Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionArkadios Wealth Advisors
Latest Disclosed Ownership146,131 shares
Latest Disclosed Value $ 17,578,061
Arkadios Wealth Advisors ownership in MRK / Merck & Co., Inc.

On May 18, 2026 - Arkadios Wealth Advisors filed a 13F-HR form disclosing ownership of 146,131 shares of Merck & Co., Inc. (MX:MRK) valued at $17,578,061 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 141,002 shares of Merck & Co., Inc.. This represents a change in shares of 3.64% during the quarter.

Arkadios Wealth Advisors 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 800 of underlying shares valued at $96,232 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)
2026-05-18 2026-03-31 13F MERCK & CO INC COM Stock 58933Y105 146,131 5,129 3.64 17,578 18.44 0.1851
2026-02-13 2025-12-31 13F MERCK & CO INC COM Stock 58933Y105 141,002 61,036 76.33 14,842 121.14 0.2877
2025-10-29 2025-09-30 13F MERCK & CO INC COM Stock 58933Y105 79,966 12,885 19.21 6,712 26.38 0.1610
2025-08-04 2025-06-30 13F MERCK & CO INC COM Stock 58933Y105 67,081 21,581 47.43 5,310 30.02 0.1566
2025-05-08 2025-03-31 13F MERCK & CO INC COM Stock 58933Y105 45,500 8,909 24.35 4,084 12.20 0.1543
2025-01-15 2024-12-31 13F MERCK & CO INC COM Stock 58933Y105 36,591 -6,018 -14.12 3,640 -24.76 0.1985
2024-10-24 2024-09-30 13F MERCK & CO INC COM Stock 58933Y105 42,609 757 1.81 4,839 -6.62 0.2741
2024-07-29 2024-06-30 13F MERCK & CO INC COM Stock 58933Y105 41,852 10,057 31.63 5,181 23.50 0.3495
2024-04-30 2024-03-31 13F MERCK & CO INC COM Stock 58933Y105 31,795 6,250 24.47 4,195 50.68 0.3252
2024-01-24 2023-12-31 13F MERCK & CO INC COM Stock 58933Y105 25,545 -2,253 -8.10 2,785 -2.69 0.2355
2023-10-13 2023-09-30 13F MERCK & CO INC COM Stock 58933Y105 27,798 10,714 62.71 2,862 45.15 0.2715
2023-07-26 2023-06-30 13F MERCK & CO INC COM Stock 58933Y105 17,084 41 0.24 1,971 8.71 0.2292
2023-05-02 2023-03-31 13F MERCK & CO INC COM Stock 58933Y105 17,043 -218 -1.26 1,813 -5.33 0.2159
2023-01-11 2022-12-31 13F MERCK & CO INC COM Stock 58933Y105 17,261 304 1.79 1,915 191,400.00 0.2539
2022-10-21 2022-09-30 13F MERCK & CO INC COM Stock 58933Y105 16,957 1,482 9.58 1 0.00 0.2213
2022-07-14 2022-06-30 13F MERCK & CO INC COM Stock 58933Y105 15,475 1,233 8.66 1 0.00 0.2099
2022-05-02 2022-03-31 13F MERCK & CO INC COM Stock 58933Y105 14,242 5 0.04 1 0.00 0.1531
2022-02-03 2021-12-31 13F MERCK & CO INC COM Stock 58933Y105 14,237 -1,395 -8.92 1 0.00 0.1445
2021-10-19 2021-09-30 13F MERCK CO INC COM Stock 58933Y105 15,632 -1,703 -9.82 1 0.00 0.1693
2021-07-28 2021-06-30 13F MERCK & CO INC COM Stock 58933Y105 17,335 5,021 40.77 1 0.1642
2021-04-26 2021-03-31 13F MERCK & CO. INC COM Stock 58933Y105 12,314 2,561 26.26 1 0.1563
2021-02-09 2020-12-31 13F MERCK & CO. INC COM Stock 58933Y105 9,753 3,458 54.93 1 -100.00 0.1672
2020-11-10 2020-09-30 13F MERCK CO. INC COM Common Stock 58933Y105 6,295 43 0.69 503 2.66 0.2521
2020-08-10 2020-06-30 13F MERCK & CO. INC COM Common Stock 58933Y105 6,252 913 17.10 489 19.27 0.2714
2020-05-14 2020-03-31 13F MERCK & CO. INC COM Common Stock 58933Y105 5,339 490 10.11 411 3.27 0.2618
2020-02-14 2019-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 4,849 4,849 397 0.2381
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
(%)
2026-05-18 2026-03-31 13F MERCK & CO INC COM Stock Call 800 0.00 96 14.29 n/a n/a n/a
2026-02-13 2025-12-31 13F MERCK & CO INC COM Stock Call 800 0.00 84 25.37 n/a n/a n/a
2025-10-29 2025-09-30 13F MERCK & CO INC COM Stock Call 800 0.00 67 6.35 n/a n/a n/a
2025-08-04 2025-06-30 13F MERCK & CO INC COM Stock Call 800 63 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.