머크 앤 컴퍼니(Merck & Co., Inc.)
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionChicago Capital, LLC
Latest Disclosed Ownership27,056 shares
Latest Disclosed Value $ 3,254,623
Chicago Capital, LLC reports 0.02% increase in ownership of MRK / Merck & Co., Inc.

On April 23, 2026 - Chicago Capital, LLC filed a 13F-HR form disclosing ownership of 27,056 shares of Merck & Co., Inc. (MX:MRK) valued at $3,254,623 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 27,050 shares of Merck & Co., Inc.. This represents a change in shares of 0.02% 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)
2026-04-23 2026-03-31 13F MERCK COM 58933Y105 27,056 6 0.02 3,255 14.30 0.0878
2026-01-26 2025-12-31 13F MERCK COM 58933Y105 27,050 1,341 5.22 2,847 31.99 0.0703
2025-10-22 2025-09-30 13F MERCK COM 58933Y105 25,709 423 1.67 2,158 7.80 0.0531
2025-07-17 2025-06-30 13F MERCK COM 58933Y105 25,286 -75 -0.30 2,002 -12.08 0.0494
2025-04-17 2025-03-31 13F MERCK COM 58933Y105 25,361 53 0.21 2,276 -9.57 0.0643
2025-01-24 2024-12-31 13F MERCK COM 58933Y105 25,308 161 0.64 2,518 -11.84 0.0668
2024-10-18 2024-09-30 13F MERCK COM 58933Y105 25,147 0 0.00 2,856 -8.29 0.0793
2024-08-06 2024-06-30 13F MERCK COM 58933Y105 25,147 2,960 13.34 3,113 6.35 0.0926
2024-04-15 2024-03-31 13F MERCK COM 58933Y105 22,187 665 3.09 2,928 24.77 0.0892
2024-01-22 2023-12-31 13F MERCK COM 58933Y105 21,522 -360 -1.65 2,346 4.17 0.0845
2023-10-25 2023-09-30 13F MERCK COM 58933Y105 21,882 275 1.27 2,253 -9.67 0.1054
2023-07-20 2023-06-30 13F MERCK COM 58933Y105 21,607 285 1.34 2,493 9.92 0.1124
2023-04-18 2023-03-31 13F MERCK COM 58933Y105 21,322 15 0.07 2,268 -4.06 0.1129
2023-01-20 2022-12-31 13F MERCK COM 58933Y105 21,307 100 0.47 2,364 29.46 0.1308
2022-10-14 2022-09-30 13F MERCK COM 58933Y105 21,207 70 0.33 1,826 -5.24 0.1056
2022-07-21 2022-06-30 13F MERCK COM 58933Y105 21,137 0 0.00 1,927 11.13 0.1065
2022-04-21 2022-03-31 13F MERCK COM 58933Y105 21,137 300 1.44 1,734 8.58 0.0746
2022-01-20 2021-12-31 13F MERCK COM 58933Y105 20,837 210 1.02 1,597 3.10 0.0595
2021-10-28 2021-09-30 13F MERCK COM 58933Y105 20,627 1,951 10.45 1,549 6.68 0.0588
2021-07-22 2021-06-30 13F MERCK & CO. COM 58933Y105 18,676 -180 -0.95 1,452 -0.14 0.0567
2021-04-13 2021-03-31 13F MERCK & CO. COM 58933Y105 18,856 811 4.49 1,454 -1.49 0.0614
2021-01-25 2020-12-31 13F MERCK & CO. COM 58933Y105 18,045 0 0.00 1,476 -1.40 0.0659
2020-10-13 2020-09-30 13F MERCK & CO. COM 58933Y105 18,045 115 0.64 1,497 7.93 0.0770
2020-07-29 2020-06-30 13F MERCK & CO. COM 58933Y105 17,930 0 0.00 1,387 0.51 0.0804
2020-04-21 2020-03-31 13F MERCK & CO. COM 58933Y105 17,930 -290 -1.59 1,380 -16.72 0.1113
2020-01-14 2019-12-31 13F MERCK COM 58933Y105 18,220 150 0.83 1,657 8.94 0.1011
2019-10-28 2019-09-30 13F MERCK COMMON 58933Y105 18,070 0 0.00 1,521 0.40 0.1019
2019-07-11 2019-06-30 13F MERCK COMMON 58933Y105 18,070 0 0.00 1,515 0.80 0.0969
2019-04-23 2019-03-31 13F MERCK COMMON 58933Y105 18,070 -441 -2.38 1,503 6.29 0.1022
2019-02-11 2018-12-31 13F MERCK COM 58933Y105 18,511 0 0.00 1,414 7.69 0.1153
2018-11-02 2018-09-30 13F MERCK COM 58933Y105 18,511 935 5.32 1,313 23.06 0.0908
2018-07-19 2018-06-30 13F MERCK COM 58933Y105 17,576 2,312 15.15 1,067 28.40 0.0860
2018-05-09 2018-03-31 13F Merck COM 58933Y105 15,264 15,264 831 0.1109
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.