Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionAtlantic Trust, LLC
Latest Disclosed Ownership19,453 shares
Latest Disclosed Value $ 2,340,002
Atlantic Trust, LLC reports 1.14% increase in ownership of 6MK / Merck & Co., Inc.

On May 6, 2026 - Atlantic Trust, LLC filed a 13F-HR form disclosing ownership of 19,453 shares of Merck & Co., Inc. (BG:6MK) valued at $2,340,002 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 19,233 shares of Merck & Co., Inc.. This represents a change in shares of 1.14% 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)
2026-05-06 2026-03-31 13F MERCK COM 58933Y105 19,453 220 1.14 2,340 15.61 0.3815
2026-02-09 2025-12-31 13F MERCK COM 58933Y105 19,233 -249 -1.28 2,024 23.79 0.3187
2025-11-10 2025-09-30 13F MERCK COM 58933Y105 19,482 -2,237 -10.30 1,635 -4.89 0.2794
2025-08-08 2025-06-30 13F MERCK COM 58933Y105 21,719 -1,694 -7.24 1,719 -18.18 0.3253
2025-05-09 2025-03-31 13F Merck Com 58933Y105 23,413 -4,204 -15.22 2,102 -23.52 0.4677
2025-02-10 2024-12-31 13F MERCK COM 58933Y105 27,617 94 0.34 2,747 -12.10 0.5938
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 27,523 -724 -2.56 3,125 -10.64 0.7482
2024-08-09 2024-06-30 13F MERCK COM 58933Y105 28,247 -736 -2.54 3,497 -8.55 0.8696
2024-05-10 2024-03-31 13F MERCK COM 58933Y105 28,983 -2,496 -7.93 3,824 11.45 1.0001
2024-02-06 2023-12-31 13F MERCK COM 58933Y105 31,479 -1,160 -3.55 3,432 2.11 0.9384
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 32,639 515 1.60 3,360 -8.84 1.1052
2023-08-08 2023-06-30 13F Merck Com 58933Y105 32,124 1,662 5.46 3,687 13.77 1.1839
2023-05-10 2023-03-31 13F Merck COM 58933Y105 30,462 -1,436 -4.50 3,241 107,900.00 1.0340
2023-02-01 2022-12-31 13F MERCK COM 58933Y105 31,898 399 1.27 4 -99.89 1.1798
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 31,499 29,287 1,324.01 2,712 1,242.57 0.9438
2022-08-11 2022-06-30 13F Merck COM 58933Y105 2,212 0 0.00 202 11.60 0.1536
2022-05-16 2022-03-31 13F Merck COM 58933Y105 2,212 -152 -6.43 181 0.00 0.1174
2022-02-09 2021-12-31 13F Merck Com 58933Y105 2,364 0 0.00 181 1.69 0.1068
2021-11-02 2021-09-30 13F Merck Com 58933Y105 2,364 1,202 103.44 178 97.78 0.1127
2021-08-12 2021-06-30 13F Merck Com 58933Y105 1,162 1,162 90 0.0587
2021-04-30 2021-03-31 13F Merck Com 58933Y105 0 -1,200 -100.00 0 -100.00
2021-02-16 2020-12-31 13F Merck Com 58933Y105 1,200 0 0.00 98 -2.00 0.0583
2020-10-23 2020-09-30 13F Merck Com 58933Y105 1,200 38 3.27 100 11.11 0.0794
2020-08-17 2020-06-30 13F Merck Com 58933Y105 1,162 0 0.00 90 1.12 0.0758
2020-05-12 2020-03-31 13F Merck Com 58933Y105 1,162 -33 -2.76 89 -18.35 0.0805
2020-02-03 2019-12-31 13F Merck Com 58933Y105 1,195 1 0.08 109 7.92 0.0799
2019-11-07 2019-09-30 13F Merck Com 58933Y105 1,194 0 0.00 101 1.00 0.0787
2019-07-31 2019-06-30 13F Merck Com 58933Y105 1,194 32 2.75 100 3.09 0.0798
2019-05-13 2019-03-31 13F Merck Com 58933Y105 1,162 -413 -26.22 97 -19.17 0.0810
2019-02-13 2018-12-31 13F/A-1 Merck Com 58933Y105 1,575 -646 -29.09 120 -24.05 0.1116
2019-02-13 2018-12-31 13F Merck Com 58933Y105 1,575 120
2018-11-15 2018-09-30 13F Merck COM 58933Y105 2,221 135 6.47 158 24.41 0.1212
2018-08-20 2018-06-30 13F Merck Com 58933Y105 2,086 2,086 -6.08 127 -19.62 0.1134
2018-05-15 2018-03-31 13F Merck Com 58933Y105 0 -4,405 -100.00 0 -100.00
2018-02-14 2017-12-31 13F Merck Com 58933Y105 4,405 0 0.00 248 -12.06 0.1695
2017-11-17 2017-09-30 13F Merck Com 58933Y105 4,405 0 0.00 282 0.00 0.2098
2017-08-21 2017-06-30 13F Merck Com 58933Y105 4,405 -225 -4.86 282 -4.08 0.2226
2017-06-19 2017-03-31 13F Merck COM 58933Y105 4,630 461 11.06 294 20.00 0.2434
2017-06-14 2016-12-31 13F Merck COM 58933Y105 4,169 4,169 245 0.2201
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.