Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionSaxon Interests, Inc.
Latest Disclosed Ownership3,387 shares
Latest Disclosed Value $ 407,422
Saxon Interests, Inc. ownership in MRK / Merck & Co., Inc.

On April 29, 2026 - Saxon Interests, Inc. filed a 13F-HR form disclosing ownership of 3,387 shares of Merck & Co., Inc. (MX:MRK) valued at $407,422 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 9,813 shares of Merck & Co., Inc.. This represents a change in shares of -65.48% during the quarter.

Saxon Interests, Inc. 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)
2026-04-29 2026-03-31 13F MERCK COM 58933Y105 3,387 -6,426 -65.48 407 -60.56 0.1404
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 9,813 -2,019 -17.06 1,033 3.72
2025-11-03 2025-09-30 13F MERCK COM 58933Y105 11,832 -8,770 -42.57 995 -46.19 0.3894
2025-07-17 2025-06-30 13F MERCK COM 58933Y105 20,602 0 0.00 1,849 0.00 0.8651
2025-04-25 2025-03-31 13F MERCK COM 58933Y105 20,602 1,820 9.69 1,849 -1.02 0.8651
2025-01-15 2024-12-31 13F MERCK COM 58933Y105 18,782 1,159 6.58 1,868 -6.65 0.8224
2024-10-08 2024-09-30 13F MERCK COM 58933Y105 17,623 1,801 11.38 2,001 2.20 0.9113
2024-07-18 2024-06-30 13F MERCK COM 58933Y105 15,822 701 4.64 1,959 -1.85 0.9317
2024-04-18 2024-03-31 13F MERCK COM 58933Y105 15,121 1,832 13.79 1,995 37.78 0.9512
2024-01-18 2023-12-31 13F MERCK COM 58933Y105 13,289 13,289 1,449 0.7252
2023-10-12 2023-09-30 13F MERCK COM 58933Y105 0 -12,903 -100.00 0 -100.00
2023-07-13 2023-06-30 13F MERCK COM 58933Y105 12,903 -369 -2.78 1,489 5.38 0.7971
2023-04-06 2023-03-31 13F MERCK COM 58933Y105 13,272 3,742 39.27 1,412 34.35 0.7980
2023-01-24 2022-12-31 13F MERCK & CO INC COM Stock 58933Y105 9,530 -44 -0.46 1,052 24.23 0.6001
2022-10-19 2022-09-30 13F MERCK & CO INC COM Stock 58933Y105 9,574 242 2.59 846 -0.59 0.5157
2022-07-25 2022-06-30 13F MERCK & CO INC COM Stock 58933Y105 9,332 531 6.03 851 17.87 0.5155
2022-05-16 2022-03-31 13F MERCK & COMPANY Equity 58933Y105 8,801 722 8.94 722 9.39 0.3846
2022-02-11 2021-12-31 13F MERCK & COMPANY Equity 58933Y105 8,079 8,079 660 0.3737
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
(%)
2026-04-29 2026-03-31 13F MERCK CALL Call 373 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.