Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCI Private Wealth, LLC
Latest Disclosed Ownership2,428,276 shares
Latest Disclosed Value $ 291,202,960
CI Private Wealth, LLC reports 0.20% decrease in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - CI Private Wealth, LLC filed a 13F-HR form disclosing ownership of 2,428,276 shares of Merck & Co., Inc. (MX:MRK) valued at $291,202,960 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on March 9, 2026 disclosing 2,433,240 shares of Merck & Co., Inc.. This represents a change in shares of -0.20% 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)
2026-05-15 2026-03-31 13F MERCK COM 58933Y105 2,428,276 -4,964 -0.20 291,203 13.65 0.4058
2026-03-09 2025-12-31 13F/A-1 MERCK COM 58933Y105 2,433,240 6,174 0.25 256,218 26.43 0.3484
2026-02-19 2025-12-31 13F MERCK COM 58933Y105 5,210,548 2,783,482 492,431 0.1853
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 2,427,066 -2,510,882 -50.85 202,661 -48.15 0.3194
2025-09-26 2025-06-30 13F/A-1 MERCK COM 58933Y105 4,937,948 2,277,088 85.58 390,896 63.66 0.5201
2025-08-15 2025-06-30 13F MERCK COM 58933Y105 2,539,102 -121,758 200,892 0.2115
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 2,660,860 -454,904 -14.60 238,852 -22.85 0.3901
2025-02-10 2024-12-31 13F MERCK COM 58933Y105 3,115,764 -583,104 -15.76 309,581 -26.30 0.5137
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 3,698,868 204,837 5.86 420,043 -2.90 0.6556
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 3,494,031 -95,209 -2.65 432,571 -8.66 0.7535
2024-05-09 2024-03-31 13F MERCK COM 58933Y105 3,589,240 32,978 0.93 473,606 22.15 0.8432
2024-02-09 2023-12-31 13F MERCK COM 58933Y105 3,556,262 230,196 6.92 387,709 13.22 0.7131
2023-11-03 2023-09-30 13F MERCK COM 58933Y105 3,326,066 77,673 2.39 342,441 -8.65 0.7870
2023-08-10 2023-06-30 13F MERCK COM 58933Y105 3,248,393 802,025 32.78 374,860 44.01 0.8648
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 2,446,368 705,674 40.54 260,309 34.76 0.6990
2023-02-15 2022-12-31 13F MERCK COM 58933Y105 1,740,694 1,740,694 193,160 0.7015
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.