Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionPrivate Trust Co Na
Latest Disclosed Ownership50,144 shares
Latest Disclosed Value $ 6,031,865
Private Trust Co Na reports 2.41% increase in ownership of MRK / Merck & Co., Inc.

On April 30, 2026 - Private Trust Co Na filed a 13F-HR form disclosing ownership of 50,144 shares of Merck & Co., Inc. (MX:MRK) valued at $6,031,865 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 48,965 shares of Merck & Co., Inc.. This represents a change in shares of 2.41% 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)
2026-04-30 2026-03-31 13F Merck & Co Inc Com 58933Y105 50,144 1,179 2.41 6,032 17.02 0.5386
2026-01-26 2025-12-31 13F Merck & Co Inc Com 58933Y105 48,965 4,381 9.83 5,154 37.77 0.4515
2025-10-15 2025-09-30 13F Merck & Co Inc Com 58933Y105 44,584 207 0.47 3,742 6.52 0.3300
2025-07-29 2025-06-30 13F Merck & Co Inc Com 58933Y105 44,377 699 1.60 3,513 -10.41 0.3345
2025-04-28 2025-03-31 13F Merck & Co Inc Com 58933Y105 43,678 641 1.49 3,921 -8.43 0.4034
2025-02-05 2024-12-31 13F Merck & Co Inc Com 58933Y105 43,037 -3 -0.01 4,281 -12.40 0.4395
2024-11-13 2024-09-30 13F Merck & Co Inc Com 58933Y105 43,040 -6,464 -13.06 4,888 -20.25 0.4925
2024-07-23 2024-06-30 13F Merck & Co Inc Com 58933Y105 49,504 -390 -0.78 6,129 -6.91 0.6599
2024-04-24 2024-03-31 13F Merck & Co Inc Com 58933Y105 49,894 -405 -0.81 6,583 20.06 0.7111
2024-01-24 2023-12-31 13F Merck & Co Inc Com 58933Y105 50,299 16 0.03 5,484 5.93 0.6442
2023-10-18 2023-09-30 13F Merck & Co Inc Com 58933Y105 50,283 -583 -1.15 5,177 -11.81 0.6829
2023-07-28 2023-06-30 13F Merck & Co Inc Com 58933Y105 50,866 -104 -0.20 5,869 8.24 0.7403
2023-04-12 2023-03-31 13F Merck & Co Inc Com 58933Y105 50,970 5,214 11.40 5,423 108,340.00 0.7392
2023-01-18 2022-12-31 13F Merck & Co Inc Com 58933Y105 45,756 614 1.36 5 -99.87 0.7534
2022-10-17 2022-09-30 13F Merck & Co Inc Com 58933Y105 45,142 2,841 6.72 3,888 0.80 0.6315
2022-09-16 2022-06-30 13F/A-1 Merck & Co Inc Com 58933Y105 42,301 -8,602 -16.90 3,857 -7.66 0.5989
2022-07-13 2022-06-30 13F Merck & Co Inc Equities 58933Y105 50,903 0 4,177 0.6524
2022-04-12 2022-03-31 13F Merck & Co Inc Equities 58933Y105 50,903 8,431 19.85 4,177 28.33 0.6524
2022-01-10 2021-12-31 13F Merck & Co Inc Equities 58933Y105 42,472 -996 -2.29 3,255 -0.31 0.4494
2021-10-06 2021-09-30 13F Merck & Co Inc Equities 58933Y105 43,468 -1,342 -2.99 3,265 -6.31 0.4752
2021-07-07 2021-06-30 13F Merck & Co Inc Equities 58933Y105 44,810 -1,265 -2.75 3,485 -1.86 0.5280
2021-04-06 2021-03-31 13F Merck & Co Inc Equities 58933Y105 46,075 949 2.10 3,551 -3.79 0.5768
2021-01-05 2020-12-31 13F Merck & Co Inc Equities 58933Y105 45,126 326 0.73 3,691 -0.67 0.6217
2020-10-01 2020-09-30 13F Merck & Co Inc Equities 58933Y105 44,800 356 0.80 3,716 5.09 0.7169
