Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionS&co Inc
Latest Disclosed Ownership425,528 shares
Latest Disclosed Value $ 51,186
S&co Inc reports 0.00% decrease in ownership of 6MK / Merck & Co., Inc.

On May 7, 2026 - S&co Inc filed a 13F-HR form disclosing ownership of 425,528 shares of Merck & Co., Inc. (BG:6MK) valued at $51,186 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 425,531 shares of Merck & Co., Inc.. This represents a change in shares of -0.00% 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)
2026-05-07 2026-03-31 13F MERCK COM 58933Y105 425,528 -3 -0.00 51 15.91 3.1756
2026-02-05 2025-12-31 13F MERCK COM 58933Y105 425,531 3,000 0.71 45 25.71 2.7822
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 422,531 -3,340 -0.78 35 6.06 2.1709
2025-08-07 2025-06-30 13F MERCK COM 58933Y105 425,871 -712 -0.17 34 -13.16 2.1616
2025-05-08 2025-03-31 13F MERCK COM 58933Y105 426,583 23,216 5.76 38 -5.00 2.5698
2025-02-07 2024-12-31 13F MERCK COM 58933Y105 403,367 55 0.01 40 -11.11 2.7229
2024-11-07 2024-09-30 13F MERCK COM 58933Y105 403,312 4,200 1.05 46 -8.16 2.9925
2024-08-08 2024-06-30 13F MERCK COM 58933Y105 399,112 -420 -0.11 49 -5.77 3.4463
2024-05-09 2024-03-31 13F MERCK COM 58933Y105 399,532 0 0.00 53 20.93 3.7126
2024-02-12 2023-12-31 13F MERCK COM 58933Y105 399,532 2,645 0.67 44 7.50 3.3396
2023-11-09 2023-09-30 13F MERCK COM 58933Y105 396,887 -335 -0.08 41 -11.11 3.3554
2023-08-08 2023-06-30 13F MERCK COM 58933Y105 397,222 -1,405 -0.35 46 7.14 3.6930
2023-05-09 2023-03-31 13F MERCK COM 58933Y105 398,627 0 0.00 42 -4.55 3.6012
2023-02-07 2022-12-31 13F MERCK COM 58933Y105 398,627 -325 -0.08 44 -99.87 3.8727
2022-11-09 2022-09-30 13F MERCK COM 58933Y105 398,952 -385 -0.10 34,357 -5.63 3.0937
2022-08-09 2022-06-30 13F MERCK COM 58933Y105 399,337 -6,271 -1.55 36,407 9.40 3.0608
2022-05-05 2022-03-31 13F MERCK COM 58933Y105 405,608 9,635 2.43 33,280 9.66 2.3362
2022-02-08 2021-12-31 13F MERCK COM 58933Y105 395,973 1,180 0.30 30,347 2.34 2.1434
2021-11-09 2021-09-30 13F MERCK COM 58933Y105 394,793 365 0.09 29,652 -3.33 2.3117
2021-07-14 2021-06-30 13F MERCK COM 58933Y105 394,428 507 0.13 30,674 1.01 2.3955
2021-04-23 2021-03-31 13F MERCK COM 58933Y105 393,921 2,225 0.57 30,367 -5.22 2.5552
2021-01-28 2020-12-31 13F MERCK COM 58933Y105 391,696 6,454 1.68 32,041 0.27 2.8612
2020-12-11 2020-09-30 13F MERCK COM 58933Y105 385,242 -440 -0.11 31,956 7.15 3.1862
2020-12-16 2020-06-30 13F MERCK COM 58933Y105 385,682 -30 -0.01 29,825 0.50 3.2770
2020-04-28 2020-03-31 13F MERCK COM 58933Y105 385,712 -1,512 -0.39 29,677 -15.73 3.9645
