Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionMathes Company, Inc.
Latest Disclosed Ownership4,915 shares
Latest Disclosed Value $ 591
Mathes Company, Inc. reports 0.20% decrease in ownership of 6MK / Merck & Co., Inc.

On May 8, 2026 - Mathes Company, Inc. filed a 13F-HR form disclosing ownership of 4,915 shares of Merck & Co., Inc. (BG:6MK) valued at $591 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 4,925 shares of Merck & Co., Inc..

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)
2026-05-08 2026-03-31 13F Merck & Co COM 58933Y105 4,915 -10 -0.20 1 0.2159
2026-02-09 2025-12-31 13F Merck & Co COM 58933Y105 4,925 0 0.00 1 0.1847
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 4,925 0 0.00 0 0.1483
2025-08-05 2025-06-30 13F Merck & Co COM 58933Y105 4,925 -50 -1.01 0 0.1447
2025-05-01 2025-03-31 13F MERCK COM 58933Y105 4,975 -550 -9.95 0 0.1818
2025-01-31 2024-12-31 13F Merck & Co COM 58933Y105 5,525 0 0.00 1 0.2007
2024-10-29 2024-09-30 13F Merck & Co COM 58933Y105 5,525 -25 -0.45 1 0.2212
2024-08-12 2024-06-30 13F Merck & Co COM 58933Y105 5,550 -1,000 -15.27 1 0.2494
2024-05-02 2024-03-31 13F Merck & Co COM 58933Y105 6,550 0 0.00 1 0.3237
2024-01-30 2023-12-31 13F Merck & Co COM 58933Y105 6,550 0 0.00 1 0.2942
2023-10-26 2023-09-30 13F Merck & Co COM 58933Y105 6,550 0 0.00 1 0.3128
2023-07-25 2023-06-30 13F Merck & Co COM 58933Y105 6,550 -1,544 -19.08 1 0.3308
2023-01-25 2022-12-31 13F MERCK COM 58933Y105 8,094 0 0.00 1 -100.00 0.4532
2022-10-18 2022-09-30 13F Merck & Co COM 58933Y105 8,094 0 0.00 697 -5.56 0.3886
2022-08-01 2022-06-30 13F Merck & Co COM 58933Y105 8,094 -123 -1.50 738 9.50 0.3588
2022-06-15 2022-03-31 13F Merck & Co COM 58933Y105 8,217 0 0.00 674 6.98 0.2613
2022-02-04 2021-12-31 13F Merck & Co COM 58933Y105 8,217 -1,238 -13.09 630 -11.27 0.2155
2021-10-29 2021-09-30 13F Merck & Co COM 58933Y105 9,455 0 0.00 710 -3.40 0.2634
2021-07-20 2021-06-30 13F Merck & Co COM 58933Y105 9,455 -900 -8.69 735 -7.89 0.2645
2021-04-28 2021-03-31 13F Merck & Co COM 58933Y105 10,355 0 0.00 798 -5.79 0.3081
2021-01-20 2020-12-31 13F Merck & Co COM 58933Y105 10,355 -150 -1.43 847 -2.76 0.3439
2020-10-26 2020-09-30 13F Merck & Co COM 58933Y105 10,505 0 0.00 871 7.27 0.4058
2020-07-27 2020-06-30 13F Merck & Co COM 58933Y105 10,505 -1,000 -8.69 812 -8.25 0.4039
2020-04-21 2020-03-31 13F Merck & Co COM 58933Y105 11,505 -60 -0.52 885 -15.87 0.5885
2020-01-30 2019-12-31 13F Merck & Co COM 58933Y105 11,565 -1,117 -8.81 1,052 -1.50 0.4913
2019-10-21 2019-09-30 13F Merck & Co COM 58933Y105 12,682 0 0.00 1,068 0.47 0.5509
2019-07-29 2019-06-30 13F Merck & Co COM 58933Y105 12,682 -3,235 -20.32 1,063 -19.71 0.5628
2019-05-01 2019-03-31 13F Merck & Co COM 58933Y105 15,917 -6,050 -27.54 1,324 -21.10 0.6740
2019-01-29 2018-12-31 13F Merck & Co COM 58933Y105 21,967 0 0.00 1,678 7.70 1.0586
2018-10-31 2018-09-30 13F Merck & Co COM 58933Y105 21,967 -335 -1.50 1,558 15.07 0.7274
2018-07-27 2018-06-30 13F Merck & Co COM 58933Y105 22,302 200 0.90 1,354 12.46 0.6459
2018-04-27 2018-03-31 13F Merck & Co COM 58933Y105 22,102 3,330 17.74 1,204 14.02 0.5622
2018-01-19 2017-12-31 13F Merck & Co COM 58933Y105 18,772 -1,900 -9.19 1,056 -20.24 0.4831
2017-10-20 2017-09-30 13F Merck & Co COM 58933Y105 20,672 -2,266 -9.88 1,324 -9.93 0.6235
2017-07-17 2017-06-30 13F Merck & Co COM 58933Y105 22,938 -75 -0.33 1,470 0.55 0.7037
2017-04-24 2017-03-31 13F Merck & Co COM 58933Y105 23,013 -260 -1.12 1,462 6.72 0.7774
2017-01-27 2016-12-31 13F Merck & Co COM 58933Y105 23,273 -2,350 -9.17 1,370 -14.32 0.7546
2016-10-31 2016-09-30 13F Merck & Co COM 58933Y105 25,623 -950 -3.58 1,599 4.44 0.9065
2016-08-15 2016-06-30 13F Merck & Co COM 58933Y105 26,573 -879 -3.20 1,531 5.44 0.8932
2016-04-25 2016-03-31 13F Merck & Co COM 58933Y105 27,452 -935 -3.29 1,452 -3.14 0.8718
2016-01-28 2015-12-31 13F Merck & Co COM 58933Y105 28,387 -325 -1.13 1,499 5.71 0.8512
2015-11-03 2015-09-30 13F Merck & Co COM 58933Y105 28,712 600 2.13 1,418 -11.37 0.9358
2015-07-31 2015-06-30 13F Merck & Co COM 58933Y105 28,112 -300 -1.06 1,600 -2.02 0.8548
2015-04-24 2015-03-31 13F Merck & Co COM 58933Y105 28,412 28,412 0.00 1,633 0.8379
2015-01-29 2014-12-31 13F Merck & Co COM 58933Y105 0 -28,992 -100.00 0 -100.00
2014-10-27 2014-09-30 13F Merck & Co COM 58933Y105 28,992 -700 -2.36 1,719 0.06 0.8659
2014-08-05 2014-06-30 13F Merck & Co COM 58933Y105 29,692 -275 -0.92 1,718 1.00 0.8494
2014-04-24 2014-03-31 13F Merck & Co COM 58933Y105 29,967 6 0.02 1,701 13.40 0.9113
2014-01-30 2013-12-31 13F Merck & Co COM 58933Y105 29,961 29,961 1,500 0.8055
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.