Merck & Co., Inc.
US ˙ NYSE ˙ US58933Y1055

SecurityMRK / Merck & Co., Inc.
InstitutionMorse Asset Management, Inc
Latest Disclosed Ownership32,828 shares
Latest Disclosed Value $ 3,948,880
Morse Asset Management, Inc reports 14.86% increase in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Morse Asset Management, Inc filed a 13F-HR form disclosing ownership of 32,828 shares of Merck & Co., Inc. (US:MRK) valued at $3,948,880 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 28,581 shares of Merck & Co., Inc.. This represents a change in shares of 14.86% during the quarter. The current value of the position is $3,965,294 USD.

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 & CO INC COM Stock 58933Y105 32,828 4,247 14.86 3,949 31.25 0.8208
2026-02-03 2025-12-31 13F MERCK & CO INC COM Stock 58933Y105 28,581 5,805 25.49 3,008 57.40 0.6013
2025-11-14 2025-09-30 13F MERCK & CO INC COM Stock 58933Y105 22,776 989 4.54 1,912 10.85 0.3815
2025-08-15 2025-06-30 13F MERCK & CO INC COM Stock 58933Y105 21,787 1,733 8.64 1,725 -4.22 0.3779
2025-05-05 2025-03-31 13F MERCK & CO INC COM Stock 58933Y105 20,054 -2,150 -9.68 1,800 -18.48 0.4544
2025-02-14 2024-12-31 13F MERCK & CO INC COM Stock 58933Y105 22,204 -5,200 -18.98 2,209 -29.03 0.5046
2024-11-20 2024-09-30 13F/A-1 MERCK & CO INC COM Stock 58933Y105 27,404 -14,932 -35.27 3,112 62,120.00 0.6717
2024-11-14 2024-09-30 13F MERCK & CO INC COM Stock 58933Y105 27,404 -14,932 3 0.6703
2024-08-14 2024-06-30 13F Merck COM 58933Y105 42,336 7,893 22.92 5 25.00 1.2710
2024-05-15 2024-03-31 13F Merck COM 58933Y105 34,443 9,909 40.39 5 100.00 1.1597
2024-02-15 2023-12-31 13F Merck COM 58933Y105 24,534 -7,681 -23.84 3 -33.33 0.7874
2023-11-13 2023-09-30 13F Merck COM 58933Y105 32,215 -4,325 -11.84 3 -25.00 1.0493
2023-08-14 2023-06-30 13F Merck COM 58933Y105 36,540 11,210 44.26 4 100.00 1.2822
2023-05-03 2023-03-31 13F Merck COM 58933Y105 25,330 -2,162 -7.86 3 -33.33 0.9107
2023-02-08 2022-12-31 13F Merck COM 58933Y105 27,492 -488 -1.74 3 -99.88 1.1079
2022-11-14 2022-09-30 13F Merck COM 58933Y105 27,980 -875 -3.03 2,410 -8.40 0.9099
2022-08-11 2022-06-30 13F Merck COM 58933Y105 28,855 2,690 10.28 2,631 22.54 0.8442
2022-05-12 2022-03-31 13F Merck COM 58933Y105 26,165 600 2.35 2,147 9.60 0.5337
2022-02-14 2021-12-31 13F Merck COM 58933Y105 25,565 65 0.25 1,959 2.30 0.4375
2021-11-09 2021-09-30 13F Merck COM 58933Y105 25,500 0 0.00 1,915 -3.43 0.4560
2021-08-13 2021-06-30 13F Merck COM 58933Y105 25,500 -1,000 -3.77 1,983 -2.94 0.4792
2021-05-13 2021-03-31 13F/A-1 Merck COM 58933Y105 26,500 -3,000 -10.17 2,043 -15.33 0.5242
2021-05-13 2021-03-31 13F Merck COM 58933Y105 26,500 -3,000 2,043 0.5242
2021-02-11 2020-12-31 13F Merck COM 58933Y105 29,500 -1,000 -3.28 2,413 -4.62 0.6691
2020-11-09 2020-09-30 13F Merck COM 58933Y105 30,500 0 0.00 2,530 7.25 0.8112
2020-08-14 2020-06-30 13F Merck COM 58933Y105 30,500 3,000 10.91 2,359 11.48 0.8403
2020-05-01 2020-03-31 13F Merck COM 58933Y105 27,500 -725 -2.57 2,116 -17.57 1.0102
2020-01-31 2019-12-31 13F Merck COM 58933Y105 28,225 -251 -0.88 2,567 7.09 0.8802
2019-11-05 2019-09-30 13F Merck COM 58933Y105 28,476 0 0.00 2,397 0.38 0.8959
2019-08-01 2019-06-30 13F Merck COM 58933Y105 28,476 500 1.79 2,388 2.62 0.7033
2019-05-02 2019-03-31 13F Merck COM 58933Y105 27,976 0 0.00 2,327 8.84 0.6976
2019-02-13 2018-12-31 13F Merck COM 58933Y105 27,976 0 0.00 2,138 7.71 0.7592
2018-11-01 2018-09-30 13F Merck COM 58933Y105 27,976 0 0.00 1,985 16.90 0.5231
2018-08-15 2018-06-30 13F Merck COM 58933Y105 27,976 0 0.00 1,698 11.42 0.4653
2018-05-02 2018-03-31 13F Merck COM 58933Y105 27,976 -3,100 -9.98 1,524 -12.86 0.4221
2018-01-29 2017-12-31 13F Merck COM 58933Y105 31,076 -11,275 -26.62 1,749 -35.51 0.4867
2017-10-31 2017-09-30 13F Merck COM 58933Y105 42,351 -3,180 -6.98 2,712 -7.06 0.8081
2017-08-01 2017-06-30 13F Merck COM 58933Y105 45,531 2,280 5.27 2,918 6.19 0.9501
2017-05-04 2017-03-31 13F Merck COM 58933Y105 43,251 43,251 2,748 0.9376
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.