Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionPenserra Capital Management LLC
Latest Disclosed Ownership1,753 shares
Latest Disclosed Value $ 209
Penserra Capital Management LLC ownership in MRK / Merck & Co., Inc.

On May 11, 2026 - Penserra Capital Management LLC filed a 13F-HR form disclosing ownership of 1,753 shares of Merck & Co., Inc. (MX:MRK) valued at $209 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 10,971 shares of Merck & Co., Inc.. This represents a change in shares of -84.02% during the quarter.

Penserra Capital 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)
2026-05-11 2026-03-31 13F MERCK COM 58933Y105 1,753 -9,218 -84.02 0 -100.00 0.0025
2026-02-12 2025-12-31 13F MERCK COM 58933Y105 10,971 9,000 456.62 1 0.0137
2025-11-04 2025-09-30 13F MERCK COM 58933Y105 1,971 105 5.63 0 0.0020
2025-08-06 2025-06-30 13F MERCK COM 58933Y105 1,866 -355 -15.98 0 0.0021
2025-04-29 2025-03-31 13F MERCK COM 58933Y105 2,221 -6,314 -73.98 0 0.0035
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 8,535 6,344 289.55 1 0.0155
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 2,191 -1,012,227 -99.78 0 -100.00 0.0054
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 1,014,418 228,418 29.06 126 21.36 1.5898
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 786,000 -87,295 -10.00 104 8.42 1.3023
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 873,295 -218,074 -19.98 95 -15.18 1.7896
2023-11-15 2023-09-30 13F MERCK COM 58933Y105 1,091,369 -144,292 -11.68 112 -21.13 2.3198
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 1,235,661 468,262 61.02 143 75.31 2.8217
2023-04-24 2023-03-31 13F MERCK COM 58933Y105 767,399 -460,813 -37.52 82 -40.44 1.6937
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 1,228,212 238,981 24.16 136 -99.84 2.9909
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 989,231 291,569 41.79 85,191 33.94 2.4157
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 697,662 381,079 120.37 63,605 144.87 1.7316
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 316,583 316,583 25,975 0.6173
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 0 -38,463 -100.00 0 -100.00
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 38,463 22,601 142.49 3,189 160.11 0.1213
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 15,862 -1,850 -10.44 1,226 -9.99 0.0632
2020-05-14 2020-03-31 13F MERCK & CO. COM 58933Y105 17,712 -16,624 -48.42 1,362 -56.36 0.0926
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 34,336 11,425 49.87 3,121 62.05 0.2017
2019-11-15 2019-09-30 13F MERCK COM 58933Y105 22,911 -4,523 -16.49 1,926 -16.22 0.1636
2019-08-13 2019-06-30 13F MERCK INC COM 58933Y105 27,434 1,308 5.01 2,299 11.87 0.1789
2019-05-08 2019-03-31 13F MERCK COM 58933Y105 26,126 8,562 48.75 2,055 53.13 0.1645
2019-02-06 2018-12-31 13F MERCK COM 58933Y105 17,564 17,564 1,342 0.1304
2017-10-26 2017-09-30 13F MERCK COM 58933Y105 0 -7,285 -100.00 0 -100.00
2017-08-21 2017-06-30 13F/A-2 MERCK COM 58933Y105 7,285 3,625 99.04 466 100.86 0.1688
2017-08-21 2017-06-30 13F/A-1 MERCK COM 58933Y105 7,285 0 466 0.1922
2017-08-07 2017-06-30 13F MERCK COM 58933Y105 7,285 3,625 466
2017-05-09 2017-03-31 13F MERCK COM 58933Y105 3,660 2,440 200.00 232 226.76 0.0240
2017-02-10 2016-12-31 13F MERCK & CO INC COM COM 58933Y105 1,220 1,220 71 0.0081
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
(%)
2024-11-12 2024-09-30 13F MERCK CALL Call 0 -100.00 0 n/a n/a n/a
2024-08-13 2024-06-30 13F MERCK CALL Call 2,000 0 n/a n/a n/a
2024-02-14 2023-12-31 13F MERCK CALL Call 0 -100.00 0 n/a n/a n/a
2023-11-15 2023-09-30 13F MERCK CALL Call 5,500 0 n/a n/a n/a
2023-04-24 2023-03-31 13F MERCK CALL Call 0 -100.00 0 n/a n/a n/a
2023-02-13 2022-12-31 13F MERCK CALL Call 8,000 0 n/a n/a n/a
2020-02-14 2019-12-31 13F MERCK CALL Call 0 -100.00 0 n/a n/a n/a
2019-11-15 2019-09-30 13F MERCK CALL Call 74 0 n/a n/a n/a
2017-10-26 2017-09-30 13F MERCK CALL Call 0 -100.00 0 n/a n/a n/a
2017-08-21 2017-06-30 13F/A MERCK CALL Call 36 0 n/a n/a n/a
2017-08-21 2017-06-30 13F/A MERCK CALL Call 36 0 n/a n/a n/a
2017-08-07 2017-06-30 13F MERCK CALL Call 36 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.