Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionHrt Financial Lp
Latest Disclosed Ownership113,100 shares
Latest Disclosed Value $ 13,604
Hrt Financial Lp ownership in MRK / Merck & Co., Inc.

On May 14, 2026 - Hrt Financial Lp filed a 13F-HR form disclosing ownership of 113,100 shares of Merck & Co., Inc. (MX:MRK) valued at $13,604 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 80,000 shares of Merck & Co., Inc.. This represents a change in shares of 41.38% during the quarter.

Hrt Financial Lp 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 79,400 of underlying shares valued at $9,551 USD and put options representing 113,100 of underlying shares valued at $13,604 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 PUT 58933Y955 113,100 33,100 41.38 14 62.50 0.0340
2026-05-14 2026-03-31 13F MERCK CALL 58933Y905 79,400 -48,100 -37.73 10 -10.00 0.0238
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 142,729 142,729 17 0.0424
2026-02-12 2025-12-31 13F MERCK PUT 58933Y955 80,000 34,100 74.29 8 166.67 0.0266
2026-02-12 2025-12-31 13F MERCK COM 58933Y105 612,756 64
2025-11-14 2025-09-30 13F MERCK CALL 58933Y905 127,500 100,600 373.98 11 400.00 0.0393
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 258,059 22
2025-08-14 2025-06-30 13F MERCK PUT 58933Y955 45,900 -200 -0.43 4 -25.00 0.0160
2025-08-14 2025-06-30 13F MERCK CALL 58933Y905 26,900 6,000 28.71 2 0.00 0.0094
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 1,114,453 88
2025-05-15 2025-03-31 13F MERCK PUT 58933Y955 46,100 3,900 9.24 4 0.00 0.0262
2025-02-14 2024-12-31 13F MERCK PUT 58933Y955 42,200 -13,000 -23.55 4 -33.33 0.0217
2025-02-14 2024-12-31 13F MERCK CALL 58933Y905 20,900 20,900 2 0.0107
2024-11-12 2024-09-30 13F MERCK CALL 58933Y905 0 -10,600 -100.00 0 -100.00
2024-08-12 2024-06-30 13F MERCK PUT 58933Y955 55,200 51,600 1,433.33 7 -97.12 0.0383
2024-08-12 2024-06-30 13F MERCK CALL 58933Y905 10,600 700 7.07 1 -99.87 0.0074
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 1,577,992 1,574,392 43,733.11 208 1.2801
2024-02-09 2023-12-31 13F MERCK PUT 58933Y955 3,600 -5,700 -61.29 0 0.0029
2024-02-09 2023-12-31 13F MERCK COM 58933Y105 17,434 2
2023-11-13 2023-09-30 13F MERCK PUT 58933Y955 9,300 9,300 1 0.0095
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 76,301 8
2023-08-11 2023-06-30 13F MERCK PUT 58933Y955 0 -2,700 -100.00 0 0.0000
2023-05-12 2023-03-31 13F MERCK PUT 58933Y955 2,700 -2,700 -50.00 0 0.0035
2023-02-10 2022-12-31 13F MERCK PUT 58933Y955 5,400 1,700 45.95 1 -100.00 0.0085
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 125,003 14
2022-11-14 2022-09-30 13F MERCK PUT 58933Y955 3,700 100 2.78 318 15.64 0.0034
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 0 -54,861 -100.00 0 -100.00
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 54,861 51,261 1,423.92 4,501 1,536.73 0.0321
2022-02-14 2021-12-31 13F MERCK PUT 58933Y955 3,600 3,600 -99.80 275 -99.80 0.0016
2022-02-14 2021-12-31 13F MERCK CALL 58933Y905 9,900 9,900 758 0.0044
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 1,788,807 1,058,446 144.92 134,357 136.54 0.8191
2021-08-16 2021-06-30 13F MERCK OM 58933Y105 730,361 730,361 56,800 0.5209
2021-05-17 2021-03-31 13F MERCK & CO. OM 58933Y105 0 -85,616 -100.00 0 -100.00
2021-02-16 2020-12-31 13F MERCK & CO. OM 58933Y105 85,616 85,616 7,003 0.1411