2020-07-07 2020-06-30 13F Merck & Co Inc Equities 58933Y105 44,444 1,534 3.57 3,536 7.12 0.7414
2020-04-07 2020-03-31 13F Merck & Co Inc Equities 58933Y105 42,910 -14,603 -25.39 3,301 -36.88 0.8542
2020-01-02 2019-12-31 13F Merck & Co Inc Equities 58933Y105 57,513 254 0.44 5,230 8.51 0.9703
2019-10-01 2019-09-30 13F Merck & Co Inc Equities 58933Y105 57,259 -234 -0.41 4,820 0.00 0.9502
2019-07-02 2019-06-30 13F Merck & Co Inc Equities 58933Y105 57,493 -1,608 -2.72 4,820 -1.93 0.9720
2019-04-02 2019-03-31 13F Merck & Co Inc Equities 58933Y105 59,101 -1,429 -2.36 4,915 6.27 1.0224
2019-01-03 2018-12-31 13F Merck & Co Inc Equities 58933Y105 60,530 696 1.16 4,625 8.98 1.0984
2018-10-09 2018-09-30 13F Merck & Co Inc Equities 58933Y105 59,834 89 0.15 4,244 17.04 0.8659
2018-07-03 2018-06-30 13F Merck & Co Inc Equities 58933Y105 59,745 -801 -1.32 3,626 9.98 0.7860
2018-04-03 2018-03-31 13F Merck & Co Inc Equities 58933Y105 60,546 2,319 3.98 3,297 0.64 0.7207
2018-01-16 2017-12-31 13F Merck & Co Inc Equities 58933Y105 58,227 -716 -1.21 3,276 -13.20 0.6932
2017-10-12 2017-09-30 13F Merck & Co Inc Equities 58933Y105 58,943 -3,179 -5.12 3,774 -5.20 0.8214
2017-07-11 2017-06-30 13F Merck & Co Inc Equities 58933Y105 62,122 8,194 15.19 3,981 16.20 0.8682
2017-04-13 2017-03-31 13F Merck & Co Inc Equities 58933Y105 53,928 -3,739 -6.48 3,426 0.94 0.7919
2017-01-17 2016-12-31 13F Merck & Co Inc Equities 58933Y105 57,667 -5,420 -8.59 3,394 -13.79 0.8125
2016-10-13 2016-09-30 13F Merck & Co Inc Equities 58933Y105 63,087 519 0.83 3,937 9.24 0.9595
2016-07-19 2016-06-30 13F Merck & Co Inc Equities 58933Y105 62,568 10 0.02 3,604 8.92 0.9375
2016-04-18 2016-03-31 13F Merck & Co Inc Equities 58933Y105 62,558 1,290 2.11 3,309 2.26 0.8963
2016-01-19 2015-12-31 13F Merck & Co Inc Equities 58933Y105 61,268 24,808 68.04 3,236 79.78 0.9217
2015-10-27 2015-09-30 13F Merck & Co Inc Equities 58933Y105 36,460 -194 -0.53 1,800 -13.71 0.5392
2015-07-10 2015-06-30 13F Merck & Co Inc Equities 58933Y105 36,654 226 0.62 2,086 -0.33 0.5980
2015-04-09 2015-03-31 13F Merck & Co Inc Equities 58933Y105 36,428 36,428 0.00 2,093 0.5994
2015-01-28 2014-12-31 13F Merck & Co Inc Com 58933Y105 0 -27,701 -100.00 0 -100.00
2014-10-09 2014-09-30 13F Merck & Co Inc Com 58933Y105 27,701 -3,876 -12.27 1,642 -10.13 0.5575
2014-07-22 2014-06-30 13F Merck & Co Inc Com 58933Y105 31,577 2,014 6.81 1,827 8.88 0.5949
2014-04-07 2014-03-31 13F Merck & Co Inc Com 58933Y105 29,563 10,480 54.92 1,678 75.71 0.6328
2014-01-08 2013-12-31 13F Merck & Co Inc Com 58933Y105 19,083 680 3.70 955 9.02 0.3841
2013-10-07 2013-09-30 13F Merck & Co Inc Com 58933Y105 18,403 -1,166 -5.96 876 -3.63 0.3963
2013-08-01 2013-06-30 13F Merck & Co Inc Com 58933Y105 19,569 0 0.00 909 0.00 0.4174
2013-07-26 2013-03-31 13F Merck & Co Inc Com 58933Y105 19,569 19,569 909 0.4174
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.