Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionChesapeake Wealth Management
Latest Disclosed Ownership14,755 shares
Latest Disclosed Value $ 1,774,878
Chesapeake Wealth Management reports 0.10% increase in ownership of 6MK / Merck & Co., Inc.

On May 18, 2026 - Chesapeake Wealth Management filed a 13F-HR form disclosing ownership of 14,755 shares of Merck & Co., Inc. (BG:6MK) valued at $1,774,878 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 14,740 shares of Merck & Co., Inc.. This represents a change in shares of 0.10% 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)
2026-05-18 2026-03-31 13F MERCK COM 58933Y105 14,755 15 0.10 1,775 14.38 0.3052
2026-02-03 2025-12-31 13F MERCK COM 58933Y105 14,740 87 0.59 1,552 26.20 0.4621
2025-11-03 2025-09-30 13F MERCK COM 58933Y105 14,653 -386 -2.57 1,230 3.28 0.3752
2025-07-28 2025-06-30 13F MERCK COM 58933Y105 15,039 -689 -4.38 1,190 -15.66 0.3970
2025-05-08 2025-03-31 13F MERCK COM 58933Y105 15,728 -450 -2.78 1,412 -12.31 0.5036
2025-01-16 2024-12-31 13F MERCK COM 58933Y105 16,178 -183 -1.12 1,609 -13.35 0.5520
2024-11-07 2024-09-30 13F MERCK COM 58933Y105 16,361 244 1.51 1,858 -6.92 0.6339
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 16,117 -555 -3.33 1,995 -9.28 0.7236
2024-05-07 2024-03-31 13F MERCK COM 58933Y105 16,672 206 1.25 2,200 22.51 0.8020
2024-02-12 2023-12-31 13F MERCK COM 58933Y105 16,466 -342 -2.03 1,795 3.76 0.6931
2023-11-16 2023-09-30 13F MERCK COM 58933Y105 16,808 16 0.10 1,730 -10.69 0.7217
2023-08-01 2023-06-30 13F MERCK COM 58933Y105 16,792 654 4.05 1,938 12.88 0.7639
2023-04-25 2023-03-31 13F MERCK COM 58933Y105 16,138 781 5.09 1,717 0.76 0.7161
2023-02-23 2022-12-31 13F MERCK COM 58933Y105 15,357 2,200 16.72 1,704 50.31 0.7462
2022-10-28 2022-09-30 13F MERCK COM 58933Y105 13,157 6,970 112.66 1,133 100.89 0.5172
2022-07-21 2022-06-30 13F MERCK COM 58933Y105 6,187 473 8.28 564 20.26 0.2412
2022-04-19 2022-03-31 13F MERCK COM 58933Y105 5,714 -541 -8.65 469 -2.09 0.1703
2022-02-03 2021-12-31 13F MERCK COM 58933Y105 6,255 19 0.30 479 2.13 0.1612
2021-10-26 2021-09-30 13F MERCK COM 58933Y105 6,236 -825 -11.68 469 -14.57 0.1677
2021-07-29 2021-06-30 13F MERCK COM 58933Y105 7,061 -423 -5.65 549 -4.85 0.1781
2021-04-26 2021-03-31 13F MERCK & CO. COM 58933Y105 7,484 -5,329 -41.59 577 -44.94 0.1931
2021-02-05 2020-12-31 13F MERCK & CO. COM 58933Y105 12,813 -2,179 -14.53 1,048 -15.69 0.3569
2020-11-12 2020-09-30 13F MERCK & CO. COM 58933Y105 14,992 -6,042 -28.72 1,243 -23.60 0.4644
2020-08-11 2020-06-30 13F MERCK & CO. COM 58933Y105 21,034 -3,928 -15.74 1,627 -15.30 0.6474
2020-04-29 2020-03-31 13F MERCK & CO. COM 58933Y105 24,962 151 0.61 1,921 -14.85 0.8874
2020-01-29 2019-12-31 13F MERCK COM 58933Y105 24,811 1,222 5.18 2,256 13.60 0.8695
2019-10-25 2019-09-30 13F MERCK COM 58933Y105 23,589 480 2.08 1,986 2.48 0.8095
2019-08-01 2019-06-30 13F MERCK COM 58933Y105 23,109 2,423 11.71 1,938 12.67 0.8101
2019-04-17 2019-03-31 13F MERCK COM 58933Y105 20,686 1,602 8.39 1,720 17.89 0.7561
2019-02-06 2018-12-31 13F MERCK COM 58933Y105 19,084 3,296 20.88 1,459 30.27 0.7225
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 15,788 671 4.44 1,120 22.14 0.4979
2018-08-07 2018-06-30 13F MERCK COM 58933Y105 15,117 2,397 18.84 917 32.32 0.4229
2018-06-04 2018-03-31 13F MERCK COM 58933Y105 12,720 12,720 693 0.3200
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.