Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionChatham Capital Group, Inc.
Latest Disclosed Ownership45,959 shares
Latest Disclosed Value $ 5,528,423
Chatham Capital Group, Inc. reports 0.40% decrease in ownership of 6MK / Merck & Co., Inc.

On April 20, 2026 - Chatham Capital Group, Inc. filed a 13F-HR form disclosing ownership of 45,959 shares of Merck & Co., Inc. (BG:6MK) valued at $5,528,423 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 46,143 shares of Merck & Co., Inc.. This represents a change in shares of -0.40% 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)
2026-04-20 2026-03-31 13F MERCK COM 58933Y105 45,959 -184 -0.40 5,528 13.84 0.8020
2026-01-14 2025-12-31 13F MERCK COM 58933Y105 46,143 125 0.27 4,857 25.74 0.6911
2025-10-15 2025-09-30 13F MERCK COM 58933Y105 46,018 -599 -1.28 3,862 4.66 0.5555
2025-07-17 2025-06-30 13F MERCK COM 58933Y105 46,617 13,730 41.75 3,690 25.04 0.5629
2025-04-10 2025-03-31 13F MERCK COM 58933Y105 32,887 319 0.98 2,952 -8.89 0.4925
2025-02-07 2024-12-31 13F MERCK COM 58933Y105 32,568 612 1.92 3,240 -10.72 0.5328
2024-10-16 2024-09-30 13F MERCK COM 58933Y105 31,956 -11,771 -26.92 3,629 -32.98 0.5932
2024-07-15 2024-06-30 13F MERCK COM 58933Y105 43,727 -525 -1.19 5,413 -7.30 0.9450
2024-04-18 2024-03-31 13F MERCK COM 58933Y105 44,252 -224 -0.50 5,839 20.44 1.0716
2024-01-19 2023-12-31 13F MERCK COM 58933Y105 44,476 135 0.30 4,849 6.22 0.9818
2023-10-26 2023-09-30 13F MERCK COM 58933Y105 44,341 2,136 5.06 4,565 -6.28 1.0189
2023-07-14 2023-06-30 13F MERCK COM 58933Y105 42,205 185 0.44 4,870 8.95 1.0249
2023-04-24 2023-03-31 13F MERCK COM 58933Y105 42,020 110 0.26 4,471 -3.85 0.9992
2023-02-01 2022-12-31 13F MERCK COM 58933Y105 41,910 -133 -0.32 4,650 28.39 1.0903
2022-10-28 2022-09-30 13F MERCK COM 58933Y105 42,043 764 1.85 3,621 -3.77 0.8879
2022-08-02 2022-06-30 13F MERCK COM 58933Y105 41,279 436 1.07 3,763 12.29 0.8514
2022-04-21 2022-03-31 13F MERCK & CO. COM 58933Y105 40,843 110 0.27 3,351 7.34 0.6480
2022-02-02 2021-12-31 13F MERCK COM 58933Y105 40,733 -1,825 -4.29 3,122 -2.35 0.5636
2021-10-13 2021-09-30 13F MERCK COM 58933Y105 42,558 -883 -2.03 3,197 -5.36 0.6153
2021-07-28 2021-06-30 13F MERCK COM 58933Y105 43,441 664 1.55 3,378 2.43 0.6531
2021-04-29 2021-03-31 13F MERCK & CO. COM 58933Y105 42,777 415 0.98 3,298 -4.82 0.6903
2021-01-27 2020-12-31 13F MERCK & CO. COM 58933Y105 42,362 -1,320 -3.02 3,465 -4.36 0.7788
2020-10-22 2020-09-30 13F MERCK & CO. COM 58933Y105 43,682 -3,625 -7.66 3,623 -0.96 0.8933
2020-07-20 2020-06-30 13F MERCK & CO. COM 58933Y105 47,307 -144 -0.30 3,658 0.19 0.9468
2020-05-01 2020-03-31 13F MERCK & CO. COM 58933Y105 47,451 1,379 2.99 3,651 -12.86 1.0776
2020-01-31 2019-12-31 13F MERCK COM 58933Y105 46,072 120 0.26 4,190 8.32 1.0329
2019-11-08 2019-09-30 13F MERCK COM 58933Y105 45,952 40 0.09 3,868 0.47 0.9882
2019-07-24 2019-06-30 13F MERCK COM 58933Y105 45,912 45,912 3,850 0.9694
2016-02-02 2015-12-31 13F MERCK & CO INC COM 58933Y105 0 0 0 0.0000
2015-10-23 2015-09-30 13F MERCK & CO INC COM 58933Y105 0 -5,406 -100.00 0 -100.00
2015-07-31 2015-06-30 13F MERCK & CO INC COM 58933Y105 5,406 -1,386 -20.41 308 -21.03 0.0867
2015-04-28 2015-03-31 13F MERCK & CO INC COM 58933Y105 6,792 500 7.95 390 9.24 0.1143
2015-02-05 2014-12-31 13F MERCK & CO INC COM 58933Y105 6,292 0 0.00 357 -4.29 0.1065
2014-11-06 2014-09-30 13F MERCK & CO INC COM 58933Y105 6,292 6,292 373 0.1159
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.