머크 앤 컴퍼니(Merck & Co., Inc.)
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionFormidable Asset Management, LLC
Latest Disclosed Ownership11,270 shares
Latest Disclosed Value $ 1,186,308
Formidable Asset Management, LLC ownership in MRK / Merck & Co., Inc.

On April 22, 2026 - Formidable Asset Management, LLC filed a 13F-HR form disclosing ownership of 11,270 shares of Merck & Co., Inc. (MX:MRK) valued at $1,186,308 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 11,733 shares of Merck & Co., Inc.. This represents a change in shares of -3.95% during the quarter.

Formidable Asset 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)
2026-04-22 2026-03-31 13F MERCK COM 58933Y105 11,270 -463 -3.95 1,186 20.53 0.1832
2026-01-16 2025-12-31 13F MERCK COM 58933Y105 11,733 -1,634 -12.22 985 -6.99 0.1433
2025-10-29 2025-09-30 13F MERCK COM 58933Y105 13,367 -2,881 -17.73 1,058 -27.43 0.1666
2025-07-16 2025-06-30 13F MERCK COM 58933Y105 16,248 0 0.00 1,458 0.00 0.2439
2025-05-05 2025-03-31 13F MERCK COM 58933Y105 16,248 -5,004 -23.55 1,458 -31.03 0.2438
2025-02-19 2024-12-31 13F MERCK COM 58933Y105 21,252 -954 -4.30 2,114 -16.14 0.3472
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 22,206 -1,281 -5.45 2,522 -13.28 0.4028
2024-08-08 2024-06-30 13F MERCK COM 58933Y105 23,487 601 2.63 2,908 -3.71 0.4702
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 22,886 7,733 51.03 3,020 82.86 0.4924
2024-02-07 2023-12-31 13F MERCK COM 58933Y105 15,153 -613 -3.89 1,652 1.73 0.3431
2023-11-09 2023-09-30 13F MERCK COM 58933Y105 15,766 -85 -0.54 1,623 162,200.00 0.3596
2023-08-15 2023-06-30 13F MERCK & CO INC COM COM 58933Y105 15,851 0 0.00 2 0.00 0.3992
2023-05-09 2023-03-31 13F MERCK & CO INC COM COM 58933Y105 15,851 -358 -2.21 2 0.00 0.3630
2023-02-07 2022-12-31 13F MERCK & CO INC COM COM 58933Y105 16,209 -1 -0.01 2 -99.94 0.4062
2022-11-14 2022-09-30 13F MERCK & COMPANY COM 58933Y105 16,210 8 0.05 1,587 7.81 0.3681
2022-08-18 2022-06-30 13F/A-1 MERCK & COMPANY COM 58933Y105 16,202 654 4.21 1,472 15.36 0.3314
2022-08-16 2022-06-30 13F MERCK & COMPANY COM 58933Y105 16,202 654 1,472 0.3419
2022-05-04 2022-03-31 13F MERCK & COMPANY COM 58933Y105 15,548 -33 -0.21 1,276 6.42 0.2446
2022-02-07 2021-12-31 13F MERCK & CO INC COM COM 58933Y105 15,581 -383 -2.40 1,199 0.00 0.2301
2021-11-10 2021-09-30 13F MERCK & CO INC COM COM 58933Y105 15,964 -531 -3.22 1,199 -6.84 0.2252
2021-08-16 2021-06-30 13F/A-2 MERCK & CO INC COM Common Stock 58933Y105 16,495 -695 -4.04 1,287 -2.87 0.2764
2021-08-06 2021-06-30 13F MERCK & CO INC COM COM 58933Y105 237 -16,953 1,263 0.2976
2021-05-12 2021-03-31 13F MERCK & CO INC COM COM 58933Y105 17,190 -2,508 -12.73 1,325 -17.03 0.2880
2021-01-29 2020-12-31 13F MERCK & CO INC COM COM 58933Y105 19,698 0 0.00 1,597 0.13 0.3701
2020-12-14 2020-09-30 13F/A-1 MERCK & COMPANY. Equity 58933Y105 19,698 -260 -1.30 1,595 0.82 0.4649
2020-11-13 2020-09-30 13F MERCK & CO INC COM Common 58933Y105 19,698 -260 1,595 434,458.1122
2020-08-13 2020-06-30 13F MERCK & COMPANY. Equity 58933Y105 19,958 238 1.21 1,582 4.28 0.4665
2020-06-01 2020-03-31 13F MERCK & COMPANY. Common 58933Y105 19,720 180 0.92 1,517 -13.81 0.5973
