Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionWolverine Asset Management Llc
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Wolverine Asset Management Llc ownership in MRK / Merck & Co., Inc.

On February 2, 2026 - Wolverine Asset Management Llc filed a 13F-HR form disclosing ownership of 0 shares of Merck & Co., Inc. (MX:MRK) valued at $0 USD as of December 31, 2025. The entity filed a previous 13F-HR on October 28, 2025 disclosing 27,121 shares of Merck & Co., Inc.. This represents a change in shares of -100.00% during the quarter.

Wolverine 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 79,500 of underlying shares valued at $9,563,055 USD and put options representing 110,200 of underlying shares valued at $13,255,958 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)
2026-02-02 2025-12-31 13F MERCK COM 58933Y105 0 -27,121 -100.00 0 -100.00
2025-10-28 2025-09-30 13F MERCK COM 58933Y105 27,121 -14,068 -34.15 2,276 -30.18 0.0168
2025-08-04 2025-06-30 13F MERCK COM 58933Y105 41,189 21,314 107.24 3,261 82.84 0.0302
2025-05-12 2025-03-31 13F MERCK COM 58933Y105 19,875 12,198 158.89 1,784 133.68 0.0213
2025-02-03 2024-12-31 13F MERCK COM 58933Y105 7,677 -8,742 -53.24 764 -59.07 0.0076
2024-11-04 2024-09-30 13F MERCK COM 58933Y105 16,419 7,303 80.11 1,865 65.25 0.0201
2024-08-01 2024-06-30 13F MERCK COM 58933Y105 9,116 9,116 1,129 0.0128
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 0 -5,532 -100.00 0 -100.00
2024-02-01 2023-12-31 13F MERCK COM 58933Y105 5,532 -37,932 -87.27 603 -86.52 0.0052
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 43,464 38,770 825.95 4,475 726.99 0.0502
2023-08-07 2023-06-30 13F MERCK COM 58933Y105 4,694 -297,534 -98.45 542 -98.32 0.0064
2023-05-08 2023-03-31 13F MERCK COM 58933Y105 302,228 269,577 825.63 32,154 787.74 0.3803
2023-02-01 2022-12-31 13F MERCK COM 58933Y105 32,651 11,176 52.04 3,623 95.89 0.0375
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 21,475 21,475 1,849 0.0199
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 0 -6,879 -100.00 0 -100.00
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 6,879 6,879 534 0.0041
2020-05-13 2020-03-31 13F MERCK COM 58933Y105 0 -1,101 -100.00 0 -100.00
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 1,101 -2,479 -69.25 100 -66.78 0.0012
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 3,580 -8,265 -69.78 301 -69.69 0.0038
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 11,845 11,845 230.87 993 229.90 0.0130
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 0 -185 -100.00 0 -100.00
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 185 -5,400 -96.69 14 -96.46 0.0002
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 5,585 -1,514 -21.33 396 -7.91 0.0046
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 7,099 -18,407 -72.17 430 -69.04 0.0056
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 25,506 -44,833 -63.74 1,389 -64.90 0.0180
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 70,339 -33,818 -32.47 3,957 -40.67 0.0400
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 104,157 -69,521 -40.03 6,669 -40.09 0.0739
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 173,678 32,816 23.30 11,131 24.37 0.1414
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 140,862 -63,176 -30.96 8,950 -25.48 0.1389
2017-02-13 2016-12-31 13F MERCK COM 58933Y105 204,038 204,038 44.85 12,011 34.20 0.1552
2016-08-25 2016-06-30 13F/A-1 MERCK & CO INC COM 58933Y105 0 -45,000 -100.00 0 -100.00
2016-05-16 2016-03-31 13F MERCK & CO INC COM 58933Y105 45,000 -544 -1.19 2,380 -1.04 0.0677
