Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionLittle House Capital Llc
Latest Disclosed Ownership25,476 shares
Latest Disclosed Value $ 3,064,483
Little House Capital Llc reports 87.12% increase in ownership of MRK / Merck & Co., Inc.

On May 7, 2026 - Little House Capital Llc filed a 13F-HR form disclosing ownership of 25,476 shares of Merck & Co., Inc. (MX:MRK) valued at $3,064,483 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 13,615 shares of Merck & Co., Inc.. This represents a change in shares of 87.12% 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)
2026-05-07 2026-03-31 13F MERCK COM 58933Y105 25,476 11,861 87.12 3,064 113.82 0.7911
2026-02-06 2025-12-31 13F MERCK COM 58933Y105 13,615 -1,806 -11.71 1,433 10.74 0.3597
2025-11-03 2025-09-30 13F MERCK COM 58933Y105 15,421 -9,815 -38.89 1,294 -35.20 0.2975
2025-07-08 2025-06-30 13F MERCK COM 58933Y105 25,236 308 1.24 1,998 -10.73 0.5004
2025-04-25 2025-03-31 13F MERCK COM 58933Y105 24,928 697 2.88 2,238 -7.18 0.6150
2025-01-30 2024-12-31 13F MERCK COM 58933Y105 24,231 -6,120 -20.16 2,411 -30.06 0.6887
2024-10-21 2024-09-30 13F MERCK COM 58933Y105 30,351 1,399 4.83 3,447 -3.85 0.9887
2024-08-02 2024-06-30 13F MERCK COM 58933Y105 28,952 -56 -0.19 3,584 -6.35 1.1210
2024-04-18 2024-03-31 13F MERCK COM 58933Y105 29,008 1,065 3.81 3,828 25.64 1.2678
2024-02-05 2023-12-31 13F MERCK COM 58933Y105 27,943 28 0.10 3,046 6.02 1.1112
2023-10-30 2023-09-30 13F MERCK COM 58933Y105 27,915 4,000 16.73 2,874 4.13 1.1804
2023-07-18 2023-06-30 13F MERCK COM 58933Y105 23,915 907 3.94 2,760 12.75 1.1727
2023-05-04 2023-03-31 13F MERCK COM 58933Y105 23,008 -6,300 -21.50 2,448 -24.73 1.1521
2023-02-13 2022-12-31 13F Merck Equity 58933Y105 29,308 783 2.74 3,252 32.32 1.6091
2022-11-14 2022-09-30 13F Merck Equity 58933Y105 28,525 2,575 9.92 2,457 3.85 1.3080
2022-08-12 2022-06-30 13F Merck Equity 58933Y105 25,950 4,571 21.38 2,366 34.89 1.2730
2022-05-16 2022-03-31 13F Merck Equity 58933Y105 21,379 5,756 36.84 1,754 46.53 0.8976
2022-02-15 2021-12-31 13F Merck Equity 58933Y105 15,623 -28 -0.18 1,197 1.79 0.6331
2021-11-15 2021-09-30 13F Merck Equity 58933Y105 15,651 -321 -2.01 1,176 -5.31 0.6896
2021-08-16 2021-06-30 13F Merck Equity 58933Y105 15,972 -25,871 -61.83 1,242 -61.49 0.6713
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 41,843 36,853 738.54 3,225 690.44 1.1400
2021-02-12 2020-12-31 13F Merck Equity 58933Y105 4,990 393 8.55 408 7.09 0.3011
2020-11-13 2020-09-30 13F Merck Equity 58933Y105 4,597 0 0.00 381 7.32 0.3165
2020-08-14 2020-06-30 13F/A-1 Merck Equity 58933Y105 4,597 -778 -14.47 355 -14.25 0.3271
2020-05-15 2020-03-31 13F Merck Equity 58933Y105 5,375 -98 -1.79 414 -17.37 0.4506
2020-02-12 2019-12-31 13F Merck Equity 58933Y105 5,473 894 19.52 501 29.12 0.4324
2019-11-05 2019-09-30 13F Merck Equity 58933Y105 4,579 71 1.57 388 4.86 0.2937
2019-08-15 2019-06-30 13F/A-1 Merck Equity 58933Y105 4,508 36 0.81 370 -1.07 0.2471
2019-05-15 2019-03-31 13F Merck Equity 58933Y105 4,472 -46 -1.02 374 7.47 0.2802
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 4,518 4,518 348 0.3360
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.