Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionPhiladelphia Trust Co
Latest Disclosed Ownership52,416 shares
Latest Disclosed Value $ 6,305
Philadelphia Trust Co reports 0.50% decrease in ownership of MRK / Merck & Co., Inc.

On May 13, 2026 - Philadelphia Trust Co filed a 13F-HR form disclosing ownership of 52,416 shares of Merck & Co., Inc. (MX:MRK) valued at $6,305 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 52,681 shares of Merck & Co., Inc.. This represents a change in shares of -0.50% 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 52,416 -265 -0.50 6 20.00 0.4450
2026-02-12 2025-12-31 13F MERCK COM 58933Y105 52,681 350 0.67 6 25.00 0.3823
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 52,331 -360 -0.68 4 0.00 0.3092
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 52,691 -275 -0.52 4 0.00 0.3200
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 52,966 -4,317 -7.54 5 -20.00 0.4070
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 57,283 -8 -0.01 6 -16.67 0.4180
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 57,291 10,089 21.37 7 20.00 0.4722
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 47,202 173 0.37 6 -16.67 0.4541
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 47,029 -564 -1.19 6 20.00 0.4982
2024-02-09 2023-12-31 13F MERCK COM 58933Y105 47,593 -25 -0.05 5 25.00 0.4871
2023-11-09 2023-09-30 13F MERCK COM 58933Y105 47,618 855 1.83 5 -20.00 0.5036
2023-08-07 2023-06-30 13F MERCK COM 58933Y105 46,763 -1,282 -2.67 5 0.00 0.5107
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 48,045 -55 -0.11 5 0.00 0.5206
2023-02-07 2022-12-31 13F MERCK COM 58933Y105 48,100 -4,838 -9.14 5 -99.89 0.5716
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 52,938 4,528 9.35 4,559 3.29 0.5156
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 48,410 664 1.39 4,414 12.66 0.4532
2022-05-05 2022-03-31 13F MERCK COM 58933Y105 47,746 922 1.97 3,918 9.17 0.3091
2022-02-09 2021-12-31 13F MERCK COM 58933Y105 46,824 -1,775 -3.65 3,589 -1.67 0.2599
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 48,599 -1,498 -2.99 3,650 -6.31 0.2690
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 50,097 -1,101 -2.15 3,896 -1.29 0.2686
2021-05-14 2021-03-31 13F MERCK COM 58933Y105 51,198 -4,495 -8.07 3,947 -13.37 0.3034
2021-02-08 2020-12-31 13F MERCK COM 58933Y105 55,693 1,310 2.41 4,556 1.00 0.3714
2020-11-12 2020-09-30 13F MERCK COM 58933Y105 54,383 5,233 10.65 4,511 18.68 0.4349
2020-08-14 2020-06-30 13F MERCK COM 58933Y105 49,150 -634 -1.27 3,801 -0.76 0.4003
2020-05-12 2020-03-31 13F MERCK COM 58933Y105 49,784 -9,382 -15.86 3,830 -28.82 0.4826
2020-02-10 2019-12-31 13F MERCK COM 58933Y105 59,166 208 0.35 5,381 8.42 0.4616
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 58,958 8,440 16.71 4,963 17.16 0.4607
2019-08-08 2019-06-30 13F MERCK COM 58933Y105 50,518 -3,152 -5.87 4,236 -5.11 0.3731
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 53,670 30,025 126.98 4,464 147.04 0.3938
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 23,645 -1,500 -5.97 1,807 1.29 0.1930
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 25,145 170 0.68 1,784 17.68 0.1464
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 24,975 75 0.30 1,516 11.80 0.1356
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 24,900 -2,514 -9.17 1,356 -12.12 0.1129
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 27,414 -1,250 -4.36 1,543 -15.91 0.1213
2017-11-13 2017-09-30 13F MERCK COM 58933Y105 28,664 1,165 4.24 1,835 4.14 0.1507
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 27,499 354 1.30 1,762 2.14 0.1498
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 27,145 4,608 20.45 1,725 29.99 0.1417
2017-03-29 2016-12-31 13F/A-1 MERCK COM 58933Y105 22,537 -18 -0.08 1,327 -5.75 0.1060
2017-02-10 2016-12-31 13F MERCK COM 58933Y105 22,537 1,327
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 22,555 1,702 8.16 1,408 17.24 0.1218
2016-08-12 2016-06-30 13F MERCK COM 58933Y105 20,853 500 2.46 1,201 11.51 0.1039
2016-05-13 2016-03-31 13F MERCK COM 58933Y105 20,353 -1,100 -5.13 1,077 -5.28 0.0923
2016-02-09 2015-12-31 13F Merck COM 58933Y105 21,453 -25 -0.12 1,137 7.16 0.0953
2015-11-16 2015-09-30 13F MERCK COM 58933Y105 21,478 20,398 1,888.70 1,061 5,794.44 0.0958
2015-08-14 2015-06-30 13F MERCK COM 58933Y105 1,080 -17,908 -94.31 19 -98.35 0.0700
2015-05-14 2015-03-31 13F MERCK COM 58933Y105 18,988 15 0.08 1,091 1.30 0.0832
2015-02-10 2014-12-31 13F MERCK COM 58933Y105 18,973 310 1.66 1,077 -2.62 0.0866
2014-11-13 2014-09-30 13F MERCK COM 58933Y105 18,663 -5,770 -23.62 1,106 -21.73 0.0686
2014-08-13 2014-06-30 13F MERCK COM 58933Y105 24,433 424 1.77 1,413 3.67 0.0878
2014-05-13 2014-03-31 13F MERCK COM 58933Y105 24,009 1,975 8.96 1,363 23.57 0.0859
2014-02-14 2013-12-31 13F MERCK COM 58933Y105 22,034 1,815 8.98 1,103 14.54 0.0702
2013-11-15 2013-09-30 13F MERCK COM 58933Y105 20,219 270 1.35 963 3.88 0.0665
2013-08-14 2013-06-30 13F MERCK COM 58933Y105 19,949 19,949 927 0.0694
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.