Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCapital Fund Management S.a.
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Capital Fund Management S.a. ownership in MRK / Merck & Co., Inc.

On May 14, 2026 - Capital Fund Management S.a. filed a 13F-HR form disclosing ownership of 0 shares of Merck & Co., Inc. (MX:MRK) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 47,747 shares of Merck & Co., Inc..

Capital Fund Management S.a. 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 240,000 of underlying shares valued at $28,869,600 USD and put options representing 235,800 of underlying shares valued at $28,364,382 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)
2026-05-14 2026-03-31 13F MERCK & CO INC COM MERCK & CO INC COM 58933Y105 0 -100.00 0
2026-02-17 2025-12-31 13F MERCK & CO INC COM MERCK & CO INC COM 58933Y105 47,747 -485,603 -91.05 5,026 -88.77 0.0140
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 533,350 -420,203 -44.07 44,764 -40.70 0.1173
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 953,553 -443,352 -31.74 75,483 -39.80 0.2079
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 1,396,905 612,690 78.13 125,386 60.72 0.3617
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 784,215 -128,717 -14.10 78,014 -24.75 0.1990
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 912,932 788,335 632.71 103,673 572.10 0.2837
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 124,597 26,288 26.74 15,425 18.92 0.0454
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 98,309 98,309 12,972 0.0375
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 0 -123,270 -100.00 0 -100.00
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 123,270 123,270 12,691 0.0439
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 0 -295,467 -100.00 0 -100.00
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 295,467 237,111 406.32 32,782 552.38 0.2202
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 58,356 -318,098 -84.50 5,026 -85.36 0.0395
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 376,454 293,566 354.17 34,321 404.72 0.3121
2022-05-12 2022-03-31 13F MERCK COM 58933Y105 82,888 -6,731 -7.51 6,801 -0.99 0.0555
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 89,619 62,835 234.60 6,868 241.52 0.0495
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 26,784 -44,602 -62.48 2,012 -63.77 0.0149
2021-08-12 2021-06-30 13F MERCK COM 58933Y105 71,386 71,386 5,552 0.0439
2021-05-14 2021-03-31 13F MERCK & CO. COM 58933Y105 0 -16,876 -100.00 0 -100.00
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 16,876 -85,126 -83.46 1,380 -83.69 0.0130
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 102,002 -16,085 -13.62 8,461 -7.34 0.1045
2020-08-13 2020-06-30 13F MERCK & CO. COM 58933Y105 118,087 -717,335 -85.86 9,132 -85.79 0.1449
2020-05-13 2020-03-31 13F Merck COM 58933Y105 835,422 456,457 120.45 64,277 86.49 0.9944
2020-02-13 2019-12-31 13F Merck COM 58933Y105 378,965 145,201 62.11 34,467 75.15 0.2712
2019-11-13 2019-09-30 13F Merck COM 58933Y105 233,764 -629,436 -72.92 19,678 -72.81 0.1771
2019-08-12 2019-06-30 13F Merck COM 58933Y105 863,200 -36,526 -4.06 72,379 -3.28 0.6586
2019-05-13 2019-03-31 13F/A-1 Merck COM 58933Y105 899,726 799,200 795.02 74,830 874.22 0.6694
