Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionWellington Shields & Co., LLC
Latest Disclosed Ownership23,266 shares
Latest Disclosed Value $ 2,798,667
Wellington Shields & Co., LLC reports 0.43% decrease in ownership of MRK / Merck & Co., Inc.

On May 4, 2026 - Wellington Shields & Co., LLC filed a 13F-HR form disclosing ownership of 23,266 shares of Merck & Co., Inc. (MX:MRK) valued at $2,798,667 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 23,366 shares of Merck & Co., Inc.. This represents a change in shares of -0.43% 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)
2026-05-04 2026-03-31 13F MERCK & CO INC COM Stock 58933Y105 23,266 -100 -0.43 2,799 13.79 0.7132
2026-02-09 2025-12-31 13F MERCK & CO INC COM Stock 58933Y105 23,366 -925 -3.81 2,460 20.66 0.6067
2025-11-05 2025-09-30 13F MERCK & CO INC COM Stock 58933Y105 24,291 -5,606 -18.75 2,039 -13.86 0.5317
2025-08-05 2025-06-30 13F MERCK & CO INC COM Stock 58933Y105 29,897 3,756 14.37 2,367 0.85 0.6699
2025-05-08 2025-03-31 13F MERCK & CO INC COM Stock 58933Y105 26,141 -75 -0.29 2,346 -10.01 0.7344
2025-02-10 2024-12-31 13F MERCK & CO INC COM Stock 58933Y105 26,216 -200 -0.76 2,608 -13.07 0.7997
2024-11-13 2024-09-30 13F MERCK & CO INC COM Stock 58933Y105 26,416 -100 -0.38 3,000 -8.62 0.9119
2024-08-07 2024-06-30 13F MERCK & CO INC COM Stock 58933Y105 26,516 350 1.34 3,283 -4.92 1.0692
2024-05-23 2024-03-31 13F/A-2 MERCK & CO INC COM Stock 58933Y105 26,166 0 0.00 3,453 21.04 1.1572
2024-05-23 2024-03-31 13F/A-1 MERCK & CO INC COM Stock 58933Y105 26,166 0 2,853 1.0524
2024-05-03 2024-03-31 13F MERCK & CO INC COM Stock 58933Y105 26,166 0 3,453 1.1563
2024-05-23 2023-12-31 13F/A-1 MERCK & CO INC COM Stock 58933Y105 26,166 -450 -1.69 2,853 4.09 1.0524
2024-02-09 2023-12-31 13F MERCK & CO INC COM Stock 58933Y105 26,166 -450 2,853 0.6776
2023-11-14 2023-09-30 13F MERCK & CO INC COM Stock 58933Y105 26,616 1,500 5.97 2,740 -5.45 0.6851
2023-08-11 2023-06-30 13F MERCK & CO INC COM Stock 58933Y105 25,116 -1,750 -6.51 2,898 1.40 0.6814
2023-05-11 2023-03-31 13F MERCK & CO INC COM Stock 58933Y105 26,866 1,356 5.32 2,858 0.99 0.6407
2023-02-15 2022-12-31 13F MERCK & CO INC COM Stock 58933Y105 25,510 -900 -3.41 2,830 24.45 0.6432
2022-11-14 2022-09-30 13F MERCK & CO INC COM Stock 58933Y105 26,410 400 1.54 2,274 -4.09 0.9921
2022-08-12 2022-06-30 13F MERCK & CO INC COM Stock 58933Y105 26,010 0 0.00 2,371 11.11 0.5746
2022-05-09 2022-03-31 13F MERCK COM 58933Y105 26,010 -100 -0.38 2,134 6.65 0.7019
2022-02-15 2021-12-31 13F MERCK COM 58933Y105 26,110 700 2.75 2,001 4.82 0.3997
2021-11-10 2021-09-30 13F MERCK COM 58933Y105 25,410 1,000 4.10 1,909 0.58 0.6661
2021-08-12 2021-06-30 13F MERCK COM 58933Y105 24,410 -410 -1.65 1,898 -0.78 0.6264
