Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership88,834 shares
Latest Disclosed Value $ 10,685,811
Quadrant Capital Group Llc reports 1.36% increase in ownership of 6MK / Merck & Co., Inc.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 88,834 shares of Merck & Co., Inc. (BG:6MK) valued at $10,685,811 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 87,645 shares of Merck & Co., Inc.. This represents a change in shares of 1.36% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-13 2026-03-31 13F/A-1 MERCK COM 58933Y105 88,834 1,189 1.36 10,686 15.83 0.3195
2026-05-11 2026-03-31 13F MERCK COM 58933Y105 88,834 1,189 49 0.0369
2026-02-12 2025-12-31 13F MERCK COM 58933Y105 87,645 991 1.14 9,226 26.84 0.2787
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 86,654 18,764 27.64 7,273 35.34 0.2364
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 67,890 23,433 52.71 5,375 34.69 0.1934
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 44,457 14,047 46.19 3,991 31.90 0.1482
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 30,410 -4,519 -12.94 3,026 -23.73 0.2083
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 34,929 -1,071 -2.98 3,967 -11.02 0.2756
2024-08-12 2024-06-30 13F MERCK COM 58933Y105 36,000 3,376 10.35 4,457 3.53 0.3310
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 32,624 -302 -0.92 4,305 19.92 0.3400
2024-02-08 2023-12-31 13F MERCK COM 58933Y105 32,926 -427 -1.28 3,590 4.54 0.3084
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 33,353 2,227 7.15 3,434 -4.40 0.3438
2023-08-10 2023-06-30 13F MERCK COM 58933Y105 31,126 -384 -1.22 3,592 7.16 0.3564
2023-05-11 2023-03-31 13F MERCK COM 58933Y105 31,510 535 1.73 3,353 -2.47 0.3491
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 30,975 3,313 11.98 3,437 44.23 0.3896
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 27,662 3,144 12.82 2,383 6.57 0.3151
2022-08-09 2022-06-30 13F MERCK COM 58933Y105 24,518 -219 -0.89 2,236 10.15 0.3004
2022-05-06 2022-03-31 13F MERCK COM 58933Y105 24,737 1,347 5.76 2,030 13.22 0.2458
2022-02-01 2021-12-31 13F MERCK COM 58933Y105 23,390 442 1.93 1,793 4.00 0.2139
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 22,948 3,046 15.30 1,724 11.37 0.2405
2021-08-09 2021-06-30 13F MERCK COM 58933Y105 19,902 1,542 8.40 1,548 9.40 0.2245
2021-05-12 2021-03-31 13F MERCK & CO. COM 58933Y105 18,360 1,965 11.99 1,415 5.52 0.2296
2021-02-16 2020-12-31 13F MERCK & CO. COM 58933Y105 16,395 -292 -1.75 1,341 -3.11 0.2490
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 16,687 -844 -4.81 1,384 2.06 0.3016
2020-08-13 2020-06-30 13F MERCK & CO. COM 58933Y105 17,531 -8,755 -33.31 1,356 -32.87 0.3001
2020-05-15 2020-03-31 13F Merck Com 58933Y105 26,286 -1,752 -6.25 2,020 -19.75 0.3381
2020-03-19 2019-12-31 13F/A-1 Merck Com 58933Y105 28,038 5,982 27.12 2,517 36.87 0.3035
2020-02-03 2019-12-31 13F Merck Com 58933Y105 28,038 5,982 2,517 8,505.2714
2019-10-24 2019-09-30 13F Merck COM 58933Y105 22,056 70 0.32 1,839 1.10 0.2829
2019-07-24 2019-06-30 13F Merck COM 58933Y105 21,986 -3,193 -12.68 1,819 -12.34 0.2878
2019-04-29 2019-03-31 13F Merck COM 58933Y105 25,179 5,354 27.01 2,075 39.17 0.3646
2019-01-17 2018-12-31 13F MERCK COM 58933Y105 19,825 -882 -4.26 1,491 2.97 0.3974
2018-10-29 2018-09-30 13F MERCK COM 58933Y105 20,707 129 0.63 1,448 17.92 0.4138
2018-08-08 2018-06-30 13F MERCK COM 58933Y105 20,578 933 4.75 1,228 16.84 0.4305
2018-05-10 2018-03-31 13F MERCK COM 58933Y105 19,645 -815 -3.98 1,051 -7.40 0.3811
2018-01-31 2017-12-31 13F MERCK COM 58933Y105 20,460 -338 -1.63 1,135 -13.36 0.4525
2017-10-13 2017-09-30 13F Merck & Co COM 58933Y105 20,798 -22 -0.11 1,310 2.10 0.5405
2017-08-14 2017-06-30 13F Merck & Co COM 58933Y105 20,820 -452 -2.12 1,283 -4.11 0.5672
2017-04-10 2017-03-31 13F Merck & Co COM 58933Y105 21,272 469 2.25 1,338 10.40 0.5880
2017-01-11 2016-12-31 13F Merck & Co COM 58933Y105 20,803 4,535 27.88 1,212 21.08 0.6079
2016-10-25 2016-09-30 13F Merck & Co COM 58933Y105 16,268 324 2.03 1,001 10.36 0.6530
2016-07-28 2016-06-30 13F Merck & Co COM 58933Y105 15,944 708 4.65 907 13.94 0.6239
2016-04-27 2016-03-31 13F Merck & Co COM 58933Y105 15,236 -17 -0.11 796 -0.13 0.5158
2016-01-28 2015-12-31 13F Merck & Co COM 58933Y105 15,253 956 6.69 797 13.86 0.5516
2015-10-28 2015-09-30 13F Merck & Co COM 58933Y105 14,297 -125 -0.87 700 -14.11 0.4830
2015-08-12 2015-06-30 13F Merck & Co COM 58933Y105 14,422 14,422 815 0.5186
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.