Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionGreenleaf Trust
Latest Disclosed Ownership78,684 shares
Latest Disclosed Value $ 9,464,898
Greenleaf Trust reports 1.71% increase in ownership of 6MK / Merck & Co., Inc.

On April 27, 2026 - Greenleaf Trust filed a 13F-HR form disclosing ownership of 78,684 shares of Merck & Co., Inc. (BG:6MK) valued at $9,464,898 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 77,358 shares of Merck & Co., Inc.. This represents a change in shares of 1.71% 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)
2026-04-27 2026-03-31 13F Merck Com 58933Y105 78,684 1,326 1.71 9,465 16.24 0.0521
2026-01-21 2025-12-31 13F Merck Com 58933Y105 77,358 416 0.54 8,143 26.10 0.0746
2025-10-22 2025-09-30 13F Merck Com 58933Y105 76,942 -324 -0.42 6,458 5.58 0.0587
2025-07-17 2025-06-30 13F Merck Com 58933Y105 77,266 -19,620 -20.25 6,116 -29.67 0.0541
2025-04-30 2025-03-31 13F Merck Com 58933Y105 96,886 -6,548 -6.33 8,696 -15.48 0.0793
2025-01-24 2024-12-31 13F Merck COM 58933Y105 103,434 1,973 1.94 10,290 -10.69 0.0937
2024-10-22 2024-09-30 13F Merck COM 58933Y105 101,461 -40 -0.04 11,522 -8.31 0.1025
2024-07-22 2024-06-30 13F Merck COM 58933Y105 101,501 -173 -0.17 12,566 -6.34 0.1192
2024-04-29 2024-03-31 13F Merck COM 58933Y105 101,674 13,614 15.46 13,416 39.74 0.1247
2024-01-31 2023-12-31 13F Merck COM 58933Y105 88,060 445 0.51 9,600 6.44 0.1029
2023-11-09 2023-09-30 13F Merck COM 58933Y105 87,615 1,187 1.37 9,020 -9.56 0.1040
2023-08-09 2023-06-30 13F Merck COM 58933Y105 86,428 -1,760 -2.00 9,973 6.29 0.1060
2023-05-11 2023-03-31 13F Merck COM 58933Y105 88,188 5,028 6.05 9,382 104,144.44 0.1060
2023-01-25 2022-12-31 13F Merck COM 58933Y105 83,160 4,599 5.85 9 -99.87 0.1168
2022-11-10 2022-09-30 13F Merck COM 58933Y105 78,561 4,283 5.77 6,766 -0.09 0.1001
2022-08-12 2022-06-30 13F Merck COM 58933Y105 74,278 17,542 30.92 6,772 45.48 0.1025
2022-04-27 2022-03-31 13F Merck COM 58933Y105 56,736 1,668 3.03 4,655 10.31 0.0556
2022-02-11 2021-12-31 13F Merck COM 58933Y105 55,068 -1,602 -2.83 4,220 -0.85 0.0495
2021-11-12 2021-09-30 13F Merck COM 58933Y105 56,670 -5,043 -8.17 4,256 -11.31 0.0519
2021-08-10 2021-06-30 13F Merck COM 58933Y105 61,713 3,447 5.92 4,799 6.83 0.0595
2021-04-30 2021-03-31 13F Merck COM 58933Y105 58,266 356 0.61 4,492 -5.17 0.0593
2021-02-08 2020-12-31 13F Merck COM 58933Y105 57,910 3,739 6.90 4,737 5.43 0.0629
2020-10-30 2020-09-30 13F Merck COM 58933Y105 54,171 3,018 5.90 4,493 13.57 0.0696
2020-08-12 2020-06-30 13F Merck COM 58933Y105 51,153 5,673 12.47 3,956 13.06 0.0694