2019-05-13 2019-03-31 13F Merck COM 58933Y105 100,526 0 7,681
2019-02-13 2018-12-31 13F Merck COM 58933Y105 100,526 100,526 -88.83 7,681 -89.74 0.0680
2018-08-14 2018-06-30 13F Merck COM 58933Y105 0 -115,116 -100.00 0 -100.00
2018-05-15 2018-03-31 13F Merck COM 58933Y105 115,116 -963,302 -89.33 6,270 -89.67 0.0376
2018-02-09 2017-12-31 13F Merck COM 58933Y105 1,078,418 -385,700 -26.34 60,683 -35.27 0.3346
2017-11-13 2017-09-30 13F Merck COM 58933Y105 1,464,118 -363,300 -19.88 93,747 -19.96 0.6738
2017-08-10 2017-06-30 13F Merck COM 58933Y105 1,827,418 -139,000 -7.07 117,119 -6.26 0.9442
2017-05-03 2017-03-31 13F Merck COM 58933Y105 1,966,418 1,836,369 1,412.06 124,946 1,532.00 1.0419
2017-02-08 2016-12-31 13F Merck COM 58933Y105 130,049 123,443 1,868.65 7,656 1,758.25 0.0659
2016-10-31 2016-09-30 13F Merck COM 58933Y105 6,606 6,606 -94.92 412 -94.62 0.0038
2016-07-27 2016-06-30 13F Merck COM 58933Y105 0 -10,392 -100.00 0 -100.00
2016-05-02 2016-03-31 13F Merck COM 58933Y105 10,392 10,392 0.00 550 0.0053
2015-01-28 2014-12-31 13F Merck COM 58933Y105 0 -12,271 -100.00 0 -100.00
2014-10-31 2014-09-30 13F Merck COM 58933Y105 12,271 12,271 -88.92 727 -86.21 0.0081
2014-01-31 2013-12-31 13F Merck COM 58933Y105 0 -110,740 -100.00 0 -100.00
2013-10-31 2013-09-30 13F Merck COM 58933Y105 110,740 110,740 5,272 0.0729
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
(%)
2026-05-14 2026-03-31 13F MERCK & CO INC COM MERCK & CO INC COM Call 240,000 -2.16 28,870 11.81 n/a n/a n/a
2026-02-17 2025-12-31 13F MERCK & CO INC COM MERCK & CO INC COM Call 245,300 -77.28 25,820 -71.51 n/a n/a n/a
2025-11-13 2025-09-30 13F MERCK COM Call 1,079,700 2.00 90,619 8.15 n/a n/a n/a
2025-08-13 2025-06-30 13F MERCK COM Call 1,058,500 7.42 83,791 -5.27 n/a n/a n/a
2025-05-14 2025-03-31 13F MERCK COM Call 985,400 140.52 88,450 117.02 n/a n/a n/a
2025-02-13 2024-12-31 13F MERCK COM Call 409,700 802.42 40,757 690.61 n/a n/a n/a
2024-11-13 2024-09-30 13F MERCK COM Call 45,400 -32.84 5,156 -38.40 n/a n/a n/a
2024-08-13 2024-06-30 13F MERCK COM Call 67,600 51.57 8,369 42.22 n/a n/a n/a
2024-05-15 2024-03-31 13F MERCK COM Call 44,600 -44.32 5,885 -32.62 n/a n/a n/a
2024-02-14 2023-12-31 13F MERCK COM Call 80,100 -84.97 8,733 -84.08 n/a n/a n/a
2023-11-14 2023-09-30 13F MERCK COM Call 532,900 -30.18 54,862 -37.70 n/a n/a n/a
2023-08-14 2023-06-30 13F MERCK COM Call 763,200 -8.70 88,066 -0.97 n/a n/a n/a
2023-05-15 2023-03-31 13F MERCK COM Call 835,900 518.73 88,931 493.31 n/a n/a n/a
2023-02-13 2022-12-31 13F MERCK COM Call 135,100 -79.87 14,989 -74.07 n/a n/a n/a
2022-11-14 2022-09-30 13F MERCK COM Call 671,100 127.34 57,795 114.75 n/a n/a n/a
2022-08-12 2022-06-30 13F MERCK COM Call 295,200 121.95 26,913 146.64 n/a n/a n/a
2022-05-12 2022-03-31 13F MERCK COM Call 133,000 10,913 n/a n/a n/a
2021-11-12 2021-09-30 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-08-12 2021-06-30 13F MERCK COM Call 22,600 1,758 n/a n/a n/a
2021-05-14 2021-03-31 13F MERCK & CO. COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-12 2020-12-31 13F MERCK & CO. COM Call 35,200 175.00 2,879 171.35 n/a n/a n/a
2020-11-13 2020-09-30 13F MERCK & CO. COM Call 12,800 -63.64 1,062 -63.15 n/a n/a n/a