2020-01-24 2019-12-31 13F MERCK COM 58933Y105 387,224 -50 -0.01 35,218 8.03 3.6744
2019-10-29 2019-09-30 13F MERCK COM 58933Y105 387,274 2,327 0.60 32,601 1.00 3.6101
2019-07-23 2019-06-30 13F MERCK COM 58933Y105 384,947 160 0.04 32,278 0.86 3.5422
2019-04-24 2019-03-31 13F MERCK COM 58933Y105 384,787 -386 -0.10 32,003 8.74 3.5626
2019-01-29 2018-12-31 13F MERCK COM 58933Y105 385,173 -1,836 -0.47 29,431 7.20 3.7318
2018-11-05 2018-09-30 13F MERCK COM 58933Y105 387,009 -66 -0.02 27,454 16.85 3.0734
2018-07-27 2018-06-30 13F MERCK COM 58933Y105 387,075 280 0.07 23,495 11.51 2.8262
2018-05-02 2018-03-31 13F MERCK COM 58933Y105 386,795 -1,370 -0.35 21,069 -3.54 2.6503
2018-01-22 2017-12-31 13F MERCK & CO INC COM 58933Y105 388,165 0 0.00 21,842 -12.12 2.7091
2017-11-02 2017-09-30 13F MERCK & CO INC COM 58933Y105 388,165 0 0.00 24,854 -0.09 3.1752
2017-07-28 2017-06-30 13F MERCK & CO INC COM 58933Y105 388,165 -558 -0.14 24,877 0.72 3.2891
2017-04-07 2017-03-31 13F MERCK & CO INC COM 58933Y105 388,723 4,054 1.05 24,699 9.07 3.3612
2017-01-27 2016-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 384,669 -1,000 -0.26 22,645 -5.92 3.2761
2017-01-25 2016-12-31 13F MERCK & CO INC COM 58933Y105 368,594 21,699
2016-10-28 2016-09-30 13F MERCK & CO INC COM 58933Y105 385,669 -645 -0.17 24,070 8.15 3.6134
2016-07-21 2016-06-30 13F MERCK & CO INC COM 58933Y105 386,314 0 0.00 22,256 8.88 3.4436
2016-04-29 2016-03-31 13F MERCK & CO INC COM 58933Y105 386,314 2,084 0.54 20,440 0.71 3.3129
2016-01-27 2015-12-31 13F MERCK & CO INC COM 58933Y105 384,230 -2,040 -0.53 20,295 6.38 3.4093
2015-10-28 2015-09-30 13F MERCK & CO INC COM 58933Y105 386,270 330 0.09 19,078 -13.17 3.2873
2015-07-13 2015-06-30 13F MERCK & CO INC COM 58933Y105 385,940 -2,200 -0.57 21,972 -1.52 3.2139
2015-04-27 2015-03-31 13F MERCK & CO INC COM 58933Y105 388,140 1,339 0.35 22,310 1.57 3.1711
2015-01-20 2014-12-31 13F MERCK & CO INC COM 58933Y105 386,801 5,641 1.48 21,966 -2.78 3.1842
2014-10-31 2014-09-30 13F MERCK & CO INC COM 58933Y105 381,160 -9,869 -2.52 22,595 -0.11 3.4572
2014-07-24 2014-06-30 13F MERCK & CO INC COM 58933Y105 391,029 -5,106 -1.29 22,621 0.59 3.1402
2014-04-28 2014-03-31 13F MERCK & CO INC COM 58933Y105 396,135 -200 -0.05 22,489 13.37 3.3616
2014-02-07 2013-12-31 13F MERCK & CO INC COM 58933Y105 396,335 -1,082 -0.27 19,837 4.84 3.3140
2013-10-22 2013-09-30 13F MERCK & CO INC COM 58933Y105 397,417 -3,812 -0.95 18,921 1.52 3.3211
2013-07-24 2013-06-30 13F MERCK & CO INC COM 58933Y105 401,229 401,229 18,637 2.8303
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.