2020-11-13 2020-09-30 13F MERCK & CO. PUT 58933Y955 0 -8,100 -100.00 0 -100.00
2020-08-14 2020-06-30 13F MERCK & CO. PUT 58933Y955 8,100 5,100 170.00 626 172.17 0.0188
2020-05-15 2020-03-31 13F MERCK & CO. PUT 58933Y955 3,000 3,000 230 0.0148
2020-02-14 2019-12-31 13F MERCK PUT 58933Y955 0 -33,600 -100.00 0 -100.00
2019-11-14 2019-09-30 13F MERCK PUT 58933Y955 33,600 10,200 43.59 2,828 44.14 0.1335
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 27,330 3,930 2,300 0.1086
2019-08-14 2019-06-30 13F MERCK PUT 58933Y955 23,400 23,400 1,962 0.1239
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 0 -138,569 -100.00 0 -100.00
2019-02-15 2018-12-31 13F MERCK COM 58933Y105 138,569 138,569 10,588 1.5132
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 0 -16,397 -100.00 0 -100.00
2018-02-12 2017-12-31 13F MERCK COM 58933Y105 16,397 16,397 922 0.9395
2017-08-09 2017-06-30 13F MERCK COM 58933Y105 0 -4,422 -100.00 0 -100.00
2017-05-11 2017-03-31 13F MERCK COM 58933Y105 4,422 4,422 280 0.2613
2017-02-13 2016-12-31 13F MERCK COM 58933Y105 0 -3,470 -100.00 0 -100.00
2016-11-09 2016-09-30 13F MERCK COM 58933Y105 3,470 -327 -8.61 216 -0.92 0.1902
2016-08-10 2016-06-30 13F MERCK COM 58933Y105 3,797 3,797 9.42 218 0.93 0.1324
2015-08-13 2015-06-30 13F MERCK & CO INC COM 58933Y105 0 -4,925 -100.00 0 -100.00
2015-05-13 2015-03-31 13F MERCK & CO INC COM 58933Y105 4,925 -3,305 -40.16 283 -39.40 0.3623
2015-02-10 2014-12-31 13F MERCK & CO INC COM 58933Y105 8,230 8,230 467 0.6570
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 CALL 79,400 -37.73 10 -10.00 n/a n/a n/a
2025-11-14 2025-09-30 13F MERCK CALL 127,500 373.98 11 400.00 n/a n/a n/a
2025-08-14 2025-06-30 13F MERCK CALL 26,900 28.71 2 0.00 n/a n/a n/a
2025-02-14 2024-12-31 13F MERCK CALL 20,900 2 n/a n/a n/a
2024-11-12 2024-09-30 13F MERCK CALL 0 -100.00 0 -100.00 n/a n/a n/a
2024-08-12 2024-06-30 13F MERCK CALL 10,600 7.07 1 -99.87 n/a n/a n/a
2022-02-14 2021-12-31 13F MERCK CALL 9,900 758 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 PUT 113,100 41.38 14 62.50 n/a n/a n/a
2026-02-12 2025-12-31 13F MERCK PUT 80,000 74.29 8 166.67 n/a n/a n/a
2025-08-14 2025-06-30 13F MERCK PUT 45,900 -0.43 4 -25.00 n/a n/a n/a
2025-05-15 2025-03-31 13F MERCK PUT 46,100 9.24 4 0.00 n/a n/a n/a
2025-02-14 2024-12-31 13F MERCK PUT 42,200 -23.55 4 -33.33 n/a n/a n/a
2024-08-12 2024-06-30 13F MERCK PUT 55,200 1,433.33 7 -97.12 n/a n/a n/a
2024-02-09 2023-12-31 13F MERCK PUT 3,600 -61.29 0 n/a n/a n/a
2023-11-13 2023-09-30 13F MERCK PUT 9,300 1 n/a n/a n/a
2023-08-11 2023-06-30 13F MERCK PUT 0 -100.00 0 n/a n/a n/a
2023-05-12 2023-03-31 13F MERCK PUT 2,700 -50.00 0 n/a n/a n/a
2023-02-10 2022-12-31 13F MERCK PUT 5,400 45.95 1 -100.00 n/a n/a n/a
2022-11-14 2022-09-30 13F MERCK PUT 3,700 2.78 318 15.64 n/a n/a n/a
2022-02-14 2021-12-31 13F MERCK PUT 3,600 -99.80 275 -99.80 n/a n/a n/a
2020-11-13 2020-09-30 13F MERCK & CO. PUT 0 -100.00 0 -100.00 n/a n/a n/a
2020-08-14 2020-06-30 13F MERCK & CO. PUT 8,100 170.00 626 172.17 n/a n/a n/a
2020-05-15 2020-03-31 13F MERCK & CO. PUT 3,000 230 n/a n/a n/a
2020-02-14 2019-12-31 13F MERCK PUT 0 -100.00 0 -100.00 n/a n/a n/a
2019-11-14 2019-09-30 13F MERCK PUT 33,600 43.59 2,828 44.14 n/a n/a n/a
2019-08-14 2019-06-30 13F MERCK PUT 23,400 1,962 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.