2020-08-13 2020-06-30 13F Merck COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-05-13 2020-03-31 13F Merck COM Call 66,200 2,351.85 5,093 1,970.33 n/a n/a n/a
2020-02-13 2019-12-31 13F Merck COM Call 2,700 -94.05 246 -93.56 n/a n/a n/a
2019-11-13 2019-09-30 13F Merck COM Call 45,400 -19.79 3,822 -19.47 n/a n/a n/a
2019-08-12 2019-06-30 13F Merck COM Call 56,600 -88.16 4,746 -88.06 n/a n/a n/a
2019-05-13 2019-03-31 13F/A Merck COM Call 478,000 -62.23 39,755 -58.89 n/a n/a n/a
2019-05-13 2019-03-31 13F Merck COM Call 1,265,700 96,712 n/a n/a n/a
2019-02-13 2018-12-31 13F Merck COM Call 1,265,700 -15.47 96,712 -8.95 n/a n/a n/a
2018-11-14 2018-09-30 13F Merck COM Call 1,497,300 11.46 106,218 30.26 n/a n/a n/a
2018-08-14 2018-06-30 13F Merck COM Call 1,343,400 214.76 81,544 250.76 n/a n/a n/a
2018-05-15 2018-03-31 13F Merck COM Call 426,800 -50.65 23,248 -52.23 n/a n/a n/a
2018-02-09 2017-12-31 13F Merck COM Call 864,900 7,983.18 48,668 7,004.82 n/a n/a n/a
2017-11-13 2017-09-30 13F Merck COM Call 10,700 0.00 685 -0.15 n/a n/a n/a
2017-08-10 2017-06-30 13F Merck COM Call 10,700 -86.35 686 -86.23 n/a n/a n/a
2017-05-03 2017-03-31 13F Merck COM Call 78,400 -76.02 4,982 -74.12 n/a n/a n/a
2017-02-08 2016-12-31 13F Merck COM Call 327,000 -9.69 19,250 -14.82 n/a n/a n/a
2016-10-31 2016-09-30 13F Merck COM Call 362,100 1,021.05 22,599 1,114.35 n/a n/a n/a
2016-07-27 2016-06-30 13F Merck COM Call 32,300 -91.08 1,861 -91.77 n/a n/a n/a
2016-05-02 2016-03-31 13F Merck COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2016-01-28 2015-12-31 13F Merck COM Call 258,400 63.86 13,649 75.23 n/a n/a n/a
2015-10-27 2015-09-30 13F Merck COM Call 157,700 340.50 7,789 282.19 n/a n/a n/a
2015-07-28 2015-06-30 13F Merck COM Call 35,800 -51.62 2,038 -52.09 n/a n/a n/a
2015-04-28 2015-03-31 13F Merck COM Call 74,000 106.70 4,254 108.73 n/a n/a n/a
2015-01-28 2014-12-31 13F Merck COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2014-10-31 2014-09-30 13F Merck COM Call 208,500 -55.25 12,360 -54.14 n/a n/a n/a
2014-08-01 2014-06-30 13F Merck COM Call 465,900 -16.60 26,952 -15.01 n/a n/a n/a
2014-05-14 2014-03-31 13F Merck COM Call 558,600 2,474.19 31,712 2,820.07 n/a n/a n/a
2014-01-31 2013-12-31 13F Merck COM Call 21,700 -79.19 1,086 -78.13 n/a n/a n/a
2013-10-31 2013-09-30 13F Merck COM Call 104,300 -73.50 4,966 -72.84 n/a n/a n/a
2013-07-31 2013-06-30 13F Merck COM Call 393,600 18,283 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
(%)
2026-05-14 2026-03-31 13F MERCK & CO INC COM MERCK & CO INC COM Put 235,800 -39.16 28,364 -30.48 n/a n/a n/a
2026-02-17 2025-12-31 13F MERCK & CO INC COM MERCK & CO INC COM Put 387,600 -54.76 40,799 -43.27 n/a n/a n/a
2025-11-13 2025-09-30 13F MERCK COM Put 856,800 -20.17 71,911 -15.36 n/a n/a n/a
2025-08-13 2025-06-30 13F MERCK COM Put 1,073,300 2.68 84,962 -9.45 n/a n/a n/a
2025-05-14 2025-03-31 13F MERCK COM Put 1,045,300 68.11 93,826 51.68 n/a n/a n/a
2025-02-13 2024-12-31 13F MERCK COM Put 621,800 369.99 61,857 311.74 n/a n/a n/a
2024-11-13 2024-09-30 13F MERCK COM Put 132,300 -13.42 15,024 -20.58 n/a n/a n/a
2024-08-13 2024-06-30 13F MERCK COM Put 152,800 9.93 18,917 3.14 n/a n/a n/a
2024-05-15 2024-03-31 13F MERCK COM Put 139,000 -22.13 18,341 -5.75 n/a n/a n/a