2021-05-12 2021-03-31 13F MERCK COM 58933Y105 24,820 600 2.48 1,913 -3.43 0.6855
2021-02-09 2020-12-31 13F MERCK COM 58933Y105 24,220 2,200 9.99 1,981 8.43 0.7096
2020-11-10 2020-09-30 13F MERCK COM 58933Y105 22,020 475 2.20 1,827 9.66 0.7676
2020-08-05 2020-06-30 13F MERCK COM 58933Y105 21,545 200 0.94 1,666 1.46 0.7303
2020-05-07 2020-03-31 13F MERCK COM 58933Y105 21,345 4,625 27.66 1,642 7.96 0.9054
2020-02-11 2019-12-31 13F MERCK COM 58933Y105 16,720 11,070 195.93 1,521 219.54 0.6741
2019-11-05 2019-09-30 13F MERCK COM 58933Y105 5,650 -10,160 -64.26 476 -64.10 0.7352
2019-08-08 2019-06-30 13F MERCK COM 58933Y105 15,810 0 0.00 1,326 0.84 0.6255
2019-05-10 2019-03-31 13F MERCK COM 58933Y105 15,810 0 0.00 1,315 8.86 0.6698
2019-02-11 2018-12-31 13F MERCK COM 58933Y105 15,810 3,280 26.18 1,208 35.88 0.6914
2018-11-06 2018-09-30 13F MERCK COM 58933Y105 12,530 -400 -3.09 889 13.25 0.4817
2018-08-02 2018-06-30 13F MERCK COM 58933Y105 12,930 0 0.00 785 11.51 0.4069
2018-08-28 2018-03-31 13F/A-1 MERCK COM 58933Y105 12,930 0 0.00 704 -3.30 0.3798
2018-05-03 2018-03-31 13F MERCK COM 58933Y105 12,930 0 704
2018-02-06 2017-12-31 13F MERCK COM 58933Y105 12,930 0 0.00 728 -12.08 0.3915
2017-11-06 2017-09-30 13F MERCK COM 58933Y105 12,930 0 0.00 828 -0.12 0.2736
2017-07-25 2017-06-30 13F MERCK COM 58933Y105 12,930 0 0.00 829 0.85 0.2862
2017-05-03 2017-03-31 13F MERCK COM 58933Y105 12,930 0 0.00 822 8.02 0.2471
2017-02-02 2016-12-31 13F MERCK COM 58933Y105 12,930 0 0.00 761 -5.70 0.3984
2016-11-01 2016-09-30 13F MERCK COM 58933Y105 12,930 0 0.00 807 8.32 0.4096
2016-08-15 2016-06-30 13F MERCK COM 58933Y105 12,930 0 0.00 745 8.92 0.4625
2016-05-26 2016-03-31 13F MERCK COM 58933Y105 12,930 900 7.48 684 7.72 0.4557
2016-02-08 2015-12-31 13F MERCK COM 58933Y105 12,030 0 0.00 635 6.90 0.4216
2015-11-24 2015-09-30 13F MERCK COM 58933Y105 12,030 0 0.00 594 -13.28 0.4492
2015-07-22 2015-06-30 13F MERCK COM 58933Y105 12,030 0 0.00 685 -0.87 0.2280
2015-05-21 2015-03-31 13F MERCK COM 58933Y105 12,030 125 1.05 691 2.22 0.4078
2015-02-12 2014-12-31 13F MERCK COM 58933Y105 11,905 8,477 247.29 676 233.00 0.3857
2014-11-14 2014-09-30 13F MERCK COM 58933Y105 3,428 -6,177 -64.31 203 -63.49 0.1278
2014-08-06 2014-06-30 13F MERCK COM 58933Y105 9,605 0 0.00 556 2.02 0.3477
2014-05-13 2014-03-31 13F MERCK COM 58933Y105 9,605 -500 -4.95 545 7.71 0.3437
2014-02-28 2013-12-31 13F/A-1 MERCK COM 58933Y105 10,105 -225 -2.18 506 2.85 0.3420
2014-02-11 2013-12-31 13F MERCK COM 58933Y105 52,828 2,644
2013-11-15 2013-09-30 13F MERCK COM 58933Y105 10,330 0 0.00 492 2.50 0.3889
2013-08-14 2013-06-30 13F MERCK COM 58933Y105 10,330 10,330 480 0.0145
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.