Merck & Co., Inc.
CL ˙ SNSE ˙ US58933Y1055
SecurityCL:MRKCL / Merck & Co., Inc.
InstitutionSlateStone Wealth, LLC
Latest Disclosed Ownership122,534 shares
Latest Disclosed Value $ 14,740
SlateStone Wealth, LLC reports 2.64% increase in ownership of MRKCL / Merck & Co., Inc.

On May 14, 2026 - SlateStone Wealth, LLC filed a 13F-HR form disclosing ownership of 122,534 shares of Merck & Co., Inc. (CL:MRKCL) valued at $14,740 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 119,387 shares of Merck & Co., Inc.. This represents a change in shares of 2.64% 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)
2026-05-14 2026-03-31 13F Merck COM 58933Y105 122,534 3,147 2.64 15 16.67 1.2151
2026-02-11 2025-12-31 13F Merck COM 58933Y105 119,387 477 0.40 13 33.33 1.0516
2025-11-05 2025-09-30 13F Merck COM 58933Y105 118,910 875 0.74 10 0.00 0.8639
2025-08-12 2025-06-30 13F Merck COM 58933Y105 118,035 2,284 1.97 9 -10.00 0.8736
2025-05-08 2025-03-31 13F Merck COM 58933Y105 115,751 1,890 1.66 10 -9.09 1.0429
2025-02-10 2024-12-31 13F Merck COM 58933Y105 113,861 1,251 1.11 11 -8.33 1.1111
2024-11-07 2024-09-30 13F Merck COM 58933Y105 112,610 35,321 45.70 13 33.33 1.1515
2024-07-25 2024-06-30 13F Merck COM 58933Y105 77,289 -30,810 -28.50 10 -35.71 1.0368
2024-04-26 2024-03-31 13F Merck COM 58933Y105 108,099 33,541 44.99 14 75.00 1.4323
2024-02-01 2023-12-31 13F Merck COM 58933Y105 74,558 4,228 6.01 8 14.29 1.0549
2023-10-12 2023-09-30 13F Merck COM 58933Y105 70,330 29,210 71.04 7 75.00 1.0531
2023-08-07 2023-06-30 13F Merck COM 58933Y105 41,120 -970 -2.30 5 0.00 0.8890
2023-08-08 2023-03-31 13F Merck COM 58933Y105 42,090 4,408 11.70 4 -99.90 0.9273
2023-02-01 2022-12-31 13F Merck COM 58933Y105 37,682 1,432 3.95 4,181 33.89 1.0086
2022-11-03 2022-09-30 13F Merck COM 58933Y105 36,250 305 0.85 3,122 -4.73 0.8307
2022-08-04 2022-06-30 13F Merck COM 58933Y105 35,945 3,872 12.07 3,277 24.51 0.8371
2022-05-04 2022-03-31 13F Merck COM 58933Y105 32,073 10,582 49.24 2,632 59.81 0.5869
2022-02-02 2021-12-31 13F Merck COM 58933Y105 21,491 -221 -1.02 1,647 0.98 0.3519
2021-10-28 2021-09-30 13F Merck & COM 58933Y105 21,712 -500 -2.25 1,631 -5.56 0.3734
2021-08-02 2021-06-30 13F Merck & COM 58933Y105 22,212 -1,830 -7.61 1,727 -6.85 0.3949
2021-04-19 2021-03-31 13F Merck & COM 58933Y105 24,042 18,385 325.00 1,854 300.43 0.4580
2021-01-25 2020-12-31 13F Merck COM 58933Y105 5,657 -349 -5.81 463 -7.03 0.1155
2020-10-27 2020-09-30 13F Merck COM 58933Y105 6,006 -370 -5.80 498 1.01 0.1075
2020-07-29 2020-06-30 13F Merck & COM 58933Y105 6,376 -20,282 -76.08 493 -75.96 0.1102
2020-04-28 2020-03-31 13F Merck & COM 58933Y105 26,658 -1,609 -5.69 2,051 -20.23 0.5834
2020-02-06 2019-12-31 13F Merck & COM 58933Y105 28,267 3,587 14.53 2,571 23.72 0.5879
2019-11-05 2019-09-30 13F Merck COM 58933Y105 24,680 2,110 9.35 2,078 9.83 0.6067
2019-08-05 2019-06-30 13F Merck COM 58933Y105 22,570 359 1.62 1,892 2.44 0.5328
2019-05-06 2019-03-31 13F Merck COM 58933Y105 22,211 12,563 130.21 1,847 150.61 0.5672
2019-02-13 2018-12-31 13F Merck COM 58933Y105 9,648 9,648 737 0.3389
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.