Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionNomura Holdings Inc
Latest Disclosed Ownership35,919 shares
Latest Disclosed Value $ 4,320,697
Nomura Holdings Inc ownership in MRK / Merck & Co., Inc.

On May 15, 2026 - Nomura Holdings Inc filed a 13F-HR form disclosing ownership of 35,919 shares of Merck & Co., Inc. (MX:MRK) valued at $4,320,697 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 116,312 shares of Merck & Co., Inc.. This represents a change in shares of -69.12% during the quarter.

Nomura Holdings Inc 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 and put options representing 3,700 of underlying shares valued at $445,073 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)
2026-05-15 2026-03-31 13F MERCK COM 58933Y105 35,919 -80,393 -69.12 4,321 -64.71 0.0088
2026-02-17 2025-12-31 13F MERCK COM 58933Y105 116,312 -35,417 -23.34 12,243 -3.86 0.0163
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 151,729 37,843 33.23 12,735 41.25 0.0197
2025-08-18 2025-06-30 13F/A-1 MERCK COM 58933Y105 113,886 8,480 8.05 9,015 -4.71 0.0188
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 117,385 11,979 9,292 0.0117
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 105,406 -30,694 -22.55 9,461 -30.12 0.0177
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 136,100 95,812 237.82 13,539 195.93 0.0183
2025-01-13 2024-09-30 13F/A-1 MERCK COM 58933Y105 40,288 -21,817 -35.13 4,575 -40.49 0.0105
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 40,288 -21,817 4,575 0.0076
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 62,105 5,018 8.79 7,689 2.07 0.0147
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 57,087 -1,210 -2.08 7,533 18.52 0.0188
2024-03-27 2023-12-31 13F/A-1 MERCK COM 58933Y105 58,297 58,297 6,356 0.0172
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 58,297 58,297 6,356 0.0131
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 0 -70,889 -100.00 0 -100.00
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 70,889 70,889 8,180 0.0221
2023-05-15 2023-03-31 13F MERCK CMN 58933Y105 0 -1,142 -100.00 0 0.0000
2023-02-15 2022-12-31 13F/A-1 MERCK CMN 58933Y105 1,142 -23,797 -95.42 0 -100.00 0.0005
2023-02-14 2022-12-31 13F MERCK CMN 58933Y105 1,142 -23,797 0 0.0006
2022-11-15 2022-09-30 13F MERCK CMN 58933Y105 24,939 -448,874 -94.74 2,178 -95.02 0.0089
2022-08-17 2022-06-30 13F/A-1 MERCK CMN 58933Y105 473,813 381,108 411.10 43,772 460.75 0.1508
2022-08-15 2022-06-30 13F MERCK CMN 58933Y105 473,813 381,108 43,772 0.1220
2022-05-18 2022-03-31 13F MERCK CMN 58933Y105 92,705 78,160 537.37 7,806 582.34 0.0234
2022-02-14 2021-12-31 13F MERCK CMN 58933Y105 14,545 -6,106 -29.57 1,144 -31.29 0.0029
2021-11-15 2021-09-30 13F MERCK CMN 58933Y105 20,651 -40,854 -66.42 1,665 -64.98 0.0041
2021-08-16 2021-06-30 13F MERCK CMN 58933Y105 61,505 40,437 191.94 4,755 475,400.00 0.0121
