Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionBlume Capital Management, Inc.
Latest Disclosed Ownership1,400 shares
Latest Disclosed Value $ 168,406
Blume Capital Management, Inc. reports 15.15% decrease in ownership of 6MK / Merck & Co., Inc.

On May 1, 2026 - Blume Capital Management, Inc. filed a 13F-HR form disclosing ownership of 1,400 shares of Merck & Co., Inc. (BG:6MK) valued at $168,406 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 1,650 shares of Merck & Co., Inc.. This represents a change in shares of -15.15% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-01 2026-03-31 13F MERCK COM 58933Y105 1,400 -250 -15.15 168 -2.89 0.0286
2026-02-05 2025-12-31 13F MERCK COM 58933Y105 1,650 -8,254 -83.34 174 -79.18 0.0316
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 9,904 7,574 325.06 831 351.63 0.1579
2025-07-30 2025-06-30 13F MERCK COM 58933Y105 2,330 30 1.30 184 -10.68 0.0371
2025-05-06 2025-03-31 13F MERCK COM 58933Y105 2,300 0 0.00 206 -9.65 0.0462
2025-02-10 2024-12-31 13F MERCK COM 58933Y105 2,300 0 0.00 229 -12.64 0.0513
2024-10-29 2024-09-30 13F MERCK COM 58933Y105 2,300 0 0.00 261 -8.10 0.0584
2024-08-05 2024-06-30 13F MERCK COM 58933Y105 2,300 0 0.00 285 -6.27 0.0686
2024-05-02 2024-03-31 13F MERCK COM 58933Y105 2,300 -100 -4.17 303 16.09 0.0733
2024-05-02 2023-12-31 13F/A-1 MERCK COM 58933Y105 2,400 0 0.00 262 5.67 0.0684
2024-02-07 2023-12-31 13F MERCK COM 58933Y105 2,400 0 262 0.0684
2024-05-02 2023-09-30 13F/A-1 MERCK COM 58933Y105 2,400 -100 -4.00 247 -14.24 0.0731
2023-11-03 2023-09-30 13F MERCK COM 58933Y105 2,400 -100 247 0.0731
2024-05-02 2023-06-30 13F/A-1 MERCK COM 58933Y105 2,500 0 0.00 288 8.68 0.0844
2023-08-10 2023-06-30 13F MERCK COM 58933Y105 2,500 0 288 0.0844
2024-05-02 2023-03-31 13F/A-1 Merck COM 58933Y105 2,500 -200 -7.41 266 -11.37 0.0843
2023-05-08 2023-03-31 13F Merck COM 58933Y105 2,500 -200 266 0.0843
2023-02-08 2022-12-31 13F Merck COM 58933Y105 2,700 -200 -6.90 300 19.60 0.1012
2022-11-15 2022-09-30 13F MERCK COM 58933Y105 2,900 -172 -5.60 250 -10.71 0.0942
2022-08-11 2022-06-30 13F MERCK COM 58933Y105 3,072 734 31.39 280 45.83 0.1106
2022-05-12 2022-03-31 13F Merck COM 58933Y105 2,338 238 11.33 192 19.25 0.0633
2022-02-07 2021-12-31 13F Merck COM 58933Y105 2,100 0 0.00 161 1.90 0.0531
2021-11-12 2021-09-30 13F Merck COM 58933Y105 2,100 0 0.00 158 -3.07 0.0578
2021-08-10 2021-06-30 13F Merck COM 58933Y105 2,100 -207 -8.97 163 -8.43 0.0596
2021-05-10 2021-03-31 13F Merck COM 58933Y105 2,307 907 64.79 178 54.78 0.0701
2021-02-09 2020-12-31 13F Merck COM 58933Y105 1,400 0 0.00 115 -0.86 0.0492
2020-11-12 2020-09-30 13F Merck COM 58933Y105 1,400 0 0.00 116 7.41 0.0588
2020-08-06 2020-06-30 13F Merck COM 58933Y105 1,400 0 0.00 108 0.93 0.0598
2020-05-07 2020-03-31 13F Merck COM 58933Y105 1,400 0 0.00 107 -15.75 0.0685
2020-02-05 2019-12-31 13F Merck COM 58933Y105 1,400 0 0.00 127 8.55 0.0621
2019-11-12 2019-09-30 13F Merck COM 58933Y105 1,400 0 0.00 117 0.00 0.0584
2019-07-29 2019-06-30 13F Merck COM 58933Y105 1,400 0 0.00 117 0.86 0.0592
2019-05-06 2019-03-31 13F Merck COM 58933Y105 1,400 0 0.00 116 8.41 0.0609
2019-02-05 2018-12-31 13F Merck COM 58933Y105 1,400 0 0.00 107 8.08 0.0611
2018-11-02 2018-09-30 13F Merck COM 58933Y105 1,400 0 0.00 99 16.47 0.0517
2018-08-02 2018-06-30 13F Merck COM 58933Y105 1,400 0 0.00 85 11.84 0.0464
2018-05-04 2018-03-31 13F Merck COM 58933Y105 1,400 0 0.00 76 -3.80 0.0423
2018-02-09 2017-12-31 13F Merck COM 58933Y105 1,400 -210 -13.04 79 -23.30 0.0404
2018-02-14 2017-09-30 13F/A-1 Merck COM 58933Y105 1,610 0 0.00 103 0.00 0.0545
2017-11-13 2017-09-30 13F Merck COM 58933Y105 1,610 0 103
2017-08-08 2017-06-30 13F Merck COM 58933Y105 1,610 -100 -5.85 103 -5.50 0.0585
2017-05-12 2017-03-31 13F Merck COM 58933Y105 1,710 0 0.00 109 7.92 0.0631
2017-01-30 2016-12-31 13F Merck COM 58933Y105 1,710 0 0.00 101 -5.61 0.0607
2016-11-07 2016-09-30 13F Merck COM 58933Y105 1,710 210 14.00 107 24.42 0.0655
2016-08-11 2016-06-30 13F/A-1 Merck COM 58933Y105 1,500 0 0.00 86 8.86 0.0567
2016-08-04 2016-06-30 13F Merck COM 58933Y105 0 86
2016-05-12 2016-03-31 13F Merck COM 58933Y105 1,500 0 0.00 79 0.00 0.0546
2016-05-26 2015-12-31 13F/A-1 Merck COM 58933Y105 1,500 0 0.00 79 6.76 0.0559
2016-02-08 2015-12-31 13F MERCK & CO INC COM 58933Y105 1,500 79
2015-11-05 2015-09-30 13F MERCK & CO INC COM 58933Y105 1,500 0 0.00 74 -12.94 0.0600
2015-08-11 2015-06-30 13F MERCK & CO INC COM 58933Y105 1,500 -2,699 -64.28 85 -64.73 0.0643
2015-05-05 2015-03-31 13F MERCK & CO INC COM 58933Y105 4,199 -277 -6.19 241 -5.12 0.1671
2015-02-10 2014-12-31 13F MERCK & CO INC COM 58933Y105 4,476 -9,864 -68.79 254 -64.62 0.1790
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 14,340 14,340 718 0.5939
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.