Merck & Co., Inc.
CH ˙ SWX ˙ US58933Y1055
SecurityCH:MRK / Merck & Co., Inc.
InstitutionNixon Peabody Trust Co
Latest Disclosed Ownership78,707 shares
Latest Disclosed Value $ 9,467,676
Nixon Peabody Trust Co reports 1.74% decrease in ownership of MRK / Merck & Co., Inc.

On April 27, 2026 - Nixon Peabody Trust Co filed a 13F-HR form disclosing ownership of 78,707 shares of Merck & Co., Inc. (CH:MRK) valued at $9,467,676 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 80,097 shares of Merck & Co., Inc.. This represents a change in shares of -1.74% 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)
2026-04-27 2026-03-31 13F Merck Com 58933Y105 78,707 -1,390 -1.74 9,468 12.29 0.7524
2026-02-06 2025-12-31 13F Merck Com 58933Y105 80,097 -182 -0.23 8,431 25.14 0.6384
2025-10-17 2025-09-30 13F Merck Com 58933Y105 80,279 -851 -1.05 6,738 4.91 0.4934
2025-08-08 2025-06-30 13F Merck Com 58933Y105 81,130 -887 -1.08 6,422 -12.76 0.4974
2025-04-10 2025-03-31 13F Merck Com 58933Y105 82,017 -1,993 -2.37 7,362 -11.92 0.6250
2025-02-05 2024-12-31 13F Merck Com 58933Y105 84,010 1,801 2.19 8,357 -10.48 0.6885
2024-11-07 2024-09-30 13F Merck Com 58933Y105 82,209 -352 -0.43 9,336 -8.67 0.7775
2024-07-26 2024-06-30 13F Merck Com 58933Y105 82,561 11,944 16.91 10,221 9.70 0.9083
2024-05-07 2024-03-31 13F Merck Com 58933Y105 70,617 2,327 3.41 9,318 25.16 0.8555
2024-02-09 2023-12-31 13F Merck Com 58933Y105 68,290 65,815 2,659.19 7,445 2,830.71 0.8348
2023-10-23 2023-09-30 13F Merck Com 58933Y105 2,475 -495 -16.67 255 -25.73 0.2134
2023-07-27 2023-06-30 13F Merck Com 58933Y105 2,970 0 0.00 343 8.57 0.2779
2023-05-12 2023-03-31 13F Merck Com 58933Y105 2,970 -1,967 -39.84 316 -42.41 0.2210
2023-02-09 2022-12-31 13F Merck Com 58933Y105 4,937 42 0.86 548 29.93 0.4444
2023-03-15 2022-09-30 13F/A-1 Merck Com 58933Y105 4,895 -44,954 -90.18 422 -90.74 0.3575
2022-08-11 2022-06-30 13F Merck Com 58933Y105 49,849 -600 -1.19 4,545 9.81 2.0543
2022-05-13 2022-03-31 13F Merck Com 58933Y105 50,449 -2,325 -4.41 4,139 2.32 1.4246
2022-02-08 2021-12-31 13F Merck Com 58933Y105 52,774 22,488 74.25 4,045 77.80 1.2248
2021-11-04 2021-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 30,286 2,475 8.90 2,275 5.18 0.8220
2021-07-30 2021-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 27,811 -98 -0.35 2,163 0.51 0.8333
2021-04-26 2021-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 27,909 320 1.16 2,152 -4.65 0.8723
2021-02-10 2020-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 27,589 19,883 258.02 2,257 253.21 0.9522
2020-11-03 2020-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 7,706 0 0.00 639 7.21 0.2943
2020-08-13 2020-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 7,706 -255 -3.20 596 -2.77 0.3025
2020-04-23 2020-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 7,961 1,619 25.53 613 6.24 0.3788
2020-01-24 2019-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 6,342 -2,660 -29.55 577 -23.88 0.2874
2019-11-04 2019-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 9,002 -4,315 -32.40 758 -32.14 0.4037
2019-08-01 2019-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 13,317 1,550 13.17 1,117 14.10 0.6293
2019-04-19 2019-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 11,767 -1,606 -12.01 979 -4.11 0.6416
2019-01-23 2018-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 13,373 393 3.03 1,021 10.86 0.8046
2018-10-25 2018-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 12,980 954 7.93 921 26.16 0.6294
2018-07-30 2018-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 12,026 257 2.18 730 13.88 0.5659
2018-04-27 2018-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 11,769 -150 -1.26 641 -4.47 0.5746
2018-02-05 2017-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 11,919 -200 -1.65 671 -13.53 0.5781
2017-11-01 2017-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 12,119 -400 -3.20 776 -3.36 0.7049
2017-07-17 2017-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 12,519 200 1.62 803 2.55 0.7433
2017-04-06 2017-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 12,319 0 0.00 783 8.00 0.7369
2017-01-18 2016-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 12,319 -2,000 -13.97 725 -18.90 0.7060
2016-10-24 2016-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 14,319 -6,016 -29.58 894 -23.65 0.8776
2016-07-08 2016-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 20,335 -225 -1.09 1,171 7.73 1.0168
2016-04-20 2016-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 20,560 0 0.00 1,087 0.09 0.9668
2016-01-13 2015-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 20,560 20,560 1,086 0.9899
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.