Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCapital Wealth Planning, LLC
Latest Disclosed Ownership4,516,730 shares
Latest Disclosed Value $ 543,317,430
Capital Wealth Planning, LLC ownership in MRK / Merck & Co., Inc.

On May 15, 2026 - Capital Wealth Planning, LLC filed a 13F-HR form disclosing ownership of 4,516,730 shares of Merck & Co., Inc. (MX:MRK) valued at $543,317,430 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 5,004,197 shares of Merck & Co., Inc.. This represents a change in shares of -9.74% during the quarter.

Capital Wealth Planning, LLC has a history of taking positions in derivatives of the underlying security (MRK) in the form of stock options. The firm currently holds call options representing 46,900 of underlying shares valued at $1,000 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:MRK / Merck & Co., Inc. Historical Put/Call Ratio
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)
2026-05-15 2026-03-31 13F MERCK COM 58933Y105 4,516,730 -487,467 -9.74 543,317 2.66 2.3737
2026-02-11 2025-12-31 13F MERCK COM 58933Y105 5,004,197 1,812,755 56.80 529,233 97.58 3.4260
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 3,191,442 1,604,656 101.13 267,858 113.24 1.8880
2025-08-07 2025-06-30 13F MERCK COM 58933Y105 1,586,786 1,582,939 41,147.36 125,610 36,308.70 0.9905
2025-05-12 2025-03-31 13F MERCK COM 58933Y105 3,847 -2,056,814 -99.81 345 -99.83 0.0030
2025-02-05 2024-12-31 13F MERCK COM 58933Y105 2,060,661 -1,023,662 -33.19 204,995 -41.47 1.8958
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 3,084,323 114,890 3.87 350,256 -4.72 3.2678
2024-08-09 2024-06-30 13F MERCK COM 58933Y105 2,969,433 701,481 30.93 367,616 22.84 3.8525
2024-05-07 2024-03-31 13F MERCK COM 58933Y105 2,267,952 -245,543 -9.77 299,256 9.21 3.1994
2024-02-08 2023-12-31 13F MERCK COM 58933Y105 2,513,495 -932,081 -27.05 274,021 -22.75 3.1372
2023-11-06 2023-09-30 13F MERCK COM 58933Y105 3,445,576 -35,904 -1.03 354,722 -11.70 4.3611
2023-08-04 2023-06-30 13F MERCK COM 58933Y105 3,481,480 1,285,693 58.55 401,728 41.55 4.9575
2023-05-04 2023-03-31 13F MERCK COM 58933Y105 2,195,787 -1,332,686 -37.77 283,804 -27.51 3.8386
2023-02-03 2022-12-31 13F MERCK COM 58933Y105 3,528,473 289,305 8.93 391,484 40.34 5.7248
2022-11-09 2022-09-30 13F MERCK COM 58933Y105 3,239,168 710,813 28.11 278,957 21.02 5.0883
2022-08-08 2022-06-30 13F MERCK COM 58933Y105 2,528,355 1,242,586 96.64 230,510 118.50 4.5141
2022-05-11 2022-03-31 13F MERCK COM 58933Y105 1,285,769 1,278,331 17,186.49 105,497 18,408.25 2.1314
2022-02-04 2021-12-31 13F MERCK COM 58933Y105 7,438 -7,557 -50.40 570 -49.38 0.0126
2021-11-03 2021-09-30 13F MERCK COM 58933Y105 14,995 -1,837 -10.91 1,126 -13.98 0.0310
2021-08-03 2021-06-30 13F MERCK COM 58933Y105 16,832 257 1.55 1,309 2.43 0.0368
2021-04-19 2021-03-31 13F MERCK & CO. COM 58933Y105 16,575 -810 -4.66 1,278 -9.23 0.0417
2021-01-25 2020-12-31 13F MERCK & CO. COM 58933Y105 17,385 -706,472 -97.60 1,408 -97.66 0.0543
2020-11-10 2020-09-30 13F MERCK & CO. COM 58933Y105 723,857 45,880 6.77 60,043 14.52 2.9730
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 677,977 -223,976 -24.83 52,428 -24.45 2.9884
2020-04-30 2020-03-31 13F MERCK & CO. COM 58933Y105 901,953 58,398 6.92 69,396 -9.55 4.3699
2020-02-26 2019-12-31 13F MERCK COM 58933Y105 843,555 327,857 63.58 76,721 80.16 4.5347
2019-11-12 2019-09-30 13F MERCK E 58933Y105 515,698 -188,911 -26.81 42,586 -27.92 2.7034
2019-08-02 2019-06-30 13F MERCK E 58933Y105 704,609 666,974 1,772.22 59,081 1,787.57 4.2845
2019-05-14 2019-03-31 13F Merck E 58933Y105 37,635 30,135 401.80 3,130 446.25 2.0517
2019-02-12 2018-12-31 13F Merck E 58933Y105 7,500 0 0.00 573 7.71 0.3800
2018-11-13 2018-09-30 13F Merck E 58933Y105 7,500 0 0.00 532 16.92 0.3630
2018-08-13 2018-06-30 13F Merck E 58933Y105 7,500 0 0.00 455 11.25 0.3167
2018-05-15 2018-03-31 13F Merck E 58933Y105 7,500 7,500 409 0.2843
2018-02-14 2017-12-31 13F Merck E 58933Y105 0 -8,000 -100.00 0 -100.00
2017-11-15 2017-09-30 13F Merck E 58933Y105 8,000 -38,900 -82.94 512 51,100.00 0.4033
2017-08-10 2017-06-30 13F Merck CALL 58933Y105 46,900 46,900 1 0.0002
2017-08-10 2017-06-30 13F Merck COM 58933Y905 402,373 394,373 25,788 4.1285
2017-05-10 2017-03-31 13F Merck E 58933Y105 8,000 0 0.00 508 7.86 0.4290
2017-02-15 2016-12-31 13F Merck E 58933Y105 8,000 0 0.00 471 -5.61 0.4163
2016-11-15 2016-09-30 13F Merck E 58933Y105 8,000 0 0.00 499 7.54 0.3853
2016-08-12 2016-06-30 13F Merck E 58933Y105 8,000 0 0.00 464 9.69 0.3497
2016-05-12 2016-03-31 13F Merck E 58933Y105 8,000 0 0.00 423 0.00 0.3042
2016-02-12 2015-12-31 13F Merck E 58933Y105 8,000 0 0.00 423 7.09 0.3882
2015-11-13 2015-09-30 13F Merck E 58933Y105 8,000 0 0.00 395 -13.19 0.3148
2015-08-13 2015-06-30 13F Merck E 58933Y105 8,000 -4,000 -33.33 455 -34.06 0.2716
2015-05-13 2015-03-31 13F Merck E 58933Y105 12,000 -250 -2.04 690 -0.72 0.3594
2015-02-13 2014-12-31 13F/A-1 Merck E 58933Y105 12,250 0 0.00 695 -4.27 0.3241
2014-11-17 2014-09-30 13F Merck E 58933Y105 12,250 0 0.00 726 2.40 0.2945
2014-08-20 2014-06-30 13F Merck E 58933Y105 12,250 0 0.00 709 2.01 0.2621
2014-05-16 2014-03-31 13F Merck E 58933Y105 12,250 12,250 53.12 695 82.41 0.2992
2014-02-10 2013-12-31 13F Merck E 58933Y105 0 -8,000 -100.00 0 -100.00
2013-11-14 2013-09-30 13F Merck E 58933Y105 8,000 8,000 381 0.1715
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2017-08-10 2017-06-30 13F Merck CALL 46,900 1 n/a n/a n/a
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.