Merck & Co., Inc.
US ˙ NYSE ˙ US58933Y1055

SecurityMRK / Merck & Co., Inc.
InstitutionLevel Four Advisory Services, Llc
Latest Disclosed Ownership74,875 shares
Latest Disclosed Value $ 9,005,835
Level Four Advisory Services, Llc reports 7.97% decrease in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Level Four Advisory Services, Llc filed a 13F-HR form disclosing ownership of 74,875 shares of Merck & Co., Inc. (US:MRK) valued at $9,006,714 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 81,357 shares of Merck & Co., Inc.. This represents a change in shares of -7.97% during the quarter. The current value of the position is $8,588,162 USD.

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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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 COM 58933Y105 74,875 -6,482 -7.97 9,006 5.16 0.2956
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 81,357 3,026 3.86 8,564 30.26 0.2802
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 78,331 5,321 7.29 6,574 13.76 0.2251
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 73,010 -3,758 -4.90 5,780 -16.12 0.2130
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 76,768 -2,654 -3.34 6,891 -12.78 0.2834
2025-02-12 2024-12-31 13F MERCK COM 58933Y105 79,422 -214 -0.27 7,901 -3.04 0.3229
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 79,636 -13,540 -14.53 8,148 -29.36 0.3430
2024-08-09 2024-06-30 13F MERCK COM 58933Y105 93,176 14,690 18.72 11,535 34.82 0.5200
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 78,486 90 0.11 8,557 0.12 0.4701
2024-02-08 2023-12-31 13F MERCK COM 58933Y105 78,396 -4,101 -4.97 8,547 0.62 0.4795
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 82,497 -6,784 -7.60 8,493 -17.56 0.5476
2023-07-10 2023-06-30 13F MERCK COM 58933Y105 89,281 -5,364 -5.67 10,302 2.31 0.6190
2023-06-05 2023-03-31 13F MERCK COM 58933Y105 94,645 4,025 4.44 10,069 0.15 0.6605
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 90,620 30,399 50.48 10,054 93.87 0.7463
2022-11-07 2022-09-30 13F MERCK COM 58933Y105 60,221 -4,647 -7.16 5,186 -12.31 0.5040
2022-08-08 2022-06-30 13F MERCK COM 58933Y105 64,868 383 0.59 5,914 11.77 0.5578
2022-05-10 2022-03-31 13F MERCK COM 58933Y105 64,485 8,508 15.20 5,291 23.33 0.4145
2022-02-11 2021-12-31 13F MERCK COM 58933Y105 55,977 14,771 35.85 4,290 38.61 0.3271
2021-10-12 2021-09-30 13F MERCK COM 58933Y105 41,206 -3,772 -8.39 3,095 -11.52 0.3219
2021-08-09 2021-06-30 13F MERCK COM 58933Y105 44,978 6,587 17.16 3,498 18.18 0.2419
2021-05-10 2021-03-31 13F MERCK & CO. COM 58933Y105 38,391 -10,480 -21.44 2,960 -25.96 0.2299
2021-02-10 2020-12-31 13F MERCK & CO. COM 58933Y105 48,871 -538 -1.09 3,998 -2.44 0.3209
2020-11-02 2020-09-30 13F MERCK & CO. COM 58933Y105 49,409 -33,365 -40.31 4,098 -36.07 0.3157
2020-08-17 2020-06-30 13F/A-1 MERCK & CO. COM 58933Y105 82,774 43,646 111.55 6,410 112.82 0.4959
2020-05-13 2020-03-31 13F MERCK & CO. COM 58933Y105 39,128 916 2.40 3,012 -73.42 0.3613
2020-02-13 2019-12-31 13F MERCK COM 58933Y105 38,212 2,066 5.72 11,331 272.49 0.4486
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 36,146 -2,688 -6.92 3,042 -6.57 0.3148
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 38,834 2,874 7.99 3,256 8.86 0.3287
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 35,960 453 1.28 2,991 10.25 0.3294
2019-02-07 2018-12-31 13F MERCK COM 58933Y105 35,507 3,923 12.42 2,713 21.06 0.3383
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 31,584 -4,371 -12.16 2,241 2.70 0.2422
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 35,955 -2,092 -5.50 2,182 5.31 0.1589
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 38,047 4,333 12.85 2,072 9.23 0.1607
2018-02-13 2017-12-31 13F MERCK COM 58933Y105 33,714 3,765 12.57 1,897 -1.09 0.1476
2018-04-03 2017-09-30 13F/A-1 MERCK COM 58933Y105 29,949 2,398 8.70 1,918 9.54 0.1700
2017-11-15 2017-09-30 13F MERCK COM 58933Y105 30,828 3,277 1,980
2017-09-20 2017-06-30 13F/A-1 MERCK COM 58933Y105 27,551 -10,344 -27.30 1,751 -27.31 0.2696
2017-07-12 2017-06-30 13F MERCK COM 58933Y105 27,551 1,751
2017-09-20 2017-03-31 13F/A-1 MERCK COM 58933Y105 37,895 3,726 10.90 2,409 19.73 0.2454
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 37,895 3,726 2,409
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 34,169 34,169 2,012 0.2568
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.