2024-02-14 2023-12-31 13F MERCK COM Put 178,500 -73.02 19,460 -71.43 n/a n/a n/a
2023-11-14 2023-09-30 13F MERCK COM Put 661,600 6.06 68,112 -5.38 n/a n/a n/a
2023-08-14 2023-06-30 13F MERCK COM Put 623,800 34.58 71,980 45.97 n/a n/a n/a
2023-05-15 2023-03-31 13F MERCK COM Put 463,500 108.22 49,312 99.66 n/a n/a n/a
2023-02-13 2022-12-31 13F MERCK COM Put 222,600 -57.76 24,697 -45.58 n/a n/a n/a
2022-11-14 2022-09-30 13F MERCK COM Put 527,000 90.39 45,385 79.85 n/a n/a n/a
2022-08-12 2022-06-30 13F MERCK COM Put 276,800 166.92 25,236 196.60 n/a n/a n/a
2022-05-12 2022-03-31 13F MERCK COM Put 103,700 8,509 n/a n/a n/a
2021-05-14 2021-03-31 13F MERCK & CO. COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-12 2020-12-31 13F MERCK & CO. COM Put 29,000 -57.91 2,372 -58.50 n/a n/a n/a
2020-11-13 2020-09-30 13F MERCK & CO. COM Put 68,900 137.59 5,715 140.94 n/a n/a n/a
2020-08-13 2020-06-30 13F Merck COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-05-13 2020-03-31 13F Merck COM Put 60,100 -34.17 4,624 -44.32 n/a n/a n/a
2020-02-13 2019-12-31 13F Merck COM Put 91,300 -3.49 8,304 4.28 n/a n/a n/a
2019-11-13 2019-09-30 13F Merck COM Put 94,600 -31.25 7,963 -30.98 n/a n/a n/a
2019-08-12 2019-06-30 13F Merck COM Put 137,600 -80.94 11,538 -80.78 n/a n/a n/a
2019-05-13 2019-03-31 13F/A Merck COM Put 721,900 -48.53 60,040 -43.98 n/a n/a n/a
2019-05-13 2019-03-31 13F Merck COM Put 1,402,700 107,180 n/a n/a n/a
2019-02-13 2018-12-31 13F Merck COM Put 1,402,700 -17.92 107,180 -11.59 n/a n/a n/a
2018-11-14 2018-09-30 13F Merck COM Put 1,709,000 32.28 121,236 54.59 n/a n/a n/a
2018-08-14 2018-06-30 13F Merck COM Put 1,292,000 97.55 78,424 120.15 n/a n/a n/a
2018-05-15 2018-03-31 13F Merck COM Put 654,000 -2.26 35,623 -5.38 n/a n/a n/a
2018-02-09 2017-12-31 13F Merck COM Put 669,100 12,767.31 37,650 11,206.31 n/a n/a n/a
2017-11-13 2017-09-30 13F Merck COM Put 5,200 0.00 333 0.00 n/a n/a n/a
2017-08-10 2017-06-30 13F Merck COM Put 5,200 -94.52 333 -94.48 n/a n/a n/a
2017-05-03 2017-03-31 13F Merck COM Put 94,900 -86.71 6,030 -85.66 n/a n/a n/a
2017-02-08 2016-12-31 13F Merck COM Put 714,100 -0.08 42,039 -5.75 n/a n/a n/a
2016-10-31 2016-09-30 13F Merck COM Put 714,700 2,002.06 44,604 2,176.88 n/a n/a n/a
2016-07-27 2016-06-30 13F Merck COM Put 34,000 304.76 1,959 341.22 n/a n/a n/a
2016-05-02 2016-03-31 13F Merck COM Put 8,400 -93.81 444 -93.81 n/a n/a n/a
2016-01-28 2015-12-31 13F Merck COM Put 135,700 254.31 7,168 278.86 n/a n/a n/a
2015-10-27 2015-09-30 13F Merck COM Put 38,300 350.59 1,892 290.91 n/a n/a n/a
2015-07-28 2015-06-30 13F Merck COM Put 8,500 -47.20 484 -47.68 n/a n/a n/a
2015-04-28 2015-03-31 13F Merck COM Put 16,100 89.41 925 91.12 n/a n/a n/a
2015-01-28 2014-12-31 13F Merck COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2014-10-31 2014-09-30 13F Merck COM Put 341,100 -46.41 20,220 -45.09 n/a n/a n/a
2014-08-01 2014-06-30 13F Merck COM Put 636,500 53.74 36,822 56.67 n/a n/a n/a
2014-05-14 2014-03-31 13F Merck COM Put 414,000 325.05 23,503 382.11 n/a n/a n/a
2014-01-31 2013-12-31 13F Merck COM Put 97,400 -49.69 4,875 -47.11 n/a n/a n/a
2013-10-31 2013-09-30 13F Merck COM Put 193,600 -12.71 9,217 -10.54 n/a n/a n/a
2013-07-31 2013-06-30 13F Merck COM Put 221,800 10,303 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.