2016-02-12 2015-12-31 13F MERCK & CO INC COM 58933Y105 45,544 -11,800 -20.58 2,405 -15.08 0.0518
2015-11-17 2015-09-30 13F MERCK & CO INC COM 58933Y105 57,344 -5,900 -9.33 2,832 -21.33 0.0668
2015-08-14 2015-06-30 13F MERCK & CO INC COM 58933Y105 63,244 -11,400 -15.27 3,600 -16.08 0.0817
2015-05-15 2015-03-31 13F MERCK & CO INC COM 58933Y105 74,644 2,563 3.56 4,290 4.81 0.0855
2015-02-12 2014-12-31 13F MERCK & CO INC COM 58933Y105 72,081 40,719 129.84 4,093 120.17 0.0797
2014-11-13 2014-09-30 13F MERCK & CO INC COM 58933Y105 31,362 -33,590 -51.72 1,859 -50.52 0.0388
2014-08-13 2014-06-30 13F MERCK & CO INC COM 58933Y105 64,952 22,032 51.33 3,757 54.23 0.0823
2014-05-14 2014-03-31 13F MERCK & CO INC COM 58933Y105 42,920 -5,700 -11.72 2,436 0.12 0.0521
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 48,620 20,600 73.52 2,433 82.38 0.0482
2013-11-13 2013-09-30 13F MERCK & CO INC COM 58933Y105 28,020 -19,000 -40.41 1,334 -38.92 0.0297
2013-08-01 2013-06-30 13F MERCK & CO INC COM 58933Y105 47,020 47,020 2,184 0.0558
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
(%)
2026-05-04 2026-03-31 13F MERCK COM Call 79,500 -5.92 9,563 7.52 n/a n/a n/a
2026-02-02 2025-12-31 13F MERCK COM Call 84,500 -27.96 8,894 -9.65 n/a n/a n/a
2025-10-28 2025-09-30 13F MERCK COM Call 117,300 11.93 9,845 18.67 n/a n/a n/a
2025-08-04 2025-06-30 13F MERCK COM Call 104,800 150.72 8,296 121.14 n/a n/a n/a
2025-05-12 2025-03-31 13F MERCK COM Call 41,800 8.01 3,752 -2.55 n/a n/a n/a
2025-02-03 2024-12-31 13F MERCK COM Call 38,700 4.88 3,850 -8.14 n/a n/a n/a
2024-11-04 2024-09-30 13F MERCK COM Call 36,900 22.19 4,190 12.09 n/a n/a n/a
2024-08-01 2024-06-30 13F MERCK COM Call 30,200 -64.97 3,739 -67.14 n/a n/a n/a
2024-05-13 2024-03-31 13F MERCK COM Call 86,200 -15.57 11,374 2.19 n/a n/a n/a
2024-02-01 2023-12-31 13F MERCK COM Call 102,100 59.53 11,131 68.94 n/a n/a n/a
2023-11-13 2023-09-30 13F MERCK COM Call 64,000 47.13 6,589 31.26 n/a n/a n/a
2023-08-07 2023-06-30 13F MERCK COM Call 43,500 -45.01 5,019 -40.36 n/a n/a n/a
2023-05-08 2023-03-31 13F MERCK COM Call 79,100 97.26 8,415 89.14 n/a n/a n/a
2023-02-01 2022-12-31 13F MERCK COM Call 40,100 -57.66 4,449 -45.44 n/a n/a n/a
2022-11-10 2022-09-30 13F MERCK COM Call 94,700 -8.06 8,155 -13.15 n/a n/a n/a
2022-08-03 2022-06-30 13F MERCK COM Call 103,000 9,390 n/a n/a n/a
2018-05-15 2018-03-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-02-14 2017-12-31 13F MERCK COM Call 74,000 0.00 4,163 -12.14 n/a n/a n/a
2017-11-14 2017-09-30 13F MERCK COM Call 74,000 -61.56 4,738 -61.60 n/a n/a n/a
2017-08-14 2017-06-30 13F MERCK COM Call 192,500 1.58 12,337 2.47 n/a n/a n/a
2017-05-15 2017-03-31 13F MERCK COM Call 189,500 39.03 12,040 50.07 n/a n/a n/a
2017-02-13 2016-12-31 13F MERCK COM Call 136,300 -28.07 8,023 -33.36 n/a n/a n/a
2016-11-14 2016-09-30 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2016-08-25 2016-06-30 13F/A MERCK COM Call 14,100 812 n/a n/a n/a
2016-08-15 2016-06-30 13F MERCK COM Call 14,100 812 n/a n/a n/a
2016-05-16 2016-03-31 13F MERCK & CO INC COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2016-02-12 2015-12-31 13F MERCK & CO INC COM Call 2,516 65.96 5 -89.13 n/a n/a n/a
2015-11-17 2015-09-30 13F MERCK & CO INC COM Call 1,516 9,375.00 46 820.00 n/a n/a n/a
2015-08-14 2015-06-30 13F MERCK & CO INC COM Call 16 0.00 0 -100.00 n/a n/a n/a
2015-05-15 2015-03-31 13F MERCK & CO INC COM Call 16 -95.43 1 -93.75 n/a n/a n/a
2015-02-12 2014-12-31 13F MERCK & CO INC COM Call 350 -52.45 16 -95.17 n/a n/a n/a
