Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionSectoral Asset Management Inc
Latest Disclosed Ownership21,480 shares
Latest Disclosed Value $ 2,583,829
Sectoral Asset Management Inc reports 0.37% increase in ownership of 6MK / Merck & Co., Inc.

On May 15, 2026 - Sectoral Asset Management Inc filed a 13F-HR form disclosing ownership of 21,480 shares of Merck & Co., Inc. (BG:6MK) valued at $2,583,829 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 21,400 shares of Merck & Co., Inc.. This represents a change in shares of 0.37% 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)
2026-05-15 2026-03-31 13F MERCK COM 58933Y105 21,480 80 0.37 2,584 14.70 2.1402
2026-02-09 2025-12-31 13F MERCK COM 58933Y105 21,400 5,000 30.49 2,253 62.60 1.8056
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 16,400 -4,500 -21.53 1,386 -16.87 0.8553
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 20,900 -6,000 -22.30 1,666 -30.99 1.1001
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 26,900 2,400 9.80 2,415 -0.94 1.8793
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 24,500 500 2.08 2,437 -10.57 1.6268
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 24,000 -62,500 -72.25 2,725 -74.55 1.6098
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 86,500 0 0.00 10,709 -6.18 4.3521
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 86,500 7,000 8.81 11,414 31.68 4.4869
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 79,500 24,500 44.55 8,667 53.07 3.7322
2023-11-14 2023-09-30 13F MERCK COMMON 58933Y105 55,000 0 0.00 5,662 -10.78 1.1026
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 55,000 0 0.00 6,346 8.46 1.0581
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 55,000 0 0.00 5,851 -4.11 1.1246
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 55,000 -2,750 -4.76 6,102 22.70 1.1808
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 57,750 0 0.00 4,973 -5.55 0.9797
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 57,750 0 0.00 5,265 11.12 1.0609
2022-05-10 2022-03-31 13F MERCK COM 58933Y105 57,750 7,500 14.93 4,738 23.03 0.8411
2022-02-11 2021-12-31 13F MERCK COM 58933Y105 50,250 -25,000 -33.22 3,851 -31.86 0.5796
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 75,250 0 0.00 5,652 -3.42 0.4701
2021-08-16 2021-06-30 13F MERCK COM 58933Y105 75,250 75,250 5,852 0.4735
2021-05-14 2021-03-31 13F MERCK & CO. COM 58933Y105 0 -44,500 -100.00 0 -100.00
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 44,500 -6,000 -11.88 3,640 -13.11 0.2565
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 50,500 -46,650 -48.02 4,189 -44.24 0.3601
2020-08-13 2020-06-30 13F MERCK COM 58933Y105 97,150 -5,250 -5.13 7,513 -4.65 0.6896
2020-05-13 2020-03-31 13F MERCK COM 58933Y105 102,400 -11,000 -9.70 7,879 -23.61 1.5125
2020-02-12 2019-12-31 13F MERCK COM 58933Y105 113,400 -4,200 -3.57 10,314 4.18 1.5389
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 117,600 -49,200 -29.50 9,900 -29.21 1.7079
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 166,800 2,100 1.28 13,986 2.10 1.6724
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 164,700 164,700 -1.26 13,698 -2.06 1.6476
2018-05-15 2018-03-31 13F MERCK COMMON 58933Y105 0 -108,501 -100.00 0 -100.00
2018-02-13 2017-12-31 13F MERCK COMMON 58933Y105 108,501 -216,779 -66.64 6,105 -70.69 0.7628
2017-11-14 2017-09-30 13F MERCK COMMON 58933Y105 325,280 -404,203 -55.41 20,828 -55.45 2.6829
2017-08-14 2017-06-30 13F MERCK COMMON 58933Y105 729,483 8,501 1.18 46,753 2.06 5.1129
2017-05-15 2017-03-31 13F MERCK COMMON 58933Y105 720,982 -252,850 -25.96 45,811 -20.09 5.3499
2017-02-10 2016-12-31 13F MERCK COMMON 58933Y105 973,832 48,662 5.26 57,329 -0.71 6.3510
2016-11-10 2016-09-30 13F MERCK COMMON 58933Y105 925,170 182,210 24.52 57,740 34.90 5.6680
2016-08-12 2016-06-30 13F MERCK COMMON 58933Y105 742,960 -6,954 -0.93 42,802 7.87 4.4198
2016-05-13 2016-03-31 13F MERCK COMMON 58933Y105 749,914 -372,011 -33.16 39,678 -33.04 1.9185
2016-02-12 2015-12-31 13F MERCK COMMON 58933Y105 1,121,925 24,549 2.24 59,260 9.34 2.5267
2015-11-13 2015-09-30 13F MERCK COMMON 58933Y105 1,097,376 483,534 78.77 54,199 55.09 2.4829
2015-08-13 2015-06-30 13F MERCK COMMON 58933Y105 613,842 613,842 -44.06 34,946 -35.52 1.4576
2014-11-13 2014-09-30 13F MERCK COMMON 58933Y105 0 -654,582 -100.00 0 -100.00
2014-08-14 2014-06-30 13F MERCK COMMON 58933Y105 654,582 -12,955 -1.94 37,868 -0.07 1.6045
2014-05-14 2014-03-31 13F MERCK COMMON 58933Y105 667,537 -427,146 -39.02 37,896 -30.83 1.5588
2014-02-12 2013-12-31 13F MERCK COMMON 58933Y105 1,094,683 91,944 9.17 54,789 14.77 2.3627
2013-11-13 2013-09-30 13F MERCK COMMON 58933Y105 1,002,739 -1,572,590 -61.06 47,740 -60.09 2.2970
2013-08-12 2013-06-30 13F MERCK COMMON 58933Y105 2,575,329 2,575,329 119,624 3.5373
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.