2020-04-29 2020-03-31 13F Merck COM 58933Y105 45,480 -814 -1.76 3,499 -16.89 0.0696
2020-02-11 2019-12-31 13F Merck COM 58933Y105 46,294 915 2.02 4,210 10.21 0.0660
2019-11-08 2019-09-30 13F Merck COM 58933Y105 45,379 996 2.24 3,820 2.63 0.0593
2019-07-24 2019-06-30 13F Merck COM 58933Y105 44,383 1,371 3.19 3,722 4.05 0.0589
2019-05-08 2019-03-31 13F Merck COM 58933Y105 43,012 1,301 3.12 3,577 12.24 0.0590
2019-02-07 2018-12-31 13F Merck & Co Inc COM 58933Y105 41,711 2,094 5.29 3,187 13.42 0.0630
2018-10-29 2018-09-30 13F Merck & Co Inc COM 58933Y105 39,617 1,665 4.39 2,810 21.96 0.0508
2018-08-07 2018-06-30 13F Merck & Co Inc COM 58933Y105 37,952 6,136 19.29 2,304 32.95 0.0439
2018-04-30 2018-03-31 13F Merck & Co Inc COM 58933Y105 31,816 1,072 3.49 1,733 0.17 0.0344
2018-02-08 2017-12-31 13F Merck & Co Inc COM 58933Y105 30,744 -257 -0.83 1,730 -12.85 0.0351
2017-11-13 2017-09-30 13F Merck & Co Inc COM 58933Y105 31,001 11,445 58.52 1,985 58.42 0.0435
2017-07-24 2017-06-30 13F Merck & Co Inc COM 58933Y105 19,556 -128,896 -86.83 1,253 -86.72 0.0286
2017-04-28 2017-03-31 13F Merck & Co Inc COM 58933Y105 148,452 -33,243 -18.30 9,433 -11.81 0.2269
2017-01-24 2016-12-31 13F Merck & Co Inc COM 58933Y105 181,695 -8,627 -4.53 10,696 -9.95 0.2808
2016-10-19 2016-09-30 13F Merck & Co Inc COM 58933Y105 190,322 -2,053 -1.07 11,878 7.17 0.3126
2016-07-28 2016-06-30 13F Merck & Co Inc COM 58933Y105 192,375 -29,458 -13.28 11,083 -5.57 0.2839
2016-04-28 2016-03-31 13F Merck & Co Inc COM 58933Y105 221,833 10,686 5.06 11,737 5.24 0.3192
2016-02-05 2015-12-31 13F Merck & Co Inc COM 58933Y105 211,147 191,697 985.59 11,153 1,060.56 0.3366
2015-10-30 2015-09-30 13F Merck & Co Inc COM 58933Y105 19,450 -276 -1.40 961 -14.43 0.0287
2015-08-12 2015-06-30 13F Merck & Co Inc COM 58933Y105 19,726 115 0.59 1,123 -0.35 0.0324
2015-04-20 2015-03-31 13F Merck & Co Inc COM 58933Y105 19,611 19,611 0.00 1,127 0.0339
2015-02-02 2014-12-31 13F Merck & Co Inc COM 58933Y105 0 -18,958 -100.00 0 -100.00
2014-10-20 2014-09-30 13F Merck & Co Inc COM 58933Y105 18,958 67 0.35 1,124 2.84 0.0371
2014-08-12 2014-06-30 13F Merck & Co Inc COM 58933Y105 18,891 908 5.05 1,093 7.05 0.0347
2014-05-13 2014-03-31 13F Merck & Co Inc COM 58933Y105 17,983 1,565 9.53 1,021 24.21 0.0328
2014-02-12 2013-12-31 13F Merck & Co Inc COM 58933Y105 16,418 370 2.31 822 7.59 0.0282
2013-10-30 2013-09-30 13F Merck & Co Inc COM 58933Y105 16,048 1,706 11.90 764 14.71 0.0287
2013-07-17 2013-06-30 13F Merck & Co Inc COM 58933Y105 14,342 14,342 666 0.0261
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.