2014-11-13 2014-09-30 13F MERCK & CO INC COM Call 736 -19.65 331 -2.07 n/a n/a n/a
2014-08-13 2014-06-30 13F MERCK & CO INC COM Call 916 147.57 338 103.61 n/a n/a n/a
2014-05-14 2014-03-31 13F MERCK & CO INC COM Call 370 56.78 166 137.14 n/a n/a n/a
2014-02-14 2013-12-31 13F MERCK & CO INC COM Call 236 120.56 70 250.00 n/a n/a n/a
2013-11-13 2013-09-30 13F MERCK & CO INC COM Call 107 -52.86 20 -39.39 n/a n/a n/a
2013-08-01 2013-06-30 13F MERCK & CO INC COM Call 227 33 n/a n/a n/a
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
(%)
2026-05-04 2026-03-31 13F MERCK COM Put 110,200 -27.83 13,256 -17.53 n/a n/a n/a
2026-02-02 2025-12-31 13F MERCK COM Put 152,700 -6.95 16,073 16.71 n/a n/a n/a
2025-10-28 2025-09-30 13F MERCK COM Put 164,100 28.00 13,773 35.71 n/a n/a n/a
2025-08-04 2025-06-30 13F MERCK COM Put 128,200 124.91 10,148 98.36 n/a n/a n/a
2025-05-12 2025-03-31 13F MERCK COM Put 57,000 77.02 5,116 59.73 n/a n/a n/a
2025-02-03 2024-12-31 13F MERCK COM Put 32,200 -33.74 3,203 -41.96 n/a n/a n/a
2024-11-04 2024-09-30 13F MERCK COM Put 48,600 -42.14 5,519 -46.93 n/a n/a n/a
2024-08-01 2024-06-30 13F MERCK COM Put 84,000 -61.94 10,399 -64.29 n/a n/a n/a
2024-05-13 2024-03-31 13F MERCK COM Put 220,700 10.85 29,121 34.17 n/a n/a n/a
2024-02-01 2023-12-31 13F MERCK COM Put 199,100 63.20 21,706 72.82 n/a n/a n/a
2023-11-13 2023-09-30 13F MERCK COM Put 122,000 19.37 12,560 6.50 n/a n/a n/a
2023-08-07 2023-06-30 13F MERCK COM Put 102,200 -77.27 11,793 -75.35 n/a n/a n/a
2023-05-08 2023-03-31 13F MERCK COM Put 449,600 38.68 47,833 32.98 n/a n/a n/a
2023-02-01 2022-12-31 13F MERCK COM Put 324,200 70.01 35,970 119.02 n/a n/a n/a
2022-11-10 2022-09-30 13F MERCK COM Put 190,700 131.15 16,423 118.36 n/a n/a n/a
2022-08-03 2022-06-30 13F MERCK COM Put 82,500 7,521 n/a n/a n/a
2019-05-15 2019-03-31 13F MERCK COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-02-14 2018-12-31 13F MERCK COM Put 10,800 0.00 825 7.70 n/a n/a n/a
2018-11-14 2018-09-30 13F MERCK COM Put 10,800 0.00 766 16.95 n/a n/a n/a
2018-08-14 2018-06-30 13F MERCK COM Put 10,800 -81.97 655 -79.92 n/a n/a n/a
2018-05-15 2018-03-31 13F MERCK COM Put 59,900 -65.67 3,262 -66.78 n/a n/a n/a
2018-02-14 2017-12-31 13F MERCK COM Put 174,500 37.08 9,819 20.46 n/a n/a n/a
2017-11-14 2017-09-30 13F MERCK COM Put 127,300 -35.45 8,151 -35.50 n/a n/a n/a
2017-08-14 2017-06-30 13F MERCK COM Put 197,200 3.57 12,638 4.46 n/a n/a n/a
2017-05-15 2017-03-31 13F MERCK COM Put 190,400 -31.04 12,098 -25.57 n/a n/a n/a
2017-02-13 2016-12-31 13F MERCK COM Put 276,100 45.01 16,254 34.35 n/a n/a n/a
2016-05-16 2016-03-31 13F MERCK & CO INC COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2016-02-12 2015-12-31 13F MERCK & CO INC COM Put 367 -43.01 61 -79.87 n/a n/a n/a
2015-11-17 2015-09-30 13F MERCK & CO INC COM Put 644 -41.13 303 95.48 n/a n/a n/a
2015-08-14 2015-06-30 13F MERCK & CO INC COM Put 1,094 0.00 155 -20.92 n/a n/a n/a
2015-05-15 2015-03-31 13F MERCK & CO INC COM Put 1,094 -25.07 196 -23.44 n/a n/a n/a
2015-02-12 2014-12-31 13F MERCK & CO INC COM Put 1,460 -12.94 256 -4.12 n/a n/a n/a
2014-11-13 2014-09-30 13F MERCK & CO INC COM Put 1,677 2.01 267 -17.34 n/a n/a n/a
2014-08-13 2014-06-30 13F MERCK & CO INC COM Put 1,644 134.86 323 107.05 n/a n/a n/a
2014-05-14 2014-03-31 13F MERCK & CO INC COM Put 700 -16.37 156 -21.21 n/a n/a n/a
2014-02-14 2013-12-31 13F MERCK & CO INC COM Put 837 11.16 198 -17.84 n/a n/a n/a
2013-11-13 2013-09-30 13F MERCK & CO INC COM Put 753 -14.33 241 -28.27 n/a n/a n/a
2013-08-01 2013-06-30 13F MERCK & CO INC COM Put 879 336 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.