2021-05-17 2021-03-31 13F MERCK CMN 58933Y105 21,068 -580,258 -96.50 2 -97.92 0.0037
2021-02-16 2020-12-31 13F MERCK CMN 58933Y105 601,326 363,218 152.54 49 -99.76 0.0819
2020-11-12 2020-09-30 13F MERCK CMN 58933Y105 238,108 158,993 200.96 19,612 222.19 0.0430
2020-08-14 2020-06-30 13F MERCK CMN 58933Y105 79,115 26,574 50.58 6,087 52.25 0.0212
2020-05-15 2020-03-31 13F/A-1 MERCK CMN 58933Y105 52,541 -505,726 -90.59 3,998 -92.00 0.0168
2020-02-14 2019-12-31 13F MERCK CMN 58933Y105 558,267 -243,638 -30.38 49,993 -25.54 0.1854
2019-11-14 2019-09-30 13F MERCK CMN 58933Y105 801,905 579,388 260.38 67,143 256.73 0.2557
2019-08-23 2019-06-30 13F/A-1 MERCK CMN 58933Y105 222,517 166,609 298.01 18,822 312.22 0.0833
2019-08-14 2019-06-30 13F MERCK CMN 58933Y105 222,517 166,609 18,822
2019-05-14 2019-03-31 13F MERCK CMN 58933Y105 55,908 42,520 317.60 4,566 352.53 0.0193
2019-02-14 2018-12-31 13F MERCK CMN 58933Y105 13,388 -565,165 -97.69 1,009 -97.55 0.0038
2018-11-14 2018-09-30 13F MERCK CMN 58933Y105 578,553 154,759 36.52 41,227 60.26 0.1446
2018-08-17 2018-06-30 13F/A-1 MERCK CMN 58933Y105 423,794 -1,262,681 -74.87 25,725 -72.01 0.0819
2018-08-14 2018-06-30 13F MERCK CMN 58933Y105 423,794 -1,262,681 18,721
2018-05-14 2018-03-31 13F/A-1 MERCK CMN 58933Y105 1,686,475 979,923 138.69 91,918 56.98 0.1584
2018-05-14 2018-03-31 13F MERCK CMN 58933Y105 2,393,027 150,472
2018-02-14 2017-12-31 13F MERCK CMN 58933Y105 706,552 47,884 7.27 58,554 38.60 0.1041
2017-11-14 2017-09-30 13F MERCK CMN 58933Y105 658,668 302,375 84.87 42,247 85.39 0.0889
2017-08-15 2017-06-30 13F MERCK CMN 58933Y105 356,293 211,671 146.36 22,788 148.15 0.0557
2017-05-18 2017-03-31 13F/A-1 MERCK CMN 58933Y105 144,622 -139,051 -49.02 9,183 -45.75 0.0239
2017-05-15 2017-03-31 13F MERCK CMN 58933Y105 144,622 9,183
2017-02-13 2016-12-31 13F MERCK CMN 58933Y105 283,673 248,586 708.48 16,928 672.97 0.0430
2016-11-14 2016-09-30 13F MERCK CMN 58933Y105 35,087 -6,883 -16.40 2,190 -8.83 0.0061
2016-09-02 2016-06-30 13F/A-1 MERCK CMN 58933Y105 41,970 -174,297 -80.59 2,402 -79.04 0.0078
2016-08-15 2016-06-30 13F MERCK CMN 58933Y105 41,970 2,402
2016-05-16 2016-03-31 13F MERCK CMN 58933Y105 216,267 119,877 124.37 11,460 125.77 0.0388
2016-02-12 2015-12-31 13F MERCK CMN 58933Y105 96,390 18,885 24.37 5,076 31.47 0.0142
2015-11-16 2015-09-30 13F MERCK CMN 58933Y105 77,505 24,717 46.82 3,861 27.55 0.0138
2015-08-14 2015-06-30 13F MERCK CMN 58933Y105 52,788 -40,438 -43.38 3,027 -43.77 0.0085
2015-05-15 2015-03-31 13F MERCK CMN 58933Y105 93,226 -179,244 -65.78 5,383 -65.36 0.0176
2015-02-17 2014-12-31 13F MERCK CMN 58933Y105 272,470 205,406 306.28 15,538 294.47 0.0416
2014-11-14 2014-09-30 13F MERCK CMN 58933Y105 67,064 1,605 2.45 3,939 4.43 0.0107
2014-08-13 2014-06-30 13F MERCK CMN 58933Y105 65,459 -467,004 -87.71 3,772 -87.48 0.0011
