Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionAnnex Advisory Services, LLC
Latest Disclosed Ownership5,087 shares
Latest Disclosed Value $ 611,930
Annex Advisory Services, LLC reports 3.14% decrease in ownership of MRK / Merck & Co., Inc.

On April 16, 2026 - Annex Advisory Services, LLC filed a 13F-HR form disclosing ownership of 5,087 shares of Merck & Co., Inc. (MX:MRK) valued at $611,930 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 5,252 shares of Merck & Co., Inc.. This represents a change in shares of -3.14% during the quarter.

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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-16 2026-03-31 13F MERCK COM 58933Y105 5,087 -165 -3.14 612 10.69 0.0115
2026-01-26 2025-12-31 13F MERCK COM 58933Y105 5,252 -1,448 -21.61 553 -1.78 0.0106
2025-10-17 2025-09-30 13F MERCK COM 58933Y105 6,700 -4,429 -39.80 562 -36.14 0.0120
2025-07-11 2025-06-30 13F MERCK COM 58933Y105 11,129 -266,571 -95.99 881 -96.47 0.0212
2025-04-11 2025-03-31 13F MERCK COM 58933Y105 277,700 67 0.02 24,926 -9.75 0.7068
2025-01-16 2024-12-31 13F MERCK COM 58933Y105 277,633 -30,783 -9.98 27,619 -21.14 0.8322
2024-10-10 2024-09-30 13F MERCK COM 58933Y105 308,416 39,631 14.74 35,024 5.25 1.1205
2024-07-12 2024-06-30 13F MERCK COM 58933Y105 268,785 24,999 10.25 33,276 3.44 1.1719
2024-04-12 2024-03-31 13F MERCK COM 58933Y105 243,786 25,430 11.65 32,168 35.13 1.1424
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 218,356 35,717 19.56 23,805 26.61 0.9936
2023-11-01 2023-09-30 13F MERCK COM 58933Y105 182,639 31,789 21.07 18,803 8.02 1.1377
2023-07-24 2023-06-30 13F MERCK COM 58933Y105 150,850 2,078 1.40 17,407 9.98 0.9661
2023-04-27 2023-03-31 13F MERCK COM 58933Y105 148,772 6,412 4.50 15,828 0.21 0.8483
2023-01-30 2022-12-31 13F MERCK COM 58933Y105 142,360 3,770 2.72 15,795 32.33 0.8898
2022-10-24 2022-09-30 13F MERCK COM 58933Y105 138,590 3,990 2.96 11,935 -2.75 0.8045
2022-07-27 2022-06-30 13F MERCK COM 58933Y105 134,600 27,146 25.26 12,272 39.19 0.8862
2022-04-13 2022-03-31 13F MERCK & CO. COM 58933Y105 107,454 23,962 28.70 8,817 37.79 0.6450
2022-01-31 2021-12-31 13F MERCK COM 58933Y105 83,492 19,931 31.36 6,399 34.15 0.4386
2021-10-18 2021-09-30 13F MERCK COM 58933Y105 63,561 10,235 19.19 4,770 15.22 0.3902
2021-07-29 2021-06-30 13F MERCK COM 58933Y105 53,326 5,023 10.40 4,140 11.20 0.3356
2021-04-22 2021-03-31 13F MERCK & CO. COM 58933Y105 48,303 3,720 8.34 3,723 2.08 0.3584
2021-01-28 2020-12-31 13F MERCK & CO. COM 58933Y105 44,583 3,609 8.81 3,647 7.30 0.3571
2020-10-23 2020-09-30 13F MERCK & CO. COM 58933Y105 40,974 -630 -1.51 3,399 5.66 0.4333
2020-07-21 2020-06-30 13F MERCK & CO. COM 58933Y105 41,604 37,513 916.96 3,217 924.52 0.4485
2020-04-22 2020-03-31 13F MERCK & CO. COM 58933Y105 4,091 70 1.74 314 -14.21 0.0445
2020-02-13 2019-12-31 13F/A-1 MERCK COM 58933Y105 4,021 386 10.62 366 19.61 0.0443
2020-02-10 2019-12-31 13F MERCK COM 58933Y105 4,021 386 366 26,070.7343
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 3,635 568 18.52 306 19.07 0.0411
2019-07-18 2019-06-30 13F MERCK COM 58933Y105 3,067 150 5.14 257 5.76 0.0362
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 2,917 -195 -6.27 243 2.10 0.0364
2019-02-12 2018-12-31 13F MERCK COM 58933Y105 3,112 100 3.32 238 11.21 0.0375
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 3,012 -799 -20.97 214 -7.36 0.0331
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 3,811 3,811 231 0.0394
2017-08-04 2017-06-30 13F MERCK COM 58933Y105 0 -6,256 -100.00 0 -100.00
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 6,256 -8,681 -58.12 397 -54.84 0.0986
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 14,937 2,623 21.30 879 14.30 0.2134
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 12,314 233 1.93 769 10.49 0.2000
2016-08-11 2016-06-30 13F MERCK COM 58933Y105 12,081 43 0.36 696 9.26 0.1886
2016-05-02 2016-03-31 13F MERCK & CO INC COM 58933Y105 12,038 -596 -4.72 637 -4.50 0.1807
2016-02-01 2015-12-31 13F MERCK & CO INC COM 58933Y105 12,634 981 8.42 667 15.80 0.1954
2015-11-16 2015-09-30 13F MERCK & CO INC COM 58933Y105 11,653 2,629 29.13 576 12.06 0.1873
2015-08-12 2015-06-30 13F MERCK & CO INC COM 58933Y105 9,024 2,205 32.34 514 31.12 0.1647
2015-05-12 2015-03-31 13F MERCK & CO INC COM 58933Y105 6,819 2,051 43.02 392 44.65 0.1261
2015-02-06 2014-12-31 13F MERCK & CO INC COM 58933Y105 4,768 4,768 271 0.0845
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.