Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionLaFleur & Godfrey LLC
Latest Disclosed Ownership88,152 shares
Latest Disclosed Value $ 10,603,819
LaFleur & Godfrey LLC ownership in MRK / Merck & Co., Inc.

On May 4, 2026 - LaFleur & Godfrey LLC filed a 13F-HR form disclosing ownership of 88,152 shares of Merck & Co., Inc. (MX:MRK) valued at $10,603,819 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 92,201 shares of Merck & Co., Inc.. This represents a change in shares of -4.39% during the quarter.

LaFleur & Godfrey LLC has a history of taking positions in derivatives of the underlying security (MRK) 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.

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)
2026-05-04 2026-03-31 13F MERCK COM 58933Y105 88,152 -4,049 -4.39 10,604 9.25 1.3201
2026-02-03 2025-12-31 13F MERCK COM 58933Y105 92,201 -1,117 -1.20 9,705 23.91 1.1752
2025-11-10 2025-09-30 13F MERCK COM 58933Y105 93,318 -3,656 -3.77 7,832 2.03 0.9497
2025-07-14 2025-06-30 13F MERCK COM 58933Y105 96,974 -5,008 -4.91 7,676 -16.14 0.9587
2025-04-23 2025-03-31 13F MERCK COM 58933Y105 101,982 -691 -0.67 9,154 -10.38 1.2419
2025-02-06 2024-12-31 13F/A-1 MERCK COM 58933Y105 102,673 -410 -0.40 10,214 -12.75 1.4001
2025-01-16 2024-12-31 13F MERCK COM 58933Y105 102,673 -410 10,214 1.4001
2024-10-16 2024-09-30 13F MERCK COM 58933Y105 103,083 -2,330 -2.21 11,706 -10.30 1.6143
2024-07-23 2024-06-30 13F MERCK COM 58933Y105 105,413 -1,186 -1.11 13,050 -7.22 1.9149
2024-04-23 2024-03-31 13F MERCK COM 58933Y105 106,599 -6,668 -5.89 14,066 13.91 2.0822
2024-01-18 2023-12-31 13F MERCK COM 58933Y105 113,267 -562 -0.49 12,348 5.38 1.8411
2023-10-18 2023-09-30 13F MERCK COM 58933Y105 113,829 -625 -0.55 11,719 -11.27 1.8762
2023-07-20 2023-06-30 13F MERCK COM 58933Y105 114,454 -660 -0.57 13,207 7.84 1.9781
2023-04-18 2023-03-31 13F MERCK COM 58933Y105 115,114 -5,906 -4.88 12,247 -8.80 2.0072
2023-01-12 2022-12-31 13F MERCK COM 58933Y105 121,020 -20,150 -14.27 13,427 10.44 2.2393
2022-10-17 2022-09-30 13F MERCK COM 58933Y105 141,170 -11,323 -7.43 12,158 -12.55 2.1676
2022-07-26 2022-06-30 13F MERCK COM 58933Y105 152,493 -6,620 -4.16 13,903 6.50 2.2005
2022-05-03 2022-03-31 13F MERCK COM 58933Y105 159,113 2,238 1.43 13,055 8.58 1.7538
2022-01-26 2021-12-31 13F MERCK COM 58933Y105 156,875 5,148 3.39 12,023 5.50 1.5416
2021-11-01 2021-09-30 13F MERCK COM 58933Y105 151,727 -1,597 -1.04 11,396 -4.41 1.5739
2021-07-19 2021-06-30 13F MERCK COM 58933Y105 153,324 31,189 25.54 11,922 26.63 1.7061
2021-04-30 2021-03-31 13F MERCK & CO. COM 58933Y105 122,135 -30,590 -20.03 9,415 -24.64 1.8324
2021-01-26 2020-12-31 13F MERCK & CO. COM 58933Y105 152,725 -2,144 -1.38 12,493 -2.75 2.5576
2020-11-04 2020-09-30 13F MERCK & CO. COM 58933Y105 154,869 -5,518 -3.44 12,846 3.57 2.8985
2020-07-28 2020-06-30 13F MERCK & CO. COM 58933Y105 160,387 -1,048 -0.65 12,403 -0.14 3.1668
2020-05-04 2020-03-31 13F MERCK & CO. COM 58933Y105 161,435 -4,209 -2.54 12,421 -17.55 3.7022
2020-02-04 2019-12-31 13F MERCK COM 58933Y105 165,644 -1,975 -1.18 15,065 6.78 3.4011
2019-10-29 2019-09-30 13F MERCK COM 58933Y105 167,619 -2,548 -1.50 14,109 -1.11 3.4577
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 170,167 -309 -0.18 14,268 0.63 3.5588
2019-04-17 2019-03-31 13F MERCK COM 58933Y105 170,476 -7,389 -4.15 14,178 4.32 3.6600
2019-02-12 2018-12-31 13F MERCK COM 58933Y105 177,865 -32,949 -15.63 13,591 -9.12 3.8323
2018-12-13 2018-09-30 13F MERCK COM 58933Y105 210,814 -3,063 -1.43 14,955 15.20 3.6033
2018-12-13 2018-06-30 13F MERCK COM 58933Y105 213,877 -4,408 -2.02 12,982 9.18 3.2440
2018-12-13 2018-03-31 13F MERCK COM 58933Y105 218,285 -12,075 -5.24 11,890 -8.27 2.9818
2018-01-22 2017-12-31 13F MERCK COM 58933Y105 230,360 -11,540 -4.77 12,962 -16.31 3.1838
2017-10-26 2017-09-30 13F MERCK COM 58933Y105 241,900 -1,505 -0.62 15,489 -0.71 4.0576
2017-08-02 2017-06-30 13F MERCK COM 58933Y105 243,405 3,400 1.42 15,600 2.30 4.1044
2017-04-28 2017-03-31 13F MERCK COM 58933Y105 240,005 -1,055 -0.44 15,250 7.46 4.1162
2017-01-25 2016-12-31 13F/A-1 MERCK COM 58933Y105 241,060 11,640 5.07 14,191 -0.89 3.9766
2016-10-20 2016-09-30 13F MERCK COM 58933Y105 229,420 11,440 5.25 14,318 14.01 4.1288
2016-08-10 2016-06-30 13F MERCK COM 58933Y105 217,980 23,100 11.85 12,558 21.79 3.7175
2016-04-27 2016-03-31 13F MERCK COM 58933Y105 194,880 64,890 49.92 10,311 50.17 3.1335
2016-02-02 2015-12-31 13F MERCK COM 58933Y105 129,990 17,360 15.41 6,866 23.42 2.0345
2015-10-23 2015-09-30 13F MERCK COM 58933Y105 112,630 112,630 5,563 1.6626
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
(%)
2017-04-28 2017-03-31 13F MERCK COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2017-01-24 2016-12-31 13F MERCK COM Put 241,060 14,191 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.