Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRoyal Fund Management, LLC
Latest Disclosed Ownership68,809 shares
Latest Disclosed Value $ 8,276,203
Royal Fund Management, LLC ownership in MRK / Merck & Co., Inc.

On May 19, 2026 - Royal Fund Management, LLC filed a 13F-HR form disclosing ownership of 68,809 shares of Merck & Co., Inc. (MX:MRK) valued at $8,276,203 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 15, 2026 disclosing 69,200 shares of Merck & Co., Inc.. This represents a change in shares of -0.57% during the quarter.

Royal Fund Management, 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)
2026-05-19 2026-03-31 13F MERCK COM 58933Y105 68,809 -391 -0.57 8,276 13.60 0.7854
2026-01-15 2025-12-31 13F MERCK COM 58933Y105 69,200 4,380 6.76 7,285 33.89 0.6625
2025-10-29 2025-09-30 13F MERCK COM 58933Y105 64,820 -3,853 -5.61 5,441 0.09 0.6478
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 68,673 7,805 12.82 5,436 -1.18 0.5395
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 60,868 5,474 9.88 5,502 -0.92 0.6123
2025-01-16 2024-12-31 13F MERCK COM 58933Y105 55,394 1,161 2.14 5,552 -10.49 0.5180
2024-10-08 2024-09-30 13F MERCK COM 58933Y105 54,233 4,740 9.58 6,204 0.44 0.3698
2024-07-18 2024-06-30 13F MERCK COM 58933Y105 49,493 -4,213 -7.84 6,176 -12.83 0.5003
2024-04-11 2024-03-31 13F MERCK COM 58933Y105 53,706 -4,859 -8.30 7,086 10.93 0.6963
2024-02-06 2023-12-31 13F MERCK COM 58933Y105 58,565 880 1.53 6,388 7.56 0.7073
2023-10-17 2023-09-30 13F MERCK COM 58933Y105 57,685 -32 -0.06 5,939 -10.84 0.8039
2023-07-12 2023-06-30 13F MERCK COM 58933Y105 57,717 -641 -1.10 6,660 7.28 0.8280
2023-04-10 2023-03-31 13F MERCK COM 58933Y105 58,358 -2,360 -3.89 6,209 -7.84 0.8883
2023-01-20 2022-12-31 13F MERCK COM 58933Y105 60,718 -99 -0.16 6,737 28.62 1.0715
2022-11-14 2022-09-30 13F MERCK & CO INC COM COM 58933Y105 60,817 -1,453 -2.33 5,237 -7.75 0.9519
2022-07-28 2022-06-30 13F MERCK & CO INC COM COM 58933Y105 62,270 58 0.09 5,677 11.23 0.9434
2022-05-13 2022-03-31 13F MERCK & CO INC COM COM 58933Y105 62,212 -1,768 -2.76 5,104 4.10 0.7393
2022-02-11 2021-12-31 13F MERCK & CO INC COM COM 58933Y105 63,980 -458 -0.71 4,903 1.32 0.7027
2021-10-20 2021-09-30 13F MERCK & CO INC COM COM 58933Y105 64,438 1,708 2.72 4,839 -0.80 0.7050
2021-07-26 2021-06-30 13F MERCK & CO INC COM COM 58933Y105 62,730 10,876 20.97 4,878 22.04 0.8076
2021-04-29 2021-03-31 13F MERCK & CO INC COM COM 58933Y105 51,854 14,399 38.44 3,997 30.49 0.7311
2021-02-02 2020-12-31 13F MERCK & CO INC COM COM 58933Y105 37,455 2,438 6.96 3,063 5.48 0.6487
2020-10-13 2020-09-30 13F MERCK & CO INC COM COM 58933Y105 35,017 4,389 14.33 2,904 22.64 0.7427
2020-08-06 2020-06-30 13F MERCK & CO INC COM COM 58933Y105 30,628 5,037 19.68 2,368 20.33 0.8351
2020-05-08 2020-03-31 13F MERCK & CO INC COM COM 58933Y105 25,591 20,683 421.41 1,968 341.26 0.8022
2020-05-11 2019-12-31 13F MERCK & CO INC COM COM 58933Y105 4,908 -625 -11.30 446 -4.09 0.1135
2020-05-08 2019-09-30 13F MERCK & CO INC COM COM 58933Y105 5,533 -36 -0.65 465 -0.21 0.1297
2020-05-08 2019-06-30 13F MERCK & CO INC COM COM 58933Y105 5,569 -427 -7.12 466 -6.43 0.1382
2020-05-11 2019-03-31 13F MERCK & CO INC COM COM 58933Y105 5,996 3,351 126.69 498 146.53 0.1588
2020-05-07 2018-12-31 13F MERCK & CO INC COM COM 58933Y105 2,645 23 0.88 202 8.60 0.0819
2020-05-07 2018-09-30 13F MERCK & CO INC COM COM 58933Y105 2,622 -266 -9.21 186 6.29 0.0579
2020-05-07 2018-06-30 13F MERCK & CO INC COM COM 58933Y105 2,888 -1,285 -30.79 175 -22.91 0.0578
2020-05-07 2018-03-31 13F MERCK & CO INC COM COM 58933Y105 4,173 -94 -2.20 227 -5.42 0.0829
2020-05-07 2017-12-31 13F MERCK & CO INC COM COM 58933Y105 4,267 -116,846 -96.48 240 -96.90 0.0861
2020-05-07 2017-09-30 13F MERCK & CO INC COM COM 58933Y105 121,113 -1,586 -1.29 7,754 -1.39 3.0885
2020-05-07 2017-06-30 13F MERCK & CO INC COM COM 58933Y105 122,699 15,517 14.48 7,863 15.46 3.3355
2020-05-07 2017-03-31 13F MERCK & CO INC COM COM 58933Y105 107,182 7,859 7.91 6,810 16.47 3.2870
2020-05-07 2016-12-31 13F MERCK & CO INC COM COM 58933Y105 99,323 99,323 5,847 3.2446
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
(%)
2026-01-15 2025-12-31 13F MERCK COM Call 0 -100.00 0 n/a n/a n/a
2025-10-29 2025-09-30 13F MERCK COM Call 23 -99.00 1 -100.00 n/a n/a n/a
2025-08-13 2025-06-30 13F MERCK COM Call 2,300 138 n/a n/a n/a
2025-01-16 2024-12-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-10-08 2024-09-30 13F MERCK COM Call 300 34 n/a n/a n/a
2023-04-10 2023-03-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-01-20 2022-12-31 13F MERCK COM Call 2,900 322 n/a n/a n/a
2022-07-28 2022-06-30 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-05-13 2022-03-31 13F MERCK COM Call 2,700 221 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.