Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionLavaca Capital Llc
Latest Disclosed Ownership14,014 shares
Latest Disclosed Value $ 1,685,744
Lavaca Capital Llc ownership in 6MK / Merck & Co., Inc.

On May 13, 2026 - Lavaca Capital Llc filed a 13F-HR form disclosing ownership of 14,014 shares of Merck & Co., Inc. (BG:6MK) valued at $1,685,744 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 10,834 shares of Merck & Co., Inc.. This represents a change in shares of 29.35% during the quarter.

Lavaca Capital Llc has a history of taking positions in derivatives of the underlying security (6MK) in the form of stock options.

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.

BG:6MK / 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)
2026-05-13 2026-03-31 13F MERCK COM 58933Y105 14,014 3,180 29.35 1,686 47.81 0.2987
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 10,834 0 0.00 1,140 25.41 0.1843
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 10,834 0 0.00 909 6.07 0.1568
2025-08-28 2025-06-30 13F/A-1 MERCK COM 58933Y105 10,834 0 0.00 858 -11.83 0.3190
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 173 -10,661 97 0.0362
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 10,834 -391 -3.48 972 -12.90 0.4014
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 11,225 391 3.61 1,117 -9.27 0.4385
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 10,834 100 0.93 1,230 -7.38 0.5236
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 10,734 0 0.00 1,329 -6.21 0.6824
2024-05-15 2024-03-31 13F/A-1 MERCK COM 58933Y105 10,734 1,834 20.61 1,416 45.98 0.8267
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 10,734 1,416
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 8,900 -2,422 -21.39 970 -16.74 0.5505
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 11,322 -10,592 -48.33 1,166 -53.92 0.3918
2023-08-28 2023-06-30 13F/A-1 MERCK COM 58933Y105 21,914 -42,832 -66.15 2,529 -63.60 0.7404
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 64,746 727 1.14 6,945 5.79 1.4521
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 64,019 1,956 3.15 6,565 18.89 2.0500
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 62,063 -1,029 -1.63 5,522 -1.66 1.9841
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 63,092 6,706 11.89 5,615 21.38 0.8356
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 56,386 -48,696 -46.34 4,626 -42.56 0.4987
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 105,082 6 0.01 8,053 2.04 1.0338
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 105,076 1,710 1.65 7,892 -1.83 0.7972
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 103,366 -16,467 -13.74 8,039 -12.98 0.8006
2021-05-14 2021-03-31 13F MERCK & CO. COM 58933Y105 119,833 8,269 7.41 9,238 1.23 0.7862
2021-01-13 2020-12-31 13F MERCK & CO. COM 58933Y105 111,564 22,112 24.72 9,126 22.99 1.1957
2020-11-10 2020-09-30 13F MERCK & CO. COM 58933Y105 89,452 -2,390 -2.60 7,420 4.48 1.1669
2020-08-11 2020-06-30 13F MERCK & CO. COM 58933Y105 91,842 -797 -0.86 7,102 -0.36 2.2603
2020-05-12 2020-03-31 13F MERCK & CO. COM 58933Y105 92,639 -4,692 -4.82 7,128 -19.48 6.8968
2020-02-05 2019-12-31 13F MERCK COM 58933Y105 97,331 17 0.02 8,852 8.06 6.8032
2019-11-04 2019-09-30 13F MERCK COM 58933Y105 97,314 -393 -0.40 8,192 -0.01 6.1799
2019-07-29 2019-06-30 13F MERCK COM 58933Y105 97,707 2,169 2.27 8,193 3.11 6.3154
2019-04-11 2019-03-31 13F MERCK COM 58933Y105 95,538 5,000 5.52 7,946 14.86 6.7714
2019-01-22 2018-12-31 13F MERCK COM 58933Y105 90,538 90,538 6,918 6.8876
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
(%)
2023-08-25 2023-06-30 13F/A MERCK COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-08-15 2023-06-30 13F MERCK COM Put 0 0 n/a n/a n/a
2023-05-15 2023-03-31 13F MERCK COM Put 24,100 0.00 2,589 6.15 n/a n/a n/a
2023-02-14 2022-12-31 13F MERCK COM Put 24,100 0.00 2,439 17.49 n/a n/a n/a
2022-11-14 2022-09-30 13F MERCK COM Put 24,100 0.00 2,075 -5.55 n/a n/a n/a
2022-08-12 2022-06-30 13F MERCK COM Put 24,100 2,197 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.