2014-05-14 2014-03-31 13F MERCK CMN 58933Y105 532,463 180,308 51.20 30,116 71.66 0.0093
2014-02-14 2013-12-31 13F MERCK CMN 58933Y105 352,155 -662,575 -65.30 17,544 -63.76 0.0802
2013-11-14 2013-09-30 13F MERCK CMN 58933Y105 1,014,730 673,517 197.39 48,406 203.71 0.2912
2013-08-15 2013-06-30 13F MERCK CMN 58933Y105 341,213 12,063 3.66 15,938 9.63 0.1295
2013-08-16 2013-03-31 13F/A-2 MERCK CMN 58933Y105 329,150 108,649 49.27 14,538 61.10 0.1535
2013-08-16 2012-12-31 13F/A-1 MERCK CMN 58933Y105 220,501 220,501 9,024 0.1005
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
(%)
2026-05-15 2026-03-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-17 2025-12-31 13F MERCK COM Call 4,300 -85.32 453 -81.62 n/a n/a n/a
2025-11-14 2025-09-30 13F MERCK COM Call 29,300 2,459 n/a n/a n/a
2025-02-14 2024-12-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-01-13 2024-09-30 13F/A MERCK COM Call 251,800 28,594 n/a n/a n/a
2024-11-14 2024-09-30 13F MERCK COM Call 251,800 28,594 n/a n/a n/a
2024-05-15 2024-03-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-03-27 2023-12-31 13F/A MERCK COM Call 100,000 211.53 10,902 229.96 n/a n/a n/a
2024-02-14 2023-12-31 13F MERCK COM Call 100,000 10,902 n/a n/a n/a
2023-11-14 2023-09-30 13F MERCK COM Call 32,100 3,305 n/a n/a n/a
2023-08-14 2023-06-30 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-05-15 2023-03-31 13F MERCK COM Call 112,200 43.11 11,937 149,100.00 n/a n/a n/a
2023-02-15 2022-12-31 13F/A MERCK CMN Call 78,400 2,077.78 9 -97.45 n/a n/a n/a
2023-02-14 2022-12-31 13F MERCK CMN Call 78,400 9 n/a n/a n/a
2022-11-15 2022-09-30 13F MERCK CMN Call 3,600 -98.69 314 -98.76 n/a n/a n/a
2022-08-17 2022-06-30 13F/A MERCK CMN Call 275,200 1,387.57 25,424 1,531.84 n/a n/a n/a
2022-08-15 2022-06-30 13F MERCK CMN Call 275,200 25,424 n/a n/a n/a
2022-05-18 2022-03-31 13F MERCK CMN Call 18,500 1,558 n/a n/a n/a
2019-08-14 2019-06-30 13F MERCK CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-05-14 2019-03-31 13F MERCK CMN Call 115,000 9,392 n/a n/a n/a
2019-02-14 2018-12-31 13F MERCK CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-11-14 2018-09-30 13F MERCK CMN Call 1,330,900 94,839 n/a n/a n/a
2018-08-17 2018-06-30 13F/A MERCK CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-05-14 2018-03-31 13F/A MERCK CMN Call 39,900 478.26 2,175 280.24 n/a n/a n/a
2018-05-14 2018-03-31 13F MERCK CMN Call 46,800 2,747 n/a n/a n/a
2018-02-14 2017-12-31 13F MERCK CMN Call 6,900 -80.29 572 -74.52 n/a n/a n/a
2017-11-14 2017-09-30 13F MERCK CMN Call 35,000 0.00 2,245 0.27 n/a n/a n/a
2017-08-15 2017-06-30 13F MERCK CMN Call 35,000 2,239 n/a n/a n/a
2017-02-13 2016-12-31 13F MERCK CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2016-11-14 2016-09-30 13F MERCK CMN Call 118,500 7,398 n/a n/a n/a
2015-11-16 2015-09-30 13F MERCK CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2015-08-14 2015-06-30 13F MERCK CMN Call 39,900 -65.90 2,287 -66.14 n/a n/a n/a
