Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionVontobel Holding Ltd.
Latest Disclosed Ownership387,524 shares
Latest Disclosed Value $ 46,615,263
Vontobel Holding Ltd. ownership in MRK / Merck & Co., Inc.

On May 8, 2026 - Vontobel Holding Ltd. filed a 13F-HR form disclosing ownership of 387,524 shares of Merck & Co., Inc. (MX:MRK) valued at $46,615,263 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 432,903 shares of Merck & Co., Inc.. This represents a change in shares of -10.48% during the quarter.

Vontobel Holding Ltd. 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)
2026-05-08 2026-03-31 13F MERCK COM 58933Y105 387,524 -45,379 -10.48 46,615 2.30 0.1603
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 432,903 34,451 8.65 45,567 36.26 0.1435
2025-10-15 2025-09-30 13F MERCK COM 58933Y105 398,452 16,386 4.29 33,442 10.57 0.1010
2025-07-23 2025-06-30 13F MERCK COM 58933Y105 382,066 37,364 10.84 30,244 -2.25 0.0964
2025-04-28 2025-03-31 13F MERCK COM 58933Y105 344,702 -7,744 -2.20 30,940 -11.75 0.1128
2025-01-30 2024-12-31 13F MERCK COM 58933Y105 352,446 -118,781 -25.21 35,061 -34.48 0.1200
2024-10-16 2024-09-30 13F MERCK COM 58933Y105 471,227 -36,292 -7.15 53,513 -14.83 0.1727
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 507,519 -72,888 -12.56 62,831 -17.96 0.2041
2024-05-10 2024-03-31 13F MERCK COM 58933Y105 580,407 -32,353 -5.28 76,585 14.64 0.6123
2024-06-04 2023-12-31 13F/A-1 MERCK COM 58933Y105 612,760 -17,429 -2.77 66,803 2.97 0.5595
2024-01-30 2023-12-31 13F MERCK COM 58933Y105 924,099 -26,696 100,745 0.5059
2024-06-04 2023-09-30 13F/A-1 MERCK COM 58933Y105 630,189 -35,199 -5.29 64,878 -15.50 0.5991
2023-10-11 2023-09-30 13F MERCK COM 58933Y105 950,795 -59,909 97,884 0.5460
2024-06-04 2023-06-30 13F/A-1 MERCK COM 58933Y105 665,388 -25,468 -3.69 76,779 4.46 0.6736
2023-07-24 2023-06-30 13F MERCK COM 58933Y105 1,010,704 319,848 116,625 0.6186
2024-06-04 2023-03-31 13F/A-1 MERCK COM 58933Y105 690,856 -20,792 -2.92 73,500 -7.02 0.6839
2023-04-12 2023-03-31 13F MERCK COM 58933Y105 1,045,628 333,980 111,244 0.6328
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 711,648 -12,431 -1.72 79,050 26.01 0.7978
2022-11-04 2022-09-30 13F MERCK COM 58933Y105 724,079 98,131 15.68 62,733 8.33 0.7325
2022-07-27 2022-06-30 13F MERCK COM 58933Y105 625,948 36,253 6.15 57,907 19.17 0.6260
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 589,695 22,236 3.92 48,591 11.00 0.4200
2022-02-14 2021-12-31 13F/A-1 MERCK COM 58933Y105 567,459 -42,882 -7.03 43,774 -4.51 0.3638
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 610,341 0 45,842 0.1740
2021-10-29 2021-09-30 13F MERCK COM 58933Y105 610,341 -15,980 -2.55 45,842 -5.20 0.4044
2021-08-06 2021-06-30 13F MERCK COM 58933Y105 626,321 31,336 5.27 48,359 5.43 0.4178
2021-05-11 2021-03-31 13F MERCK & CO. COM 58933Y105 594,985 9,673 1.65 45,868 4.43 0.3400
2021-02-12 2020-12-31 13F/A-1 MERCK & CO. COM 58933Y105 585,312 585,312 43,922 0.2879
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 585,312 43,922 0.2879
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
(%)
2026-05-08 2026-03-31 13F MERCK COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-13 2025-12-31 13F MERCK COM Call 7,000 737 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.