Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionMendel Money Management
Latest Disclosed Ownership8,796 shares
Latest Disclosed Value $ 1,058,071
Mendel Money Management ownership in MRK / Merck & Co., Inc.

On May 4, 2026 - Mendel Money Management filed a 13F-HR form disclosing ownership of 8,796 shares of Merck & Co., Inc. (MX:MRK) valued at $1,058,071 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 9,050 shares of Merck & Co., Inc.. This represents a change in shares of -2.81% during the quarter.

Mendel Money Management has a history of taking positions in derivatives of the underlying security (MRK) in the form of stock options.

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)
2026-05-04 2026-03-31 13F MERCK COM 58933Y105 8,796 -254 -2.81 1,058 11.13 0.4427
2026-01-29 2025-12-31 13F MERCK COM 58933Y105 9,050 347 3.99 953 30.41 0.3987
2025-11-10 2025-09-30 13F MERCK COM 58933Y105 8,703 -325 -3.60 730 2.24 0.3071
2025-08-01 2025-06-30 13F MERCK COM 58933Y105 9,028 286 3.27 715 -8.93 0.3164
2025-05-06 2025-03-31 13F MERCK COM 58933Y105 8,742 659 8.15 785 -2.49 0.3717
2025-02-12 2024-12-31 13F MERCK COM 58933Y105 8,083 -15 -0.19 804 -12.51 0.3590
2024-11-07 2024-09-30 13F MERCK COM 58933Y105 8,098 -8 -0.10 920 -8.37 0.3976
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 8,106 -70 -0.86 1,004 -6.96 0.4698
2024-05-02 2024-03-31 13F MERCK COM 58933Y105 8,176 -100 -1.21 1,079 19.51 0.4990
2024-02-14 2023-12-31 13F/A-1 MERCK COM 58933Y105 8,276 -303 -3.53 902 2.15 0.4335
2023-11-14 2023-09-30 13F/A-1 MERCK COM 58933Y105 8,579 228 2.73 883 -8.31 0.4736
2023-11-13 2023-09-30 13F Merck Common Stock 58933Y105 8,579 228 883 0.4736
2023-08-14 2023-06-30 13F Merck Common Stock 58933Y105 8,351 -99 -1.17 964 7.24 0.4954
2023-05-10 2023-03-31 13F Merck Common Stock 58933Y105 8,450 -395 -4.47 899 -8.46 0.4843
2023-02-13 2022-12-31 13F Merck Common Stock 58933Y105 8,845 -289 -3.16 981 24.65 0.5584
2022-11-14 2022-09-30 13F Merck Common Stock 58933Y105 9,134 1,000 12.29 787 6.06 0.4907
2022-08-15 2022-06-30 13F Merck Common Stock 58933Y105 8,134 -827 -9.23 742 0.95 0.4422
2022-05-16 2022-03-31 13F Merck Common Stock 58933Y105 8,961 8,961 735 0.3590
2020-07-29 2020-06-30 13F MERCK & CO INC COM Stock 58933Y105 0 -2,545 -100.00 0 -100.00
2020-02-13 2019-12-31 13F MERCK & CO INC COM Stock 58933Y105 2,545 40 1.60 231 9.48 0.1999
2019-11-08 2019-09-30 13F MERCK & CO INC COM Stock 58933Y105 2,505 -1,000 -28.53 211 -28.23 0.1950
2019-08-08 2019-06-30 13F MERCK & CO INC COM Stock 58933Y105 3,505 25 0.72 294 19.03 0.2813
2018-10-29 2018-09-30 13F MERCK & CO INC COM Stock 58933Y105 3,480 -300 -7.94 247 15.96 0.2396
2018-02-06 2017-12-31 13F MERCK & CO INC COM Stock 58933Y105 3,780 230 6.48 213 5.45 0.2044
2015-07-31 2015-06-30 13F MERCK COM 58933Y105 3,550 3,550 202 0.1881
Disclosed Put 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
(%)
2024-05-02 2024-03-31 13F MERCK COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-02-09 2023-12-31 13F MERCK COM Put 8,276 902 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.