Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRadnor Capital Management, LLC
Latest Disclosed Ownership519,443 shares
Latest Disclosed Value $ 62,483,798
Radnor Capital Management, LLC reports 0.02% decrease in ownership of MRK / Merck & Co., Inc.

On April 15, 2026 - Radnor Capital Management, LLC filed a 13F-HR form disclosing ownership of 519,443 shares of Merck & Co., Inc. (MX:MRK) valued at $62,483,798 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 519,558 shares of Merck & Co., Inc.. This represents a change in shares of -0.02% 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)
2026-04-15 2026-03-31 13F MERCK COM 58933Y105 519,443 -115 -0.02 62,484 14.25 9.2464
2026-02-06 2025-12-31 13F MERCK COM 58933Y105 519,558 -1,491 -0.29 54,689 25.06 8.1170
2025-10-21 2025-09-30 13F MERCK COM 58933Y105 521,049 -1,659 -0.32 43,732 106,560.98 6.6528
2025-07-09 2025-06-30 13F MERCK COM 58933Y105 522,708 15,210 3.00 41 -8.89 6.6014
2025-04-11 2025-03-31 13F MERCK COM 58933Y105 507,498 -13,268 -2.55 46 -11.76 7.6316
2025-01-14 2024-12-31 13F MERCK COM 58933Y105 520,766 -9,744 -1.84 52 -15.00 8.6570
2024-10-30 2024-09-30 13F MERCK COM 58933Y105 530,510 10,827 2.08 60 -6.25 8.9467
2024-07-12 2024-06-30 13F MERCK COM 58933Y105 519,683 -9,918 -1.87 64 -7.25 19.6178
2024-04-11 2024-03-31 13F MERCK COM 58933Y105 529,601 -17,933 -3.28 70 16.95 11.9157
2024-01-11 2023-12-31 13F MERCK COM 58933Y105 547,534 -17,248 -3.05 60 1.72 11.1323
2023-10-12 2023-09-30 13F MERCK COM 58933Y105 564,782 -6,895 -1.21 58 -10.77 11.5678
2023-07-07 2023-06-30 13F MERCK COM 58933Y105 571,677 -15,468 -2.63 66 4.84 28.1890
2023-04-06 2023-03-31 13F MERCK COM 58933Y105 587,145 -6,783 -1.14 62 -4.62 16.4342
2023-01-09 2022-12-31 13F MERCK COM 58933Y105 593,928 -710 -0.12 66 -99.87 16.1152
2022-10-12 2022-09-30 13F MERCK COM 58933Y105 594,638 281 0.05 51,210 -5.50 14.8503
2022-07-11 2022-06-30 13F MERCK COM 58933Y105 594,357 -20,521 -3.34 54,188 7.41 14.8213
2022-04-25 2022-03-31 13F MERCK COM 58933Y105 614,878 -29,280 -4.55 50,451 2.19 12.6584
2022-01-20 2021-12-31 13F MERCK COM 58933Y105 644,158 -15,383 -2.33 49,368 -0.34 12.1902
2021-10-26 2021-09-30 13F MERCK COM 58933Y105 659,541 42,158 6.83 49,538 3.17 29.4188
2021-07-21 2021-06-30 13F MERCK COM 58933Y105 617,383 1,050 0.17 48,014 1.05 16.2066
2021-04-26 2021-03-31 13F MERCK & CO. COM 58933Y105 616,333 -329,136 -34.81 47,513 -38.57 15.2822
2021-01-13 2020-12-31 13F MERCK & CO. COM 58933Y105 945,469 335,856 55.09 77,339 52.94 21.8184
2020-11-02 2020-09-30 13F MERCK & CO. COM 58933Y105 609,613 -1,982 -0.32 50,567 5.84 16.9416
2020-07-28 2020-06-30 13F MERCK & CO. COM 58933Y105 611,595 -1,182 -0.19 47,778 1.34 17.2606
2020-04-07 2020-03-31 13F MERCK & CO. COM 58933Y105 612,777 -17,900 -2.84 47,147 -17.81 19.3475
2020-01-10 2019-12-31 13F MERCK COM 58933Y105 630,677 -5,212 -0.82 57,360 7.16 17.7758
2019-10-07 2019-09-30 13F MERCK COM 58933Y105 635,889 5,323 0.84 53,529 1.24 17.5434
2019-07-18 2019-06-30 13F MERCK COM 58933Y105 630,566 -22,605 -3.46 52,873 -2.67 17.3977
2019-04-25 2019-03-31 13F MERCK COM 58933Y105 653,171 -33,060 -4.82 54,324 3.60 17.7807
2019-01-16 2018-12-31 13F MERCK COM 58933Y105 686,231 -9,963 -1.43 52,435 6.17 18.9238
2018-10-04 2018-09-30 13F MERCK COM 58933Y105 696,194 14,469 2.12 49,388 19.35 15.7104
2018-07-10 2018-06-30 13F Merck COM 58933Y105 681,725 -38,770 -5.38 41,381 5.44 15.3426
2018-04-20 2018-03-31 13F MERCK COM 58933Y105 720,495 -1,335 -0.18 39,245 -3.38 13.3442
2018-02-02 2017-12-31 13F Merck COM 58933Y105 721,830 470 0.07 40,617 -12.15 12.9951
2017-10-10 2017-09-30 13F Merck COM 58933Y105 721,360 0 0.00 46,232 0.00 15.6544
2017-08-09 2017-06-30 13F Merck COM 58933Y105 721,360 -11,090 -1.51 46,232 -0.66 15.6544
2017-04-20 2017-03-31 13F MERCK COM 58933Y105 732,450 -42,100 -5.44 46,540 2.07 15.7205
2017-02-03 2016-12-31 13F MERCK COM 58933Y105 774,550 774,550 45,598 15.6049
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.