Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCapital Planning Advisors, LLC
Latest Disclosed Ownership11,665 shares
Latest Disclosed Value $ 1,403,183
Capital Planning Advisors, LLC reports 3.83% decrease in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Capital Planning Advisors, LLC filed a 13F-HR form disclosing ownership of 11,665 shares of Merck & Co., Inc. (MX:MRK) valued at $1,403,183 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 12,129 shares of Merck & Co., Inc.. This represents a change in shares of -3.83% 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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 11,665 -464 -3.83 1,403 9.95 0.2029
2026-02-17 2025-12-31 13F MERCK COM 58933Y105 12,129 5,570 84.92 1,277 132.00 0.1707
2025-11-07 2025-09-30 13F MERCK COM 58933Y105 6,559 -5,466 -45.46 550 -42.17 0.0756
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 12,025 -14,084 -53.94 952 -59.41 0.1396
2025-05-12 2025-03-31 13F MERCK COM 58933Y105 26,109 -7,322 -21.90 2,344 -29.53 0.3618
2025-01-17 2024-12-31 13F MERCK COM 58933Y105 33,431 -11,858 -26.18 3,326 -35.35 0.5136
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 45,289 2,691 6.32 5,143 -2.47 0.7765
2024-08-12 2024-06-30 13F MERCK COM 58933Y105 42,598 888 2.13 5,274 -4.18 0.9024
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 41,710 1,158 2.86 5,504 24.50 0.9665
2024-02-12 2023-12-31 13F MERCK COM 58933Y105 40,552 589 1.47 4,421 7.44 0.8358
2023-10-30 2023-09-30 13F MERCK COM 58933Y105 39,963 -42 -0.10 4,114 -10.88 0.8585
2023-08-01 2023-06-30 13F MERCK COM 58933Y105 40,005 -670 -1.65 4,616 6.68 0.9360
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 40,675 -554 -1.34 4,327 -5.40 0.9198
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 41,229 170 0.41 4,574 29.36 1.0870
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 41,059 22,767 124.46 3,536 111.99 0.9497
2022-08-10 2022-06-30 13F MERCK COM 58933Y105 18,292 14 0.08 1,668 11.20 0.4415
2022-05-10 2022-03-31 13F MERCK COM 58933Y105 18,278 20 0.11 1,500 7.22 0.3208
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 18,258 -1,540 -7.78 1,399 -5.92 0.2664
2021-11-09 2021-09-30 13F MERCK COM 58933Y105 19,798 -15,340 -43.66 1,487 -45.59 0.3085
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 35,138 -3,400 -8.82 2,733 -8.01 0.5607
2021-04-30 2021-03-31 13F MERCK & CO. COM 58933Y105 38,538 2,810 7.86 2,971 1.64 0.6661
2021-02-04 2020-12-31 13F MERCK & CO. COM 58933Y105 35,728 -480 -1.33 2,923 -2.66 0.7183
2020-11-12 2020-09-30 13F MERCK & CO. COM 58933Y105 36,208 147 0.41 3,003 7.67 0.8230
2020-08-06 2020-06-30 13F MERCK & CO. COM 58933Y105 36,061 3,205 9.75 2,789 10.32 0.8305
2020-05-11 2020-03-31 13F MERCK & CO. COM 58933Y105 32,856 -535 -1.60 2,528 -16.76 0.9433
2020-02-03 2019-12-31 13F MERCK COM 58933Y105 33,391 1,749 5.53 3,037 14.00 0.7946
2019-11-05 2019-09-30 13F MERCK COM 58933Y105 31,642 -356 -1.11 2,664 -0.71 0.7753
2019-08-09 2019-06-30 13F MERCK COM 58933Y105 31,998 795 2.55 2,683 3.39 0.7881
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 31,203 -895 -2.79 2,595 5.79 0.7923
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 32,098 879 2.82 2,453 10.74 0.8931
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 31,219 20,317 186.36 2,215 234.59 0.7078
2018-08-08 2018-06-30 13F MERCK COM 58933Y105 10,902 10,902 662 0.2993
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 0 -3,820 -100.00 0 -100.00
2018-02-08 2017-12-31 13F MERCK COM 58933Y105 3,820 3,820 215 0.0755
2017-11-09 2017-09-30 13F MERCK COM 58933Y105 0 -3,644 -100.00 0 -100.00
2017-08-08 2017-06-30 13F MERCK COM 58933Y105 3,644 -3,754 -50.74 234 -50.21 0.1036
2017-05-12 2017-03-31 13F MERCK COM 58933Y105 7,398 0 0.00 470 7.80 0.2320
2017-02-13 2016-12-31 13F MERCK COM 58933Y105 7,398 -17,793 -70.63 436 -72.26 0.2327
2016-11-08 2016-09-30 13F MERCK COM 58933Y105 25,191 0 0.00 1,572 8.34 0.8390
2016-07-20 2016-06-30 13F MERCK COM 58933Y105 25,191 0 0.00 1,451 8.85 0.8075
2016-05-04 2016-03-31 13F MERCK & CO INC COM 58933Y105 25,191 -127 -0.50 1,333 -0.30 0.6419
2016-01-22 2015-12-31 13F MERCK & CO INC COM 58933Y105 25,318 16,638 191.68 1,337 211.66 0.7789
2015-10-20 2015-09-30 13F MERCK & CO INC COM 58933Y105 8,680 880 11.28 429 -3.38 0.2817
2015-07-22 2015-06-30 13F MERCK & CO INC COM 58933Y105 7,800 350 4.70 444 3.74 0.2605
2015-05-11 2015-03-31 13F MERCK & CO INC COM 58933Y105 7,450 7,450 428 0.2983
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.