Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionBuckley Wealth Management, LLC
Latest Disclosed Ownership54,553 shares
Latest Disclosed Value $ 6,608,550
Buckley Wealth Management, LLC reports 0.91% decrease in ownership of MRK / Merck & Co., Inc.

On May 13, 2026 - Buckley Wealth Management, LLC filed a 13F-HR form disclosing ownership of 54,553 shares of Merck & Co., Inc. (MX:MRK) valued at $6,608,550 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 55,053 shares of Merck & Co., Inc.. This represents a change in shares of -0.91% 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)
2026-05-13 2026-03-31 13F MERCK COM 58933Y105 54,553 -500 -0.91 6,609 14.05 1.6865
2026-02-12 2025-12-31 13F MERCK COM 58933Y105 55,053 -440 -0.79 5,795 24.41 1.5364
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 55,493 -1,857 -3.24 4,658 2.60 1.2752
2025-08-11 2025-06-30 13F MERCK COM 58933Y105 57,350 -2,300 -3.86 4,540 -15.22 1.3586
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 59,650 -500 -0.83 5,354 -10.51 1.6656
2025-02-10 2024-12-31 13F MERCK COM 58933Y105 60,150 -1,530 -2.48 5,984 -14.58 1.8319
2024-10-18 2024-09-30 13F MERCK COM 58933Y105 61,680 -1,500 -2.37 7,004 -10.45 2.1576
2024-07-24 2024-06-30 13F MERCK COM 58933Y105 63,180 -343 -0.54 7,822 -6.68 2.4790
2024-04-16 2024-03-31 13F MERCK COM 58933Y105 63,523 -400 -0.63 8,382 20.28 2.6877
2024-01-18 2023-12-31 13F MERCK COM 58933Y105 63,923 0 0.00 6,969 5.90 2.4193
2023-10-13 2023-09-30 13F MERCK COM 58933Y105 63,923 100 0.16 6,581 -10.65 2.4621
2023-07-12 2023-06-30 13F MERCK COM 58933Y105 63,823 -4,166 -6.13 7,365 1.81 2.5047
2023-04-14 2023-03-31 13F MERCK COM 58933Y105 67,989 -8,585 -11.21 7,233 -14.86 2.6636
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 76,574 -1,300 -1.67 8,496 26.66 3.0920
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 77,874 -3,390 -4.17 6,707 -9.47 2.4721
2022-08-04 2022-06-30 13F MERCK COM 58933Y105 81,264 -885 -1.08 7,409 9.93 2.3841
2022-05-06 2022-03-31 13F MERCK COM 58933Y105 82,149 -4,652 -5.36 6,740 1.32 1.8244
2022-02-02 2021-12-31 13F MERCK COM 58933Y105 86,801 -11,077 -11.32 6,652 -9.52 1.9420
2021-11-09 2021-09-30 13F MERCK COM 58933Y105 97,878 2,742 2.88 7,352 -0.64 2.3775
2021-07-27 2021-06-30 13F MERCK COM 58933Y105 95,136 579 0.61 7,399 1.51 2.5383
2021-04-30 2021-03-31 13F MERCK & CO. COM 58933Y105 94,557 6,930 7.91 7,289 1.69 2.7019
2021-01-20 2020-12-31 13F MERCK & CO. COM 58933Y105 87,627 3,729 4.44 7,168 3.00 2.9392
2020-10-19 2020-09-30 13F MERCK & CO. COM 58933Y105 83,898 -465 -0.55 6,959 6.67 3.1237
2020-07-15 2020-06-30 13F MERCK & CO. COM 58933Y105 84,363 4,351 5.44 6,524 5.98 2.9589
2020-04-10 2020-03-31 13F MERCK & CO. COM 58933Y105 80,012 3,342 4.36 6,156 -11.72 3.3402
2020-01-16 2019-12-31 13F MERCK COM 58933Y105 76,670 -257 -0.33 6,973 7.67 3.1644
2019-10-11 2019-09-30 13F MERCK COM 58933Y105 76,927 -2,430 -3.06 6,476 -2.68 3.1699
2019-07-19 2019-06-30 13F MERCK COM 58933Y105 79,357 50 0.06 6,654 0.88 3.1141
2019-04-11 2019-03-31 13F MERCK COM 58933Y105 79,307 -1,735 -2.14 6,596 6.52 3.1242
2019-02-01 2018-12-31 13F MERCK COM 58933Y105 81,042 -1,010 -1.23 6,192 6.37 3.1923
2018-10-25 2018-09-30 13F MERCK COM 58933Y105 82,052 -140 -0.17 5,821 16.68 2.5423
2018-07-31 2018-06-30 13F MERCK COM 58933Y105 82,192 86 0.10 4,989 11.56 2.3588
2018-05-08 2018-03-31 13F MERCK COM 58933Y105 82,106 26,597 47.91 4,472 43.20 2.2107
2018-02-07 2017-12-31 13F MERCK COM 58933Y105 55,509 55,509 3,123 1.5665
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.