Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionVan Cleef Asset Management,Inc
Latest Disclosed Ownership19,008 shares
Latest Disclosed Value $ 2,286,473
Van Cleef Asset Management,Inc reports 0.26% decrease in ownership of MRK / Merck & Co., Inc.

On May 1, 2026 - Van Cleef Asset Management,Inc filed a 13F-HR form disclosing ownership of 19,008 shares of Merck & Co., Inc. (MX:MRK) valued at $2,286,473 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 19,058 shares of Merck & Co., Inc.. This represents a change in shares of -0.26% 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)
2026-05-01 2026-03-31 13F MERCK COM 58933Y105 19,008 -50 -0.26 2,286 13.96 0.2462
2026-02-09 2025-12-31 13F MERCK COM 58933Y105 19,058 0 0.00 2,006 25.45 0.2034
2025-11-04 2025-09-30 13F MERCK COM 58933Y105 19,058 -300 -1.55 1,600 4.37 0.1625
2025-08-06 2025-06-30 13F MERCK COM 58933Y105 19,358 0 0.00 1,532 -11.80 0.1651
2025-04-30 2025-03-31 13F MERCK COM 58933Y105 19,358 -1,650 -7.85 1,738 -16.85 0.1965
2025-02-05 2024-12-31 13F MERCK COM 58933Y105 21,008 -60 -0.28 2,090 -12.67 0.2291
2024-11-04 2024-09-30 13F MERCK COM 58933Y105 21,068 12 0.06 2,393 -8.21 0.2655
2024-08-07 2024-06-30 13F MERCK COM 58933Y105 21,056 -150 -0.71 2,607 -6.86 0.3268
2024-05-10 2024-03-31 13F MERCK COM 58933Y105 21,206 -199 -0.93 2,798 19.93 0.3536
2024-02-02 2023-12-31 13F MERCK COM 58933Y105 21,405 -202 -0.93 2,334 4.90 0.3279
2023-11-07 2023-09-30 13F MERCK COM 58933Y105 21,607 -148 -0.68 2,224 -11.39 0.3503
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 21,755 205 0.95 2,510 9.51 0.3857
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 21,550 -149 -0.69 2,293 -4.78 0.3581
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 21,699 -201 -0.92 2,408 27.62 0.3973
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 21,900 -150 -0.68 1,886 -6.17 0.3647
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 22,050 -224 -1.01 2,010 9.96 0.3404
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 22,274 0 0.00 1,828 7.09 0.2632
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 22,274 40 0.18 1,707 2.22 0.2397
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 22,234 0 0.00 1,670 -3.41 0.2513
2021-08-16 2021-06-30 13F MERCK COM 58933Y105 22,234 0 0.00 1,729 0.88 0.2556
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 22,234 0 0.00 1,714 -5.77 0.2682
2021-02-17 2020-12-31 13F MERCK & CO. COM 58933Y105 22,234 0 0.00 1,819 -1.36 0.2973
2020-11-16 2020-09-30 13F MERCK & CO. COM 58933Y105 22,234 0 0.00 1,844 7.27 0.3446
2020-08-17 2020-06-30 13F MERCK & CO. COM 58933Y105 22,234 -8,800 -28.36 1,719 -28.02 0.3497
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 31,034 -300 -0.96 2,388 -16.21 0.5865
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 31,334 0 0.00 2,850 8.04 0.5816
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 31,334 -188 -0.60 2,638 -0.19 0.5813
2019-08-13 2019-06-30 13F MERCK COM 58933Y105 31,522 0 0.00 2,643 0.80 0.5809
2019-05-13 2019-03-31 13F MERCK COM 58933Y105 31,522 850 2.77 2,622 11.86 0.6082
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 30,672 -450 -1.45 2,344 6.16 0.6262
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 31,122 -236 -0.75 2,208 16.03 0.4928
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 31,358 1 0.00 1,903 11.42 0.4552
2018-05-04 2018-03-31 13F MERCK COM 58933Y105 31,357 -1,099 -3.39 1,708 -6.46 0.4211
2018-02-02 2017-12-31 13F MERCK COM 58933Y105 32,456 9,113 39.04 1,826 22.14 0.4501
2017-10-27 2017-09-30 13F MERCK COM 58933Y105 23,343 1 0.00 1,495 -0.07 0.4073
2017-08-04 2017-06-30 13F MERCK COM 58933Y105 23,342 -799 -3.31 1,496 -2.48 0.4361
2017-04-24 2017-03-31 13F MERCK COM 58933Y105 24,141 0 0.00 1,534 7.95 0.4667
2017-02-08 2016-12-31 13F MERCK COM 58933Y105 24,141 31 0.13 1,421 -5.58 0.4540
2016-10-18 2016-09-30 13F MERCK COM 58933Y105 24,110 -150 -0.62 1,505 7.65 0.4997
2016-08-15 2016-06-30 13F MERCK COM 58933Y105 24,260 1 0.00 1,398 8.88 0.4821
2016-04-18 2016-03-31 13F MERCK & CO INC COM 58933Y105 24,259 -75 -0.31 1,284 -0.08 0.4543
2016-01-12 2015-12-31 13F MERCK & CO INC COM 58933Y105 24,334 -424 -1.71 1,285 5.07 0.4716
2015-11-16 2015-09-30 13F MERCK & CO INC COM 58933Y105 24,758 450 1.85 1,223 -11.63 0.4837
2015-08-14 2015-06-30 13F MERCK & CO INC COM 58933Y105 24,308 -400 -1.62 1,384 -2.54 0.5152
2015-05-15 2015-03-31 13F MERCK & CO INC COM 58933Y105 24,708 -400 -1.59 1,420 -0.42 0.5278
2015-02-17 2014-12-31 13F MERCK & CO INC COM 58933Y105 25,108 10,600 73.06 1,426 65.81 0.5272
2014-11-14 2014-09-30 13F MERCK & CO INC COM 58933Y105 14,508 0 0.00 860 2.50 0.3527
2014-08-14 2014-06-30 13F MERCK & CO INC COM 58933Y105 14,508 3,000 26.07 839 28.48 0.3519
2014-05-15 2014-03-31 13F MERCK & CO INC COM 58933Y105 11,508 0 0.00 653 13.37 0.2858
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 11,508 0 0.00 576 5.11 0.2534
2013-11-14 2013-09-30 13F MERCK & CO INC COM 58933Y105 11,508 -1,400 -10.85 548 -8.67 0.2703
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 12,908 12,908 600 0.3172
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.