Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCanandaigua National Corp
Latest Disclosed Ownership86,888 shares
Latest Disclosed Value $ 10,451,758
Canandaigua National Corp reports 23.22% decrease in ownership of MRK / Merck & Co., Inc.

On April 8, 2026 - Canandaigua National Corp filed a 13F-HR form disclosing ownership of 86,888 shares of Merck & Co., Inc. (MX:MRK) valued at $10,451,758 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 25, 2023 disclosing 113,164 shares of Merck & Co., Inc.. This represents a change in shares of -23.22% 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)
2026-04-08 2026-03-31 13F Merck & Co Inc Com 58933Y105 86,888 -26,276 -23.22 10,452 86,991.67 0.9356
2023-01-25 2022-12-31 13F Merck & Co Inc Com 58933Y105 113,164 15 0.01 13 -99.88 0.0021
2022-10-05 2022-09-30 13F Merck & Co Inc Com 58933Y105 113,149 9,863 9.55 9,744 3.47 1.7310
2022-07-05 2022-06-30 13F Merck & Co Inc Com 58933Y105 103,286 -3,326 -3.12 9,417 7.65 1.6678
2022-05-09 2022-03-31 13F Merck & Co Inc Com 58933Y105 106,612 20,218 23.40 8,748 32.13 1.3307
2022-01-04 2021-12-31 13F Merck & Co Inc Com 58933Y105 86,394 6,445 8.06 6,621 10.26 0.9771
2021-10-04 2021-09-30 13F Merck & Co Inc Com 58933Y105 79,949 119 0.15 6,005 -3.27 0.9778
2021-07-06 2021-06-30 13F Merck & Co Inc Com 58933Y105 79,830 -299 -0.37 6,208 0.50 1.0073
2021-04-05 2021-03-31 13F Merck & Co Inc Com 58933Y105 80,129 -2,037 -2.48 6,177 -8.09 1.0440
2021-02-11 2020-12-31 13F Merck & Co Inc Com 58933Y105 82,166 -8,261 -9.14 6,721 -10.40 1.1807
2020-10-19 2020-09-30 13F Merck & Co Inc Com 58933Y105 90,427 1,449 1.63 7,501 9.01 1.3264
2020-07-07 2020-06-30 13F Merck & Co Inc Com 58933Y105 88,978 88,978 6,881 1.2638
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.