2015-05-15 2015-03-31 13F MERCK CMN Call 117,000 142.24 6,755 145.28 n/a n/a n/a
2015-02-17 2014-12-31 13F MERCK CMN Call 48,300 0.00 2,754 -2.93 n/a n/a n/a
2014-11-14 2014-09-30 13F MERCK CMN Call 48,300 -62.73 2,837 -62.01 n/a n/a n/a
2014-08-13 2014-06-30 13F MERCK CMN Call 129,600 -64.03 7,468 -63.35 n/a n/a n/a
2014-05-14 2014-03-31 13F MERCK CMN Call 360,300 -92.82 20,378 -91.30 n/a n/a n/a
2013-11-14 2013-09-30 13F MERCK CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2013-08-15 2013-06-30 13F MERCK CMN Call 5,015,800 234,299 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
(%)
2026-05-15 2026-03-31 13F MERCK COM Put 3,700 445 n/a n/a n/a
2026-02-17 2025-12-31 13F MERCK COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-14 2025-09-30 13F MERCK COM Put 85,000 142.86 7,134 157.55 n/a n/a n/a
2025-08-18 2025-06-30 13F/A MERCK COM Put 35,000 2,771 n/a n/a n/a
2025-08-14 2025-06-30 13F MERCK COM Put 35,000 2,771 n/a n/a n/a
2023-11-14 2023-09-30 13F MERCK COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-08-14 2023-06-30 13F MERCK COM Put 187,000 21,578 n/a n/a n/a
2019-08-14 2019-06-30 13F MERCK CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-05-14 2019-03-31 13F MERCK CMN Put 115,000 9,392 n/a n/a n/a
2018-08-17 2018-06-30 13F/A MERCK CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2018-05-14 2018-03-31 13F MERCK CMN Put 173,500 0.00 14,379 0.00 n/a n/a n/a
2018-02-14 2017-12-31 13F MERCK CMN Put 173,500 0.00 14,379 29.21 n/a n/a n/a
2017-11-14 2017-09-30 13F MERCK CMN Put 173,500 -26.17 11,128 -25.97 n/a n/a n/a
2017-08-15 2017-06-30 13F MERCK CMN Put 235,000 17.50 15,031 18.35 n/a n/a n/a
2017-05-18 2017-03-31 13F/A MERCK CMN Put 200,000 -52.38 12,700 -49.33 n/a n/a n/a
2017-05-15 2017-03-31 13F MERCK CMN Put 200,000 12,700 n/a n/a n/a
2017-02-13 2016-12-31 13F MERCK CMN Put 420,000 0.00 25,064 -4.42 n/a n/a n/a
2016-11-14 2016-09-30 13F MERCK CMN Put 420,000 31.25 26,222 43.19 n/a n/a n/a
2016-09-02 2016-06-30 13F/A MERCK CMN Put 320,000 -28.09 18,313 -22.34 n/a n/a n/a
2016-08-15 2016-06-30 13F MERCK CMN Put 320,000 18,313 n/a n/a n/a
2016-05-16 2016-03-31 13F MERCK CMN Put 445,000 23,582 n/a n/a n/a
2015-05-15 2015-03-31 13F MERCK CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2015-02-17 2014-12-31 13F MERCK CMN Put 36,300 -11.25 2,070 -13.82 n/a n/a n/a
2014-11-14 2014-09-30 13F MERCK CMN Put 40,900 22.82 2,402 27.56 n/a n/a n/a
2014-05-14 2014-03-31 13F MERCK CMN Put 33,300 -91.62 1,883 -90.49 n/a n/a n/a
2014-02-14 2013-12-31 13F MERCK CMN Put 397,600 -71.05 19,808 -69.77 n/a n/a n/a
2013-11-14 2013-09-30 13F MERCK CMN Put 1,373,600 15.07 65,524 17.51 n/a n/a n/a
2013-08-15 2013-06-30 13F MERCK CMN Put 1,193,700 55,760 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.