERCK COM 58933Y105 35,523 -227 -0.63 3,873 5.22 1.0016
2023-10-30 2023-09-30 13F MERCK COM 58933Y105 35,750 -488 -1.35 3,680 -11.98 1.0780
2023-07-20 2023-06-30 13F MERCK COM 58933Y105 36,238 -283 -0.77 4,181 7.62 1.1838
2023-04-20 2023-03-31 13F MERCK COM 58933Y105 36,521 204 0.56 3,885 -3.57 1.1735
2023-01-19 2022-12-31 13F MERCK COM 58933Y105 36,317 385 1.07 4,029 30.22 1.2692
2022-10-17 2022-09-30 13F MERCK COM 58933Y105 35,932 294 0.82 3,094 -4.77 1.1165
2022-07-15 2022-06-30 13F MERCK COM 58933Y105 35,638 151 0.43 3,249 11.57 1.1267
2022-04-25 2022-03-31 13F MERCK COM 58933Y105 35,487 -1,417 -3.84 2,912 2.97 0.9182
2022-01-20 2021-12-31 13F MERCK COM 58933Y105 36,904 547 1.50 2,828 3.55 0.8683
2021-10-14 2021-09-30 13F MERCK COM 58933Y105 36,357 7,864 27.60 2,731 23.24 0.9441
2021-07-22 2021-06-30 13F MERCK & CO INC COM Stock 58933Y105 28,493 -6,068 -17.56 2,216 -16.82 0.5786
2021-04-26 2021-03-31 13F MERCK &CO. COM 58933Y105 34,561 1,884 5.77 2,664 -0.34 1.0410
2021-01-19 2020-12-31 13F PNM RESOURCES COM 58933Y105 32,677 1,943 6.32 2,673 4.86 1.1871
2020-10-22 2020-09-30 13F MERCK &CO. INC COM Equities 58933Y105 30,734 1,084 3.66 2,549 11.16 1.3608
2020-07-20 2020-06-30 13F MERCK &CO. COM 58933Y105 29,650 6,356 27.29 2,293 27.96 1.3649
2020-05-05 2020-03-31 13F MERCK & CO INC NEW COM Equities 58933Y105 23,294 1,791 8.33 1,792 -8.38 1.3812
2020-01-31 2019-12-31 13F MERCK COM 58933Y105 21,503 211 0.99 1,956 9.15 1.2799
2019-10-15 2019-09-30 13F MERCK & CO INC NEW COM Equities 58933Y105 21,292 432 2.07 1,792 2.46 1.2692
2019-07-19 2019-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 20,860 1,021 5.15 1,749 6.00 1.2812
2019-05-14 2019-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 19,839 1,027 5.46 1,650 12.40 1.1904
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 18,812 -48 -0.25 1,468 9.72 1.2823
2018-11-14 2018-09-30 13F MERCK & CO INC NEW COM Equities 58933Y105 18,860 -171 -0.90 1,338 15.84 1.0716
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 19,031 -105 -0.55 1,155 10.84 1.0270
2018-05-15 2018-03-31 13F MERCK Equities 58933Y105 19,136 -56 -0.29 1,042 -3.52 0.9642
2018-03-09 2017-12-31 13F MERCK & CO INC NEW COM Equities 58933Y105 19,192 19,192 1,080 0.9970
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.