Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionMONECO Advisors, LLC
Latest Disclosed Ownership13,015 shares
Latest Disclosed Value $ 1,565,620
MONECO Advisors, LLC ownership in MRK / Merck & Co., Inc.

On May 7, 2026 - MONECO Advisors, LLC filed a 13F-HR form disclosing ownership of 13,015 shares of Merck & Co., Inc. (MX:MRK) valued at $1,565,620 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 12,489 shares of Merck & Co., Inc.. This represents a change in shares of 4.21% during the quarter.

MONECO 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)
2026-05-07 2026-03-31 13F MERCK COM 58933Y105 13,015 526 4.21 1,566 19.10 0.1214
2026-02-04 2025-12-31 13F MERCK COM 58933Y105 12,489 186 1.51 1,315 27.33 0.1044
2025-11-05 2025-09-30 13F MERCK COM 58933Y105 12,303 99 0.81 1,033 6.83 0.0862
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 12,204 89 0.73 966 -11.13 0.0899
2025-08-15 2025-03-31 13F/A-1 MERCK COM 58933Y105 12,115 -1,332 -9.91 1,087 -18.70 0.1126
2025-05-08 2025-03-31 13F MERCK COM 58933Y105 13,325 -277 1,196 0.1230
2025-08-15 2024-12-31 13F/A-1 MERCK COM 58933Y105 13,447 2,596 23.92 1,338 8.52 0.1411
2025-02-04 2024-12-31 13F MERCK COM 58933Y105 13,602 2,751 1,353 0.1427
2024-10-25 2024-09-30 13F MERCK COM 58933Y105 10,851 -373 -3.32 1,232 -11.30 0.1534
2024-07-19 2024-06-30 13F MERCK COM 58933Y105 11,224 -372 -3.21 1,389 -9.22 0.2042
2024-07-19 2024-03-31 13F/A-1 MERCK COM 58933Y105 11,596 777 7.18 1,530 29.77 0.2429
2024-04-25 2024-03-31 13F MERCK COM 58933Y105 11,096 277 1,464 0.2371
2024-03-13 2023-12-31 13F/A-1 MERCK COM 58933Y105 10,819 243 2.30 1,179 8.36 0.2248
2024-02-05 2023-12-31 13F MERCK COM 58933Y105 10,764 203 1,173 0.2235
2024-03-13 2023-09-30 13F/A-1 MERCK COM 58933Y105 10,576 543 5.41 1,089 -5.96 0.2954
2023-11-06 2023-09-30 13F MERCK COM 58933Y105 10,561 541 1,087 0.3027
2024-03-13 2023-06-30 13F/A-1 MERCK COM 58933Y105 10,033 -104 -1.03 1,158 7.33 0.3151
2023-08-03 2023-06-30 13F MERCK COM 58933Y105 10,020 -117 1,156 0.3174
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 10,137 3,363 49.65 1,078 43.54 0.3172
2023-01-30 2022-12-31 13F MERCK COM 58933Y105 6,774 -68 -0.99 752 27.50 0.2716
2022-11-02 2022-09-30 13F MERCK COM 58933Y105 6,842 -100 -1.44 589 -6.95 0.2357
2022-08-10 2022-06-30 13F MERCK COM 58933Y105 6,942 409 6.26 633 18.10 0.2457
2022-05-09 2022-03-31 13F MERCK COM 58933Y105 6,533 320 5.15 536 9.16 0.1969
2022-02-08 2021-12-31 13F MERCK COM 58933Y105 6,213 187 3.10 491 8.39 0.1845
2021-11-03 2021-09-30 13F MERCK COM 58933Y105 6,026 1,291 27.27 453 23.10 0.1787
2021-08-10 2021-06-30 13F MERCK COM 58933Y105 4,735 12 0.25 368 1.10 0.1694
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 4,723 10 0.21 364 -6.19 0.1769
2021-01-22 2020-12-31 13F MERCK & CO. COM 58933Y105 4,713 727 18.24 388 17.22 0.2141
2020-10-20 2020-09-30 13F MERCK & CO. COM 58933Y105 3,986 232 6.18 331 14.14 0.2110
2020-07-31 2020-06-30 13F MERCK & CO. COM 58933Y105 3,754 167 4.66 290 5.07 0.2271
2020-05-11 2020-03-31 13F MERCK & CO. COM 58933Y105 3,587 -105 -2.84 276 -17.86 0.2824
2020-01-21 2019-12-31 13F MERCK COM 58933Y105 3,692 219 6.31 336 15.07 0.2390
2019-10-31 2019-09-30 13F MERCK COM 58933Y105 3,473 792 29.54 292 29.78 0.2270
2019-07-24 2019-06-30 13F MERCK COM 58933Y105 2,681 -235 -8.06 225 -7.41 0.1809
2019-04-26 2019-03-31 13F MERCK COM 58933Y105 2,916 135 4.85 243 14.08 0.1967
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 2,781 2,781 213 0.2478
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
(%)
2020-05-11 2020-03-31 13F MERCK COM Call 0 -100.00 0 n/a n/a n/a
2020-01-21 2019-12-31 13F MERCK COM Call 100 0 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.