2020-02-13 2019-12-31 13F MERCK & CO INC COM COM 58933Y105 19,540 19,540 1,760 0.5549
2019-11-08 2019-09-30 13F MERCK & CO INC COM COM 58933Y105 0 -19,586 -100.00 0 -100.00
2019-10-15 2019-06-30 13F MERCK & CO INC COM COM 58933Y105 19,586 19,586 -7.53 1,626 0.56 0.5592
2019-10-15 2019-03-31 13F MERCK & COMPANY Common 58933Y105 0 -21,181 -100.00 0 -100.00
2019-02-06 2018-12-31 13F MERCK & COMPANY Common 58933Y105 21,181 1,339 6.75 1,617 14.19 0.8551
2018-11-07 2018-09-30 13F MERCK & COMPANY Common 58933Y105 19,842 19,842 1,416 0.5576
2018-08-08 2018-06-30 13F MERCK & COMPANY Common 58933Y105 0 -22,587 -100.00 0 -100.00
2018-05-04 2018-03-31 13F MERCK & COMPANY Common 58933Y105 22,587 -819 -3.50 1,230 -6.68 0.6161
2018-02-13 2017-12-31 13F CALL: MERCK & COMP INC APR 60 EXP 4 Common 58933Y105 23,406 -2,566 -9.88 1,318 -17.98 0.6063
2017-11-13 2017-09-30 13F MERCK & COMPANY Common 58933Y105 25,972 870 3.47 1,607 -0.12 0.6781
2017-08-11 2017-06-30 13F MERCK & COMPANY Common 58933Y105 25,102 100 0.40 1,609 0.56 0.7935
2017-05-12 2017-03-31 13F MERCK & COMPANY Common 58933Y105 25,002 -969 -3.73 1,600 4.64 0.6976
2017-02-08 2016-12-31 13F MERCK & COMPANY Common 58933Y105 25,971 -100 -0.38 1,529 -6.02 0.7725
2016-11-14 2016-09-30 13F MERCK & COMPANY Common 58933Y105 26,071 80 0.31 1,627 6.48 0.8086
2016-08-12 2016-06-30 13F MERCK & COMPANY Common 58933Y105 25,991 2,100 8.79 1,528 13.78 0.8504
2016-05-10 2016-03-31 13F MERCK & CO INC COM 58933Y105 23,891 -504 -2.07 1,343 5.09 0.9439
2016-02-02 2015-12-31 13F MERCK & CO INC COM 58933Y105 24,395 -551 -2.21 1,278 3.73 0.8854
2015-11-12 2015-09-30 13F MERCK & CO INC COM 58933Y105 24,946 1,000 4.18 1,232 -9.61 0.8227
2015-08-14 2015-06-30 13F MERCK & COMPANY COM 58933Y105 23,946 0 0.00 1,363 -4.22 0.8692
2015-05-14 2015-03-31 13F MERCK & COMPANY COM 58933Y105 23,946 49 0.21 1,423 4.86 0.9361
2015-02-27 2014-12-31 13F MERCK & COMPANY COM 58933Y105 23,897 0 0.00 1,357 -3.62 0.9267
2014-11-14 2014-09-30 13F MERCK & COMPANY COM 58933Y105 23,897 9,039 60.84 1,408 63.72 0.9305
2014-08-21 2014-06-30 13F MERCK & COMPANY COM 58933Y105 14,858 0 0.00 860 2.14 0.5195
2014-05-15 2014-03-31 13F MERCK & COMPANY COM 58933Y105 14,858 110 0.75 842 4.21 0.5880
2014-02-18 2013-12-31 13F MERCK & COMPANY COM 58933Y105 14,748 0 0.00 808 13.32 0.5439
2013-11-26 2013-09-30 13F MERCK & COMPANY COM 58933Y105 14,748 14,748 713 0.6160
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
(%)
2019-10-15 2019-06-30 13F MERCK & COMPANY MAR 82.5 exp 3 Equity Options Call 0 0 n/a n/a n/a
2019-10-15 2019-03-31 13F MERCK & COMPANY MAR 82.5 exp 3 Equity Options Call 0 -100.00 0 n/a n/a n/a
2019-02-06 2018-12-31 13F MERCK & COMPANY MAR 82.5 exp 3 Equity Options Call 5 0 n/a n/a n/a
2018-02-13 2017-12-31 13F Merck & Company Incorporated Oct 70 Exp 10 Option Call 0 -100.00 0 n/a n/a n/a
2017-11-13 2017-09-30 13F Merck & Company Incorporated Oct 70 Exp 10 Option Call 10 -58.33 0 n/a n/a n/a
2017-08-11 2017-06-30 13F Merck & Company Incorporated Sep 67.50 EXP 09 Option Call 24 20.00 0 n/a n/a n/a
2017-05-12 2017-03-31 13F MERCK & COMPANY INCORPORATED JUN 67.50 EXP 06 Option Call 20 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.