Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionGilbert & Cook, Inc.
Latest Disclosed Ownership9,084 shares
Latest Disclosed Value $ 1,092,714
Gilbert & Cook, Inc. reports 0.27% decrease in ownership of 6MK / Merck & Co., Inc.

On May 5, 2026 - Gilbert & Cook, Inc. filed a 13F-HR form disclosing ownership of 9,084 shares of Merck & Co., Inc. (BG:6MK) valued at $1,092,714 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 7, 2026 disclosing 9,109 shares of Merck & Co., Inc.. This represents a change in shares of -0.27% 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)
2026-05-05 2026-03-31 13F MERCK COM 58933Y105 9,084 -25 -0.27 1,093 13.99 0.1411
2026-01-07 2025-12-31 13F MERCK COM 58933Y105 9,109 407 4.68 959 31.23 0.1205
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 8,702 95 1.10 730 7.20 0.0938
2025-08-05 2025-06-30 13F MERCK COM 58933Y105 8,607 263 3.15 681 -8.96 0.0921
2025-05-06 2025-03-31 13F MERCK COM 58933Y105 8,344 -1,219 -12.75 749 -21.35 0.1086
2025-01-23 2024-12-31 13F MERCK COM 58933Y105 9,563 -155 -1.59 951 -13.78 0.1341
2024-11-07 2024-09-30 13F MERCK COM 58933Y105 9,718 -54 -0.55 1,104 -8.77 0.1517
2024-08-01 2024-06-30 13F MERCK COM 58933Y105 9,772 -751 -7.14 1,210 -12.90 0.1768
2024-05-02 2024-03-31 13F MERCK COM 58933Y105 10,523 107 1.03 1,389 22.29 0.1892
2024-02-13 2023-12-31 13F/A-1 MERCK COM 58933Y105 10,416 -1,774 -14.55 1,136 -9.49 0.1607
2024-02-05 2023-12-31 13F MERCK COM 58933Y105 10,416 -1,774 1,136 0.1607
2023-11-02 2023-09-30 13F MERCK COM 58933Y105 12,190 -1,973 -13.93 1,255 -23.26 0.1979
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 14,163 600 4.42 1,634 13.31 0.2620
2023-05-05 2023-03-31 13F MERCK COM 58933Y105 13,563 119 0.89 1,443 -3.29 0.2490
2023-02-09 2022-12-31 13F MERCK COM 58933Y105 13,444 -235 -1.72 1,492 9.63 0.2714
2022-11-03 2022-09-30 13F MERCK COM 58933Y105 13,679 307 2.30 1,360 11.57 0.3024
2022-08-05 2022-06-30 13F MERCK COM 58933Y105 13,372 640 5.03 1,219 16.65 0.2191
2022-05-02 2022-03-31 13F MERCK COM 58933Y105 12,732 546 4.48 1,045 11.88 0.1691
2022-01-19 2021-12-31 13F MERCK COM 58933Y105 12,186 4,269 53.92 934 56.97 0.1503
2022-01-20 2021-09-30 13F/A-1 MERCK COM 58933Y105 7,917 679 9.38 595 5.68 0.1065
2021-10-13 2021-09-30 13F MERCK COM 58933Y105 5,990 -1,248 595 0.1065
2021-07-13 2021-06-30 13F MERCK COM 58933Y105 7,238 168 2.38 563 3.30 0.1013
2021-04-14 2021-03-31 13F MERCK & CO. COM 58933Y105 7,070 525 8.02 545 1.49 0.1072
2021-02-11 2020-12-31 13F MERCK & CO. COM 58933Y105 6,545 891 15.76 537 14.50 0.1158
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 5,654 -5,427 -48.98 469 -45.27 0.1112
2020-08-05 2020-06-30 13F MERCK & CO. COM 58933Y105 11,081 848 8.29 857 8.89 0.2148
2020-05-05 2020-03-31 13F MERCK & CO. COM 58933Y105 10,233 684 7.16 787 -9.33 0.2313
2020-02-03 2019-12-31 13F MERCK COM 58933Y105 9,549 915 10.60 868 19.39 0.2127
2019-11-05 2019-09-30 13F MERCK COM 58933Y105 8,634 2,875 49.92 727 50.52 0.2037
2019-08-05 2019-06-30 13F MERCK COM 58933Y105 5,759 -623 -9.76 483 -8.87 0.1412
2019-05-10 2019-03-31 13F MERCK COM 58933Y105 6,382 -163 -2.49 530 6.00 0.1611
2019-02-12 2018-12-31 13F MERCK COM 58933Y105 6,545 901 15.96 500 25.00 0.1766
2018-11-07 2018-09-30 13F MERCK COM 58933Y105 5,644 19 0.34 400 17.30 0.1241
2018-07-17 2018-06-30 13F MERCK COM 58933Y105 5,625 437 8.42 341 20.49 0.1150
2018-04-30 2018-03-31 13F MERCK COM 58933Y105 5,188 -150 -2.81 283 -5.67 0.0991
2018-02-01 2017-12-31 13F MERCK COM 58933Y105 5,338 -29 -0.54 300 -12.79 0.1045
2017-10-31 2017-09-30 13F MERCK COM 58933Y105 5,367 -4,849 -47.46 344 -47.48 0.1257
2017-07-20 2017-06-30 13F MERCK COM 58933Y105 10,216 4,745 86.73 655 88.22 0.2315
2017-05-22 2017-03-31 13F MERCK COM 58933Y105 5,471 408 8.06 348 16.78 0.1433
2017-05-22 2016-12-31 13F MERCK COM 58933Y105 5,063 5,063 298 0.1317
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.