머크 앤 컴퍼니(Merck & Co., Inc.)
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionAptus Capital Advisors, LLC
Latest Disclosed Ownership192,739 shares
Latest Disclosed Value $ 23,184,575
Aptus Capital Advisors, LLC ownership in MRK / Merck & Co., Inc.

On May 11, 2026 - Aptus Capital Advisors, LLC filed a 13F-HR form disclosing ownership of 192,739 shares of Merck & Co., Inc. (MX:MRK) valued at $23,184,575 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 207,526 shares of Merck & Co., Inc.. This represents a change in shares of -7.13% during the quarter.

Aptus Capital Advisors, 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 0 of underlying shares valued at $0 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)
2026-05-11 2026-03-31 13F MERCK COM 58933Y105 192,739 -14,787 -7.13 23,185 6.13 0.1821
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 207,526 -46,220 -18.22 21,844 2.57 0.1565
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 253,746 1,071 0.42 21,297 6.47 0.1549
2025-08-11 2025-06-30 13F MERCK COM 58933Y105 252,675 168,346 199.63 20,002 164.25 0.1630
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 84,329 -7,050 -7.72 7,569 -17.25 0.0779
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 91,379 -54,535 -37.37 9,148 -44.79 0.0958
2024-11-05 2024-09-30 13F MERCK COM 58933Y105 145,914 43,852 42.97 16,570 31.14 0.2472
2024-07-31 2024-06-30 13F MERCK COM 58933Y105 102,062 19,735 23.97 12,635 16.31 0.2225
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 82,327 10,006 13.84 10,863 37.79 0.2021
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 72,321 -1,264 -1.72 7,884 4.08 0.2156
2023-11-08 2023-09-30 13F MERCK COM 58933Y105 73,585 2,805 3.96 7,576 -7.25 0.2064
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 70,780 -4,244 -5.66 8,167 2.19 0.1959
2023-05-09 2023-03-31 13F MERCK COM 58933Y105 75,024 -15,216 -16.86 7,993 -20.18 0.2147
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 90,240 11,925 15.23 10,012 48.22 0.3074
2022-11-02 2022-09-30 13F MERCK COM 58933Y105 78,315 3,233 4.31 6,755 -1.46 0.1626
2022-07-29 2022-06-30 13F MERCK COM 58933Y105 75,082 37,678 100.73 6,855 122.78 0.1783
2022-05-04 2022-03-31 13F MERCK COM 58933Y105 37,404 29,131 352.12 3,077 382.29 0.0766
2022-02-02 2021-12-31 13F MERCK COM 58933Y105 8,273 -453 -5.19 638 -3.33 0.0192
2021-10-27 2021-09-30 13F MERCK COM 58933Y105 8,726 -30,585 -77.80 660 -78.44 0.0170
2021-07-27 2021-06-30 13F MERCK COM 58933Y105 39,311 5,224 15.33 3,061 16.30 0.0895
2021-05-06 2021-03-31 13F MERCK & CO. COM 58933Y105 34,087 -39 -0.11 2,632 -5.83 0.0944
2021-02-10 2020-12-31 13F MERCK & CO. COM 58933Y105 34,126 -264 -0.77 2,795 -2.14 0.1280
2020-10-19 2020-09-30 13F MERCK & CO. COM 58933Y105 34,390 27,101 371.81 2,856 407.28 0.1516
2020-07-22 2020-06-30 13F MERCK & CO. COM 58933Y105 7,289 -137 -1.84 563 -1.40 0.0353
2020-05-07 2020-03-31 13F MERCK & CO. COM 58933Y105 7,426 -89 -1.18 571 -16.40 0.0494
2020-02-10 2019-12-31 13F MERCK COM 58933Y105 7,515 3,915 108.75 683 125.41 0.0484
2019-11-14 2019-09-30 13F/A-1 MERCK COM 58933Y105 3,600 99 2.83 303 3.41 0.0169
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 3,600 99 303 0.0169
2019-08-13 2019-06-30 13F MERCK COM 58933Y105 3,501 933 36.33 293 37.56 0.0412
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 2,568 2,568 213 0.0364
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
(%)
2026-05-11 2026-03-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-13 2025-12-31 13F MERCK COM Call 1,500,000 157,890 n/a n/a n/a
2024-05-15 2024-03-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-02-13 2023-12-31 13F MERCK COM Call 1,000,000 109,020 n/a n/a n/a
2022-02-02 2021-12-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-10-27 2021-09-30 13F MERCK COM Call 1,600,000 120,176 n/a n/a n/a
2020-02-10 2019-12-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-11-14 2019-09-30 13F/A MERCK COM Call 200,000 16,836 n/a n/a n/a
2019-11-12 2019-09-30 13F MERCK COM Call 200,000 16,836 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.